Climate at a glance · Niigata
Annual mean15°day and night
Precipitation2126 mma year
Warmest monthAugustavg high 31°
Coldest monthJanuaryavg low 1°
Average temperature by month
High · lowJanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation by month
2126 mm a yearJanFebMarAprMayJunJulAugSepOctNovDec
Monthly averages
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high | 6° | 6° | 11° | 15° | 20° | 24° | 29° | 31° | 27° | 20° | 15° | 9° |
| Avg low | 1° | 1° | 4° | 8° | 13° | 18° | 23° | 25° | 21° | 14° | 9° | 4° |
| Precip, mm | 203 | 132 | 125 | 109 | 144 | 137 | 193 | 217 | 217 | 177 | 189 | 283 |
| Wet days | 25 | 20 | 16 | 12 | 14 | 12 | 14 | 14 | 15 | 16 | 18 | 25 |
| Sunshine | 5.4 h | 6.4 h | 7.6 h | 8.6 h | 8.9 h | 9.8 h | 10.6 h | 10.1 h | 8.6 h | 7.2 h | 6.6 h | 4.7 h |
| Humidity | 72% | 69% | 69% | 73% | 75% | 80% | 80% | 77% | 76% | 73% | 71% | 72% |
| Sea temperature | 11° | 9° | 10° | 12° | 16° | 21° | 28° | 29° | 28° | 23° | 18° | 14° |
| Daylight | 9 h 52 | 10 h 47 | 11 h 58 | 13 h 11 | 14 h 13 | 14 h 45 | 14 h 30 | 13 h 36 | 12 h 26 | 11 h 13 | 10 h 09 | 9 h 35 |
| UV index (clear sky) | 3 | 5 | 7 | 9 | 11 | 11 | 11 | 10 | 8 | 6 | 4 | 3 |
5-year averages (2021–2025) · Open-Meteo historical weather (ERA5)
37.9230°N, 139.0410°E