Climate averages 1991–2020
Nagaoka weather
in July.
A hot, very wet month: the 2nd warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
July is a hot month in Nagaoka: daytime highs average 28.1°C and nights cool to about 20.4°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 207 mm of rain on roughly 16 days, which makes July a very wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 14 h 28 min on an average July day.
The nearest other city in this atlas is Sanjō (21 km away). In July its highs average 27.8°C, about as warm as Nagaoka, with 244 mm of rain.
Among the 303 cities listed in Japan, Nagaoka ranks joint 168th of 303 for the warmest July highs and joint 162nd of 303 for the driest July (rainfall, lowest first). The mean July high of those 303 cities is 27.9°C; Nagaoka is 0.3°C warmer than that mean.
From July to August, average highs rise by 1.7°C to 29.8°C, and monthly rainfall falls from 207 mm to 146 mm.
The annual picture
July 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, selected | 28.1°C20.4°C | 20.4°C | 207 | 16.1 | 14.514 h |
| August | 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
July in nearby cities
- Sanjō in JulyJapan · 21 kmHigh 27.8°C · Low 20.4°C · 244 mm rain
- Tsubame in JulyJapan · 25 kmHigh 27.2°C · Low 20.9°C · 214 mm rain
- Kashiwazaki in JulyJapan · 28 kmHigh 28.0°C · Low 20.7°C · 212 mm rain
- Niigata in JulyJapan · 55 kmHigh 26.6°C · Low 21.2°C · 226 mm rain
- Jōetsu in JulyJapan · 64 kmHigh 27.8°C · Low 20.9°C · 191 mm rain
- Shibata in JulyJapan · 70 kmHigh 27.1°C · Low 20.4°C · 274 mm rain
- Aizu-Wakamatsu in JulyJapan · 97 kmHigh 26.6°C · Low 19.3°C · 180 mm rain
- Nikkō in JulyJapan · 103 kmHigh 25.5°C · Low 18.7°C · 305 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.