Atlantis weather in September

In September, Atlantis sees average daytime highs of 20°C and overnight lows near 10°C, with 36 mm of rain across 6.3 wet days and about 11.8 hours of daylight. It is the 9th-warmest and 5th-wettest month of the year here.

Highs climb over the month, from about 19°C in the first days to 21°C by the end. The sky is clear or mostly clear about 44% 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 Atlantis's 11th-clearest and 7th-windiest month. For the whole year in context, see Atlantis's year-round climate.

Daytime high: 20°; 9th warmest
Overnight low: 10°; 4th coldest
Rainfall: 36 mm; 6.3 wet days
Daylight: 11 h 48 min; 6:47 AM – 6:34 PM
Cloud cover: 46%; 11th clearest
Wind: 13 km/h; 7th windiest
Solar energy: 4.91 kWh/m²
Travel score: 7.0; out of 10

Atlantis is town in the Western Cape, South Africa.

Density: 2,869/km²; people per km²

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

← August Atlantis 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

Highs climb over the month, from about 19°C in the first days to 21°C by the end.

A typical September day in Atlantis reaches about 20°C in the afternoon and slips back to 10°C overnight — a 10°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, September runs about 2°C warmer than August and about 3°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)	19	19	19	19	19	19	19	19	19	20	20	20	20	20	20	20	20	20	20	20	20	20	20	21	21	21	21	21	21	21
Avg low (°C)	9	9	9	9	9	9	9	9	9	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	11	11

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

Atlantis 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	29° / 17°	10	2.2	14	7.4
Feb	29° / 17°	10	1.9	13.2	7.3
Mar	27° / 16°	11	2.2	12.3	8.1
Apr	24° / 13°	32	4.2	11.2	8.1
May	21° / 10°	47	6.5	10.3	7.3
Jun	18° / 8°	76	9.4	9.8	6.3
Jul	18° / 7°	69	8.2	10	6.3
Aug	18° / 8°	59	8.5	10.8	6.4
Sep	20° / 10°	36	6.3	11.8	7.0
Oct	23° / 12°	24	4.1	12.8	8.1
Nov	25° / 14°	21	4.1	13.7	8.2
Dec	27° / 16°	12	2.9	14.2	8.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 44% 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 37%.

	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 (%)	58	59	59	59	59	59	60	60	61	61	62	62	63	63	63	63	64	64	64	63	63	63	65	65	65	65	66	66	66	66
Cloudier (%)	42	41	41	41	41	41	40	40	39	39	38	38	37	37	37	37	36	36	36	37	37	37	35	35	35	35	34	34	34	34

	Clearer (%)	Cloudier (%)
1	58	42
2	59	41
3	59	41
4	59	41
5	59	41
6	59	41
7	60	40
8	60	40
9	61	39
10	61	39
11	62	38
12	62	38
13	63	37
14	63	37
15	63	37
16	63	37
17	64	36
18	64	36
19	64	36
20	63	37
21	63	37
22	63	37
23	65	35
24	65	35
25	65	35
26	65	35
27	66	34
28	66	34
29	66	34
30	66	34

Chance of precipitation in September

Any precipitation

Atlantis gets around 36 mm of rain over 6.3 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 21% and peaks near 24% 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 (%)	24	24	23	23	23	22	22	21	21	21	21	21	20	20	20	20	20	21	21	21	21	21	21	20	20	19	19	18	18	17

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

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 93% 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 (%)	96	96	96	96	96	95	95	95	94	94	93	93	92	92	92	92	92	92	92	92	92	92	92	92	92	92	92	92	92	91
Comfortable (%)	4	4	4	4	4	5	5	5	6	6	7	7	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	8	9

	Dry (%)	Comfortable (%)
1	96	4
2	96	4
3	96	4
4	96	4
5	96	4
6	95	5
7	95	5
8	95	5
9	94	6
10	94	6
11	93	7
12	93	7
13	92	8
14	92	8
15	92	8
16	92	8
17	92	8
18	92	8
19	92	8
20	92	8
21	92	8
22	92	8
23	92	8
24	92	8
25	92	8
26	92	8
27	92	8
28	92	8
29	92	8
30	91	9

Wind in September

Winds average 13 km/h in September.

Across September, daily wind ranges from about 12 km/h on the calmest days to 13 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)	12	12	12	12	12	12	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13
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	12	light breeze
2	12	light breeze
3	12	light breeze
4	12	light breeze
5	12	light breeze
6	12	light breeze
7	13	light breeze
8	13	light breeze
9	13	light breeze
10	13	light breeze
11	13	light breeze
12	13	light breeze
13	13	light breeze
14	13	light breeze
15	13	light breeze
16	13	light breeze
17	13	light breeze
18	13	light breeze
19	13	light breeze
20	13	light breeze
21	13	light breeze
22	13	light breeze
23	13	light breeze
24	13	light breeze
25	13	light breeze
26	13	light breeze
27	13	light breeze
28	13	light breeze
29	13	light breeze
30	13	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 7:08 AM to 6:27 AM, and sunset from 6:24 PM to 6:44 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	11.7	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)	7:08	7:06	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	6:47	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	6:27
Sunset (PM)	6:24	6:25	6:25	6:26	6:27	6:27	6:28	6:29	6:29	6:30	6:31	6:31	6:32	6:33	6:34	6:34	6:35	6:36	6:36	6:37	6:38	6:38	6:39	6:40	6:41	6:41	6:42	6:43	6:43	6:44

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.3	7:08	6:24
2	11.3	7:06	6:25
3	11.3	7:05	6:25
4	11.4	7:04	6:26
5	11.4	7:02	6:27
6	11.4	7:01	6:27
7	11.5	6:59	6:28
8	11.5	6:58	6:29
9	11.5	6:57	6:29
10	11.6	6:55	6:30
11	11.6	6:54	6:31
12	11.7	6:52	6:31
13	11.7	6:51	6:32
14	11.7	6:49	6:33
15	11.8	6:48	6:34
16	11.8	6:47	6:34
17	11.8	6:45	6:35
18	11.9	6:44	6:36
19	11.9	6:42	6:36
20	11.9	6:41	6:37
21	12.0	6:39	6:38
22	12.0	6:38	6:38
23	12.0	6:36	6:39
24	12.1	6:35	6:40
25	12.1	6:34	6:41
26	12.2	6:32	6:41
27	12.2	6:31	6:42
28	12.2	6:29	6:43
29	12.3	6:28	6:43
30	12.3	6:27	6:44

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.91 kWh/m².

For context, solar energy here swings from a low near 2.53 kWh/m² to a high of 8.37 kWh/m² in January across the year — September's 4.91 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)	4.1	4.2	4.2	4.3	4.3	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	5.1	5.1	5.2	5.3	5.3	5.4	5.4	5.5	5.5	5.6	5.7	5.7
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	4.1	Bright
2	4.2	Bright
3	4.2	Bright
4	4.3	Bright
5	4.3	Bright
6	4.4	Bright
7	4.5	Bright
8	4.5	Bright
9	4.6	Bright
10	4.6	Bright
11	4.7	Bright
12	4.7	Bright
13	4.8	Bright
14	4.8	Bright
15	4.9	Bright
16	4.9	Bright
17	5.0	Bright
18	5.0	Bright
19	5.1	Bright
20	5.1	Bright
21	5.2	Bright
22	5.3	Bright
23	5.3	Bright
24	5.4	Bright
25	5.4	Bright
26	5.5	Bright
27	5.5	Bright
28	5.6	Bright
29	5.7	Bright
30	5.7	Bright

Planning a trip in September

Is September a good time to visit Atlantis?

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

7.0

Sightseeing

9th-best month of the year

3.6

Beach & pool

9th-best month of the year

September is one of the better times to visit Atlantis for general sightseeing.

What to pack for Atlantis in September

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

In September, Atlantis sees daytime highs around 20°C and nights near 10°C. Worth packing: sun protection. About 6 days see rain.

sun protection

Sea temperature near Atlantis in September

The nearest coast averages about 15°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 February at about 17°C and coldest in July near 14°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)	17	17	16	15	15	15	14	14	15	15	16	16
Comfort	Cool	Cool	Cool	Cool	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Cool	Cool

	Sea temperature (°C)	Comfort
Jan	17	Cool
Feb	17	Cool
Mar	16	Cool
Apr	15	Cool
May	15	Bracing
Jun	15	Bracing
Jul	14	Bracing
Aug	14	Bracing
Sep	15	Bracing
Oct	15	Bracing
Nov	16	Cool
Dec	16	Cool

UV index in Atlantis 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 Atlantis 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 11 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	Very high	Very high	High	Moderate	Moderate	Moderate	Moderate	High	Very high	Extreme	Extreme

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

Air quality in Atlantis 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 Atlantis is worst in May — around 52 µg/m³ PM2.5 (poor), about 3.4× the cleanest month (December, 15 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)	20	19	28	41	52	50	47	41	33	29	18	15
Level	Moderate	Moderate	Moderate	Poor	Poor	Poor	Poor	Poor	Moderate	Moderate	Moderate	Moderate

	PM2.5 (µg/m³)	Level
Jan	20	Moderate
Feb	19	Moderate
Mar	28	Moderate
Apr	41	Poor
May	52	Poor
Jun	50	Poor
Jul	47	Poor
Aug	41	Poor
Sep	33	Moderate
Oct	29	Moderate
Nov	18	Moderate
Dec	15	Moderate

Location & terrain

Where is Atlantis?

Atlantis sits at 33.6°S, 18.5°E, 178 m above sea level, in South Africa. The nearest listed city is Malmesbury, 25 km away.

Topography around Atlantis

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

Within 3 km, the terrain around Atlantis has only modest variations in elevation — a maximum elevation change of 92 m around an average of 173 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 557 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,042 m.

The land around Atlantis is covered by shrubs (50%) and artificial surfaces (25%) within 3 km, shrubs (37%) and cropland (24%) within 16 km, and water (30%) and cropland (29%) within 80 km.

3 km

92 m

shrubs 50%

16 km

557 m

shrubs 37%

80 km

2,042 m

water 30%

treesshrubsgrasslandcroplandartificial surfacesbare terrainwater

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

September weather nearby: Malmesbury 25 km · Durbanville 33 km · Kraaifontein 38 km · Cape Town 40 km · Rondebosch 44 km · Athlone 45 km · Kuils River 47 km · Lansdowne 47 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 Atlantis (-33.5667°, 18.4834°, elevation 178 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	19	9
2	19	9
3	19	9
4	19	9
5	19	9
6	19	9
7	19	9
8	19	9
9	19	9
10	20	10
11	20	10
12	20	10
13	20	10
14	20	10
15	20	10
16	20	10
17	20	10
18	20	10
19	20	10
20	20	10
21	20	10
22	20	10
23	20	10
24	21	10
25	21	10
26	21	10
27	21	10
28	21	10
29	21	11
30	21	11

	Clearer (%)	Cloudier (%)
1	58	42
2	59	41
3	59	41
4	59	41
5	59	41
6	59	41
7	60	40
8	60	40
9	61	39
10	61	39
11	62	38
12	62	38
13	63	37
14	63	37
15	63	37
16	63	37
17	64	36
18	64	36
19	64	36
20	63	37
21	63	37
22	63	37
23	65	35
24	65	35
25	65	35
26	65	35
27	66	34
28	66	34
29	66	34
30	66	34

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

	Dry (%)	Comfortable (%)
1	96	4
2	96	4
3	96	4
4	96	4
5	96	4
6	95	5
7	95	5
8	95	5
9	94	6
10	94	6
11	93	7
12	93	7
13	92	8
14	92	8
15	92	8
16	92	8
17	92	8
18	92	8
19	92	8
20	92	8
21	92	8
22	92	8
23	92	8
24	92	8
25	92	8
26	92	8
27	92	8
28	92	8
29	92	8
30	91	9

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

	Clearer (%)	Cloudier (%)
1	58	42
2	59	41
3	59	41
4	59	41
5	59	41
6	59	41
7	60	40
8	60	40
9	61	39
10	61	39
11	62	38
12	62	38
13	63	37
14	63	37
15	63	37
16	63	37
17	64	36
18	64	36
19	64	36
20	63	37
21	63	37
22	63	37
23	65	35
24	65	35
25	65	35
26	65	35
27	66	34
28	66	34
29	66	34
30	66	34

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

	Dry (%)	Comfortable (%)
1	96	4
2	96	4
3	96	4
4	96	4
5	96	4
6	95	5
7	95	5
8	95	5
9	94	6
10	94	6
11	93	7
12	93	7
13	92	8
14	92	8
15	92	8
16	92	8
17	92	8
18	92	8
19	92	8
20	92	8
21	92	8
22	92	8
23	92	8
24	92	8
25	92	8
26	92	8
27	92	8
28	92	8
29	92	8
30	91	9

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

	Clearer (%)	Cloudier (%)
1	58	42
2	59	41
3	59	41
4	59	41
5	59	41
6	59	41
7	60	40
8	60	40
9	61	39
10	61	39
11	62	38
12	62	38
13	63	37
14	63	37
15	63	37
16	63	37
17	64	36
18	64	36
19	64	36
20	63	37
21	63	37
22	63	37
23	65	35
24	65	35
25	65	35
26	65	35
27	66	34
28	66	34
29	66	34
30	66	34

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

	Dry (%)	Comfortable (%)
1	96	4
2	96	4
3	96	4
4	96	4
5	96	4
6	95	5
7	95	5
8	95	5
9	94	6
10	94	6
11	93	7
12	93	7
13	92	8
14	92	8
15	92	8
16	92	8
17	92	8
18	92	8
19	92	8
20	92	8
21	92	8
22	92	8
23	92	8
24	92	8
25	92	8
26	92	8
27	92	8
28	92	8
29	92	8
30	91	9