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Nagaoka Weather by Month
Average temperatures, rainfall and humidity for Nagaoka, Japan, month by month, built from OpenWeather's historical records. Use it to see what a typical Nagaoka month looks like before you travel — then check the live Nagaoka forecast for the days ahead.
Warmest month
August
31°C average high
Coolest month
February
-1°C average low
Wettest month
December
142 mm of rain
Driest month
February
79 mm of rain
Average temperature and rainfall in Nagaoka by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 5°C | 0°C | -13°C / 16°C | 96 mm | 88% | 13 km/h |
| February | 6°C | -1°C | -12°C / 20°C | 79 mm | 84% | 13 km/h |
| March | 11°C | 1°C | -12°C / 25°C | 115 mm | 78% | 11 km/h |
| April | 16°C | 6°C | -5°C / 31°C | 113 mm | 74% | 10 km/h |
| May | 22°C | 12°C | 2°C / 33°C | 84 mm | 75% | 8 km/h |
| June | 26°C | 16°C | 5°C / 36°C | 97 mm | 81% | 8 km/h |
| July | 29°C | 21°C | 14°C / 38°C | 132 mm | 85% | 8 km/h |
| August | 31°C | 22°C | 13°C / 40°C | 106 mm | 83% | 7 km/h |
| September | 27°C | 18°C | 7°C / 39°C | 99 mm | 83% | 8 km/h |
| October | 19°C | 11°C | 0°C / 31°C | 111 mm | 85% | 9 km/h |
| November | 14°C | 6°C | -7°C / 27°C | 119 mm | 84% | 11 km/h |
| December | 8°C | 2°C | -10°C / 20°C | 142 mm | 87% | 13 km/h |
Best time to visit Nagaoka
The most comfortable time to visit Nagaoka is generally May to June and September, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around December, totalling about 1293 mm a year.
Travellers who prefer heat should aim for August, when highs average 31°C. December is the month to avoid if rain would spoil your plans — it averages 142 mm, roughly 2× the rainfall of February.
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Nagaoka forecast for what is happening now.