Average annual temperature is 10.3 °C
Absolute maximum temperature: 28.1 °C
Absolute minimum temperature: -17.0 °C
Number of sunny days: 109 days
Number of rainy days: 229 days
Number of snow days: 27 days
Look at detailed online map of Niihama Shi
* Weather data for Niihama Shi 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) | 14.0 | 10.6 | 17.9 | 20.4 | 25.2 | 27.5 | 28.1 | 27.5 | 26.2 | 20.5 | 20.0 | 16.4 |
| Average daytime temperature (°C) | 1.6 | 3.2 | 10.5 | 13.6 | 17.4 | 21.1 | 25.8 | 24.8 | 23.4 | 15.5 | 11.2 | 5.2 |
| Average temperature (°C) | -2.5 | -1.1 | 6.0 | 8.9 | 13.1 | 17.2 | 21.6 | 21.3 | 19.4 | 11.0 | 6.7 | 1.3 |
| Average night temperature (°C) | -6.2 | -5.3 | 1.9 | 4.7 | 9.4 | 14.0 | 18.1 | 18.7 | 16.6 | 7.2 | 3.3 | -2.3 |
| Absolute minimum temperature (°C) | -17.0 | -13.2 | -6.2 | 0.7 | 3.0 | 9.7 | 14.9 | 16.8 | 11.0 | 1.1 | -3.5 | -9.9 |
| 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 | 10.0 |
| Daylight mean duration (h) | 10.2 | 11.0 | 12.0 | 13.0 | 13.9 | 14.4 | 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) | 6.8 | 6.7 | 7.7 | 8.0 | 8.5 | 6.3 | 9.7 | 8.3 | 9.0 | 8.6 | 7.3 | 7.1 |
| Precipitation (mm) | 106 | 84 | 137 | 274 | 305 | 371 | 99 | 396 | 97 | 62 | 86 | 82 |
| Sunny days | 10 | 7 | 16 | 14 | 11 | 8 | 2 | 2 | 2 | 11 | 12 | 14 |
| Rainy days | 8 | 15 | 14 | 16 | 20 | 22 | 29 | 29 | 28 | 20 | 17 | 11 |
| Snow days | 13 | 6 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 6 |
The largest precipitation sum in Niihama Shi is at