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Sendai, Japan climate
Cfa Humid subtropical
Sendai has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 83°F, while the coldest is January averaging around 30°F at night. Precipitation totals about 50 inches a year and is strongly seasonal — September alone averages 7.6 inches while February barely receives 1.33 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)Sendai climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 42 | 44 | 50 | 60 | 68 | 74 | 80 | 83 | 77 | 68 | 57 | 47 |
| Avg temp (°F) | 36 | 36 | 42 | 51 | 60 | 67 | 73 | 76 | 70 | 60 | 50 | 40 |
| Avg low (°F) | 30 | 30 | 35 | 43 | 53 | 61 | 68 | 71 | 64 | 53 | 42 | 34 |
| Precipitation (in) | 1.7 | 1.3 | 2.9 | 3.6 | 4.3 | 5.7 | 7.0 | 6.2 | 7.6 | 5.9 | 2.3 | 1.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 42 | 44 | 50 | 60 | 68 | 74 |
| Avg temp (°F) | 36 | 36 | 42 | 51 | 60 | 67 |
| Avg low (°F) | 30 | 30 | 35 | 43 | 53 | 61 |
| Precipitation (in) | 1.7 | 1.3 | 2.9 | 3.6 | 4.3 | 5.7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 80 | 83 | 77 | 68 | 57 | 47 |
| Avg temp (°F) | 73 | 76 | 70 | 60 | 50 | 40 |
| Avg low (°F) | 68 | 71 | 64 | 53 | 42 | 34 |
| Precipitation (in) | 7.0 | 6.2 | 7.6 | 5.9 | 2.3 | 1.7 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 77 | 75 | 73 | 71 | 71 | 77 | 80 | 71 | 76 | 72 | 74 | 79 |
| Relative humidity (%) | 95 | 93 | 87 | 82 | 81 | 83 | 86 | 85 | 87 | 87 | 89 | 93 |
| Wind speed (mph) | 4.2 | 5.0 | 4.5 | 3.2 | 2.1 | 1.6 | 1.5 | 1.5 | 1.6 | 1.7 | 2.0 | 3.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 77 | 75 | 73 | 71 | 71 | 77 |
| Relative humidity (%) | 95 | 93 | 87 | 82 | 81 | 83 |
| Wind speed (mph) | 4.2 | 5.0 | 4.5 | 3.2 | 2.1 | 1.6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 80 | 71 | 76 | 72 | 74 | 79 |
| Relative humidity (%) | 86 | 85 | 87 | 87 | 89 | 93 |
| Wind speed (mph) | 1.5 | 1.5 | 1.6 | 1.7 | 2.0 | 3.0 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Sendai, 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.