Heidelberg weather in August

In August, Heidelberg sees average daytime highs of 21°C and overnight lows near 6°C, with 11 mm of rain across 2.1 wet days and about 11.1 hours of daylight. It is the 9th-warmest and 10th-wettest month of the year here.

Highs climb over the month, from about 20°C in the first days to 23°C by the end. The sky is clear or mostly clear about 82% of the time in August, and the air most often feels dry.

Daylight stretches from about 10 h 42 min at the start of August to 11 h 24 min by month's end. Set against the rest of the year, August is Heidelberg's 3rd-clearest and 4th-windiest month. For the whole year in context, see Heidelberg's year-round climate.

Daytime high: 21°; 9th warmest
Overnight low: 6°; 3rd coldest
Rainfall: 11 mm; 2.1 wet days
Daylight: 11 h 06 min; 6:39 AM – 5:42 PM
Cloud cover: 18%; 3rd clearest
Wind: 12 km/h; 4th windiest
Solar energy: 4.97 kWh/m²
Travel score: 8.6; out of 10

Heidelberg is town in Gauteng province, South Africa.

Founded: 1886

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← July Heidelberg year-round climate September →Best places to visit in August

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 20°C in the first days to 23°C by the end.

A typical August day in Heidelberg reaches about 21°C in the afternoon and slips back to 6°C overnight — a 15°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 25°C. Set against its neighbours, August runs about 3°C warmer than July and about 4°C cooler than September.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Avg high (°C)	20	20	20	20	20	20	20	20	20	21	21	21	21	21	21	21	21	21	22	22	22	22	22	22	22	23	23	23	23	23	23
Avg low (°C)	4	4	5	5	5	5	5	5	5	5	6	6	6	6	6	6	6	6	7	7	7	7	7	7	7	8	8	8	8	8	8

	Avg high (°C)	Avg low (°C)
1	20	4
2	20	4
3	20	5
4	20	5
5	20	5
6	20	5
7	20	5
8	20	5
9	20	5
10	21	5
11	21	6
12	21	6
13	21	6
14	21	6
15	21	6
16	21	6
17	21	6
18	21	6
19	22	7
20	22	7
21	22	7
22	22	7
23	22	7
24	22	7
25	22	7
26	23	8
27	23	8
28	23	8
29	23	8
30	23	8
31	23	8

How August really feels in Heidelberg

Once humidity and wind are folded in, August averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C

heat index over the day's high

Days feeling ≤ 0°C

wind chill below the day's low

August sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Heidelberg weather by month

How August compares with the rest of the year at a glance. August is the 9th-warmest and 10th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	26° / 16°	129	16	13.5	5.9
Feb	26° / 16°	100	12.8	12.9	6.2
Mar	25° / 14°	84	11.5	12.2	6.9
Apr	23° / 11°	41	6.8	11.4	7.6
May	21° / 7°	15	2.7	10.7	8.2
Jun	18° / 4°	7	1.5	10.4	8.0
Jul	18° / 3°	3	0.7	10.5	8.1
Aug	21° / 6°	11	2.1	11.1	8.6
Sep	25° / 10°	22	3.6	11.8	8.5
Oct	26° / 13°	78	10.5	12.6	7.0
Nov	26° / 14°	101	13.8	13.3	6.2
Dec	26° / 15°	140	17	13.6	5.7

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 82% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 8% of August, with mostly cloudy or overcast conditions the remaining 10%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Clearer (%)	92	92	92	91	91	91	91	90	90	90	90	90	90	90	90	90	90	90	90	90	90	90	90	90	90	90	90	90	90	91	90
Cloudier (%)	8	8	8	9	9	9	9	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	9	10

	Clearer (%)	Cloudier (%)
1	92	8
2	92	8
3	92	8
4	91	9
5	91	9
6	91	9
7	91	9
8	90	10
9	90	10
10	90	10
11	90	10
12	90	10
13	90	10
14	90	10
15	90	10
16	90	10
17	90	10
18	90	10
19	90	10
20	90	10
21	90	10
22	90	10
23	90	10
24	90	10
25	90	10
26	90	10
27	90	10
28	90	10
29	90	10
30	91	9
31	90	10

Chance of precipitation in August

Any precipitation

Heidelberg gets around 11 mm of rain over 2.1 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 6% and peaks near 8% on the wettest days.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Rain chance (%)	5	5	5	5	5	5	6	6	6	6	6	6	6	6	6	6	6	6	6	7	7	7	7	7	7	7	7	8	8	8	8

	Rain chance (%)
1	5
2	5
3	5
4	5
5	5
6	5
7	6
8	6
9	6
10	6
11	6
12	6
13	6
14	6
15	6
16	6
17	6
18	6
19	6
20	7
21	7
22	7
23	7
24	7
25	7
26	7
27	7
28	8
29	8
30	8
31	8

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

Most of August feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, August lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Dry (%)	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100
31	100

Wind in August

Winds average 12 km/h in August.

Across August, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Wind speed (km/h)	11	11	11	11	11	11	11	11	11	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze

	Wind speed (km/h)	Feels
1	11	calm
2	11	calm
3	11	calm
4	11	calm
5	11	calm
6	11	calm
7	11	calm
8	11	calm
9	11	calm
10	12	calm
11	12	calm
12	12	calm
13	12	calm
14	12	calm
15	12	calm
16	12	calm
17	12	calm
18	12	calm
19	12	light breeze
20	12	light breeze
21	12	light breeze
22	12	light breeze
23	12	light breeze
24	12	light breeze
25	12	light breeze
26	12	light breeze
27	12	light breeze
28	12	light breeze
29	12	light breeze
30	12	light breeze
31	12	light breeze

Sunrise & sunset in August

DaylightNight

Daylight runs from about 10 h 42 min at the start of August to 11 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 42 minutes over August. Sunrise moves from 6:50 AM to 6:24 AM, and sunset from 5:35 PM to 5:49 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Daylight (h)	10.7	10.8	10.8	10.8	10.8	10.8	10.9	10.9	10.9	10.9	10.9	11.0	11.0	11.0	11.0	11.1	11.1	11.1	11.1	11.2	11.2	11.2	11.2	11.2	11.3	11.3	11.3	11.3	11.4	11.4	11.4
Sunrise (AM)	6:50	6:50	6:49	6:48	6:48	6:47	6:46	6:46	6:45	6:44	6:43	6:42	6:42	6:41	6:40	6:39	6:38	6:37	6:36	6:35	6:34	6:33	6:32	6:31	6:30	6:29	6:28	6:27	6:26	6:25	6:24
Sunset (PM)	5:35	5:35	5:36	5:36	5:37	5:37	5:38	5:38	5:39	5:39	5:40	5:40	5:41	5:41	5:42	5:42	5:43	5:43	5:44	5:44	5:45	5:45	5:46	5:46	5:47	5:47	5:48	5:48	5:48	5:49	5:49

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	10.7	6:50	5:35
2	10.8	6:50	5:35
3	10.8	6:49	5:36
4	10.8	6:48	5:36
5	10.8	6:48	5:37
6	10.8	6:47	5:37
7	10.9	6:46	5:38
8	10.9	6:46	5:38
9	10.9	6:45	5:39
10	10.9	6:44	5:39
11	10.9	6:43	5:40
12	11.0	6:42	5:40
13	11.0	6:42	5:41
14	11.0	6:41	5:41
15	11.0	6:40	5:42
16	11.1	6:39	5:42
17	11.1	6:38	5:43
18	11.1	6:37	5:43
19	11.1	6:36	5:44
20	11.2	6:35	5:44
21	11.2	6:34	5:45
22	11.2	6:33	5:45
23	11.2	6:32	5:46
24	11.2	6:31	5:46
25	11.3	6:30	5:47
26	11.3	6:29	5:47
27	11.3	6:28	5:48
28	11.3	6:27	5:48
29	11.4	6:26	5:48
30	11.4	6:25	5:49
31	11.4	6:24	5:49

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.97 kWh/m².

For context, solar energy here swings from a low near 3.89 kWh/m² to a high of 6.84 kWh/m² in December across the year — August's 4.97 kWh/m² falls in the middle.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Solar energy (kWh/m²)	4.5	4.5	4.6	4.6	4.6	4.7	4.7	4.7	4.8	4.8	4.8	4.8	4.9	4.9	4.9	5.0	5.0	5.0	5.1	5.1	5.1	5.2	5.2	5.3	5.3	5.3	5.4	5.4	5.5	5.5	5.5
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	4.5	Bright
2	4.5	Bright
3	4.6	Bright
4	4.6	Bright
5	4.6	Bright
6	4.7	Bright
7	4.7	Bright
8	4.7	Bright
9	4.8	Bright
10	4.8	Bright
11	4.8	Bright
12	4.8	Bright
13	4.9	Bright
14	4.9	Bright
15	4.9	Bright
16	5.0	Bright
17	5.0	Bright
18	5.0	Bright
19	5.1	Bright
20	5.1	Bright
21	5.1	Bright
22	5.2	Bright
23	5.2	Bright
24	5.3	Bright
25	5.3	Bright
26	5.3	Bright
27	5.4	Bright
28	5.4	Bright
29	5.5	Bright
30	5.5	Bright
31	5.5	Bright

Planning a trip in August

Hazard calendar for Heidelberg

In seasonPeak

None of Heidelberg's seasonal hazards are active in August. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Heidelberg's rainy season runs October–March, when most of the year's rain falls.

Rainy season

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is August a good time to visit Heidelberg?

Our two travel scores rate August for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

8.6

Sightseeing

1st-best month of the year

5.4

Beach & pool

9th-best month of the year

August is one of the better times to visit Heidelberg for general sightseeing.

What to pack for Heidelberg in August

From August's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In August, Heidelberg sees daytime highs around 21°C and nights near 6°C. Worth packing: a warm layer and sun protection.

a warm layersun protection

UV index in Heidelberg in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Heidelberg peaks around January 12 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 20 at about 5 (high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	14	13	12	9	6	5	6	7	9	10	12	14
Level	Extreme	Extreme	Extreme	Very high	High	High	High	Very high	Very high	Extreme	Extreme	Extreme

	UV index (midday)	Level
Jan	14	Extreme
Feb	13	Extreme
Mar	12	Extreme
Apr	9	Very high
May	6	High
Jun	5	High
Jul	6	High
Aug	7	Very high
Sep	9	Very high
Oct	10	Extreme
Nov	12	Extreme
Dec	14	Extreme

Air quality in Heidelberg in August

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where August falls, not just the annual average.

Air quality in Heidelberg is worst in June — around 259 µg/m³ PM2.5 (very unhealthy), about 6.0× the cleanest month (January, 43 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	43	63	101	158	232	259	259	200	144	91	65	50
Level	Poor	Unhealthy	Unhealthy	Very unhealthy	Very unhealthy	Very unhealthy	Very unhealthy	Very unhealthy	Unhealthy	Unhealthy	Unhealthy	Poor

	PM2.5 (µg/m³)	Level
Jan	43	Poor
Feb	63	Unhealthy
Mar	101	Unhealthy
Apr	158	Very unhealthy
May	232	Very unhealthy
Jun	259	Very unhealthy
Jul	259	Very unhealthy
Aug	200	Very unhealthy
Sep	144	Unhealthy
Oct	91	Unhealthy
Nov	65	Unhealthy
Dec	50	Poor

Location & terrain

Where is Heidelberg?

Heidelberg sits at 26.5°S, 28.4°E, 1,525 m above sea level, in South Africa. The nearest listed city is Nigel, 14 km away.

Topography around Heidelberg

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Heidelberg.

Within 3 km, the terrain around Heidelberg has only modest variations in elevation — a maximum elevation change of 239 m around an average of 1,557 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 440 m; within 80 km, large variations in elevation — a maximum elevation change of 665 m.

The land around Heidelberg is covered by grassland (51%) and artificial surfaces (28%) within 3 km, grassland (60%) and cropland (30%) within 16 km, and grassland (50%) and cropland (34%) within 80 km.

3 km

239 m

grassland 51%

16 km

440 m

grassland 60%

80 km

665 m

grassland 50%

treesshrubsgrasslandcroplandartificial surfacesbare terrainwater

← July Heidelberg year-round climate September →Best places to visit in August

August weather nearby: Nigel 14 km · Tokoza 28 km · Springs 29 km · Balfour 29 km · Brakpan 30 km · Boksburg 34 km · Germiston 35 km · Alberton 35 km

South Africa travel facts

Travel advisory: Level 2; Exercise Increased Caution
Power plugs: Type C / M / N; 230 V · 50 Hz
Prices: ≈ 41% of US; price level, 2025
GDP per capita: $6,598; 2025
Happiness: 5.0 / 10; World Happiness, 2025
Safe drinking water: 68%; of population, 2024
Homicide rate: 43.7; per 100k, 2022
Road deaths: 22.2; per 100k/yr, 2019
Income group: Upper middle; World Bank
English: Very high; EF EPI 602
Religion

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Heidelberg (-26.5048°, 28.3592°, elevation 1,525 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).

	Avg high (°C)	Avg low (°C)
1	20	4
2	20	4
3	20	5
4	20	5
5	20	5
6	20	5
7	20	5
8	20	5
9	20	5
10	21	5
11	21	6
12	21	6
13	21	6
14	21	6
15	21	6
16	21	6
17	21	6
18	21	6
19	22	7
20	22	7
21	22	7
22	22	7
23	22	7
24	22	7
25	22	7
26	23	8
27	23	8
28	23	8
29	23	8
30	23	8
31	23	8

	Clearer (%)	Cloudier (%)
1	92	8
2	92	8
3	92	8
4	91	9
5	91	9
6	91	9
7	91	9
8	90	10
9	90	10
10	90	10
11	90	10
12	90	10
13	90	10
14	90	10
15	90	10
16	90	10
17	90	10
18	90	10
19	90	10
20	90	10
21	90	10
22	90	10
23	90	10
24	90	10
25	90	10
26	90	10
27	90	10
28	90	10
29	90	10
30	91	9
31	90	10

	Rain chance (%)
1	5
2	5
3	5
4	5
5	5
6	5
7	6
8	6
9	6
10	6
11	6
12	6
13	6
14	6
15	6
16	6
17	6
18	6
19	6
20	7
21	7
22	7
23	7
24	7
25	7
26	7
27	7
28	8
29	8
30	8
31	8

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100
31	100

	Avg high (°C)	Avg low (°C)
1	20	4
2	20	4
3	20	5
4	20	5
5	20	5
6	20	5
7	20	5
8	20	5
9	20	5
10	21	5
11	21	6
12	21	6
13	21	6
14	21	6
15	21	6
16	21	6
17	21	6
18	21	6
19	22	7
20	22	7
21	22	7
22	22	7
23	22	7
24	22	7
25	22	7
26	23	8
27	23	8
28	23	8
29	23	8
30	23	8
31	23	8

	Clearer (%)	Cloudier (%)
1	92	8
2	92	8
3	92	8
4	91	9
5	91	9
6	91	9
7	91	9
8	90	10
9	90	10
10	90	10
11	90	10
12	90	10
13	90	10
14	90	10
15	90	10
16	90	10
17	90	10
18	90	10
19	90	10
20	90	10
21	90	10
22	90	10
23	90	10
24	90	10
25	90	10
26	90	10
27	90	10
28	90	10
29	90	10
30	91	9
31	90	10

	Rain chance (%)
1	5
2	5
3	5
4	5
5	5
6	5
7	6
8	6
9	6
10	6
11	6
12	6
13	6
14	6
15	6
16	6
17	6
18	6
19	6
20	7
21	7
22	7
23	7
24	7
25	7
26	7
27	7
28	8
29	8
30	8
31	8

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100
31	100

	Avg high (°C)	Avg low (°C)
1	20	4
2	20	4
3	20	5
4	20	5
5	20	5
6	20	5
7	20	5
8	20	5
9	20	5
10	21	5
11	21	6
12	21	6
13	21	6
14	21	6
15	21	6
16	21	6
17	21	6
18	21	6
19	22	7
20	22	7
21	22	7
22	22	7
23	22	7
24	22	7
25	22	7
26	23	8
27	23	8
28	23	8
29	23	8
30	23	8
31	23	8

	Clearer (%)	Cloudier (%)
1	92	8
2	92	8
3	92	8
4	91	9
5	91	9
6	91	9
7	91	9
8	90	10
9	90	10
10	90	10
11	90	10
12	90	10
13	90	10
14	90	10
15	90	10
16	90	10
17	90	10
18	90	10
19	90	10
20	90	10
21	90	10
22	90	10
23	90	10
24	90	10
25	90	10
26	90	10
27	90	10
28	90	10
29	90	10
30	91	9
31	90	10

	Rain chance (%)
1	5
2	5
3	5
4	5
5	5
6	5
7	6
8	6
9	6
10	6
11	6
12	6
13	6
14	6
15	6
16	6
17	6
18	6
19	6
20	7
21	7
22	7
23	7
24	7
25	7
26	7
27	7
28	8
29	8
30	8
31	8

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100
31	100