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 88°F, while the coldest is January averaging around 34°F at night. Around 67 inches of precipitation falls each year, peaking in July (9.0 inches) and easing off in February (3.9 inches).
☀️
Summers
Hot
Highs near 88°F in August.
❄️
Winters
Chilly
Lows near 34°F in January.
🌧️
Rain
Very wet
About 67 in 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 (°F) | 47 | 49 | 55 | 64 | 73 | 79 | 85 | 88 | 81 | 72 | 62 | 52 |
| Avg temp (°F) | 41 | 41 | 46 | 55 | 63 | 70 | 78 | 80 | 72 | 62 | 53 | 45 |
| Avg low (°F) | 34 | 33 | 37 | 44 | 53 | 62 | 71 | 72 | 64 | 53 | 44 | 38 |
| Precipitation (in) | 4.8 | 3.9 | 4.9 | 4.4 | 5.1 | 7.2 | 9.0 | 5.7 | 7.4 | 4.5 | 4.5 | 5.4 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 47 | 49 | 55 | 64 | 73 | 79 |
| Avg temp (°F) | 41 | 41 | 46 | 55 | 63 | 70 |
| Avg low (°F) | 34 | 33 | 37 | 44 | 53 | 62 |
| Precipitation (in) | 4.8 | 3.9 | 4.9 | 4.4 | 5.1 | 7.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 85 | 88 | 81 | 72 | 62 | 52 |
| Avg temp (°F) | 78 | 80 | 72 | 62 | 53 | 45 |
| Avg low (°F) | 71 | 72 | 64 | 53 | 44 | 38 |
| Precipitation (in) | 9.0 | 5.7 | 7.4 | 4.5 | 4.5 | 5.4 |
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 (mph) | 14.8 | 13.6 | 12.8 | 11.5 | 9.8 | 8.5 | 9.3 | 9.4 | 11.0 | 11.7 | 12.8 | 14.6 |
| 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 (mph) | 14.8 | 13.6 | 12.8 | 11.5 | 9.8 | 8.5 |
| 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 (mph) | 9.3 | 9.4 | 11.0 | 11.7 | 12.8 | 14.6 |
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.