SeasonMapNagano weather by month
Japan
The best time to visit Nagano is April to June — 86/100 in May, 24°C and 15 rainy days. The best season is spring, March to May (77/100 on average).
The worst month is January at 47/100 — cold, rainy, clean air. See January →
Updated September 2026 · climate normals from ERA5 reanalysis
Planning the wider trip? Best time to visit Japan →
Nagano, month by month
Comfort score out of 100 for the kind of trip Nagano is best for, the average high, rainy days and hours of sun a day from the climate normals, and how busy it tends to be.
| Month | Score | Tier | High | Rain | Sun | Crowds | On |
|---|---|---|---|---|---|---|---|
| JanJanuary | 47 | F | 5°C | 23 d | 7 h | Peak | 2 |
| FebFebruary | 55 | D | 6°C | 18 d | 8 h | Peak | 2 |
| MarMarch | 66 | C | 12°C | 16 d | 8 h | Peak | 2 |
| AprApril | 78 | B | 18°C | 15 d | 9 h | Peak | 3 |
| MayMay | 86 | A | 24°C | 15 d | 9 h | Peak | 1 |
| JunJune | 79 | B | 27°C | 17 d | 9 h | Busy | — |
| JulJuly | 56 | D | 31°C | 24 d | 9 h | Busy | — |
| AugAugust | 60 | C | 32°C | 22 d | 10 h | Busy | — |
| SepSeptember | 71 | B | 27°C | 18 d | 8 h | Shoulder | — |
| OctOctober | 75 | B | 20°C | 17 d | 7 h | Busy | 1 |
| NovNovember | 70 | B | 14°C | 16 d | 7 h | Busy | 1 |
| DecDecember | 53 | D | 8°C | 21 d | 7 h | Peak | 2 |
What's on in Nagano through the year
Festivals, natural spectacles, holidays and the seasons to watch out for — curated and sourced. The month pages carry the detail.
Crowds in Nagano in May
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Peak crowdsGolden Week, Golden Week in Japan(estimated)
Peak crowdsBusyShoulder seasonQuiet