Riversdale weather in September

In September, Riversdale sees average daytime highs of 21°C and overnight lows near 10°C, with 23 mm of rain across 5 wet days and about 11.8 hours of daylight. It is the 9th-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 21°C through the month. The sky is clear or mostly clear about 43% 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 Riversdale's 10th-clearest and 6th-windiest month. For the whole year in context, see Riversdale's year-round climate.

Daytime high: 21°; 9th warmest
Overnight low: 10°; 4th coldest
Rainfall: 23 mm; 5 wet days
Daylight: 11 h 48 min; 6:36 AM – 6:23 PM
Cloud cover: 47%; 10th clearest
Wind: 10 km/h; 6th windiest
Solar energy: 4.78 kWh/m²
Travel score: 7.5; out of 10

Riversdale is town in the Western Cape, South Africa.

Founded: 1838

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

← August Riversdale 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 21°C through the month.

A typical September day in Riversdale reaches about 21°C in the afternoon and slips back to 10°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 27°C. Set against its neighbours, September runs about 2°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)	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	22	22	22	22	22	22	22	22	22	22	22	22	22	22
Avg low (°C)	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	10	11	11

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

Riversdale weather by month

How September compares with the rest of the year at a glance. September is the 9th-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	28° / 17°	27	5.3	14	7.4
Feb	28° / 17°	23	5.3	13.3	7.1
Mar	27° / 16°	37	6.4	12.3	7.4
Apr	24° / 13°	35	5.9	11.2	7.7
May	22° / 10°	28	5.2	10.3	7.6
Jun	19° / 7°	26	5.4	9.8	7.2
Jul	19° / 7°	27	5.6	10	7.1
Aug	20° / 8°	30	5.8	10.7	7.2
Sep	21° / 10°	23	5	11.8	7.5
Oct	24° / 12°	38	5.8	12.9	7.7
Nov	25° / 14°	43	6.1	13.8	7.7
Dec	27° / 16°	28	5.3	14.2	7.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 43% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 18% 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 (%)	66	65	64	63	63	62	62	62	61	61	61	60	60	60	60	60	60	61	61	61	61	61	61	61	60	60	60	60	60	59
Cloudier (%)	34	35	36	37	37	38	38	38	39	39	39	40	40	40	40	40	40	39	39	39	39	39	39	39	40	40	40	40	40	41

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

Chance of precipitation in September

Any precipitation

Riversdale gets around 23 mm of rain over 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 17% and peaks near 17% 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 (%)	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	16	16	16	16	16

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

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 95% 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 (%)	98	98	98	98	98	98	97	97	97	96	96	96	95	95	95	94	94	94	94	94	94	94	94	94	94	94	94	94	94	94
Comfortable (%)	2	2	2	2	2	2	3	3	3	4	4	4	5	5	5	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6

	Dry (%)	Comfortable (%)
1	98	2
2	98	2
3	98	2
4	98	2
5	98	2
6	98	2
7	97	3
8	97	3
9	97	3
10	96	4
11	96	4
12	96	4
13	95	5
14	95	5
15	95	5
16	94	6
17	94	6
18	94	6
19	94	6
20	94	6
21	94	6
22	94	6
23	94	6
24	94	6
25	94	6
26	94	6
27	94	6
28	94	6
29	94	6
30	94	6

Wind in September

Winds average 10 km/h in September.

Across September, daily wind ranges from about 10 km/h on the calmest days to 10 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)	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

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

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 6:57 AM to 6:15 AM, and sunset from 6:12 PM to 6:33 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)	6:57	6:56	6:54	6:53	6:51	6:50	6:49	6:47	6:46	6:44	6:43	6:41	6:40	6:38	6:37	6:36	6:34	6:33	6:31	6:30	6:28	6:27	6:25	6:24	6:22	6:21	6:20	6:18	6:17	6:15
Sunset (PM)	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	6:24	6:25	6:26	6:27	6:27	6:28	6:29	6:30	6:30	6:31	6:32	6:33	6:33

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.3	6:57	6:12
2	11.3	6:56	6:13
3	11.3	6:54	6:14
4	11.4	6:53	6:14
5	11.4	6:51	6:15
6	11.4	6:50	6:16
7	11.5	6:49	6:17
8	11.5	6:47	6:17
9	11.5	6:46	6:18
10	11.6	6:44	6:19
11	11.6	6:43	6:19
12	11.6	6:41	6:20
13	11.7	6:40	6:21
14	11.7	6:38	6:22
15	11.8	6:37	6:22
16	11.8	6:36	6:23
17	11.8	6:34	6:24
18	11.9	6:33	6:24
19	11.9	6:31	6:25
20	11.9	6:30	6:26
21	12.0	6:28	6:27
22	12.0	6:27	6:27
23	12.0	6:25	6:28
24	12.1	6:24	6:29
25	12.1	6:22	6:30
26	12.2	6:21	6:30
27	12.2	6:20	6:31
28	12.2	6:18	6:32
29	12.3	6:17	6:33
30	12.3	6:15	6:33

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.78 kWh/m².

For context, solar energy here swings from a low near 2.63 kWh/m² to a high of 7.36 kWh/m² in December across the year — September's 4.78 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	4.2	4.3	4.3	4.3	4.4	4.4	4.5	4.5	4.5	4.6	4.6	4.7	4.7	4.8	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
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	4.2	Bright
3	4.3	Bright
4	4.3	Bright
5	4.3	Bright
6	4.4	Bright
7	4.4	Bright
8	4.5	Bright
9	4.5	Bright
10	4.5	Bright
11	4.6	Bright
12	4.6	Bright
13	4.7	Bright
14	4.7	Bright
15	4.8	Bright
16	4.8	Bright
17	4.8	Bright
18	4.9	Bright
19	4.9	Bright
20	5.0	Bright
21	5.0	Bright
22	5.0	Bright
23	5.1	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	5.3	Bright

Planning a trip in September

Is September a good time to visit Riversdale?

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

7.5

Sightseeing

5th-best month of the year

4.8

Beach & pool

9th-best month of the year

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

What to pack for Riversdale in September

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

In September, Riversdale sees daytime highs around 21°C and nights near 10°C. Worth packing: sun protection. About 5 days see rain.

sun protection

Sea temperature near Riversdale 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 33 km away) is warmest in February at about 22°C and coldest in July near 15°C.

It's comfortable for a long swim from Dec 13 to Mar 25 — about 3.4 months when the water holds above 20°C.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	21	22	21	19	17	16	15	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	22	Refreshing
Mar	21	Refreshing
Apr	19	Cool
May	17	Cool
Jun	16	Cool
Jul	15	Cool
Aug	16	Cool
Sep	16	Cool
Oct	17	Cool
Nov	19	Cool
Dec	20	Refreshing

UV index in Riversdale 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 Riversdale peaks around January 14 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	12	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	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	12	Extreme
Dec	12	Extreme

Location & terrain

Where is Riversdale?

Riversdale sits at 34.1°S, 21.3°E, 121 m above sea level, in South Africa. The nearest listed city is Swellendam, 76 km away.

Topography around Riversdale

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

Within 3 km, the terrain around Riversdale has only modest variations in elevation — a maximum elevation change of 160 m around an average of 142 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,339 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,273 m.

The land around Riversdale is covered by cropland (39%) and shrubs (24%) within 3 km, cropland (40%), shrubs (26%) and grassland (24%) within 16 km, and shrubs (32%), grassland (28%) and water (23%) within 80 km.

3 km

160 m

cropland 39%

16 km

1,339 m

cropland 40%

80 km

2,273 m

shrubs 32%

treesshrubsgrasslandcroplandartificial surfaceswater

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

September weather nearby: Swellendam 76 km · Mossel Bay 82 km · Groot-Brakrivier 89 km · Oudtshoorn 103 km · Montagu 110 km · George 112 km · Ashton 115 km · Bredasdorp 122 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 Riversdale (-34.0934°, 21.2572°, elevation 121 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	21	9
2	21	9
3	21	9
4	21	9
5	21	9
6	21	9
7	21	9
8	21	9
9	21	10
10	21	10
11	21	10
12	21	10
13	21	10
14	21	10
15	21	10
16	21	10
17	22	10
18	22	10
19	22	10
20	22	10
21	22	10
22	22	10
23	22	10
24	22	10
25	22	10
26	22	10
27	22	10
28	22	10
29	22	11
30	22	11

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

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

	Dry (%)	Comfortable (%)
1	98	2
2	98	2
3	98	2
4	98	2
5	98	2
6	98	2
7	97	3
8	97	3
9	97	3
10	96	4
11	96	4
12	96	4
13	95	5
14	95	5
15	95	5
16	94	6
17	94	6
18	94	6
19	94	6
20	94	6
21	94	6
22	94	6
23	94	6
24	94	6
25	94	6
26	94	6
27	94	6
28	94	6
29	94	6
30	94	6

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

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

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

	Dry (%)	Comfortable (%)
1	98	2
2	98	2
3	98	2
4	98	2
5	98	2
6	98	2
7	97	3
8	97	3
9	97	3
10	96	4
11	96	4
12	96	4
13	95	5
14	95	5
15	95	5
16	94	6
17	94	6
18	94	6
19	94	6
20	94	6
21	94	6
22	94	6
23	94	6
24	94	6
25	94	6
26	94	6
27	94	6
28	94	6
29	94	6
30	94	6

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

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

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

	Dry (%)	Comfortable (%)
1	98	2
2	98	2
3	98	2
4	98	2
5	98	2
6	98	2
7	97	3
8	97	3
9	97	3
10	96	4
11	96	4
12	96	4
13	95	5
14	95	5
15	95	5
16	94	6
17	94	6
18	94	6
19	94	6
20	94	6
21	94	6
22	94	6
23	94	6
24	94	6
25	94	6
26	94	6
27	94	6
28	94	6
29	94	6
30	94	6