Japan · 1991–2020

Best time to visit
Nagano

For Nagano, May has the most comfortable weather in our climate comparison. Typical daytime highs are 23.1°C, nights average 10.3°C, and rainfall totals about 75 mm. Figures use measured 1991–2020 normals from the nearest eligible NOAA station.

Best all-round monthMay

Typical daytime high23.1°C

Typical night-time low10.3°C

May rainfall75 mm

Overall comfort

May

Other strong months: June and September

78/100 weather score

Outdoor sightseeing

May

Other strong months: October and April

77/100 weather score

Make the answer personal

Choose the weather
that suits you.

Set the daytime temperature and rainfall you are comfortable with. We will show only the months that meet every choice, using the measured 1991–2020 averages below.

Daytime high: at least 18°CDaytime high: at most 28°CMonthly rain: no more than 100 mmWet days: no more than 10

1 month fits your choices for Nagano

May23.1°C day · 75 mm rain · 8.4 wet days

The lowest comfort score is 5 out of 100. January, February and December share that score. In January, that is mainly because days reach only 3.8°C, 20° below the 24°C the score treats as ideal.

Quick answers

Planning a trip to Nagano?

These answers come from the same measured monthly climate record shown on this page.

When is the best time to visit Nagano?

May is the strongest all-round choice in our temperature-and-rainfall comparison, with a typical daytime high of 23.1°C and 75 mm of rain.

What is the hottest month in Nagano?

August is hottest in this record, with a typical daytime high of 31.2°C and a night-time low of 21.2°C.

Which month has the least rain?

November has the lowest monthly rainfall total at 47 mm.

Is this a weather forecast?

No. These are long-term measured averages from 1991–2020. Check a current forecast before you travel.

Month by month

See how the weather
changes through the year.

The bars combine daytime temperature, night-time temperature and rainfall. The figures are measured historical averages, not a forecast for a particular trip.

53.8° / -4.6°

55.3° / -4.2°

1310.4° / -1.2°

4917.5° / 4.2°

7823.1° / 10.3°

7526° / 15.6°

4629.8° / 20.2°

4831.2° / 21.2°

6826.2° / 16.9°

5919.6° / 9.6°

3713.4° / 2.6°

57° / -2°

Monthly climate evidence for Nagano — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	3.8°C	-4.6°C	74 mm	12.7	9 h 54	5	Good coverage
February	5.3°C	-4.2°C	62 mm	10.4	10 h 47	5	Good coverage
March	10.4°C	-1.2°C	70 mm	11.4	11 h 51	13	Good coverage
April	17.5°C	4.2°C	67 mm	8.9	13 h 05	49	Good coverage
May	23.1°C	10.3°C	75 mm	8.4	14 h 06	78	Good coverage
June	26°C	15.6°C	110 mm	10.5	14 h 39	75	Good coverage
July	29.8°C	20.2°C	145 mm	14	14 h 26	46	Good coverage
August	31.2°C	21.2°C	117 mm	9.7	13 h 33	48	Good coverage
September	26.2°C	16.9°C	141 mm	9.7	12 h 22	68	Good coverage
October	19.6°C	9.6°C	122 mm	8.2	11 h 11	59	Good coverage
November	13.4°C	2.6°C	47 mm	7.2	10 h 10	37	Good coverage
December	7°C	-2°C	56 mm	10.5	9 h 40	5	Good coverage

Records at NAGANO, 1951–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	17.7°C5 Jan 1960	-15.0°C17 Jan 1967	43 mm7 Jan 1963	156 mm2002 · driest 0 mm in 2026	75
February	21.5°C27 Feb 1954	-13.7°C3 Feb 1954	40 mm15 Feb 2014	97 mm1989 · driest 0 mm in 2026	75
March	27.6°C27 Mar 2025	-10.9°C2 Mar 1957	32 mm9 Mar 2018	108 mm1966 · driest 0 mm in 2026	75
April	30.6°C22 Apr 2004	-4.9°C2 Apr 1957	60 mm9 Apr 2024	127 mm1998 · driest 0 mm in 2025	75
May	34.2°C27 May 2019	-0.7°C4 May 1957	68 mm28 May 2024	189 mm2011 · driest 0 mm in 2025	75
June	35.9°C25 Jun 2022	6.1°C1 Jun 1978	82 mm25 Jun 1996	273 mm1961 · driest 0 mm in 2025	75
July	36.9°C23 Jul 2000	10.7°C1 Jul 1967	228 mm30 Jul 1994	328 mm2020 · driest 0 mm in 2025	75
August	38.7°C16 Aug 1994	10.7°C20 Aug 1956	93 mm12 Aug 2017	232 mm2013 · driest 0 mm in 2025	73
September	36.3°C1 Sep 2002	5.5°C29 Sep 1960	115 mm12 Sep 1982	249 mm2018 · driest 0 mm in 2025	73
October	31.7°C6 Oct 1961	-1.9°C31 Oct 1983	119 mm21 Oct 2004	319 mm2004 · driest 0 mm in 2025	74
November	26.2°C1 Nov 1977	-11.4°C29 Nov 1951	60 mm2 Nov 2024	125 mm1951 · driest 0 mm in 2025	74
December	22.0°C4 Dec 2018	-11.2°C30 Dec 1976	55 mm27 Dec 2006	119 mm1980 · driest 0 mm in 2025	74

Typical days per month at NAGANO, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	15	1
February	0	0	14	1
March	0	0	12	2
April	2	<1	2	2
May	11	1	0	2
June	18	3	0	3
July	26	15	0	4
August	28	20	0	3
September	17	6	0	4
October	2	<1	0	3
November	0	0	4	1
December	0	0	12	1

How often different weather occurs at NAGANO, based on its daily record
Month	Dry days reaching 20°C	Wet days	Days with heavy rain	Weeks with 3+ wet days	Typical high by year
January	0%	35%	4%	39%	1.6–5.3°C
February	<1%	34%	5%	38%	2.6–7.1°C
March	2%	32%	6%	34%	7.6–11.4°C
April	25%	31%	9%	31%	15.6–19.4°C
May	54%	31%	9%	32%	21.1–24.3°C
June	59%	39%	15%	52%	24.0–26.7°C
July	59%	42%	16%	49%	27.1–31.4°C
August	69%	31%	12%	37%	28.8–32.6°C
September	61%	36%	15%	45%	23.6–27.8°C
October	30%	28%	10%	24%	17.7–20.5°C
November	2%	25%	5%	23%	11.6–14.5°C
December	0%	28%	4%	29%	5.1–8.3°C

A dry day reaching 20°C records under 1 mm of rain. A wet day records at least 1 mm, while a heavy-rain day records at least 10 mm. The weekly figure is the share of seven-day periods containing three or more wet days. The final column shows the middle 80% of average daytime highs recorded for that month in individual years; a wider range means conditions have varied more from one year to another.

1951Each stripe is one year’s mean temperature against the 43-year average. Warmest: 2025. Coolest: 1981.2025

The evidence behind this page

Where these figures
come from.

Place identity: GeoNames 1856215
NOAA station: JA000047610 · NAGANO
Station distance: 2.4 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 16 usable years
Daylight: Calculated from latitude 36.65°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Important limit: Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.

Next step

Choose your month.
Then plan the details.

The weather comparison for Nagano is based on climate evidence, not payments from travel companies. Flight, accommodation and activity links will be clearly labelled when they are added; there are no booking offers on this page today.

How travel partnerships will work

Keep exploring

Same climate evidence,
different places.

These places read the same station, so their climate numbers are identical. Their setting, population and distance from NAGANO are not.

NaganoChikumaMay is the strongest comfort month on this shared record · population 59,381Explore the year NaganoSuzakaMay is the strongest comfort month on this shared record · population 54,022Explore the year NaganoNakanoMay is the strongest comfort month on this shared record · population 42,664Explore the year NaganoIiyamaMay is the strongest comfort month on this shared record · population 20,118Explore the year NaganoSakakiMay is the strongest comfort month on this shared record · population 15,025Explore the year NaganoHiraoMay is the strongest comfort month on this shared record · population 11,352Explore the year

Or put two places side by side: Nagano vs Chikuma

Best time to visitNagano

May

May

Choose the weatherthat suits you.