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Yamaguchi, Japan climate
Cfa Humid subtropical
Yamaguchi has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 91°F, while the coldest is January averaging around 33°F at night. Precipitation totals about 76 inches a year and is strongly seasonal — July alone averages 13.5 inches while December barely receives 2.78 inches.
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)Yamaguchi climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 49 | 52 | 59 | 68 | 77 | 82 | 88 | 91 | 84 | 75 | 64 | 53 |
| Avg temp (°F) | 40 | 42 | 48 | 57 | 66 | 73 | 80 | 81 | 74 | 64 | 53 | 44 |
| Avg low (°F) | 33 | 33 | 38 | 47 | 56 | 65 | 73 | 74 | 67 | 55 | 45 | 36 |
| Precipitation (in) | 3.0 | 3.3 | 5.7 | 6.6 | 7.8 | 11.1 | 13.5 | 8.1 | 7.1 | 3.6 | 3.3 | 2.8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 49 | 52 | 59 | 68 | 77 | 82 |
| Avg temp (°F) | 40 | 42 | 48 | 57 | 66 | 73 |
| Avg low (°F) | 33 | 33 | 38 | 47 | 56 | 65 |
| Precipitation (in) | 3.0 | 3.3 | 5.7 | 6.6 | 7.8 | 11.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 88 | 91 | 84 | 75 | 64 | 53 |
| Avg temp (°F) | 80 | 81 | 74 | 64 | 53 | 44 |
| Avg low (°F) | 73 | 74 | 67 | 55 | 45 | 36 |
| Precipitation (in) | 13.5 | 8.1 | 7.1 | 3.6 | 3.3 | 2.8 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 85 | 81 | 75 | 68 | 67 | 79 | 74 | 67 | 72 | 67 | 74 | 81 |
| Relative humidity (%) | 77 | 76 | 76 | 77 | 79 | 83 | 84 | 82 | 82 | 80 | 78 | 78 |
| Wind speed (mph) | 4.9 | 4.6 | 4.2 | 3.4 | 2.9 | 2.6 | 2.6 | 2.9 | 3.2 | 3.5 | 3.8 | 4.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 85 | 81 | 75 | 68 | 67 | 79 |
| Relative humidity (%) | 77 | 76 | 76 | 77 | 79 | 83 |
| Wind speed (mph) | 4.9 | 4.6 | 4.2 | 3.4 | 2.9 | 2.6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 74 | 67 | 72 | 67 | 74 | 81 |
| Relative humidity (%) | 84 | 82 | 82 | 80 | 78 | 78 |
| Wind speed (mph) | 2.6 | 2.9 | 3.2 | 3.5 | 3.8 | 4.6 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Yamaguchi, about 2 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.