Climate at a glance · Niigata
Annual mean59°day and night
Precipitation83.70 ina year
Warmest monthAugustavg high 88°
Coldest monthJanuaryavg low 34°
Average temperature by month
High · lowJanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation by month
83.70 in a yearJanFebMarAprMayJunJulAugSepOctNovDec
Monthly averages
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high | 43° | 43° | 52° | 59° | 68° | 75° | 84° | 88° | 81° | 68° | 59° | 48° |
| Avg low | 34° | 34° | 39° | 46° | 55° | 64° | 73° | 77° | 70° | 57° | 48° | 39° |
| Precip, in | 7.99 | 5.20 | 4.92 | 4.29 | 5.67 | 5.39 | 7.60 | 8.54 | 8.54 | 6.97 | 7.44 | 11.14 |
| 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 | 52° | 49° | 50° | 53° | 60° | 70° | 82° | 85° | 83° | 74° | 64° | 57° |
| 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