Climate averages 1991–2020
Nagaoka weather
in August.
A hot, wet month: the warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Nagaoka: daytime highs average 29.8°C and nights cool to about 21.6°C. By daytime temperature it is the warmest month of the year.
Expect about 146 mm of rain on roughly 14 days, which makes August a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 36 min on an average August day.
The nearest other city in this atlas is Sanjō (21 km away). In August its highs average 29.4°C, about as warm as Nagaoka, with 169 mm of rain.
Among the 303 cities listed in Japan, Nagaoka ranks joint 125th of 303 for the warmest August highs and joint 149th of 303 for the driest August (rainfall, lowest first). The mean August high of those 303 cities is 29.2°C; Nagaoka is 0.6°C warmer than that mean.
From August to September, average highs fall by 4.2°C to 25.6°C, and monthly rainfall falls from 146 mm to 144 mm.
The annual picture
August in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Nagaoka climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 3.8°C-2.5°C | -2.5°C | 179 | 25.1 | 9.910 h |
| February | 4.5°C-2.7°C | -2.7°C | 127 | 20.6 | 10.811 h |
| March | 8.9°C-0.4°C | -0.4°C | 126 | 19.6 | 11.912 h |
| April | 15.7°C4.8°C | 4.8°C | 94 | 14.3 | 13.113 h |
| May | 21.4°C10.6°C | 10.6°C | 94 | 11.9 | 14.214 h |
| June | 25.1°C15.7°C | 15.7°C | 115 | 12.5 | 14.715 h |
| July | 28.1°C20.4°C | 20.4°C | 207 | 16.1 | 14.514 h |
| August, selected | 29.8°C21.6°C | 21.6°C | 146 | 14.1 | 13.614 h |
| September | 25.6°C17.7°C | 17.7°C | 144 | 14.0 | 12.512 h |
| October | 19.5°C11.3°C | 11.3°C | 143 | 14.8 | 11.311 h |
| November | 13.3°C5.3°C | 5.3°C | 145 | 18.2 | 10.210 h |
| December | 7.0°C0.2°C | 0.2°C | 181 | 23.7 | 9.610 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Sanjō in AugustJapan · 21 kmHigh 29.4°C · Low 21.8°C · 169 mm rain
- Tsubame in AugustJapan · 25 kmHigh 28.8°C · Low 22.3°C · 149 mm rain
- Kashiwazaki in AugustJapan · 28 kmHigh 29.6°C · Low 22.0°C · 145 mm rain
- Niigata in AugustJapan · 55 kmHigh 28.3°C · Low 22.7°C · 159 mm rain
- Jōetsu in AugustJapan · 64 kmHigh 29.3°C · Low 22.2°C · 122 mm rain
- Shibata in AugustJapan · 70 kmHigh 28.6°C · Low 21.7°C · 194 mm rain
- Aizu-Wakamatsu in AugustJapan · 97 kmHigh 27.8°C · Low 20.6°C · 132 mm rain
- Nikkō in AugustJapan · 103 kmHigh 26.4°C · Low 19.8°C · 259 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Nagaoka) is explained once on the Nagaoka year overview and on the Sources, method and limits page.