Annual mean 13°C · wettest around July · prevailing wind NW
Warmest
30.2 °C
Coldest
2.8 °C
Wettest
35%
Windiest
4.0 m/s
Prevailing
NW
3.2 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Nagano over the whole year is 13°C. August is the hottest month, with highs of about 29°C; January is the coldest, with lows of about -2°C. Nagano has no sharply defined rainy season: the chance of rain on a given day runs from 14% in November, the driest month, to 23% in July, the wettest. Winds in Nagano are highest in April, averaging 2.9 m/s (10 km/h), and lightest in July, at 2.2 m/s (8 km/h). The prevailing wind is from the NW. The clearest skies in Nagano come in November, when the sky is typically 61% covered; September is the cloudiest month, at 79%.
Month by month Nagano climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
3°C
-2°C
-1°C
20%
62%
2.5 m/s
0
0
6
February
4°C
-2°C
-0°C
18%
64%
2.7 m/s
0
0
10
March
9°C
2°C
5°C
17%
63%
2.8 m/s
6
0
38
April
15°C
7°C
11°C
16%
65%
2.9 m/s
31
1
70
May
20°C
13°C
18°C
15%
68%
2.8 m/s
70
9
74
June
24°C
17°C
23°C
19%
75%
2.4 m/s
71
36
43
July
28°C
22°C
30°C
23%
76%
2.2 m/s
28
55
8
August
29°C
23°C
31°C
17%
73%
2.3 m/s
20
53
5
September
25°C
19°C
25°C
21%
79%
2.2 m/s
58
44
31
October
18°C
12°C
16°C
18%
72%
2.3 m/s
56
9
74
November
12°C
6°C
9°C
14%
61%
2.4 m/s
18
0
63
December
6°C
1°C
2°C
19%
62%
2.5 m/s
1
0
18
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Nagano weather by season
Year round, Nagano has days of about 3°C at their warmest in January, its coolest month, and 29°C in August, its warmest; the coolest hours of the day run from -2°C to 23°C through the year, and the average temperature over the year is 13°C around the clock. Rain is most likely around July and least likely around November. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Nagano weather in winterDecember to February
High 5°CLow -1°CRain 19%
Winter in Nagano has typical daily highs of about 5°C and lows of about -1°C, with a 19% chance of rain on a given day.
Nagano weather in springMarch to May
High 15°CLow 8°CRain 16%
Spring in Nagano has typical daily highs of about 15°C and lows of about 8°C, with a 16% chance of rain on a given day.
Nagano weather in summerJune to August
High 27°CLow 21°CRain 20%
Summer in Nagano has typical daily highs of about 27°C and lows of about 21°C, with a 20% chance of rain on a given day.
Nagano weather in autumnSeptember to November
High 18°CLow 12°CRain 18%
Autumn in Nagano has typical daily highs of about 18°C and lows of about 12°C, with a 18% chance of rain on a given day.
When is the rainy season in Nagano?
Nagano has no sharply defined rainy season: the chance of rain on a given day runs from 14% in November, the driest month, to 23% in July, the wettest.
What time of year is Nagano windiest?
Winds in Nagano are highest in April, averaging 2.9 m/s (10 km/h), and lightest in July, at 2.2 m/s (8 km/h). The prevailing wind is from the NW.
What is the average temperature in Nagano year round?
The average temperature in Nagano over the whole year is 13°C. August is the hottest month, with highs of about 29°C; January is the coldest, with lows of about -2°C.