Saiki, Japan climate
Cfa Humid subtropical
Saiki 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 3°C at night. Precipitation totals about 2132 mm a year and is strongly seasonal — September alone averages 339 mm while December barely receives 60 mm.
☀️
Summers
Hot
Highs near 31°C in August.
❄️
Winters
Chilly
Lows near 3°C in January.
🌧️
Rain
Very wet
About 2132 mm of rain a year.
Wettest in September
⛅
Sky & trend
Often cloudy
Cloudy skies 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)Saiki climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 11 | 12 | 15 | 20 | 24 | 26 | 30 | 31 | 28 | 23 | 18 | 13 |
| Avg temp (°C) | 7 | 8 | 11 | 15 | 19 | 22 | 26 | 27 | 24 | 19 | 14 | 9 |
| Avg low (°C) | 3 | 3 | 6 | 10 | 15 | 19 | 23 | 24 | 21 | 15 | 10 | 5 |
| Precipitation (mm) | 62 | 71 | 116 | 137 | 179 | 333 | 283 | 247 | 339 | 201 | 104 | 60 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 11 | 12 | 15 | 20 | 24 | 26 |
| Avg temp (°C) | 7 | 8 | 11 | 15 | 19 | 22 |
| Avg low (°C) | 3 | 3 | 6 | 10 | 15 | 19 |
| Precipitation (mm) | 62 | 71 | 116 | 137 | 179 | 333 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 30 | 31 | 28 | 23 | 18 | 13 |
| Avg temp (°C) | 26 | 27 | 24 | 19 | 14 | 9 |
| Avg low (°C) | 23 | 24 | 21 | 15 | 10 | 5 |
| Precipitation (mm) | 283 | 247 | 339 | 201 | 104 | 60 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 61 | 64 | 65 | 65 | 72 | 84 | 72 | 66 | 70 | 60 | 58 | 57 |
| Relative humidity (%) | 78 | 76 | 75 | 76 | 79 | 84 | 85 | 84 | 83 | 79 | 78 | 78 |
| Wind speed (m/s) | 2.6 | 2.6 | 2.4 | 2.0 | 1.6 | 1.3 | 1.2 | 1.4 | 1.7 | 2.1 | 2.2 | 2.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 61 | 64 | 65 | 65 | 72 | 84 |
| Relative humidity (%) | 78 | 76 | 75 | 76 | 79 | 84 |
| Wind speed (m/s) | 2.6 | 2.6 | 2.4 | 2.0 | 1.6 | 1.3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 72 | 66 | 70 | 60 | 58 | 57 |
| Relative humidity (%) | 85 | 84 | 83 | 79 | 78 | 78 |
| Wind speed (m/s) | 1.2 | 1.4 | 1.7 | 2.1 | 2.2 | 2.6 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Saiki, inside the city.
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.