Gansbaai weather in September

In September, Gansbaai sees average daytime highs of 16°C and overnight lows near 13°C, with 48 mm of rain across 8.4 wet days and about 11.8 hours of daylight. It is the 9th-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 16°C through the month. The sky is clear or mostly clear about 36% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 12 min at the start of September to 12 h 18 min by month's end. Set against the rest of the year, September is Gansbaai's 12th-clearest and 6th-windiest month. For the whole year in context, see Gansbaai's year-round climate.

Daytime high: 16°; 9th warmest
Overnight low: 13°; 4th coldest
Rainfall: 48 mm; 8.4 wet days
Daylight: 11 h 48 min; 6:43 AM – 6:31 PM
Cloud cover: 50%; 12th clearest
Wind: 19 km/h; 6th windiest
Solar energy: 4.69 kWh/m²
Travel score: 5.5; out of 10

Gansbaai is town in the Western Cape, South Africa.

Founded: 1881

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

← August Gansbaai year-round climate October →Best places to visit in September

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 16°C through the month.

A typical September day in Gansbaai reaches about 16°C in the afternoon and slips back to 13°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 14°C and 19°C. Set against its neighbours, September runs about 1°C warmer than August and about 2°C cooler than October.

	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
Avg high (°C)	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17
Avg low (°C)	12	12	12	12	12	12	12	12	12	12	12	12	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13

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

Gansbaai weather by month

How September compares with the rest of the year at a glance. September is the 9th-warmest and 5th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	22° / 18°	22	4.9	14.1	7.9
Feb	22° / 19°	21	5.3	13.3	7.9
Mar	21° / 18°	27	5.9	12.3	7.5
Apr	20° / 16°	42	6.4	11.2	6.9
May	18° / 14°	52	8.2	10.2	6.3
Jun	16° / 12°	84	10.2	9.7	5.3
Jul	16° / 12°	85	9.7	9.9	5.1
Aug	16° / 12°	73	10.5	10.7	5.0
Sep	16° / 13°	48	8.4	11.8	5.5
Oct	18° / 14°	40	7.1	12.9	6.4
Nov	19° / 16°	38	6.4	13.8	6.9
Dec	21° / 17°	24	5.1	14.3	7.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 36% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 25% of September, with mostly cloudy or overcast conditions the remaining 39%.

	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
Clearer (%)	61	60	60	60	60	59	60	60	60	60	61	61	61	61	61	61	61	62	62	61	61	61	61	61	61	62	61	61	61	61
Cloudier (%)	39	40	40	40	40	41	40	40	40	40	39	39	39	39	39	39	39	38	38	39	39	39	39	39	39	38	39	39	39	39

	Clearer (%)	Cloudier (%)
1	61	39
2	60	40
3	60	40
4	60	40
5	60	40
6	59	41
7	60	40
8	60	40
9	60	40
10	60	40
11	61	39
12	61	39
13	61	39
14	61	39
15	61	39
16	61	39
17	61	39
18	62	38
19	62	38
20	61	39
21	61	39
22	61	39
23	61	39
24	61	39
25	61	39
26	62	38
27	61	39
28	61	39
29	61	39
30	61	39

Chance of precipitation in September

Any precipitation

Gansbaai gets around 48 mm of rain over 8.4 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 28% and peaks near 31% 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
Rain chance (%)	31	30	30	30	29	29	28	28	28	28	27	27	27	27	27	27	28	28	28	29	29	29	29	28	28	28	27	27	27	26

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

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 87% 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
Dry (%)	93	93	93	93	93	92	92	91	90	89	88	88	87	86	86	85	85	85	85	85	85	85	85	85	85	84	84	83	82	81
Comfortable (%)	7	7	7	7	7	8	8	9	10	11	12	12	13	14	14	15	15	15	15	15	15	15	15	15	15	16	16	17	18	19

	Dry (%)	Comfortable (%)
1	93	7
2	93	7
3	93	7
4	93	7
5	93	7
6	92	8
7	92	8
8	91	9
9	90	10
10	89	11
11	88	12
12	88	12
13	87	13
14	86	14
15	86	14
16	85	15
17	85	15
18	85	15
19	85	15
20	85	15
21	85	15
22	85	15
23	85	15
24	85	15
25	85	15
26	84	16
27	84	16
28	83	17
29	82	18
30	81	19

Wind in September

Winds average 19 km/h in September.

Across September, daily wind ranges from about 19 km/h on the calmest days to 19 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
Wind speed (km/h)	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19
Feels	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	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	light breeze	light breeze	light breeze	light breeze

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

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 12 min at the start of September to 12 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 66 minutes over September. Sunrise moves from 7:05 AM to 6:23 AM, and sunset from 6:20 PM to 6:41 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
Daylight (h)	11.2	11.3	11.3	11.3	11.4	11.4	11.5	11.5	11.5	11.6	11.6	11.6	11.7	11.7	11.7	11.8	11.8	11.9	11.9	11.9	12.0	12.0	12.0	12.1	12.1	12.2	12.2	12.2	12.3	12.3
Sunrise (AM)	7:05	7:04	7:02	7:01	6:59	6:58	6:57	6:55	6:54	6:52	6:51	6:49	6:48	6:46	6:45	6:43	6:42	6:40	6:39	6:37	6:36	6:34	6:33	6:31	6:30	6:29	6:27	6:26	6:24	6:23
Sunset (PM)	6:20	6:20	6:21	6:22	6:22	6:23	6:24	6:25	6:25	6:26	6:27	6:28	6:28	6:29	6:30	6:31	6:31	6:32	6:33	6:33	6:34	6:35	6:36	6:36	6:37	6:38	6:39	6:40	6:40	6:41

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.2	7:05	6:20
2	11.3	7:04	6:20
3	11.3	7:02	6:21
4	11.3	7:01	6:22
5	11.4	6:59	6:22
6	11.4	6:58	6:23
7	11.5	6:57	6:24
8	11.5	6:55	6:25
9	11.5	6:54	6:25
10	11.6	6:52	6:26
11	11.6	6:51	6:27
12	11.6	6:49	6:28
13	11.7	6:48	6:28
14	11.7	6:46	6:29
15	11.7	6:45	6:30
16	11.8	6:43	6:31
17	11.8	6:42	6:31
18	11.9	6:40	6:32
19	11.9	6:39	6:33
20	11.9	6:37	6:33
21	12.0	6:36	6:34
22	12.0	6:34	6:35
23	12.0	6:33	6:36
24	12.1	6:31	6:36
25	12.1	6:30	6:37
26	12.2	6:29	6:38
27	12.2	6:27	6:39
28	12.2	6:26	6:40
29	12.3	6:24	6:40
30	12.3	6:23	6:41

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.69 kWh/m².

For context, solar energy here swings from a low near 2.44 kWh/m² to a high of 7.76 kWh/m² in December across the year — September's 4.69 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
Solar energy (kWh/m²)	4.0	4.0	4.1	4.1	4.2	4.2	4.3	4.3	4.4	4.4	4.5	4.5	4.6	4.6	4.7	4.7	4.8	4.8	4.9	4.9	5.0	5.0	5.0	5.1	5.1	5.2	5.2	5.3	5.3	5.4
Level	Moderate	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	4.0	Moderate
2	4.0	Bright
3	4.1	Bright
4	4.1	Bright
5	4.2	Bright
6	4.2	Bright
7	4.3	Bright
8	4.3	Bright
9	4.4	Bright
10	4.4	Bright
11	4.5	Bright
12	4.5	Bright
13	4.6	Bright
14	4.6	Bright
15	4.7	Bright
16	4.7	Bright
17	4.8	Bright
18	4.8	Bright
19	4.9	Bright
20	4.9	Bright
21	5.0	Bright
22	5.0	Bright
23	5.0	Bright
24	5.1	Bright
25	5.1	Bright
26	5.2	Bright
27	5.2	Bright
28	5.3	Bright
29	5.3	Bright
30	5.4	Bright

Planning a trip in September

Is September a good time to visit Gansbaai?

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

5.5

Sightseeing

9th-best month of the year

1.0

Beach & pool

9th-best month of the year

September is a reasonable time to visit Gansbaai for sightseeing.

What to pack for Gansbaai in September

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

In September, Gansbaai sees daytime highs around 16°C and nights near 13°C. Worth packing: a warm layer, rain gear and sun protection. About 8 days see rain.

a warm layerrain gearsun protection

Sea temperature near Gansbaai in September

The nearest coast averages about 16°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in January at about 20°C and coldest in August near 15°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	20	19	18	17	16	16	15	15	16	16	18	19
Comfort	Cool	Cool	Cool	Cool	Cool	Cool	Cool	Cool	Cool	Cool	Cool	Cool

	Sea temperature (°C)	Comfort
Jan	20	Cool
Feb	19	Cool
Mar	18	Cool
Apr	17	Cool
May	16	Cool
Jun	16	Cool
Jul	15	Cool
Aug	15	Cool
Sep	16	Cool
Oct	16	Cool
Nov	18	Cool
Dec	19	Cool

UV index in Gansbaai in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Gansbaai peaks around January 13 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 20 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	13	10	9	6	3	3	3	4	6	10	11	12
Level	Extreme	Very high	Very high	High	Moderate	Moderate	Moderate	Moderate	High	Extreme	Extreme	Extreme

	UV index (midday)	Level
Jan	13	Extreme
Feb	10	Very high
Mar	9	Very high
Apr	6	High
May	3	Moderate
Jun	3	Moderate
Jul	3	Moderate
Aug	4	Moderate
Sep	6	High
Oct	10	Extreme
Nov	11	Extreme
Dec	12	Extreme

Air quality in Gansbaai in September

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Gansbaai is worst in June — around 18 µg/m³ PM2.5 (moderate), about 2.6× the cleanest month (November, 7 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)	11	8	12	11	16	18	16	15	13	9	7	8
Level	Good	Good	Moderate	Good	Moderate	Moderate	Moderate	Moderate	Moderate	Good	Good	Good

	PM2.5 (µg/m³)	Level
Jan	11	Good
Feb	8	Good
Mar	12	Moderate
Apr	11	Good
May	16	Moderate
Jun	18	Moderate
Jul	16	Moderate
Aug	15	Moderate
Sep	13	Moderate
Oct	9	Good
Nov	7	Good
Dec	8	Good

Location & terrain

Where is Gansbaai?

Gansbaai sits at 34.6°S, 19.4°E, 27 m above sea level, in South Africa. The nearest listed city is Hermanus, 21 km away.

Topography around Gansbaai

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

Within 3 km, the terrain around Gansbaai has significant variations in elevation — a maximum elevation change of 359 m around an average of 33 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 501 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,771 m.

The land around Gansbaai is covered by water (37%) and shrubs (34%) within 3 km, water (64%) and shrubs (23%) within 16 km, and water (42%) and grassland (26%) within 80 km.

3 km

359 m

water 37%

16 km

501 m

water 64%

80 km

1,771 m

water 42%

treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetland

← August Gansbaai year-round climate October →Best places to visit in September

September weather nearby: Hermanus 21 km · Caledon 40 km · Grabouw 57 km · Bredasdorp 63 km · Somerset West 74 km · Franschhoek 78 km · Le Roux 80 km · Stellenbosch 85 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 Gansbaai (-34.583°, 19.3505°, elevation 27 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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	16	12
2	16	12
3	16	12
4	16	12
5	16	12
6	16	12
7	16	12
8	16	12
9	16	12
10	16	12
11	16	12
12	16	12
13	16	13
14	16	13
15	16	13
16	17	13
17	17	13
18	17	13
19	17	13
20	17	13
21	17	13
22	17	13
23	17	13
24	17	13
25	17	13
26	17	13
27	17	13
28	17	13
29	17	13
30	17	13

	Clearer (%)	Cloudier (%)
1	61	39
2	60	40
3	60	40
4	60	40
5	60	40
6	59	41
7	60	40
8	60	40
9	60	40
10	60	40
11	61	39
12	61	39
13	61	39
14	61	39
15	61	39
16	61	39
17	61	39
18	62	38
19	62	38
20	61	39
21	61	39
22	61	39
23	61	39
24	61	39
25	61	39
26	62	38
27	61	39
28	61	39
29	61	39
30	61	39

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

	Dry (%)	Comfortable (%)
1	93	7
2	93	7
3	93	7
4	93	7
5	93	7
6	92	8
7	92	8
8	91	9
9	90	10
10	89	11
11	88	12
12	88	12
13	87	13
14	86	14
15	86	14
16	85	15
17	85	15
18	85	15
19	85	15
20	85	15
21	85	15
22	85	15
23	85	15
24	85	15
25	85	15
26	84	16
27	84	16
28	83	17
29	82	18
30	81	19

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

	Clearer (%)	Cloudier (%)
1	61	39
2	60	40
3	60	40
4	60	40
5	60	40
6	59	41
7	60	40
8	60	40
9	60	40
10	60	40
11	61	39
12	61	39
13	61	39
14	61	39
15	61	39
16	61	39
17	61	39
18	62	38
19	62	38
20	61	39
21	61	39
22	61	39
23	61	39
24	61	39
25	61	39
26	62	38
27	61	39
28	61	39
29	61	39
30	61	39

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

	Dry (%)	Comfortable (%)
1	93	7
2	93	7
3	93	7
4	93	7
5	93	7
6	92	8
7	92	8
8	91	9
9	90	10
10	89	11
11	88	12
12	88	12
13	87	13
14	86	14
15	86	14
16	85	15
17	85	15
18	85	15
19	85	15
20	85	15
21	85	15
22	85	15
23	85	15
24	85	15
25	85	15
26	84	16
27	84	16
28	83	17
29	82	18
30	81	19

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

	Clearer (%)	Cloudier (%)
1	61	39
2	60	40
3	60	40
4	60	40
5	60	40
6	59	41
7	60	40
8	60	40
9	60	40
10	60	40
11	61	39
12	61	39
13	61	39
14	61	39
15	61	39
16	61	39
17	61	39
18	62	38
19	62	38
20	61	39
21	61	39
22	61	39
23	61	39
24	61	39
25	61	39
26	62	38
27	61	39
28	61	39
29	61	39
30	61	39

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

	Dry (%)	Comfortable (%)
1	93	7
2	93	7
3	93	7
4	93	7
5	93	7
6	92	8
7	92	8
8	91	9
9	90	10
10	89	11
11	88	12
12	88	12
13	87	13
14	86	14
15	86	14
16	85	15
17	85	15
18	85	15
19	85	15
20	85	15
21	85	15
22	85	15
23	85	15
24	85	15
25	85	15
26	84	16
27	84	16
28	83	17
29	82	18
30	81	19