Climate averages 1991–2020
Iwata weather
in May.
A warm, very wet month: the 5th warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a warm month in Iwata: daytime highs average 22.0°C and nights cool to about 13.9°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 184 mm of rain on roughly 12 days, which makes May a very wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 57 min on an average May day.
The nearest other city in this atlas is Fukuroi (8 km away). In May its highs average 22.0°C, about as warm as Iwata, with 196 mm of rain.
Among the 303 cities listed in Japan, Iwata ranks joint 135th of 303 for the warmest May highs and joint 273rd of 303 for the driest May (rainfall, lowest first). The mean May high of those 303 cities is 21.3°C; Iwata is 0.6°C warmer than that mean.
From May to June, average highs rise by 2.8°C to 24.8°C, and monthly rainfall rises from 184 mm to 258 mm.
The annual picture
May 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, selected | 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 | 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
May in nearby cities
- Fukuroi in MayJapan · 8 kmHigh 22.0°C · Low 13.7°C · 196 mm rain
- Hamamatsu in MayJapan · 11 kmHigh 22.4°C · Low 14.0°C · 184 mm rain
- Hamakita in MayJapan · 13 kmHigh 22.2°C · Low 13.4°C · 184 mm rain
- Kakegawa in MayJapan · 17 kmHigh 21.7°C · Low 13.9°C · 196 mm rain
- Shimada in MayJapan · 33 kmHigh 20.4°C · Low 14.1°C · 223 mm rain
- Fujieda in MayJapan · 42 kmHigh 20.8°C · Low 14.2°C · 223 mm rain
- Toyohashi in MayJapan · 43 kmHigh 22.3°C · Low 13.7°C · 170 mm rain
- Shizuoka in MayJapan · 58 kmHigh 21.1°C · Low 13.9°C · 234 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.