Annual mean 12°C · wettest around November · prevailing wind SW
Warmest
24.9 °C
Coldest
2.9 °C
Wettest
38%
Windiest
4.4 m/s
Prevailing
SW
3.4 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 Heidelberg over the whole year is 12°C. July is the hottest month, with highs of about 25°C; January is the coldest, with lows of about 2°C. Heidelberg has no sharply defined rainy season: the chance of rain on a given day runs from 26% in August, the driest month, to 34% in November, the wettest. Winds in Heidelberg are highest in February, averaging 3.2 m/s (12 km/h), and lightest in September, at 2.2 m/s (8 km/h). The prevailing wind is from the SW. The clearest skies in Heidelberg come in August, when the sky is typically 49% covered; December is the cloudiest month, at 77%.
Month by month Heidelberg 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
4°C
2°C
-0°C
28%
75%
3.0 m/s
0
0
11
February
7°C
3°C
3°C
29%
68%
3.2 m/s
1
0
23
March
10°C
4°C
6°C
31%
65%
3.0 m/s
5
0
42
April
14°C
7°C
10°C
26%
59%
2.8 m/s
26
0
64
May
18°C
12°C
15°C
33%
55%
2.8 m/s
53
5
75
June
24°C
17°C
22°C
32%
50%
2.6 m/s
73
31
53
July
25°C
18°C
23°C
29%
54%
2.5 m/s
73
32
49
August
25°C
17°C
23°C
26%
49%
2.4 m/s
67
38
44
September
21°C
13°C
19°C
34%
51%
2.2 m/s
68
17
67
October
15°C
9°C
12°C
34%
62%
2.3 m/s
32
0
77
November
8°C
5°C
5°C
34%
73%
2.5 m/s
2
0
35
December
5°C
3°C
1°C
30%
77%
2.8 m/s
0
0
16
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 Heidelberg weather by season
Year round, Heidelberg has days of about 4°C at their warmest in January, its coolest month, and 25°C in July, its warmest; the coolest hours of the day run from 2°C to 18°C through the year, and the average temperature over the year is 12°C around the clock. Rain is most likely around November and least likely around August. 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.
Heidelberg weather in winterDecember to February
High 5°CLow 3°CRain 29%
Winter in Heidelberg has typical daily highs of about 5°C and lows of about 3°C, with a 29% chance of rain on a given day.
Heidelberg weather in springMarch to May
High 14°CLow 8°CRain 30%
Spring in Heidelberg has typical daily highs of about 14°C and lows of about 8°C, with a 30% chance of rain on a given day.
Heidelberg weather in summerJune to August
High 24°CLow 17°CRain 29%
Summer in Heidelberg has typical daily highs of about 24°C and lows of about 17°C, with a 29% chance of rain on a given day.
Heidelberg weather in autumnSeptember to November
High 14°CLow 9°CRain 34%
Autumn in Heidelberg has typical daily highs of about 14°C and lows of about 9°C, with a 34% chance of rain on a given day.
When is the rainy season in Heidelberg?
Heidelberg has no sharply defined rainy season: the chance of rain on a given day runs from 26% in August, the driest month, to 34% in November, the wettest.
What time of year is Heidelberg windiest?
Winds in Heidelberg are highest in February, averaging 3.2 m/s (12 km/h), and lightest in September, at 2.2 m/s (8 km/h). The prevailing wind is from the SW.
What is the average temperature in Heidelberg year round?
The average temperature in Heidelberg over the whole year is 12°C. July is the hottest month, with highs of about 25°C; January is the coldest, with lows of about 2°C.