Climate averages 1991–2020
Hamamatsu weather
in April.
A mild, wet month: the 7th warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
April is a mild month in Hamamatsu: daytime highs average 18.3°C and nights cool to about 9.1°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 164 mm of rain on roughly 11 days, which makes April a wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 02 min on an average April day.
The nearest other city in this atlas is Iwata (11 km away). In April its highs average 18.0°C, about as warm as Hamamatsu, with 164 mm of rain.
Among the 303 cities listed in Japan, Hamamatsu ranks joint 39th of 303 for the warmest April highs and joint 273rd of 303 for the driest April (rainfall, lowest first). The mean April high of those 303 cities is 16.7°C; Hamamatsu is 1.6°C warmer than that mean.
From April to May, average highs rise by 4.0°C to 22.4°C, and monthly rainfall rises from 164 mm to 184 mm.
The annual picture
April in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Hamamatsu climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 9.5°C1.5°C | 1.5°C | 69 | 5.9 | 10.110 h |
| February | 10.5°C1.6°C | 1.6°C | 90 | 7.0 | 10.911 h |
| March | 13.8°C4.4°C | 4.4°C | 148 | 10.8 | 11.912 h |
| April, selected | 18.3°C9.1°C | 9.1°C | 164 | 11.1 | 13.013 h |
| May | 22.4°C14.0°C | 14.0°C | 184 | 12.0 | 14.014 h |
| June | 25.1°C18.6°C | 18.6°C | 258 | 15.7 | 14.414 h |
| July | 28.8°C22.8°C | 22.8°C | 273 | 16.9 | 14.214 h |
| August | 30.2°C24.0°C | 24.0°C | 157 | 16.2 | 13.513 h |
| September | 27.1°C20.9°C | 20.9°C | 247 | 15.8 | 12.412 h |
| October | 22.1°C15.2°C | 15.2°C | 216 | 12.5 | 11.311 h |
| November | 17.0°C9.2°C | 9.2°C | 122 | 9.2 | 10.410 h |
| December | 11.8°C3.8°C | 3.8°C | 71 | 6.6 | 9.910 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
April in nearby cities
- Iwata in AprilJapan · 11 kmHigh 18.0°C · Low 9.1°C · 164 mm rain
- Hamakita in AprilJapan · 12 kmHigh 18.1°C · Low 8.5°C · 164 mm rain
- Fukuroi in AprilJapan · 18 kmHigh 18.0°C · Low 8.9°C · 173 mm rain
- Kakegawa in AprilJapan · 27 kmHigh 17.7°C · Low 9.2°C · 173 mm rain
- Toyohashi in AprilJapan · 33 kmHigh 18.1°C · Low 8.8°C · 151 mm rain
- Shimada in AprilJapan · 43 kmHigh 16.5°C · Low 9.7°C · 193 mm rain
- Gamagōri in AprilJapan · 48 kmHigh 17.7°C · Low 9.2°C · 143 mm rain
- Fujieda in AprilJapan · 52 kmHigh 17.0°C · Low 9.9°C · 193 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Hamamatsu) is explained once on the Hamamatsu year overview and on the Sources, method and limits page.
Iwata and Hamakita lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.