Climate averages 1991–2020
Nagaoka weather
in April.
A mild, wet month: the 7th warmest and one of the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
April is a mild month in Nagaoka: daytime highs average 15.7°C and nights cool to about 4.8°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 94 mm of rain on roughly 14 days, which makes April a wet month (one of the driest months of the year). Daylight, from sunrise to sunset, lasts about 13 h 08 min on an average April day.
The nearest other city in this atlas is Sanjō (21 km away). In April its highs average 15.5°C, about as warm as Nagaoka, with 116 mm of rain.
Among the 303 cities listed in Japan, Nagaoka ranks joint 242nd of 303 for the warmest April highs and joint 22nd of 303 for the driest April (rainfall, lowest first). The mean April high of those 303 cities is 16.7°C; Nagaoka is 1.0°C cooler than that mean.
From April to May, average highs rise by 5.7°C to 21.4°C, and monthly rainfall stays at 94 mm.
The annual picture
April 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, selected | 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 | 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
April in nearby cities
- Sanjō in AprilJapan · 21 kmHigh 15.5°C · Low 4.9°C · 116 mm rain
- Tsubame in AprilJapan · 25 kmHigh 14.8°C · Low 5.5°C · 91 mm rain
- Kashiwazaki in AprilJapan · 28 kmHigh 15.6°C · Low 5.4°C · 104 mm rain
- Niigata in AprilJapan · 55 kmHigh 14.1°C · Low 6.0°C · 90 mm rain
- Jōetsu in AprilJapan · 64 kmHigh 15.2°C · Low 5.4°C · 97 mm rain
- Shibata in AprilJapan · 70 kmHigh 14.7°C · Low 4.8°C · 115 mm rain
- Aizu-Wakamatsu in AprilJapan · 97 kmHigh 14.0°C · Low 3.8°C · 95 mm rain
- Nikkō in AprilJapan · 103 kmHigh 14.3°C · Low 3.7°C · 137 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.