Hamamatsu climate
Hamamatsu (Japan) has a humid subtropical climate (Köppen Cfa). The average temperature over the year is 18 °C64 °F, and about 1,970 mm78 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Hamamatsu climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 1151 | 745 | 948 | 732.9 |
| Feb | 1152 | 846 | 949 | 893.5 |
| Mar | 1457 | 1049 | 1253 | 1345.3 |
| Apr | 1763 | 1457 | 1560 | 1777.0 |
| May | 2169 | 1864 | 1966 | 1907.5 |
| Jun | 2374 | 2170 | 2272 | 2339.2 |
| Jul | 2780 | 2577 | 2678 | 2419.5 |
| Aug | 2883 | 2679 | 2781 | 1736.8 |
| Sep | 2679 | 2475 | 2577 | 2429.5 |
| Oct | 2272 | 2068 | 2170 | 2349.2 |
| Nov | 1865 | 1559 | 1762 | 1074.2 |
| Dec | 1356 | 1050 | 1253 | 783.1 |
| Year | 2883 | 745 | 1864 | 1,97078 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 75% | 59% | 2.7 | 10:04 |
| Feb | 73% | 61% | 3.3 | 10:53 |
| Mar | 72% | 59% | 4.3 | 11:52 |
| Apr | 75% | 62% | 5.0 | 13:01 |
| May | 80% | 66% | 5.3 | 13:58 |
| Jun | 85% | 78% | 4.8 | 14:28 |
| Jul | 88% | 69% | 5.3 | 14:16 |
| Aug | 85% | 55% | 5.6 | 13:27 |
| Sep | 80% | 62% | 4.3 | 12:20 |
| Oct | 75% | 62% | 3.3 | 11:14 |
| Nov | 73% | 58% | 2.7 | 10:18 |
| Dec | 74% | 57% | 2.4 | 9:50 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Hamamatsu is like
The warmest month is August, with an average high of 28 °C83 °F and a low of 26 °C79 °F. The coldest is January, when highs average 11 °C51 °F and lows 7 °C45 °F. Seasons are strongly marked: the warmest month is on average 18.3 °C32.9 °F warmer than the coldest.
It is wet, with about 1,970 mm78 in of precipitation per year. The wettest three-month stretch is May–July, which brings 34% of the annual total. The wettest month is September (242 mm9.5 in), the driest is January (73 mm2.9 in).
Relative humidity ranges from 72% in March to 88% in July. The clearest skies (lowest average cloud amount, 55%) are typical of August. Average wind speed near the ground ranges from 15 km/h (9 mph) in July to 27 km/h (17 mph) in January. Daylight lasts from about 9.8 hours in December to 14.5 hours in June.
Best time to visit Hamamatsu
Based on these averages, the most comfortable months for sightseeing and outdoor activities are November: average highs of 18 °C65 °F to 18 °C65 °F with 107 mm4.2 in to 107 mm4.2 in of precipitation per month.
The most challenging month is July, which is very wet (241 mm9.5 in) and humid (88% relative humidity).
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Hamamatsu
- Winter (December–February) — highs 1151 to 13 °C56 °F, lows 745 to 10 °C50 °F, about 80 mm3.1 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket.
- Spring (March–May) — highs 1457 to 21 °C69 °F, lows 1049 to 18 °C64 °F, about 167 mm6.6 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket and an umbrella or light rain jacket.
- Summer (June–August) — highs 2374 to 28 °C83 °F, lows 2170 to 26 °C79 °F, about 216 mm8.5 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and a good rain jacket or umbrella and quick-drying shoes.
- Autumn (September–November) — highs 1865 to 26 °C79 °F, lows 1559 to 24 °C75 °F, about 194 mm7.6 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket and an umbrella or light rain jacket.
How Hamamatsu compares
Compared with Nagoya, about 92 km to the northwest, Hamamatsu is on average 2 °C3.7 °F warmer and receives 13% more precipitation (1,970 mm78 in vs 1,741 mm69 in). The difference is largest in December (4.5 °C8 °F warmer).
Of the 111 places in Japan covered by World Climates, Hamamatsu is the 8th warmest by annual mean temperature and the 20th wettest by annual precipitation. See all of them on the Japan climate page.
Places in other countries with the most similar temperature and rainfall pattern: Zhoushan (China, Cfa), Jeju City (South Korea, Cfa) and Taizhou (China, Cfa).
Nearby places
- Iwata 11 km · 18 °C65 °F · 2,086 mm82 in
- Toyohashi 33 km · 16 °C61 °F · 1,776 mm70 in
- Okazaki 59 km · 16 °C60 °F · 1,741 mm69 in
- Shizuoka 67 km · 16 °C61 °F · 1,875 mm74 in
- Toyota 68 km · 16 °C60 °F · 1,741 mm69 in
- Tajimi 88 km · 14 °C58 °F · 1,803 mm71 in
- Iida 91 km · 13 °C56 °F · 1,586 mm62 in
- Nagoya 92 km · 16 °C61 °F · 1,741 mm69 in
Frequently asked questions
What is the warmest month in Hamamatsu?
August is the warmest month in Hamamatsu, with an average high of 28 °C (83 °F) and an average low of 26 °C (79 °F).
What is the coldest month in Hamamatsu?
January is the coldest month, with an average high of 11 °C (51 °F) and an average low of 7 °C (45 °F).
When does it rain the most in Hamamatsu?
September is the wettest month with about 242 mm (9.5 in) of precipitation; January is the driest with about 73 mm (2.9 in).
What is the best time to visit Hamamatsu?
Judging by long-term averages, the most comfortable months are November.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.