AI-generatedHamamatsu at a glance
- Best time
- Apr – Jun, Oct – Nov
- Warmest month
- Aug · 30°
- Warmest sea
- Aug · 27.0°
- Sunshine a year
- 2,180 h
- Rain a year
- 2,016 mm
- Climate
- Temperate
- Time zone
- UTC+9
- Elevation
- 3 m
Climate in Hamamatsu
Hamamatsu has a temperate climate with warm summers and cool winters. August is the warmest month with average highs of 30 °C, while January is the coolest at 10 °C. With around 2,180 hours of sunshine a year, Hamamatsu is moderately sunny; April is the sunniest month with 6.6 hours a day.
Holiday weather through the year
Weather in October
Holiday weather in October
Good
Best time to visit: April – June, October – November
October is the peak of the typhoon season
Keep in mindFrequent rainStorm season
A typical day in October
- Morning, 08:00: about 18°
- Midday, 13:00: about 22°
- Afternoon, 16:00: about 21°
- Evening, 20:00: about 18°
- Night, 23:00: about 17°
05:5417:16
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 05:38–06:27 · evening 16:42–17:31
- Blue hour
- Morning 05:28–05:38 · evening 17:31–17:41
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 Hamamatsu in October?
In October, Hamamatsu is warm: daytime highs average 22 °C, and nights cool down to about 15 °C. The sea averages 23.7 °C – pleasant for swimming. Expect around 5 hours of sunshine a day. Rain is frequent, with about 13 rainy days and 208 mm in total. All in all, October is a good month for a holiday in Hamamatsu.
More details for October
- Daylight
- 11 h 22 min05:54 – 17:16
- UV index
- 5 · moderateclear sky, noon (estimate)All months
- Muggy days
- 5 daysdew point 18 °C or moreAll months
- Wind
- 17 km/haverage daily peakAll months
- Cloud cover
- 56 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Time zone
- UTC+9Asia/Tokyo
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %35 %
- Few rainy daysweight 30 %39 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in October
- Swimwear
- Sunscreen
- A jumper for the evenings
- Rain jacket or umbrella
Sea temperature in Hamamatsu
Monthly sea surface temperature with the range of cooler and warmer years.
8 in 10 years: 22.3 – 25.3 °C
Swimming season: Jun – Nov
- cold
- fresh
- refreshing
- pleasant
- warm
- very warm
The sea temperature in Hamamatsu ranges from 15.9 °C in February to 27.0 °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 25.9 and 28.0 °C.
| Month | Average | Cool year | Warm year | Feels |
|---|---|---|---|---|
| JanuaryJan | 16.5° | 14.7° | 18.1° | cold |
| FebruaryFeb | 15.9° | 14.5° | 17.6° | cold |
| MarchMar | 16.0° | 14.9° | 17.2° | cold |
| AprilApr | 17.4° | 16.0° | 18.7° | fresh |
| MayMay | 19.4° | 18.3° | 20.2° | fresh |
| JuneJun | 22.1° | 21.0° | 23.2° | refreshing |
| JulyJul | 25.0° | 23.7° | 26.1° | pleasant |
| AugustAug | 27.0° | 25.9° | 28.0° | warm |
| SeptemberSep | 26.1° | 24.7° | 27.4° | warm |
| OctoberOct | 23.7° | 22.3° | 25.3° | pleasant |
| NovemberNov | 21.2° | 20.1° | 22.4° | refreshing |
| DecemberDec | 18.6° | 17.2° | 19.8° | fresh |
Sunshine hours in Hamamatsu
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 5.1 of 11.4 hours of daylight in Hamamatsu, 45 % of the day.
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.
UV index in Hamamatsu
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 5 · moderateAround midday seek shade; use sunscreen, a 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 45 min
- Olive skin
- about 55 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 Hamamatsu: 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, Hamamatsu has about 13 rainy days with 208 mm of rain in total.
Wind and clouds in Hamamatsu
How breezy and how cloudy Hamamatsu 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 Hamamatsu typically peaks at 17 km/h during the day: Beaufort 3, light 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: Dec – Apr.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 56 % of the sky over Hamamatsu: variable cloud, with about 5.1 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 Hamamatsu
How often the day gets hot in Hamamatsu (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, Hamamatsu has about 0 hot days, with an average daytime high of 22 °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 Hamamatsu
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 15°. Ideal for sleeping, often with the window open. Muggy on about 5 days (dew point 18 °C or more).
The coolest nights are in January (2°), the warmest in August (24°). Tropical nights of 20 °C and more are the rule from July to September; then air conditioning or a fan helps you sleep. Nights are pleasant for sleeping (15 to 20 °C) in June and in October. Nights fall below 8 °C on average from December to March, so the room should be heated. It is muggy (dew point 18 °C or more) on about 109 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 | 44 | 10° | 2° | 16.5° | 6.3 h | 6 | 67 |
| FebruaryFeb | 48 | 11° | 2° | 15.9° | 6.4 h | 7 | 91 |
| MarchMar | 58 | 14° | 5° | 16.0° | 6.4 h | 11 | 153 |
| AprilApr | 76 | 19° | 10° | 17.4° | 6.6 h | 12 | 167 |
| MayMay | 73 | 23° | 14° | 19.4° | 6.4 h | 13 | 196 |
| JuneJun | 61 | 25° | 19° | 22.1° | 4.8 h | 16 | 257 |
| JulyJul | 48 | 29° | 23° | 25.0° | 5.6 h | 17 | 275 |
| AugustAug | 43 | 30° | 24° | 27.0° | 6.6 h | 17 | 177 |
| SeptemberSep | 60 | 27° | 21° | 26.1° | 5.3 h | 16 | 231 |
| OctoberOct | 69 | 22° | 15° | 23.7° | 5.1 h | 13 | 208 |
| NovemberNov | 74 | 17° | 9° | 21.2° | 5.8 h | 10 | 125 |
| DecemberDec | 55 | 12° | 4° | 18.6° | 6.2 h | 6 | 71 |
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
34.70° N, 137.73° E · 3 m · Asia/Tokyo
Best time to visit Hamamatsu
The best time to visit Hamamatsu is from April to June and from October to November. The sea stays too cool for a classic beach holiday: even in August it only reaches 27.0 °C. For sightseeing, day trips and hiking, conditions are most comfortable in April and in November. Rain is most frequent from May to October; the wettest month is July with 275 mm.
Hamamatsu through the seasons
How the weather changes over the seasons, with averages for each.
Hamamatsu in spring
Mar – May
Good
- 14–23 °C by day
- Sea 18 °C
- 7 h of sun a day
- 35 rainy days in all
Hamamatsu in summer
Jun – Aug
Fair
- 25–30 °C by day
- Sea 25 °C
- 6 h of sun a day
- 50 rainy days in all
Hamamatsu in autumn
Sep – Nov
Good
- 17–27 °C by day
- Sea 24 °C
- 5 h of sun a day
- 38 rainy days in all
Hamamatsu in winter
Dec – Feb
Fair
- 10–12 °C by day
- Sea 17 °C
- 6 h of sun a day
- 20 rainy days in all
Find your perfect month
Tell us what you like and we rate every month in Hamamatsu for you.
Your best months: May, October
Based on the climate averages; tap a month to see its details.
Compare two months in Hamamatsu
Pick two months to see how the weather differs. A tick marks the clearly better value; for temperatures it depends on your plans.
April has the better holiday weather in Hamamatsu: score 76 against 69. In April, days are 3 °C cooler than in October. The sea is 6 °C cooler in April. April has one rainy day fewer. The sun shines 2 hours longer a day in April.
| Month | October | April |
|---|---|---|
| Weather score | 69 | 76better |
| Day high | 22° | 19° |
| Night low | 15° | 10° |
| Sea | 23.7° | 17.4° |
| Sunshine | 5.1 h | 6.6 hbetter |
| Rainy days | 13 | 12better |
| Rainfall | 208 mm | 167 mmbetter |
| Muggy days | 5 | 0better |
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, Nov
15–28 °C and not too much rain
Rainy months
May – Oct
12 or more rainy days
Hamamatsu month by month
The typical weather for every month at a glance.
44January10° · Sea 17° · 6 h
In January, Hamamatsu is cold: daytime highs average 10 °C, and nights cool down to about 2 °C. The sea averages 16.5 °C – swimming is only for the hardy. Expect around 6 hours of sunshine a day. Rain falls on about 6 days, adding up to 67 mm. All in all, January is a so-so month for a holiday in Hamamatsu.
Hamamatsu in January48February11° · Sea 16° · 6 h
In February, Hamamatsu is cool: daytime highs average 11 °C, and nights cool down to about 2 °C. The sea averages 15.9 °C – swimming is only for the hardy. Expect around 6 hours of sunshine a day. Rain falls on about 7 days, adding up to 91 mm. All in all, February is a so-so month for a holiday in Hamamatsu.
Hamamatsu in February58March14° · Sea 16° · 6 h
In March, Hamamatsu is cool: daytime highs average 14 °C, and nights cool down to about 5 °C. The sea averages 16.0 °C – swimming is only for the hardy. Expect around 6 hours of sunshine a day. Rain is frequent, with about 11 rainy days and 153 mm in total. All in all, March is a so-so month for a holiday in Hamamatsu.
Hamamatsu in March76April19° · Sea 17° · 7 h
In April, Hamamatsu is mild: daytime highs average 19 °C, and nights cool down to about 10 °C. The sea averages 17.4 °C – bracing, so a wetsuit helps for longer swims. The sun shines for around 7 hours a day. Rain is frequent, with about 12 rainy days and 167 mm in total. All in all, April is a good month for a holiday in Hamamatsu.
Hamamatsu in April73May23° · Sea 19° · 6 h
In May, Hamamatsu is warm: daytime highs average 23 °C, and nights cool down to about 14 °C. The sea averages 19.4 °C – bracing, so a wetsuit helps for longer swims. Expect around 6 hours of sunshine a day. Rain is frequent, with about 13 rainy days and 196 mm in total. All in all, May is a good month for a holiday in Hamamatsu.
Hamamatsu in May61June25° · Sea 22° · 5 h
In June, Hamamatsu is warm: daytime highs average 25 °C, and nights cool down to about 19 °C. The sea averages 22.1 °C – refreshing for a swim. Expect around 5 hours of sunshine a day. It rains often – on about 16 days, adding up to 257 mm. The air is often humid and muggy. All in all, June is a good month for a holiday in Hamamatsu.
Hamamatsu in June48July29° · Sea 25° · 6 h
In July, Hamamatsu is hot: daytime highs average 29 °C, and even at night it stays warm at around 23 °C. The sea averages 25.0 °C – pleasant for swimming. Expect around 6 hours of sunshine a day. It rains often – on about 17 days, adding up to 275 mm. On about 11 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, July is a so-so month for a holiday in Hamamatsu.
Hamamatsu in July43August30° · Sea 27° · 7 h
In August, Hamamatsu is hot: daytime highs average 30 °C, and even at night it stays warm at around 24 °C. The sea averages 27.0 °C – lovely and warm for swimming. The sun shines for around 7 hours a day. It rains often – on about 17 days, adding up to 177 mm. On about 17 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 Hamamatsu.
Hamamatsu in August60September27° · Sea 26° · 5 h
In September, Hamamatsu is hot: daytime highs average 27 °C, and even at night it stays warm at around 21 °C. The sea averages 26.1 °C – lovely and warm for swimming. Expect around 5 hours of sunshine a day. It rains often – on about 16 days, adding up to 231 mm. The air is often humid and muggy. All in all, September is a good month for a holiday in Hamamatsu.
Hamamatsu in September69October22° · Sea 24° · 5 h
In October, Hamamatsu is warm: daytime highs average 22 °C, and nights cool down to about 15 °C. The sea averages 23.7 °C – pleasant for swimming. Expect around 5 hours of sunshine a day. Rain is frequent, with about 13 rainy days and 208 mm in total. All in all, October is a good month for a holiday in Hamamatsu.
Hamamatsu in October74November17° · Sea 21° · 6 h
In November, Hamamatsu is mild: daytime highs average 17 °C, and nights cool down to about 9 °C. The sea averages 21.2 °C – refreshing for a swim. Expect around 6 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 125 mm in total. All in all, November is a good month for a holiday in Hamamatsu.
Hamamatsu in November55December12° · Sea 19° · 6 h
In December, Hamamatsu is cool: daytime highs average 12 °C, and nights cool down to about 4 °C. The sea averages 18.6 °C – bracing, so a wetsuit helps for longer swims. Expect around 6 hours of sunshine a day. Rain falls on about 6 days, adding up to 71 mm. All in all, December is a so-so month for a holiday in Hamamatsu.
Hamamatsu in DecemberHamamatsu compared
Put Hamamatsu side by side with another destination.
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Hamamatsu vs. Shizuoka
In October the holiday weather in Hamamatsu and Shizuoka is about equally good (score 69 vs. 65). During the day Shizuoka is 1 °C cooler than Hamamatsu. The sea is about equally warm.
| in October | Hamamatsu | Shizuoka |
|---|---|---|
| Holiday score | 69 | 65 |
| Daytime high | 22° | 21° |
| Sea | 24° | 24° |
| Sunshine | 5 h | 5 h |
| Rainy days | 13 | 14 |
| Best time | Apr – Jun, Oct – Nov | Apr – May, Sep – Nov |
Through the year
Japan in October: the best places
In October, Hamamatsu ranks 14 among the 31 nearest destinations in this country.
- Hiroshima22°23°81
- 2Fukuoka22°23°81
- 3Nagasaki23°24°81
- 4Kumamoto23°23°80
- 5Kitakyūshū22°23°79
- 6Okayama22°24°78
- 7Kagoshima24°26°77
- 8Nagoya22°75
- 14HamamatsuThis page22°24°69
Planning a trip to Hamamatsu
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Hamamatsu 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.
Hamamatsu has its best school-holiday weather during the Easter holidays (score 71) and its weakest during the summer holidays (score 45).
- 71
Easter holidays
Mar – Apr
GoodBest holidays
- 17 °C by day
- Sea 17 °C
- 6.5 h of sun a day
- 11 rainy days a month
- 71
May half-term
May – Jun
Good
- 23 °C by day
- Sea 20 °C
- 6.1 h of sun a day
- 13 rainy days a month
Keep in mind: Frequent rain
- 45
Summer holidays
Jul – Aug
Fair
- 30 °C by day
- Sea 26 °C
- 6.3 h of sun a day
- 17 rainy days a month
Keep in mind: Frequent rain, Storm season
- 69
October half-term
Oct
Good
- 22 °C by day
- Sea 24 °C
- 5.1 h of sun a day
- 13 rainy days a month
Keep in mind: Frequent rain, Storm season
- 50
Christmas holidays
Dec – Jan
Fair
- 11 °C by day
- Sea 18 °C
- 6.3 h of sun a day
- 6 rainy days a month
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- about 12 h 5 min
- Distance
- 9,600 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
Hamamatsu 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 Hamamatsu
When is the best time to visit Hamamatsu?
The best time to visit Hamamatsu is from April to June and from October to November. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
How warm is the sea in Hamamatsu?
The sea temperature in Hamamatsu ranges from 15.9 °C in February to 27.0 °C in August. It is warm enough for a comfortable swim (20 °C and more) from June to November.
Can you swim in Hamamatsu in October?
Yes. In October the sea averages 23.7 °C – pleasant for swimming.
What is the warmest month in Hamamatsu?
August is the warmest month, with average highs of 30 °C and nights around 24 °C. January is the coolest month at 10 °C.
When does it rain most in Hamamatsu?
Rain is most frequent from May to October; the wettest month is July with 275 mm. The driest month is January with 67 mm.
How many hours of sunshine does Hamamatsu get?
Hamamatsu gets around 2,180 hours of sunshine a year. The sunniest month is April with 6.6 hours a day; in June there are 4.8 hours a day.
What time zone is Hamamatsu in?
Hamamatsu uses the time zone Asia/Tokyo, at UTC+9 all year.
How long is the flight from London to Hamamatsu?
A nonstop flight from London to Hamamatsu takes about 12 h 5 min, for a straight-line distance of about 9,600 km. Most routes need a change of planes, which adds time.
When is typhoon season in Hamamatsu?
Hamamatsu 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 Hamamatsu?
Hamamatsu has its best school-holiday weather during the Easter holidays (score 71) and its weakest during the summer holidays (score 45). Holiday ratings (0–100): Easter holidays 71, May half-term 71, Summer holidays 45, October half-term 69, Christmas holidays 50.
Near Hamamatsu
Other destinations close by.
Places with a climate like Hamamatsu
Destinations whose weather through the year is closest to Hamamatsu's – good alternatives.