Mossel Bay weather in September

In September, Mossel Bay sees average daytime highs of 17°C and overnight lows near 14°C, with 33 mm of rain across 6.5 wet days and about 11.8 hours of daylight. It is the 10th-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 17°C through the month. The sky is clear or mostly clear about 47% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 18 min at the start of September to 12 h 18 min by month's end. Set against the rest of the year, September is Mossel Bay's 11th-clearest and 5th-windiest month. For the whole year in context, see Mossel Bay's year-round climate.

Daytime high: 17°; 10th warmest
Overnight low: 14°; 4th coldest
Rainfall: 33 mm; 6.5 wet days
Daylight: 11 h 48 min; 6:32 AM – 6:19 PM
Cloud cover: 45%; 11th clearest
Wind: 18 km/h; 5th windiest
Solar energy: 4.8 kWh/m²
Travel score: 6.1; out of 10

Mossel Bay is town in the Western Cape, South Africa.

Density: 1,871/km²; people per km²
Founded: 1848

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

← August Mossel Bay 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 17°C through the month.

A typical September day in Mossel Bay reaches about 17°C in the afternoon and slips back to 14°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 19°C. Set against its neighbours, September runs on par with August and about 1°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)	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17
Avg low (°C)	13	13	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	15

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

Mossel Bay weather by month

How September compares with the rest of the year at a glance. September is the 10th-warmest and 11th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	22° / 19°	37	7.5	14	7.4
Feb	22° / 20°	30	6.7	13.3	7.4
Mar	21° / 19°	41	7.4	12.3	7.3
Apr	20° / 17°	43	6.7	11.2	6.9
May	19° / 15°	40	6.2	10.2	6.9
Jun	17° / 14°	37	6.9	9.8	6.4
Jul	17° / 13°	38	7.2	10	6.1
Aug	17° / 13°	47	7.6	10.7	5.9
Sep	17° / 14°	33	6.5	11.8	6.1
Oct	18° / 15°	43	7.4	12.9	6.5
Nov	19° / 17°	52	7.7	13.8	6.7
Dec	21° / 18°	35	6.8	14.2	7.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 47% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 19% of September, with mostly cloudy or overcast conditions the remaining 35%.

	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 (%)	70	69	69	68	68	67	67	66	66	65	65	65	65	64	64	64	64	64	64	65	65	65	65	65	65	65	64	64	64	64
Cloudier (%)	30	31	31	32	32	33	33	34	34	35	35	35	35	36	36	36	36	36	36	35	35	35	35	35	35	35	36	36	36	36

	Clearer (%)	Cloudier (%)
1	70	30
2	69	31
3	69	31
4	68	32
5	68	32
6	67	33
7	67	33
8	66	34
9	66	34
10	65	35
11	65	35
12	65	35
13	65	35
14	64	36
15	64	36
16	64	36
17	64	36
18	64	36
19	64	36
20	65	35
21	65	35
22	65	35
23	65	35
24	65	35
25	65	35
26	65	35
27	64	36
28	64	36
29	64	36
30	64	36

Chance of precipitation in September

Any precipitation

Mossel Bay gets around 33 mm of rain over 6.5 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 22% and peaks near 23% 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 (%)	22	22	22	22	22	22	22	21	21	21	21	21	21	21	21	21	21	21	22	22	22	22	23	23	23	23	23	22	22	22

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

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 71% 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 (%)	82	82	81	81	79	79	77	76	75	74	73	72	71	71	70	69	68	68	68	68	67	67	67	67	66	65	65	63	62	62
Comfortable (%)	17	17	18	19	20	20	22	23	24	25	26	27	28	28	29	29	30	30	30	30	31	31	31	31	32	33	33	34	35	35
Humid (%)	1	1	1	0	1	1	1	1	1	1	1	1	1	1	1	2	2	2	2	2	2	2	2	2	2	2	2	3	3	3

	Dry (%)	Comfortable (%)	Humid (%)
1	82	17	1
2	82	17	1
3	81	18	1
4	81	19	0
5	79	20	1
6	79	20	1
7	77	22	1
8	76	23	1
9	75	24	1
10	74	25	1
11	73	26	1
12	72	27	1
13	71	28	1
14	71	28	1
15	70	29	1
16	69	29	2
17	68	30	2
18	68	30	2
19	68	30	2
20	68	30	2
21	67	31	2
22	67	31	2
23	67	31	2
24	67	31	2
25	66	32	2
26	65	33	2
27	65	33	2
28	63	34	3
29	62	35	3
30	62	35	3

Wind in September

Winds average 18 km/h in September.

Across September, daily wind ranges from about 17 km/h on the calmest days to 18 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)	17	17	17	17	17	17	17	17	17	17	17	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18
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	17	light breeze
2	17	light breeze
3	17	light breeze
4	17	light breeze
5	17	light breeze
6	17	light breeze
7	17	light breeze
8	17	light breeze
9	17	light breeze
10	17	light breeze
11	17	light breeze
12	18	light breeze
13	18	light breeze
14	18	light breeze
15	18	light breeze
16	18	light breeze
17	18	light breeze
18	18	light breeze
19	18	light breeze
20	18	light breeze
21	18	light breeze
22	18	light breeze
23	18	light breeze
24	18	light breeze
25	18	light breeze
26	18	light breeze
27	18	light breeze
28	18	light breeze
29	18	light breeze
30	18	light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 18 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 60 minutes over September. Sunrise moves from 6:54 AM to 6:12 AM, and sunset from 6:09 PM to 6:30 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)	11.3	11.3	11.3	11.4	11.4	11.4	11.5	11.5	11.5	11.6	11.6	11.6	11.7	11.7	11.8	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)	6:54	6:52	6:51	6:49	6:48	6:47	6:45	6:44	6:42	6:41	6:39	6:38	6:36	6:35	6:34	6:32	6:31	6:29	6:28	6:26	6:25	6:23	6:22	6:20	6:19	6:17	6:16	6:15	6:13	6:12
Sunset (PM)	6:09	6:09	6:10	6:11	6:12	6:12	6:13	6:14	6:14	6:15	6:16	6:17	6:17	6:18	6:19	6:19	6:20	6:21	6:22	6:22	6:23	6:24	6:25	6:25	6:26	6:27	6:27	6:28	6:29	6:30

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.3	6:54	6:09
2	11.3	6:52	6:09
3	11.3	6:51	6:10
4	11.4	6:49	6:11
5	11.4	6:48	6:12
6	11.4	6:47	6:12
7	11.5	6:45	6:13
8	11.5	6:44	6:14
9	11.5	6:42	6:14
10	11.6	6:41	6:15
11	11.6	6:39	6:16
12	11.6	6:38	6:17
13	11.7	6:36	6:17
14	11.7	6:35	6:18
15	11.8	6:34	6:19
16	11.8	6:32	6:19
17	11.8	6:31	6:20
18	11.9	6:29	6:21
19	11.9	6:28	6:22
20	11.9	6:26	6:22
21	12.0	6:25	6:23
22	12.0	6:23	6:24
23	12.0	6:22	6:25
24	12.1	6:20	6:25
25	12.1	6:19	6:26
26	12.2	6:17	6:27
27	12.2	6:16	6:27
28	12.2	6:15	6:28
29	12.3	6:13	6:29
30	12.3	6:12	6:30

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.8 kWh/m².

For context, solar energy here swings from a low near 2.6 kWh/m² to a high of 7.58 kWh/m² in December across the year — September's 4.8 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)	4.2	4.3	4.3	4.3	4.4	4.4	4.4	4.5	4.5	4.6	4.6	4.7	4.7	4.7	4.8	4.8	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
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

	Solar energy (kWh/m²)	Level
1	4.2	Bright
2	4.3	Bright
3	4.3	Bright
4	4.3	Bright
5	4.4	Bright
6	4.4	Bright
7	4.4	Bright
8	4.5	Bright
9	4.5	Bright
10	4.6	Bright
11	4.6	Bright
12	4.7	Bright
13	4.7	Bright
14	4.7	Bright
15	4.8	Bright
16	4.8	Bright
17	4.9	Bright
18	4.9	Bright
19	5.0	Bright
20	5.0	Bright
21	5.0	Bright
22	5.1	Bright
23	5.1	Bright
24	5.1	Bright
25	5.2	Bright
26	5.2	Bright
27	5.3	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 Mossel Bay?

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

6.1

Sightseeing

10th-best month of the year

1.5

Beach & pool

10th-best month of the year

September is a reasonable time to visit Mossel Bay for sightseeing.

What to pack for Mossel Bay in September

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

In September, Mossel Bay sees daytime highs around 17°C and nights near 14°C. Worth packing: sun protection. About 7 days see rain.

sun protection

Sea temperature near Mossel Bay 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 at the nearest coast (about 21 km away) is warmest in January at about 21°C and coldest in August near 16°C.

It's comfortable for a long swim from Dec 15 to Mar 18 — about 3.1 months when the water holds above 20°C.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	21	21	20	18	17	16	16	16	16	17	19	20
Comfort	Refreshing	Refreshing	Refreshing	Cool	Cool	Cool	Cool	Cool	Cool	Cool	Cool	Refreshing

	Sea temperature (°C)	Comfort
Jan	21	Refreshing
Feb	21	Refreshing
Mar	20	Refreshing
Apr	18	Cool
May	17	Cool
Jun	16	Cool
Jul	16	Cool
Aug	16	Cool
Sep	16	Cool
Oct	17	Cool
Nov	19	Cool
Dec	20	Refreshing

UV index in Mossel Bay 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 Mossel Bay peaks around January 14 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 22 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	10	6	4	3	3	4	6	10	11	12
Level	Extreme	Extreme	Very high	High	Moderate	Moderate	Moderate	Moderate	High	Extreme	Extreme	Extreme

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

Location & terrain

Where is Mossel Bay?

Mossel Bay sits at 34.2°S, 22.1°E, 43 m above sea level, in South Africa. The nearest listed city is Groot-Brakrivier, 17 km away.

Topography around Mossel Bay

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

Within 3 km, the terrain around Mossel Bay has only modest variations in elevation — a maximum elevation change of 175 m around an average of 28 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 336 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,504 m.

The land around Mossel Bay is covered by water (70%) within 3 km, water (69%) within 16 km, and water (35%), shrubs (27%) and grassland (22%) within 80 km.

3 km

175 m

water 70%

16 km

336 m

water 69%

80 km

1,504 m

water 35%

treesshrubsgrasslandcroplandartificial surfacesbare terrainwater

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

September weather nearby: Groot-Brakrivier 17 km · George 38 km · Oudtshoorn 65 km · Dysselsdorp 73 km · Riversdale 82 km · Knysna 85 km · Plettenberg Bay 114 km · Swellendam 158 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 Mossel Bay (-34.1831°, 22.146°, elevation 43 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. 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	17	13
2	17	13
3	17	14
4	17	14
5	17	14
6	17	14
7	17	14
8	17	14
9	17	14
10	17	14
11	17	14
12	17	14
13	17	14
14	17	14
15	17	14
16	17	14
17	17	14
18	17	14
19	17	14
20	17	14
21	17	14
22	17	14
23	17	14
24	17	14
25	17	14
26	17	14
27	17	14
28	17	14
29	17	14
30	17	15

	Clearer (%)	Cloudier (%)
1	70	30
2	69	31
3	69	31
4	68	32
5	68	32
6	67	33
7	67	33
8	66	34
9	66	34
10	65	35
11	65	35
12	65	35
13	65	35
14	64	36
15	64	36
16	64	36
17	64	36
18	64	36
19	64	36
20	65	35
21	65	35
22	65	35
23	65	35
24	65	35
25	65	35
26	65	35
27	64	36
28	64	36
29	64	36
30	64	36

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

	Dry (%)	Comfortable (%)	Humid (%)
1	82	17	1
2	82	17	1
3	81	18	1
4	81	19	0
5	79	20	1
6	79	20	1
7	77	22	1
8	76	23	1
9	75	24	1
10	74	25	1
11	73	26	1
12	72	27	1
13	71	28	1
14	71	28	1
15	70	29	1
16	69	29	2
17	68	30	2
18	68	30	2
19	68	30	2
20	68	30	2
21	67	31	2
22	67	31	2
23	67	31	2
24	67	31	2
25	66	32	2
26	65	33	2
27	65	33	2
28	63	34	3
29	62	35	3
30	62	35	3

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

	Clearer (%)	Cloudier (%)
1	70	30
2	69	31
3	69	31
4	68	32
5	68	32
6	67	33
7	67	33
8	66	34
9	66	34
10	65	35
11	65	35
12	65	35
13	65	35
14	64	36
15	64	36
16	64	36
17	64	36
18	64	36
19	64	36
20	65	35
21	65	35
22	65	35
23	65	35
24	65	35
25	65	35
26	65	35
27	64	36
28	64	36
29	64	36
30	64	36

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

	Dry (%)	Comfortable (%)	Humid (%)
1	82	17	1
2	82	17	1
3	81	18	1
4	81	19	0
5	79	20	1
6	79	20	1
7	77	22	1
8	76	23	1
9	75	24	1
10	74	25	1
11	73	26	1
12	72	27	1
13	71	28	1
14	71	28	1
15	70	29	1
16	69	29	2
17	68	30	2
18	68	30	2
19	68	30	2
20	68	30	2
21	67	31	2
22	67	31	2
23	67	31	2
24	67	31	2
25	66	32	2
26	65	33	2
27	65	33	2
28	63	34	3
29	62	35	3
30	62	35	3

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

	Clearer (%)	Cloudier (%)
1	70	30
2	69	31
3	69	31
4	68	32
5	68	32
6	67	33
7	67	33
8	66	34
9	66	34
10	65	35
11	65	35
12	65	35
13	65	35
14	64	36
15	64	36
16	64	36
17	64	36
18	64	36
19	64	36
20	65	35
21	65	35
22	65	35
23	65	35
24	65	35
25	65	35
26	65	35
27	64	36
28	64	36
29	64	36
30	64	36

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

	Dry (%)	Comfortable (%)	Humid (%)
1	82	17	1
2	82	17	1
3	81	18	1
4	81	19	0
5	79	20	1
6	79	20	1
7	77	22	1
8	76	23	1
9	75	24	1
10	74	25	1
11	73	26	1
12	72	27	1
13	71	28	1
14	71	28	1
15	70	29	1
16	69	29	2
17	68	30	2
18	68	30	2
19	68	30	2
20	68	30	2
21	67	31	2
22	67	31	2
23	67	31	2
24	67	31	2
25	66	32	2
26	65	33	2
27	65	33	2
28	63	34	3
29	62	35	3
30	62	35	3