Annual mean 10°C · wettest around December · prevailing wind W
Warmest
23.0 °C
Coldest
0.8 °C
Wettest
37%
Windiest
3.1 m/s
Prevailing
W
2.5 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
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 Aarau over the whole year is 10°C. July is the hottest month, with highs of about 23°C; January is the coldest, with lows of about 0°C. Aarau has no sharply defined rainy season: the chance of rain on a given day runs from 20% in September, the driest month, to 32% in December, the wettest. Winds in Aarau are highest in January, averaging 2.5 m/s (9 km/h), and lightest in September, at 1.6 m/s (6 km/h). The prevailing wind is from the W. The clearest skies in Aarau come in August, when the sky is typically 58% covered; December is the cloudiest month, at 84%.
Month by month Aarau 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
2°C
0°C
-2°C
29%
80%
2.5 m/s
0
0
8
February
5°C
2°C
1°C
25%
71%
2.5 m/s
0
0
18
March
9°C
3°C
4°C
27%
65%
2.3 m/s
3
0
36
April
13°C
5°C
9°C
23%
64%
2.1 m/s
25
0
61
May
16°C
9°C
13°C
29%
69%
2.0 m/s
44
3
73
June
22°C
14°C
20°C
24%
60%
1.8 m/s
71
24
58
July
23°C
15°C
22°C
22%
58%
1.7 m/s
72
33
48
August
23°C
15°C
22°C
20%
58%
1.7 m/s
65
39
46
September
18°C
12°C
17°C
20%
59%
1.6 m/s
64
14
70
October
13°C
8°C
11°C
21%
67%
1.8 m/s
31
0
75
November
6°C
4°C
3°C
29%
80%
2.1 m/s
1
0
26
December
3°C
2°C
-0°C
32%
84%
2.4 m/s
0
0
9
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 Aarau weather by season
Year round, Aarau has days of about 2°C at their warmest in January, its coolest month, and 23°C in July, its warmest; the coolest hours of the day run from 0°C to 15°C through the year, and the average temperature over the year is 10°C around the clock. Rain is most likely around December and least likely around September. 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.
Aarau weather in winterDecember to February
High 4°CLow 1°CRain 29%
Winter in Aarau has typical daily highs of about 4°C and lows of about 1°C, with a 29% chance of rain on a given day.
Aarau weather in springMarch to May
High 12°CLow 6°CRain 26%
Spring in Aarau has typical daily highs of about 12°C and lows of about 6°C, with a 26% chance of rain on a given day.
Aarau weather in summerJune to August
High 22°CLow 15°CRain 22%
Summer in Aarau has typical daily highs of about 22°C and lows of about 15°C, with a 22% chance of rain on a given day.
Aarau weather in autumnSeptember to November
High 12°CLow 8°CRain 23%
Autumn in Aarau has typical daily highs of about 12°C and lows of about 8°C, with a 23% chance of rain on a given day.
When is the rainy season in Aarau?
Aarau has no sharply defined rainy season: the chance of rain on a given day runs from 20% in September, the driest month, to 32% in December, the wettest.
What time of year is Aarau windiest?
Winds in Aarau are highest in January, averaging 2.5 m/s (9 km/h), and lightest in September, at 1.6 m/s (6 km/h). The prevailing wind is from the W.
What is the average temperature in Aarau year round?
The average temperature in Aarau over the whole year is 10°C. July is the hottest month, with highs of about 23°C; January is the coldest, with lows of about 0°C.