AI-generatedRishiri Island at a glance
- Best time
- Aug
- Warmest month
- Aug · 20°
- Warmest sea
- Aug · 20.3°
- Sunshine a year
- 1,550 h
- Rain a year
- 1,259 mm
- Climate
- Continental
- Time zone
- UTC+9
- Elevation
- 355 m
Climate in Rishiri Island
Rishiri Island has mild to warm summers and cold winters with occasional snow. August is the warmest month with average highs of 20 °C, while January is the coolest at −3 °C. With around 1,550 hours of sunshine a year, Rishiri Island is rather dull; May is the sunniest month with 6.1 hours a day.
Holiday weather through the year
Best time to visit Rishiri Island
The best time to visit Rishiri Island is in August. The sea stays too cool for a classic beach holiday: even in August it only reaches 20.3 °C. For sightseeing, day trips and hiking, conditions are most comfortable from July to August. Rain is frequent from September to March; the wettest month is November with 153 mm.
Rishiri Island through the seasons
How the weather changes over the seasons, with averages for each.
Rishiri Island in spring
Mar – May
Poor
- 0–9 °C by day
- Sea 7 °C
- 5.4 h of sun a day
- 34 rainy days in all
Rishiri Island in summer
Jun – Aug
Poor
- 13–20 °C by day
- Sea 17 °C
- 5.1 h of sun a day
- 30 rainy days in all
Rishiri Island in autumn
Sep – Nov
Poor
- 5–18 °C by day
- Sea 16 °C
- 4.2 h of sun a day
- 48 rainy days in all
Rishiri Island in winter
Dec – Feb
Poor
- −3–−1 °C by day
- Sea 6 °C
- 2.2 h of sun a day
- 66 rainy days in all
Which month for what?
Beach & swimming
No month
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
Jul – Aug
15–28 °C and not too much rain
Rainy months
Sep – Mar
Rainy season or more than 12 rainy days
Snow
Nov – Apr
Snow on 2 or more days
Find your perfect month
Tell us what you like and we rate every month in Rishiri Island for you.
Your best months: August – September
Based on the climate averages; tap a month to see its details.
Weather in October
Weather in October
Holiday weather in October
Poor
Best time to visit: August
Where to go in OctoberSea temperature in October
Keep in mindFrequent rain
A typical day in October
- Morning, 08:00: about 10°
- Midday, 13:00: about 12°
- Afternoon, 16:00: about 12°
- Evening, 20:00: about 10°
- Night, 23:00: about 9°
05:4916:52
Cold evenings: bring a warm jacket.
Estimated from the average high and low: coolest around sunrise, warmest in mid-afternoon.
Light for photos in October
- Golden hour
- Morning 05:31–06:29 · evening 16:12–17:10
- Blue hour
- Morning 05:20–05:31 · evening 17:10–17:22
Golden hour: the sun between 4° below and 6° above the horizon; blue hour: 6° to 4° below it. Times for the 15th of the month; mountains and clouds shift the light.
October in Rishiri Island compared with home
Loading the climate at home …
Early or late October?
In October, daytime highs fall from about 15° at the start of the month to 9° at the end. The sea cools from 18° to 14°. The days get 1.5 h shorter.
| October | 1 Oct | 31 Oct |
|---|---|---|
| Daytime high | 15° | 9° |
| Night-time low | 11° | 4° |
| Sea | 18° | 14° |
| Daylight | 11.8 h | 10.3 h |
What is the weather like in Rishiri Island in October?
In October, Rishiri Island is cool: daytime highs average 13 °C, and nights cool down to about 8 °C. The sea averages 16.4 °C – swimming is only for the hardy. Expect around 4.3 hours of sunshine a day. It rains often – on about 16 days, adding up to 128 mm. It is often windy: on a typical day the wind peaks at around 39 km/h. All in all, October is not an ideal month for a holiday in Rishiri Island.
More details for October
- Daylight
- 11 h 3 min05:49 – 16:52
- UV index
- 3 · moderateclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 39 km/haverage daily peakAll months
- Cloud cover
- 55 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC+9offset from UTC
How the score comes together
- Temperatureweight 35 %0 %
- Seaweight 25 %0 %
- Sunshineweight 20 %22 %
- Few rainy daysweight 20 %16 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in October
- Sunscreen
- A jumper for the evenings
- Rain jacket or umbrella
- Windproof jacket
Compare two months in Rishiri Island
Pick two months to see how the weather differs. A tick marks the clearly better value; for temperatures it depends on your plans.
August has the better holiday weather in Rishiri Island: score 35 against 8. In August, days are 7 °C warmer than in October. The sea is 4 °C warmer in August. August has 5 fewer rainy days. The sun shines an hour longer a day in August.
| Month | October | August |
|---|---|---|
| Holiday weather score | 8 | 35better |
| Daytime high | 13° | 20° |
| Night-time low | 8° | 17° |
| Sea | 16.4° | 20.3° |
| Sunshine | 4.3 h | 5.2 hbetter |
| Rainy days | 16 | 11better |
| Rainfall | 128 mm | 133 mm |
| Muggy days | 0better | 13 |
Based on the climate averages 1996–2025.
Rishiri Island month by month
The typical weather for every month at a glance.
0January−3° · Sea 6° · 1.9 h
In January, Rishiri Island is bitterly cold: daytime highs average −3 °C, and nights often drop below freezing (−7 °C). The sea averages 5.6 °C – swimming is only for the hardy. The sun is scarce, with only about 1.9 hours a day. Precipitation falls on about 24 days, totalling 118 mm; on about 23 of them it snows. It is often windy: on a typical day the wind peaks at around 39 km/h. All in all, January is not an ideal month for a holiday in Rishiri Island.
Rishiri Island in January0February−3° · Sea 5° · 3.0 h
In February, Rishiri Island is bitterly cold: daytime highs average −3 °C, and nights often drop below freezing (−7 °C). The sea averages 4.6 °C – swimming is only for the hardy. The sun is scarce, with only about 3.0 hours a day. Precipitation falls on about 18 days, totalling 83 mm; on about 18 of them it snows. It is often windy: on a typical day the wind peaks at around 38 km/h. All in all, February is not an ideal month for a holiday in Rishiri Island.
Rishiri Island in February10March0° · Sea 5° · 4.5 h
In March, Rishiri Island is bitterly cold: daytime highs average 0 °C, and nights often drop below freezing (−3 °C). The sea averages 4.9 °C – swimming is only for the hardy. Expect around 4.5 hours of sunshine a day. Precipitation falls on about 14 days, totalling 69 mm; on about 11 of them it snows. It is often windy: on a typical day the wind peaks at around 38 km/h. All in all, March is not an ideal month for a holiday in Rishiri Island.
Rishiri Island in March21April5° · Sea 6° · 5.7 h
In April, Rishiri Island is cold: daytime highs average 5 °C, and nights cool down to about 2 °C. The sea averages 6.2 °C – swimming is only for the hardy. Expect around 5.7 hours of sunshine a day. Rain is frequent, with about 9 rainy days and 59 mm in total. Snow falls on about 3 days. It is often windy: on a typical day the wind peaks at around 35 km/h. All in all, April is not an ideal month for a holiday in Rishiri Island.
Rishiri Island in April21May9° · Sea 9° · 6.1 h
In May, Rishiri Island is cold: daytime highs average 9 °C, and nights cool down to about 5 °C. The sea averages 8.8 °C – swimming is only for the hardy. Expect around 6.1 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 75 mm in total. It is often windy: on a typical day the wind peaks at around 32 km/h. All in all, May is not an ideal month for a holiday in Rishiri Island.
Rishiri Island in May21June13° · Sea 13° · 5.4 h
In June, Rishiri Island is cool: daytime highs average 13 °C, and nights cool down to about 10 °C. The sea averages 12.7 °C – swimming is only for the hardy. Expect around 5.4 hours of sunshine a day. Rain falls on about 9 days, adding up to 68 mm. It is often windy: on a typical day the wind peaks at around 29 km/h. All in all, June is not an ideal month for a holiday in Rishiri Island.
Rishiri Island in June18July17° · Sea 17° · 4.8 h
In July, Rishiri Island is mild: daytime highs average 17 °C, and nights cool down to about 14 °C. The sea averages 17.1 °C – bracing, so a wetsuit helps for longer swims. Expect around 4.8 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 104 mm in total. All in all, July is not an ideal month for a holiday in Rishiri Island.
Rishiri Island in July35August20° · Sea 20° · 5.2 h
In August, Rishiri Island is mild: daytime highs average 20 °C, and nights cool down to about 17 °C. The sea averages 20.3 °C – refreshing for a swim. Expect around 5.2 hours of sunshine a day. Rain is frequent, with about 11 rainy days and 133 mm in total. It is often windy: on a typical day the wind peaks at around 28 km/h. All in all, August is not an ideal month for a holiday in Rishiri Island – and yet one of the best months here.
Rishiri Island in August29September18° · Sea 20° · 5.9 h
In September, Rishiri Island is mild: daytime highs average 18 °C, and nights cool down to about 14 °C. The sea averages 20.1 °C – refreshing for a swim. Expect around 5.9 hours of sunshine a day. Rain is frequent, with about 12 rainy days and 123 mm in total. It is often windy: on a typical day the wind peaks at around 33 km/h. All in all, September is not an ideal month for a holiday in Rishiri Island.
Rishiri Island in September8October13° · Sea 16° · 4.3 h
In October, Rishiri Island is cool: daytime highs average 13 °C, and nights cool down to about 8 °C. The sea averages 16.4 °C – swimming is only for the hardy. Expect around 4.3 hours of sunshine a day. It rains often – on about 16 days, adding up to 128 mm. It is often windy: on a typical day the wind peaks at around 39 km/h. All in all, October is not an ideal month for a holiday in Rishiri Island.
Rishiri Island in October0November5° · Sea 12° · 2.4 h
In November, Rishiri Island is cold: daytime highs average 5 °C, and nights cool down to about 1 °C. The sea averages 11.8 °C – swimming is only for the hardy. The sun is scarce, with only about 2.4 hours a day. It rains often – on about 20 days, adding up to 153 mm. Snow falls on about 8 days. It is often windy: on a typical day the wind peaks at around 42 km/h. All in all, November is not an ideal month for a holiday in Rishiri Island.
Rishiri Island in November0December−1° · Sea 8° · 1.8 h
In December, Rishiri Island is bitterly cold: daytime highs average −1 °C, and nights often drop below freezing (−5 °C). The sea averages 8.4 °C – swimming is only for the hardy. The sun is scarce, with only about 1.8 hours a day. Precipitation falls on about 24 days, totalling 147 mm; on about 21 of them it snows. It is often windy: on a typical day the wind peaks at around 42 km/h. All in all, December is not an ideal month for a holiday in Rishiri Island.
Rishiri Island in DecemberClimate in detail
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Nights and sleep in Rishiri Island
How warm the nights get in each month, from the mean night-time low. Tap a month for details.
- Frost below 0°
- Cold 0–8°
- Cool 8–15°
- Pleasant 15–20°
CoolOctober: nights around 8°. A duvet at night and a jumper for the evening.
The coolest nights are in January (−7°), the warmest in August (17°). Nights are pleasant for sleeping (15 to 20 °C) in August. Nights fall below 8 °C on average from November to May, so the room should be heated.
Temperatures through the year
Average daytime high, night-time low and sea temperature per month.
| Month | Score | Day | Night | Sea | Sun | Rain days | Rain mm |
|---|---|---|---|---|---|---|---|
| JanuaryJan | 0 | −3° | −7° | 5.6° | 1.9 h | 24 | 118 |
| FebruaryFeb | 0 | −3° | −7° | 4.6° | 3.0 h | 18 | 83 |
| MarchMar | 10 | 0° | −3° | 4.9° | 4.5 h | 14 | 69 |
| AprilApr | 21 | 5° | 2° | 6.2° | 5.7 h | 9 | 59 |
| MayMay | 21 | 9° | 5° | 8.8° | 6.1 h | 10 | 75 |
| JuneJun | 21 | 13° | 10° | 12.7° | 5.4 h | 9 | 68 |
| JulyJul | 18 | 17° | 14° | 17.1° | 4.8 h | 10 | 104 |
| AugustAug | 35 | 20° | 17° | 20.3° | 5.2 h | 11 | 133 |
| SeptemberSep | 29 | 18° | 14° | 20.1° | 5.9 h | 12 | 123 |
| OctoberOct | 8 | 13° | 8° | 16.4° | 4.3 h | 16 | 128 |
| NovemberNov | 0 | 5° | 1° | 11.8° | 2.4 h | 20 | 153 |
| DecemberDec | 0 | −1° | −5° | 8.4° | 1.8 h | 24 | 147 |
Climate averages 1996–2025 (sunshine partly WMO station normals 1991–2020), not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences
45.16° N, 141.20° E · 355 m · Asia/Tokyo
Sea temperature in Rishiri Island
Monthly sea surface temperature with the range of cooler and warmer years.
8 in 10 years: 15.0 – 17.9 °C
Swimming season: Aug – Sep
- cold
- fresh
- refreshing
- pleasant
- warm
- very warm
The sea temperature in Rishiri Island ranges from 4.6 °C in February to 20.3 °C in August. It is warm enough for a comfortable swim (20 °C and more) from August to September.
From August to April the sea is even warmer than the afternoon air. The sea temperature varies from year to year: in August, eight out of ten years were between 19.0 and 21.4 °C.
| Month | Average | Cool year | Warm year | Feels |
|---|---|---|---|---|
| JanuaryJan | 5.6° | 4.4° | 7.0° | cold |
| FebruaryFeb | 4.6° | 3.5° | 6.3° | cold |
| MarchMar | 4.9° | 3.8° | 6.2° | cold |
| AprilApr | 6.2° | 5.3° | 7.1° | cold |
| MayMay | 8.8° | 7.8° | 9.5° | cold |
| JuneJun | 12.7° | 11.8° | 13.5° | cold |
| JulyJul | 17.1° | 15.6° | 18.8° | fresh |
| AugustAug | 20.3° | 19.0° | 21.4° | refreshing |
| SeptemberSep | 20.1° | 19.0° | 21.8° | refreshing |
| OctoberOct | 16.4° | 15.0° | 17.9° | cold |
| NovemberNov | 11.8° | 10.4° | 12.9° | cold |
| DecemberDec | 8.4° | 6.7° | 10.1° | cold |
Sunshine hours in Rishiri Island
Average hours of bright sunshine per day, next to the length of the day. Tap a month to select it.
In October, the sun shines for about 4.3 of 11.0 hours of daylight in Rishiri Island, 39 % of the daylight hours.
Sunshine hours: estimated from radiation data (ERA5, 1996–2025) and calibrated against measured station values; no weather station is close enough here. Daylight is the time from sunrise to sunset on the 15th of the month.
Rain in Rishiri Island: rainy days and rainfall
A rainy day is a day with at least 1 mm of rain or snow; the amount is what falls in the whole month. Tap a month to select it.
In October, Rishiri Island has about 16 rainy days with 128 mm of rain in total.
UV index in Rishiri Island
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 3 · moderateAround midday seek shade; use sunscreen, a hat and sunglasses.
The sun is strongest in June (UV 9).
Minutes until sunburn in October
- Very fair skin
- about 45 min
- Fair skin
- about 55 min
- Light brown skin
- about 75 min
- Olive skin
- about 100 min
Rough guide for unprotected skin at noon under a clear sky; clouds lengthen the time, water, sand and snow shorten it. Sunscreen extends the time only partly.
Monthly values: clear-sky noon estimate from the sun's angle, ozone and altitude. UV today: Open-Meteo forecast.
Wind and clouds in Rishiri Island
How breezy and how cloudy Rishiri Island is through the year. Tap a month to select it on the whole page.
Wind
Typical daily peak of the wind in km/h: what the afternoon breeze usually reaches, not the gusts.
In October, the wind in Rishiri Island typically peaks at 39 km/h during the day: Beaufort 6, strong breeze.
Breezy months for windsurfing and kiting
From Beaufort 4 (20 km/h) the daily breeze is usually enough for windsurfing and often for kiting, and here it is that strong all year.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 55 % of the sky over Rishiri Island: variable cloud, with about 4.3 hours of sunshine a day.
Wind: mean daily maximum of the hourly wind 10 m above ground (ERA5, 1996–2025). Gusts are stronger, and the model grid of about 28 km smooths out local effects such as capes and valley winds. Clouds: mean total cloud cover of all layers over day and night (ERA5, 1996–2025). Thin high cloud counts as cover even when the sun still shines through.
Heat and humidity in Rishiri Island
How often the day gets hot in Rishiri Island (30 °C and more), and in which months heat and humidity come together. Tap a month to select it.
Heat calendar
- pleasant
- some hot or muggy days
- often muggy
- often hot
- hot and muggy
In October, Rishiri Island has about 0 hot days, with an average daytime high of 13 °C: pleasant. Heat plays no part this month.
Hot days reach at least 30 °C; a month counts as muggy when the mean dew point reaches 18 °C on at least 15 days. Averages from ERA5 and ERA5-Land, 1996–2025. Muggy nights through the year
Snow in Rishiri Island
When Rishiri Island is likely to be white: the chance of seeing snow during a week's stay, the days with fresh snow and how much falls. Tap a month to select it.
Snow calendar
- hardly any
- possible
- likely
- very likely
In October, it hardly ever snows in Rishiri Island.
Snow days bring at least 1 cm of fresh snow. Fresh snow comes from ERA5 snowfall (1996–2025) at the height of the place, not on the slopes above it; the snow chance also weighs whether the snow settles. An estimate from climate averages, not a snow report.
Planning a trip to Rishiri Island
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Rishiri Island in the school holidays
How the weather suits the usual holiday periods. Dates vary by school and region, so each holiday uses the months it usually falls in.
Rishiri Island has its best school-holiday weather during the summer holidays (score 29) and its weakest during the Christmas holidays (score 0).
- 18
Easter holidays
Mar – Apr
Poor
- 3 °C by day
- Sea 6 °C
- 5.3 h of sun a day
- 11 rainy days a month
Keep in mind: Frequent rain, Snow
- 21
May half-term
May – Jun
Poor
- 10 °C by day
- Sea 10 °C
- 6.0 h of sun a day
- 10 rainy days a month
- 29
Summer holidays
Jul – Aug
PoorBest holidays
- 19 °C by day
- Sea 19 °C
- 5.1 h of sun a day
- 11 rainy days a month
Good for: Sightseeing & walks
- 8
October half-term
Oct
Poor
- 13 °C by day
- Sea 16 °C
- 4.3 h of sun a day
- 16 rainy days a month
Keep in mind: Frequent rain
- 0
Christmas holidays
Dec – Jan
Poor
- −2 °C by day
- Sea 7 °C
- 1.9 h of sun a day
- 24 rainy days a month
Keep in mind: Frequent rain, Snow
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- about 10 h 55 min
- Distance
- 8,660 km
- Time zone
- UTC+9
- Jet lag
- About 8 days (8 h east)
Rule of thumb for flying east: for a few days before, go to bed and get up a little earlier, and get plenty of morning light at your destination.
Estimated from the straight-line distance: 30 minutes for take-off and landing plus 830 km/h cruising speed.
Compare & alternatives
Rishiri Island compared
Put Rishiri Island side by side with another destination.
Rishiri Island vs Wakkanai
In October the holiday weather in Rishiri Island and Wakkanai is about equally good (score 8 vs 10). During the day Wakkanai is 1 °C warmer than Rishiri Island. The sea is about equally warm.
| in October | Rishiri Island | Wakkanai |
|---|---|---|
| Holiday weather score | 8 | 10 |
| Daytime high | 13° | 14° |
| Sea | 16° | 16° |
| Sunshine | 4 h | 4 h |
| Rainy days | 16 | 14 |
| Best time | Aug | Aug |
Through the year
Japan in October: the best places
In October, Rishiri Island ranks 31 among the 31 nearest destinations in this country.
- Sendai20°70
- 2Fukushima20°70
- 3Hakodate18°19°68
- 4Aomori19°19°68
- 5Morioka18°67
- 6Kanazawa22°22°67
- 7Tomakomai16°17°65
- 8Tsukuba22°65
- 31Rishiri IslandThis page13°16°8
Near Rishiri Island
Other destinations close by.
Places with a climate like Rishiri Island
Destinations whose weather through the year is closest to Rishiri Island's – good alternatives.
Frequently asked questions about Rishiri Island
When is the best time to visit Rishiri Island?
The best time to visit Rishiri Island is in August. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
How warm is the sea in Rishiri Island?
The sea temperature in Rishiri Island ranges from 4.6 °C in February to 20.3 °C in August. It is warm enough for a comfortable swim (20 °C and more) from August to September.
Can you swim in Rishiri Island in October?
Only if you don't mind cold water: in October the sea averages just 16.4 °C. Comfortable swimming is possible from August to September.
What is the warmest month in Rishiri Island?
August is the warmest month, with average highs of 20 °C and nights around 17 °C. January is the coolest month at −3 °C.
When does it rain most in Rishiri Island?
Rain is frequent from September to March; the wettest month is November with 153 mm. The driest month is April with 59 mm.
How many hours of sunshine does Rishiri Island get?
Rishiri Island gets around 1,550 hours of sunshine a year. The sunniest month is May with 6.1 hours a day; in December there are 1.8 hours a day.
What time zone is Rishiri Island in?
Rishiri Island is on UTC+9 all year.
How long is the flight from London to Rishiri Island?
A nonstop flight from London to Rishiri Island takes about 10 h 55 min, for a straight-line distance of about 8,660 km.
Which school holidays are best for Rishiri Island?
Rishiri Island has its best school-holiday weather during the summer holidays (score 29) and its weakest during the Christmas holidays (score 0). Holiday ratings (0–100): Easter holidays 18, May half-term 21, summer holidays 29, October half-term 8, Christmas holidays 0.