Climate averages 1991–2020
Nagaoka weather
in May.
A mild, wet month: the 5th warmest and one of the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Nagaoka: daytime highs average 21.4°C and nights cool to about 10.6°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 94 mm of rain on roughly 12 days, which makes May a wet month (one of the driest months of the year). Daylight, from sunrise to sunset, lasts about 14 h 10 min on an average May day.
The nearest other city in this atlas is Sanjō (21 km away). In May its highs average 21.1°C, about as warm as Nagaoka, with 116 mm of rain.
Among the 303 cities listed in Japan, Nagaoka ranks joint 180th of 303 for the warmest May highs and joint 11th of 303 for the driest May (rainfall, lowest first). The mean May high of those 303 cities is 21.3°C; Nagaoka is 0.1°C warmer than that mean.
From May to June, average highs rise by 3.7°C to 25.1°C, and monthly rainfall rises from 94 mm to 115 mm.
The annual picture
May 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, selected | 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 | 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
May in nearby cities
- Sanjō in MayJapan · 21 kmHigh 21.1°C · Low 10.6°C · 116 mm rain
- Tsubame in MayJapan · 25 kmHigh 20.3°C · Low 11.0°C · 96 mm rain
- Kashiwazaki in MayJapan · 28 kmHigh 21.2°C · Low 11.1°C · 104 mm rain
- Niigata in MayJapan · 55 kmHigh 19.4°C · Low 11.4°C · 99 mm rain
- Jōetsu in MayJapan · 64 kmHigh 21.0°C · Low 11.5°C · 92 mm rain
- Shibata in MayJapan · 70 kmHigh 20.3°C · Low 10.5°C · 123 mm rain
- Aizu-Wakamatsu in MayJapan · 97 kmHigh 20.0°C · Low 9.8°C · 95 mm rain
- Nikkō in MayJapan · 103 kmHigh 19.1°C · Low 9.4°C · 176 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.