Heidelberg climate — normals and trends
Heidelberg (South Africa) has a subtropical highland, dry winter climate (Cwb) under the Köppen-Geiger classification. Its mean annual temperature is 15.9 °C and it receives 785 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is January (20.0 °C on average) and the coldest is June (9.3 °C). Rainfall peaks in December.
Heidelberg averages 8 frost days, 14 hot days (≥ 30 °C) and 109 rainy days per year.
Heidelberg has warmed by +1.4 °C between 1940 and 2025, or +0.17 °C per decade. This trend is statistically significant.
The hottest day of the period reached 37.6 °C (on 6 January 2016) and the coldest -4.9 °C (on 19 July 1995).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
HeidelbergGauteng
- coords
- -26.50°, 28.36°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
15.9°C
Average daily high
22.8°C
Average daily low
10.4°C
Annual rainfall
785mm
Sunshine / day
10.7h
Mean relative humidity
61%
Average peak wind
17.4km/h
Seasonal range
10.7°C
Frost days (< 0 °C)
8 d/yr
Hot days (≥ 30 °C)
14 d/yr
Rainy days (≥ 1 mm)
109 d/yr
Annual snowfall
0.3 cm
Average feels-like high
21.7 °C
Average feels-like low
8.3 °C
Average peak gust
35.8 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
20.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.4 °C
since 1940
+0.2 °C per decade · r² = 0.36 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
37.6 °C
6 January 2016
Coldest day
-4.9 °C
19 July 1995
Wettest day
80 mm
16 October 1943
Windiest day
47.0 km/h
23 September 1941
Strongest gust
99.7 km/h
9 November 1940
Hottest feels-like
37.1 °C
6 January 2016
Coldest feels-like
-9.3 °C
19 July 1995
Snowiest day
11.6 cm
10 September 1981
Sunniest day
13.7 h
15 December 1940
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 26.6 °C | +1.0 °C | 228 mm | +92 mm |
| Feb | 25.4 °C | +0.2 °C | 234 mm | +124 mm |
| Mar | 24.4 °C | +0.1 °C | 157 mm | +73 mm |
| Apr | 21.0 °C | -1.1 °C | 137 mm | +83 mm |
| May | 20.4 °C | +0.5 °C | 7 mm | -10 mm |
| Jun | 18.1 °C | +0.7 °C | 1 mm | -7 mm |
| Jul | 18.3 °C | +0.6 °C | 7 mm | +3 mm |
| Aug | 22.9 °C | +2.2 °C | 18 mm | +8 mm |
| Sep | 25.5 °C | +1.2 °C | 54 mm | +28 mm |
| Oct | 25.3 °C | -0.2 °C | 84 mm | +5 mm |
| Nov | 22.7 °C | -2.5 °C | 176 mm | +60 mm |
| Dec | 24.7 °C | -0.8 °C | 171 mm | +29 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Heidelberg?
Heidelberg has a subtropical highland, dry winter climate (Köppen Cwb). Over 1940-2025, the average annual temperature is 15.9 °C and it receives 785 mm of precipitation per year.
What is the hottest day ever recorded in Heidelberg?
The hottest day measured in Heidelberg between 1940 and 2025 was 6 January 2016, reaching 37.6 °C.
What is the coldest day in Heidelberg?
The coldest day measured in Heidelberg between 1940 and 2025 was 19 July 1995, at -4.9 °C.
Does it snow in Heidelberg?
Almost never: Heidelberg sees virtually no snow, with about 8 frost days per year.
Has the climate of Heidelberg warmed?
Yes: Heidelberg warmed by +1.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Heidelberg?
The wettest day measured in Heidelberg between 1940 and 2025 was 16 October 1943, with 80 mm of rain in 24 hours.
What was the windiest day in Heidelberg?
The windiest day measured in Heidelberg between 1940 and 2025 was 23 September 1941, with winds reaching 47.0 km/h.
What is the warmest month in Heidelberg?
The warmest month in Heidelberg is January (20.0 °C on average); the coldest is June (9.3 °C).
How much does it rain in Heidelberg?
Heidelberg receives on average 785 mm of precipitation per year, spread over about 109 rainy days.
Is it sunny in Heidelberg?
Heidelberg gets on average 10.7 hours of sunshine per day, roughly 3,905 hours per year over 1940-2025.
What is the biggest single-day snowfall in Heidelberg?
The heaviest 24-hour snowfall measured in Heidelberg between 1940 and 2025 was 10 September 1981, with 11.6 cm.
Are there tropical nights in Heidelberg?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Heidelberg.
What was the most extreme apparent temperature in Heidelberg?
In Heidelberg, between 1940 and 2025, the highest apparent temperature reached 37.1 °C on 6 January 2016, and the lowest was -9.3 °C on 19 July 1995.
Compare Heidelberg with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Heidelberg