Climate averages 1991–2020
Iwata weather
in August.
A hot, wet month: the warmest and the 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Iwata: daytime highs average 29.7°C and nights cool to about 23.9°C. By daytime temperature it is the warmest month of the year.
Expect about 157 mm of rain on roughly 16 days, which makes August a wet month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 27 min on an average August day.
The nearest other city in this atlas is Fukuroi (8 km away). In August its highs average 29.6°C, about as warm as Iwata, with 174 mm of rain.
Among the 303 cities listed in Japan, Iwata ranks joint 136th of 303 for the warmest August highs and joint 178th of 303 for the driest August (rainfall, lowest first). The mean August high of those 303 cities is 29.2°C; Iwata is 0.5°C warmer than that mean.
From August to September, average highs fall by 3.0°C to 26.7°C, and monthly rainfall rises from 157 mm to 247 mm.
The annual picture
August 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
Iwata climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 9.4°C1.9°C | 1.9°C | 69 | 5.9 | 10.110 h |
| February | 10.5°C1.9°C | 1.9°C | 90 | 7.0 | 10.911 h |
| March | 13.6°C4.6°C | 4.6°C | 148 | 10.8 | 11.912 h |
| April | 18.0°C9.1°C | 9.1°C | 164 | 11.1 | 13.013 h |
| May | 22.0°C13.9°C | 13.9°C | 184 | 12.0 | 14.014 h |
| June | 24.8°C18.5°C | 18.5°C | 258 | 15.7 | 14.414 h |
| July | 28.4°C22.8°C | 22.8°C | 273 | 16.9 | 14.214 h |
| August, selected | 29.7°C23.9°C | 23.9°C | 157 | 16.2 | 13.513 h |
| September | 26.7°C21.0°C | 21.0°C | 247 | 15.8 | 12.412 h |
| October | 21.8°C15.4°C | 15.4°C | 216 | 12.5 | 11.311 h |
| November | 16.9°C9.6°C | 9.6°C | 122 | 9.2 | 10.410 h |
| December | 11.7°C4.2°C | 4.2°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
August in nearby cities
- Fukuroi in AugustJapan · 8 kmHigh 29.6°C · Low 23.6°C · 174 mm rain
- Hamamatsu in AugustJapan · 11 kmHigh 30.2°C · Low 24.0°C · 157 mm rain
- Hamakita in AugustJapan · 13 kmHigh 29.9°C · Low 23.5°C · 157 mm rain
- Kakegawa in AugustJapan · 17 kmHigh 29.3°C · Low 23.6°C · 174 mm rain
- Shimada in AugustJapan · 33 kmHigh 27.9°C · Low 23.5°C · 171 mm rain
- Fujieda in AugustJapan · 42 kmHigh 28.3°C · Low 23.6°C · 171 mm rain
- Toyohashi in AugustJapan · 43 kmHigh 30.2°C · Low 23.6°C · 144 mm rain
- Shizuoka in AugustJapan · 58 kmHigh 28.6°C · Low 23.5°C · 191 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 Iwata) is explained once on the Iwata year overview and on the Sources, method and limits page.
Hamamatsu 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.