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Nagano weather

Nagano · 372,760 inhabitants · Friday, October 30 · updated 03:59

Air: Good

10°

Partly cloudy

Feels like 10°C

Wind

5 km/h

Gusts

16 km/h

Humidity

66 %

Pressure

1020 hPa

Clouds

69 %

Storm

Rise 06:08 Set 16:53 Day 10 h 44 min UV 3 · Moderate

Morning, afternoon, evening

Trend

Night

Partly cloudy

10°9°

Feels like 10°

Wind ↑ SSE 7 km/h

Gusts 16 km/h

Humidity 66 %

Morning

Rain showers

12°8°

Feels like 12°

Wind ↑ S 10 km/h

Gusts 33 km/h

Humidity 69 %

💧 0.4 mm

Afternoon

Rain showers

15°14°

Feels like 15°

Wind ↑ SW 11 km/h

Gusts 23 km/h

Humidity 74 %

💧 0.7 mm

Evening

Clear sky

12°11°

Feels like 12°

Wind ↑ SW 7 km/h

Gusts 13 km/h

Humidity 85 %

💧 0.2 mm

09:00

12°

0.4mm

S 5

12:00

14°

0.2mm

SW 11

15:00

15°

0.5mm

S 2

18:00

11°

0.1mm

SW 7

21:00

12°

0.1mm

S 2

00:00

9°

SW 3

03:00

10°

0.1mm

N 2

06:00

9°

0.3mm

NNW 1

Nagano forecast in charts · next 7 days

The week ahead: highs and lows

▲ This week runs +1.8° warmer than usual

Highs Lows Usual for the season (1991–2020 average)

Hourly detail

Temperature (°C) Rain (mm) Wind (km/h)

Nagano climate: what a normal year looks like

The hottest stretch is August, when afternoons average 28 °C; the coldest is January, when nights average −6 °C. Between those two months the average temperature changes by 26 °C.

Nights typically freeze from December to March, the coldest averaging −6 °C in January.

A normal year brings roughly 2,070 mm of rain — more than 89% of the towns of 20,000+ people we compared it with.

There is no real dry season: monthly rainfall stays between 129 mm and 273 mm on average.

Forecast highs for the coming week average 14 °C, 3 °C cooler than a normal October (17 °C).

30-year averages (1991–2020)
Month	Typical high	Typical low	Rainfall
Jan	1 °C	−6 °C	155 mm
Feb	3 °C	−5 °C	132 mm
Mar	6 °C	−2 °C	151 mm
Apr	13 °C	3 °C	130 mm
May	20 °C	9 °C	153 mm
Jun	22 °C	14 °C	216 mm
Jul	26 °C	18 °C	273 mm
Aug	28 °C	19 °C	194 mm
Sep	23 °C	15 °C	211 mm
Oct	17 °C	9 °C	182 mm
Nov	11 °C	3 °C	129 mm
Dec	5 °C	−3 °C	148 mm
Whole year	14 °C	6 °C	2,070 mm

Source: our own processing of the ERA5 reanalysis (Copernicus/ECMWF) for 36.65° N, 138.18° E, 1991–2020. ERA5 averages over a 0.25° grid (about 25 km): hills, a coastline or the heat of the city itself can shift local values by a degree or two.

Air you breathe in Nagano: pollution and pollen

1/6

Good

European Air Quality Index (EAQI), from Copernicus CAMS

PM2.51µg/m³

PM101µg/m³

Copernicus CAMS model, updated several times a day.

Rain radar around Nagano

Rain observed over the last two hours by official weather radars around Nagano, followed by the radar forecast for the next hour where the weather service provides one.

Full-screen rain radar and next-hour rain on RainAtlas

Rain radar Last two hours, then forecast where available · drag the timeline

No open weather radar covers Nagano yet: the map shows our hour-by-hour rain forecast (ICON, GFS).

Moon over Nagano

Waning gibbous

79 % illuminated · 19.3 days

Rise 15:02 Set 05:38

Sat 31/10 69%

Sun 1/11 59%

Mon 2/11 49% Last quarter

Tue 3/11 38%

Wed 4/11 28%

Thu 5/11 19%

Fri 6/11 12%

Sat 7/11 6%

Sun 8/11 2%

Mon 9/11 0%

Tue 10/11 1% New moon

Wed 11/11 3%

Moonrise and moonset in local time (Asia/Tokyo); phase and lit fraction from a synodic calculation.

Look up a past day in Nagano

Curious about the weather in Nagano on a given day? Choose a date: we read it from the ERA5 reanalysis (ECMWF / Copernicus C3S), which runs until about a week ago.

Nagano weather at a glance

This page gathers everything about the weather in Nagano, Nagano: conditions now, the forecast for each part of the day and the trend for the coming week. At the moment the sky is “partly cloudy”, it is 10 °C (feels like 10 °C) and the wind blows at 5 km/h.

Expected range today: 9 °C to 15 °C and around 2 mm of rain. The forecast comes from the AtmoAtlas engine, which combines ECMWF-AIFS, NOAA GFS and DWD ICON, adjusts cloud cover with METAR reports and uses convective energy (CAPE) to flag storms.

Other big cities nearby

Tokorozawa 149 km 10°

Hachiōji 151 km 10°

Utsunomiya 152 km 10°

Nagano weather data for developers

Use the Nagano forecast in your own website or app: one JSON call returns weather, air quality, tides and sun and moon times. The free key needs no card.

Create a free key

Where does this forecast come from? Our engine, checked every day against 1125 weather stations