Iwata, Japan climate
Cfa Humid subtropical
Iwata has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 31°C, while the coldest is January averaging around 2°C at night. Precipitation totals about 1710 mm a year and is strongly seasonal — June alone averages 222 mm while January barely receives 52 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Iwata climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 11 | 12 | 15 | 19 | 23 | 25 | 29 | 31 | 28 | 24 | 19 | 13 |
| Avg temp (°C) | 6 | 7 | 10 | 15 | 19 | 22 | 25 | 27 | 24 | 19 | 14 | 9 |
| Avg low (°C) | 2 | 3 | 5 | 10 | 15 | 19 | 23 | 24 | 21 | 15 | 10 | 4 |
| Precipitation (mm) | 52 | 75 | 134 | 159 | 170 | 222 | 196 | 125 | 218 | 195 | 106 | 59 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 11 | 12 | 15 | 19 | 23 | 25 |
| Avg temp (°C) | 6 | 7 | 10 | 15 | 19 | 22 |
| Avg low (°C) | 2 | 3 | 5 | 10 | 15 | 19 |
| Precipitation (mm) | 52 | 75 | 134 | 159 | 170 | 222 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 29 | 31 | 28 | 24 | 19 | 13 |
| Avg temp (°C) | 25 | 27 | 24 | 19 | 14 | 9 |
| Avg low (°C) | 23 | 24 | 21 | 15 | 10 | 4 |
| Precipitation (mm) | 196 | 125 | 218 | 195 | 106 | 59 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 57 | 59 | 60 | 62 | 67 | 79 | 70 | 56 | 65 | 62 | 56 | 54 |
| Relative humidity (%) | 71 | 70 | 71 | 74 | 79 | 85 | 88 | 85 | 80 | 75 | 71 | 71 |
| Wind speed (mph) | 15.9 | 14.9 | 13.7 | 12.5 | 10.7 | 10.1 | 9.9 | 9.6 | 10.6 | 12.1 | 12.6 | 15.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 57 | 59 | 60 | 62 | 67 | 79 |
| Relative humidity (%) | 71 | 70 | 71 | 74 | 79 | 85 |
| Wind speed (mph) | 15.9 | 14.9 | 13.7 | 12.5 | 10.7 | 10.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 70 | 56 | 65 | 62 | 56 | 54 |
| Relative humidity (%) | 88 | 85 | 80 | 75 | 71 | 71 |
| Wind speed (mph) | 9.9 | 9.6 | 10.6 | 12.1 | 12.6 | 15.3 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Iwata, about 3 km from the city centre.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.