Izumo, Japan climate
Cfa Humid subtropical
Izumo 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 1°C at night. Around 1696 mm of precipitation falls each year, peaking in July (230 mm) and easing off in February (99 mm).
☀️
Summers
Hot
Highs near 31°C in August.
❄️
Winters
Chilly
Lows near 1°C in January.
🌧️
Rain
Very wet
About 1696 mm of rain a year.
Wettest in July
⛅
Sky & trend
Often grey
Overcast skies dominate much of the year.
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)Izumo climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 8 | 9 | 13 | 18 | 23 | 26 | 30 | 31 | 27 | 22 | 17 | 11 |
| Avg temp (°C) | 5 | 5 | 8 | 13 | 17 | 21 | 25 | 26 | 22 | 17 | 12 | 7 |
| Avg low (°C) | 1 | 1 | 3 | 7 | 12 | 17 | 22 | 22 | 18 | 12 | 7 | 3 |
| Precipitation (mm) | 122 | 99 | 123 | 112 | 130 | 183 | 230 | 146 | 187 | 113 | 115 | 136 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 8 | 9 | 13 | 18 | 23 | 26 |
| Avg temp (°C) | 5 | 5 | 8 | 13 | 17 | 21 |
| Avg low (°C) | 1 | 1 | 3 | 7 | 12 | 17 |
| Precipitation (mm) | 122 | 99 | 123 | 112 | 130 | 183 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 30 | 31 | 27 | 22 | 17 | 11 |
| Avg temp (°C) | 25 | 26 | 22 | 17 | 12 | 7 |
| Avg low (°C) | 22 | 22 | 18 | 12 | 7 | 3 |
| Precipitation (mm) | 230 | 146 | 187 | 113 | 115 | 136 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 88 | 83 | 75 | 68 | 69 | 78 | 75 | 65 | 71 | 68 | 75 | 84 |
| Relative humidity (%) | 74 | 73 | 73 | 76 | 81 | 85 | 88 | 83 | 78 | 72 | 72 | 74 |
| Wind speed (km/h) | 23.8 | 21.9 | 20.6 | 18.5 | 15.8 | 13.6 | 14.9 | 15.2 | 17.7 | 18.8 | 20.6 | 23.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 88 | 83 | 75 | 68 | 69 | 78 |
| Relative humidity (%) | 74 | 73 | 73 | 76 | 81 | 85 |
| Wind speed (km/h) | 23.8 | 21.9 | 20.6 | 18.5 | 15.8 | 13.6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 75 | 65 | 71 | 68 | 75 | 84 |
| Relative humidity (%) | 88 | 83 | 78 | 72 | 72 | 74 |
| Wind speed (km/h) | 14.9 | 15.2 | 17.7 | 18.8 | 20.6 | 23.5 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Izumo, about 5 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.