Nagano Climate by Month
Nagano, Japan
Hot summers and cold winters, with rain spread through the year.
The climate in Nagano is one of hot summers and cold winters, with rain spread through the year. Expect highs of 89°F (31°C) in August and 41°F (5°C) in January, with the coldest nights (January) near 25°F (-4°C). It gets 43 in (1081 mm) of rain a year, spread across the months.
- Warmest month
- 89°F(31°C)
- Average high, August
- Coldest nights
- 25°F(-4°C)
- Average low, January
- Rain per year
- 43 in(1081 mm)
- No clear rainy season
- Humidity
- 64%
- Sunniest: May
Best and worst months in Nagano
Best for weatherThe most comfortable weather comes in May, with highs around 74°F (24°C) and about 3.1 in (79 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 41°F (5°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in May.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Nagano weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 41°F(5°C) | 25°F(-4°C) | 3.2 in(81 mm) | 62% | 2.1 |
| FebFebruary | 43°F(6°C) | 26°F(-4°C) | 2.6 in(66 mm) | 60% | 2.8 |
| MarMarch | 51°F(11°C) | 31°F(-1°C) | 3.0 in(77 mm) | 57% | 3.7 |
| AprApril | 65°F(18°C) | 42°F(6°C) | 2.8 in(71 mm) | 58% | 4.5 |
| MayMayBest | 74°F(24°C) | 52°F(11°C) | 3.1 in(79 mm) | 56% | 5.2 |
| JunJune | 79°F(26°C) | 61°F(16°C) | 4.3 in(108 mm) | 68% | 4.8 |
| JulJuly | 86°F(30°C) | 69°F(20°C) | 5.4 in(137 mm) | 69% | 4.7 |
| AugAugust | 89°F(31°C) | 70°F(21°C) | 3.5 in(90 mm) | 67% | 5.0 |
| SepSeptember | 79°F(26°C) | 63°F(17°C) | 4.7 in(120 mm) | 70% | 3.8 |
| OctOctober | 68°F(20°C) | 51°F(10°C) | 4.5 in(115 mm) | 70% | 2.9 |
| NovNovember | 57°F(14°C) | 39°F(4°C) | 2.6 in(66 mm) | 71% | 2.2 |
| DecDecember | 46°F(8°C) | 30°F(-1°C) | 2.8 in(71 mm) | 64% | 1.8 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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