Where to Go for Great Weather
Japan · Regional climate

Nagano Prefecturewhen to go

Regional slice of Japan with its own temperature profile. Best months here: Jan · May · Jun.

Range
2–27 °C
Compare
−1.1°C vs. Japan mean
Country
Japan
TZ
Asia/Tokyo
Region match
Acceptable

Free-tier default preferences. Tune preferences on the map to reshape this score.

12-month climate · Nagano Prefecture

How the year moves in Nagano Prefecture

Ten years of ERA5, aggregated over Nagano Prefecture itself rather than over Japan as a whole — the same series the month-by-month scores below are built from.

Temperature°C
Temperature · 12-month climatologyNagano Prefecture, Japan. Average daytime high by month in °C. Lowest in January (1.9), highest in August (27.4). Monthly means: 1.9, 3.2, 8.4, 14.3, 19.4, 22.3, 26.2, 27.4, 23.7, 17.1, 11.2, 4.5.
View data table
MonthAverage daytime high (°C)
January1.9
February3.2
March8.4
April14.3
May19.4
June22.3
July26.2
August27.4
September23.7
October17.1
November11.2
December4.5
Rainfallmm
Rainfall · 12-month climatologyNagano Prefecture, Japan. Rainfall by month in mm. Lowest in November (115), highest in July (316). Monthly means: 115, 116, 152, 168, 193, 247, 316, 219, 236, 202, 115, 119.
View data table
MonthRainfall (mm)
January115
February116
March152
April168
May193
June247
July316
August219
September236
October202
November115
December119
Sunshinehr / day
Sunshine · 12-month climatologyNagano Prefecture, Japan. Sunshine hours by month in hr / day. Lowest in October (4.7), highest in March (6.9). Monthly means: 5.9, 6.8, 6.9, 6.9, 6.5, 5.5, 4.9, 5.4, 4.8, 4.7, 5.4, 5.4.
View data table
MonthSunshine hours (hr / day)
January5.9
February6.8
March6.9
April6.9
May6.5
June5.5
July4.9
August5.4
September4.8
October4.7
November5.4
December5.4
What’s open · year round

Things to do in Nagano Prefecture

Opening seasons are checked by hand against the operators and parks themselves, not derived from the climate figures on this page. Last reviewed 2026-08-28. Dates move — confirm before you book.

Month by month · Nagano Prefecture

Pick your window

Other regions · Japan

Nearby and comparable

Safety · 6 governments

What the governments say about Japan

Combined advisory · most-cautious-wins
Exercise normal precautions
Highest level across 6 governments · Advisory last changed
See breakdown by country
AU

Exercise normal precautions

Changed Checked www.smartraveller.gov.au
CA

Exercise normal precautions

Changed Checked travel.gc.ca
DE

Exercise normal precautions

Changed Checked www.auswaertiges-amt.de
UK

Exercise normal precautions

Changed Checked www.gov.uk
US

Exercise normal precautions

Changed Checked travel.state.gov

Parts of Japan carry a higher advisory — up to level 4, "Do not travel". The governments concerned name a region rather than a boundary, so the carve-out is not drawn on the map and is not reflected in the combined level above. Follow the source links for where it applies.

Start free

Plan a trip to Nagano Prefecture.

No card required. Upgrade to Premium whenever you want more depth.

Open the mapTry Premium · €2.99