AI-generatedNagasaki at a glance
- Best time
- Apr – May, Sep – Nov
- Warmest month
- Aug · 29°
- Warmest sea
- Aug · 27.9°
- Sunshine a year
- 1,860 h
- Rain a year
- 2,156 mm
- Climate
- Temperate
- Time zone
- UTC+9
- Elevation
- 15 m
Climate in Nagasaki
Nagasaki has a temperate climate with warm summers and cool winters. August is the warmest month with average highs of 29 °C, while January is the coolest at 10 °C. With around 1,860 hours of sunshine a year, Nagasaki is moderately sunny; August is the sunniest month with 6.7 hours a day.
Holiday weather through the year
Weather in October
Holiday weather in October
Excellent
Best time to visit: April – May, September – November
October is the peak of the typhoon season
Good forSightseeing & walks
Keep in mindStorm season
A typical day in October
- Morning, 08:00: about 20°
- Midday, 13:00: about 23°
- Afternoon, 16:00: about 22°
- Evening, 20:00: about 21°
- Night, 23:00: about 20°
06:2317:49
Pleasant evenings; a light layer can help.
Estimated from the average high and low: coolest around sunrise, warmest in mid-afternoon.
Light for photos in October
- Golden hour
- Morning 06:08–06:57 · evening 17:16–18:04
- Blue hour
- Morning 05:59–06:08 · evening 18:04–18:14
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.
What is the weather like in Nagasaki in October?
In October, Nagasaki is warm: daytime highs average 23 °C, and nights cool down to about 19 °C. The sea averages 24.4 °C – pleasant for swimming. Expect around 6 hours of sunshine a day. Rain falls on about 8 days, adding up to 114 mm. All in all, October is an excellent month for a holiday in Nagasaki.
More details for October
- Daylight
- 11 h 25 min06:23 – 17:49
- UV index
- 6 · highclear sky, noon (estimate)All months
- Muggy days
- 6 daysdew point 18 °C or moreAll months
- Wind
- 21 km/haverage daily peakAll months
- Cloud cover
- 46 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snow
- Time zone
- UTC+9Asia/Tokyo
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %47 %
- Few rainy daysweight 30 %72 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in October
- Swimwear
- Sunscreen
Sea temperature in Nagasaki
Monthly sea surface temperature with the range of cooler and warmer years.
8 in 10 years: 23.3 – 25.1 °C
Swimming season: Jun – Nov
- cold
- fresh
- refreshing
- pleasant
- warm
- very warm
The sea temperature in Nagasaki ranges from 15.6 °C in February to 27.9 °C in August. It is warm enough for a comfortable swim (20 °C and more) from June to November.
From October to March 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 27.0 and 28.8 °C.
| Month | Average | Cool year | Warm year | Feels |
|---|---|---|---|---|
| JanuaryJan | 16.6° | 15.5° | 17.5° | cold |
| FebruaryFeb | 15.6° | 14.6° | 16.4° | cold |
| MarchMar | 16.0° | 14.9° | 17.1° | cold |
| AprilApr | 17.4° | 16.6° | 18.1° | fresh |
| MayMay | 19.7° | 19.0° | 20.2° | fresh |
| JuneJun | 22.6° | 21.9° | 23.4° | refreshing |
| JulyJul | 25.7° | 24.4° | 27.0° | pleasant |
| AugustAug | 27.9° | 27.0° | 28.8° | warm |
| SeptemberSep | 26.9° | 26.1° | 27.7° | warm |
| OctoberOct | 24.4° | 23.3° | 25.1° | pleasant |
| NovemberNov | 21.5° | 20.8° | 22.5° | refreshing |
| DecemberDec | 18.7° | 17.8° | 19.6° | fresh |
Sunshine hours in Nagasaki
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 5.8 of 11.4 hours of daylight in Nagasaki, 51 % of the day.
Sunshine hours: measured at the weather station 2 km away, averages 1991–2020 (WMO climate normals). Daylight is the time from sunrise to sunset on the 15th of the month.
UV index in Nagasaki
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 6 · highSeek shade around midday; sunscreen SPF 30+, hat and sunglasses.
The sun is strongest in June (UV 11).
Minutes until sunburn in October
- Very fair skin
- about 25 min
- Fair skin
- about 30 min
- Light brown skin
- about 40 min
- Olive skin
- about 50 min
Rough guide for unprotected skin at noon under a clear sky; clouds lengthen it, 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.
Rain in Nagasaki: 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, Nagasaki has about 8 rainy days with 114 mm of rain in total.
Wind and clouds in Nagasaki
How breezy and how cloudy Nagasaki 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 Nagasaki typically peaks at 21 km/h during the day: Beaufort 4, moderate 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: Jul, Sep – Apr.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 46 % of the sky over Nagasaki: variable cloud, with about 5.8 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 Nagasaki
How often the day gets hot in Nagasaki (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, Nagasaki has about 0 hot days, with an average daytime high of 23 °C: some hot or muggy days. Single hot or muggy days are possible; a hat and water bottle are enough.
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
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Nights and sleep in Nagasaki
How warm the nights get in each month, from the mean night-time low. Tap a month for details.
- Cold 0–8°
- Cool 8–15°
- Pleasant 15–20°
- Warm 20–24°
- Hot 24° and more
- muggy month (10+ muggy days)
PleasantOctober: nights around 19°. Ideal for sleeping, often with the window open. Muggy on about 6 days (dew point 18 °C or more).
The coolest nights are in January (7°), the warmest in August (26°). Tropical nights of 20 °C and more are the rule from June to September; then air conditioning or a fan helps you sleep. Nights are pleasant for sleeping (15 to 20 °C) in May and in October. Nights fall below 8 °C on average from January to February, so the room should be heated. It is muggy (dew point 18 °C or more) on about 123 days a year, mostly from June to September.
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 | 26 | 10° | 7° | 16.6° | 3.3 h | 11 | 79 |
| FebruaryFeb | 35 | 11° | 7° | 15.6° | 4.3 h | 11 | 102 |
| MarchMar | 50 | 14° | 9° | 16.0° | 5.1 h | 12 | 145 |
| AprilApr | 71 | 18° | 13° | 17.4° | 5.9 h | 11 | 156 |
| MayMay | 76 | 21° | 17° | 19.7° | 6.1 h | 11 | 210 |
| JuneJun | 58 | 24° | 21° | 22.6° | 4.2 h | 16 | 419 |
| JulyJul | 58 | 28° | 25° | 25.7° | 5.7 h | 17 | 323 |
| AugustAug | 58 | 29° | 26° | 27.9° | 6.7 h | 14 | 214 |
| SeptemberSep | 71 | 27° | 23° | 26.9° | 5.7 h | 13 | 196 |
| OctoberOct | 81 | 23° | 19° | 24.4° | 5.8 h | 8 | 114 |
| NovemberNov | 71 | 18° | 14° | 21.5° | 4.6 h | 9 | 111 |
| DecemberDec | 40 | 12° | 9° | 18.7° | 3.7 h | 11 | 88 |
Climate averages 1996–2025, 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
32.75° N, 129.88° E · 15 m · Asia/Tokyo
Best time to visit Nagasaki
The best time to visit Nagasaki is from April to May and from September to November. The sea stays too cool for a classic beach holiday: even in August it only reaches 27.9 °C. For sightseeing, day trips and hiking, conditions are most comfortable from April to May and from October to November. Rain is most frequent from June to September; the wettest month is June with 419 mm.
Nagasaki through the seasons
How the weather changes over the seasons, with averages for each.
Nagasaki in spring
Mar – May
Good
- 14–21 °C by day
- Sea 18 °C
- 6 h of sun a day
- 34 rainy days in all
Nagasaki in summer
Jun – Aug
Fair
- 24–29 °C by day
- Sea 25 °C
- 6 h of sun a day
- 47 rainy days in all
Nagasaki in autumn
Sep – Nov
Good
- 18–27 °C by day
- Sea 24 °C
- 5 h of sun a day
- 30 rainy days in all
Nagasaki in winter
Dec – Feb
Poor
- 10–12 °C by day
- Sea 17 °C
- 4 h of sun a day
- 32 rainy days in all
Find your perfect month
Tell us what you like and we rate every month in Nagasaki for you.
Your best months: May, October
Based on the climate averages; tap a month to see its details.
Compare two months in Nagasaki
Pick two months to see how the weather differs. A tick marks the clearly better value; for temperatures it depends on your plans.
October has the better holiday weather in Nagasaki: score 81 against 76. In May, days are 2 °C cooler than in October. The sea is 5 °C cooler in May. May has 3 more rainy days.
| Month | October | May |
|---|---|---|
| Weather score | 81better | 76 |
| Day high | 23° | 21° |
| Night low | 19° | 17° |
| Sea | 24.4° | 19.7° |
| Sunshine | 5.8 h | 6.1 h |
| Rainy days | 8better | 11 |
| Rainfall | 114 mmbetter | 210 mm |
| Muggy days | 6 | 5better |
Based on the climate averages 1996–2025.
Which month for what?
Beach & swimming
No month
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
Apr – May, Oct – Nov
15–28 °C and not too much rain
Rainy months
Jun – Sep
12 or more rainy days
Nagasaki month by month
The typical weather for every month at a glance.
26January10° · Sea 17° · 3 h
In January, Nagasaki is cool: daytime highs average 10 °C, and nights cool down to about 7 °C. The sea averages 16.6 °C – swimming is only for the hardy. The sun is scarce, with only about 3 hours a day. Rain is frequent, with about 11 rainy days and 79 mm in total. All in all, January is not an ideal month for a holiday in Nagasaki.
Nagasaki in January35February11° · Sea 16° · 4 h
In February, Nagasaki is cool: daytime highs average 11 °C, and nights cool down to about 7 °C. The sea averages 15.6 °C – swimming is only for the hardy. Expect around 4 hours of sunshine a day. Rain is frequent, with about 11 rainy days and 102 mm in total. All in all, February is not an ideal month for a holiday in Nagasaki.
Nagasaki in February50March14° · Sea 16° · 5 h
In March, Nagasaki is cool: daytime highs average 14 °C, and nights cool down to about 9 °C. The sea averages 16.0 °C – swimming is only for the hardy. Expect around 5 hours of sunshine a day. Rain is frequent, with about 12 rainy days and 145 mm in total. All in all, March is a so-so month for a holiday in Nagasaki.
Nagasaki in March71April18° · Sea 17° · 6 h
In April, Nagasaki is mild: daytime highs average 18 °C, and nights cool down to about 13 °C. The sea averages 17.4 °C – bracing, so a wetsuit helps for longer swims. Expect around 6 hours of sunshine a day. Rain is frequent, with about 11 rainy days and 156 mm in total. All in all, April is a good month for a holiday in Nagasaki.
Nagasaki in April76May21° · Sea 20° · 6 h
In May, Nagasaki is warm: daytime highs average 21 °C, and nights cool down to about 17 °C. The sea averages 19.7 °C – bracing, so a wetsuit helps for longer swims. Expect around 6 hours of sunshine a day. Rain is frequent, with about 11 rainy days and 210 mm in total. All in all, May is a good month for a holiday in Nagasaki.
Nagasaki in May58June24° · Sea 23° · 4 h
In June, Nagasaki is warm: daytime highs average 24 °C, and even at night it stays warm at around 21 °C. The sea averages 22.6 °C – refreshing for a swim. Expect around 4 hours of sunshine a day. It rains often – on about 16 days, adding up to 419 mm. The air is often humid and muggy. All in all, June is a so-so month for a holiday in Nagasaki.
Nagasaki in June58July28° · Sea 26° · 6 h
In July, Nagasaki is hot: daytime highs average 28 °C, and even at night it stays warm at around 25 °C. The sea averages 25.7 °C – pleasant for swimming. Expect around 6 hours of sunshine a day. It rains often – on about 17 days, adding up to 323 mm. The air is often humid and muggy. All in all, July is a so-so month for a holiday in Nagasaki.
Nagasaki in July58August29° · Sea 28° · 7 h
In August, Nagasaki is hot: daytime highs average 29 °C, and even at night it stays warm at around 26 °C. The sea averages 27.9 °C – lovely and warm for swimming. The sun shines for around 7 hours a day. It rains often – on about 14 days, adding up to 214 mm. On about 8 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, August is a so-so month for a holiday in Nagasaki.
Nagasaki in August71September27° · Sea 27° · 6 h
In September, Nagasaki is hot: daytime highs average 27 °C, and even at night it stays warm at around 23 °C. The sea averages 26.9 °C – lovely and warm for swimming. Expect around 6 hours of sunshine a day. Rain is frequent, with about 13 rainy days and 196 mm in total. The air is often humid and muggy. All in all, September is a good month for a holiday in Nagasaki.
Nagasaki in September81October23° · Sea 24° · 6 h
In October, Nagasaki is warm: daytime highs average 23 °C, and nights cool down to about 19 °C. The sea averages 24.4 °C – pleasant for swimming. Expect around 6 hours of sunshine a day. Rain falls on about 8 days, adding up to 114 mm. All in all, October is an excellent month for a holiday in Nagasaki.
Nagasaki in October71November18° · Sea 22° · 5 h
In November, Nagasaki is mild: daytime highs average 18 °C, and nights cool down to about 14 °C. The sea averages 21.5 °C – refreshing for a swim. Expect around 5 hours of sunshine a day. Rain is frequent, with about 9 rainy days and 111 mm in total. All in all, November is a good month for a holiday in Nagasaki.
Nagasaki in November40December12° · Sea 19° · 4 h
In December, Nagasaki is cool: daytime highs average 12 °C, and nights cool down to about 9 °C. The sea averages 18.7 °C – bracing, so a wetsuit helps for longer swims. The sun is scarce, with only about 4 hours a day. Rain is frequent, with about 11 rainy days and 88 mm in total. All in all, December is a so-so month for a holiday in Nagasaki.
Nagasaki in DecemberNagasaki compared
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Nagasaki vs. Kumamoto
In October the holiday weather in Nagasaki and Kumamoto is about equally good (score 81 vs. 80). During the day it is about as warm in Kumamoto as in Nagasaki. The sea in Kumamoto is 1 °C cooler. Kumamoto gets one hour less sunshine a day.
| in October | Nagasaki | Kumamoto |
|---|---|---|
| Holiday score | 81 | 80 |
| Daytime high | 23° | 23° |
| Sea | 24° | 23° |
| Sunshine | 6 h | 5 h |
| Rainy days | 8 | 8 |
| Best time | Apr – May, Sep – Nov | Apr – May, Sep – Nov |
Through the year
Japan in October: the best places
In October, Nagasaki ranks 1 among the 31 nearest destinations in this country.
- NagasakiThis page23°24°81
- 2Fukuoka22°23°81
- 3Hiroshima22°23°81
- 4Kumamoto23°23°80
- 5Kitakyūshū22°23°79
- 6Okayama22°24°78
- 7Kagoshima24°26°77
- 8Okinawa26°27°77
Planning a trip to Nagasaki
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Nagasaki 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.
Nagasaki has its best school-holiday weather during October half-term (score 81) and its weakest during the Christmas holidays (score 33).
- 65
Easter holidays
Mar – Apr
Good
- 16 °C by day
- Sea 17 °C
- 5.7 h of sun a day
- 11 rainy days a month
- 72
May half-term
May – Jun
Good
- 22 °C by day
- Sea 20 °C
- 5.7 h of sun a day
- 12 rainy days a month
Good for: Sightseeing & walks
- 58
Summer holidays
Jul – Aug
Fair
- 28 °C by day
- Sea 27 °C
- 6.4 h of sun a day
- 15 rainy days a month
Keep in mind: Frequent rain, Storm season
- 81
October half-term
Oct
ExcellentBest holidays
- 23 °C by day
- Sea 24 °C
- 5.8 h of sun a day
- 8 rainy days a month
Good for: Sightseeing & walks
Keep in mind: Storm season
- 33
Christmas holidays
Dec – Jan
Poor
- 11 °C by day
- Sea 18 °C
- 3.5 h of sun a day
- 11 rainy days a month
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- about 11 h 55 min
- Distance
- 9,470 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.
Most routes need a change of planes, which adds time.
Estimated from the straight-line distance: 30 minutes for take-off and landing plus 830 km/h cruising speed.
Storm season
Nagasaki lies in an area that Pacific typhoons can reach. The typhoon season runs from June to November, with most storms from August to October. A direct hit on any one place is rare, but if you travel then, keep an eye on weather warnings and book flexibly.
- January
- February
- March
- April
- May
- June: Season
- July: Season
- August: Peak
- September: Peak
- October: Peak
- November: Season
- December
Official season dates of the regional warning centres (NOAA, JMA, IMD, Météo-France, BoM); not a forecast.
Frequently asked questions about Nagasaki
When is the best time to visit Nagasaki?
The best time to visit Nagasaki is from April to May and from September to November. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
How warm is the sea in Nagasaki?
The sea temperature in Nagasaki ranges from 15.6 °C in February to 27.9 °C in August. It is warm enough for a comfortable swim (20 °C and more) from June to November.
Can you swim in Nagasaki in October?
Yes. In October the sea averages 24.4 °C – pleasant for swimming.
What is the warmest month in Nagasaki?
August is the warmest month, with average highs of 29 °C and nights around 26 °C. January is the coolest month at 10 °C.
When does it rain most in Nagasaki?
Rain is most frequent from June to September; the wettest month is June with 419 mm. The driest month is January with 79 mm.
How many hours of sunshine does Nagasaki get?
Nagasaki gets around 1,860 hours of sunshine a year. The sunniest month is August with 6.7 hours a day; in January there are 3.3 hours a day.
What time zone is Nagasaki in?
Nagasaki uses the time zone Asia/Tokyo, at UTC+9 all year.
How long is the flight from London to Nagasaki?
A nonstop flight from London to Nagasaki takes about 11 h 55 min, for a straight-line distance of about 9,470 km. Most routes need a change of planes, which adds time.
When is typhoon season in Nagasaki?
Nagasaki lies in an area that Pacific typhoons can reach. The typhoon season runs from June to November, with most storms from August to October. A direct hit on any one place is rare, but if you travel then, keep an eye on weather warnings and book flexibly.
Which school holidays are best for Nagasaki?
Nagasaki has its best school-holiday weather during October half-term (score 81) and its weakest during the Christmas holidays (score 33). Holiday ratings (0–100): Easter holidays 65, May half-term 72, Summer holidays 58, October half-term 81, Christmas holidays 33.
Near Nagasaki
Other destinations close by.
Places with a climate like Nagasaki
Destinations whose weather through the year is closest to Nagasaki's – good alternatives.