Average annual temperature is 16.0 °C
Absolute maximum temperature: 37.0 °C
Absolute minimum temperature: -11.4 °C
Number of sunny days: 152 days
Number of rainy days: 208 days
Number of snow days: 5 days
Look at detailed online map of Sumiyama
* Weather data for Sumiyama Japan is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 16.3 | 16.0 | 23.7 | 25.5 | 27.1 | 30.1 | 35.1 | 37.0 | 33.6 | 26.0 | 26.7 | 20.1 |
| Average daytime temperature (°C) | 8.8 | 9.6 | 16.6 | 19.4 | 23.0 | 25.9 | 31.6 | 33.1 | 30.8 | 22.1 | 17.3 | 12.2 |
| Average temperature (°C) | 3.8 | 4.9 | 10.6 | 13.8 | 17.9 | 22.0 | 27.1 | 28.6 | 26.0 | 16.7 | 12.2 | 7.1 |
| Average night temperature (°C) | -0.6 | 0.9 | 5.3 | 8.7 | 13.5 | 18.5 | 23.2 | 25.1 | 22.0 | 12.2 | 8.0 | 2.7 |
| Absolute minimum temperature (°C) | -11.4 | -2.7 | -1.8 | 2.9 | 5.9 | 12.7 | 19.1 | 23.2 | 17.6 | 7.5 | 1.8 | -3.7 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 10.1 | 10.9 | 12.0 | 13.1 | 14.0 | 14.5 | 14.2 | 13.4 | 12.4 | 11.3 | 10.4 | 9.9 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 | 9.0 |
| Sunshine mean duration (h) | 7.1 | 6.0 | 8.5 | 8.0 | 9.5 | 6.8 | 9.9 | 10.1 | 9.9 | 8.7 | 7.4 | 7.0 |
| Precipitation (mm) | 46 | 49 | 115 | 175 | 224 | 330 | 105 | 183 | 81 | 54 | 124 | 49 |
| Sunny days | 8 | 11 | 19 | 14 | 17 | 9 | 10 | 7 | 8 | 15 | 16 | 18 |
| Rainy days | 20 | 15 | 12 | 16 | 14 | 21 | 21 | 24 | 22 | 16 | 14 | 13 |
| Snow days | 3 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Sumiyama is at