Malmesbury weather in September

In September, Malmesbury sees average daytime highs of 20°C and overnight lows near 9°C, with 52 mm of rain across 7.6 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 42% 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 Malmesbury's 12th-clearest and 7th-windiest month. For the whole year in context, see Malmesbury's year-round climate.

Daytime high
20°
9th warmest
Overnight low
4th coldest
Rainfall
52 mm
7.6 wet days
Daylight
11 h 48 min
6:46 AM – 6:33 PM
Cloud cover
47%
12th clearest
Wind
10 km/h
7th windiest
Solar energy
4.91 kWh/m²
Travel score
6.9
out of 10

Malmesbury is town in the Western Cape, South Africa.

Density
2,288/km²
people per km²
Founded
1745

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

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 Malmesbury reaches about 20°C in the afternoon and slips back to 9°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 26°C. Set against its neighbours, September runs about 2°C warmer than August and about 4°C cooler than October.

10°20°30°151015202530
Avg high (°C)Avg low (°C)
1198
2198
3198
4198
5198
6198
7198
8199
9209
10209
11209
12209
13209
14209
15209
16209
17209
18209
19209
20209
21209
22219
23219
24219
25219
26219
272110
282110
292110
302210

Malmesbury 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.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 17°142.6146.2
Feb31° / 18°122.313.26.1
Mar29° / 16°152.712.37.1
Apr25° / 13°414.811.28.0
May22° / 10°667.310.37.2
Jun18° / 1079.99.86.2
Jul18° / 938.9106.2
Aug18° / 829.410.86.3
Sep20° / 527.611.86.9
Oct24° / 11°324.912.88.0
Nov26° / 14°294.713.77.9
Dec29° / 16°163.314.27.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 42% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 41%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15545
25545
35545
45545
55644
65644
75644
85743
95743
105842
115842
125941
136040
146040
156040
166040
176139
186040
196040
206040
216040
226139
236139
246139
256238
266337
276337
286337
296337
306436

Chance of precipitation in September

Any precipitation

Malmesbury gets around 52 mm of rain over 7.6 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 25% and peaks near 29% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
129
228
328
428
527
627
726
826
926
1026
1126
1226
1325
1425
1525
1625
1725
1825
1925
2025
2125
2225
2324
2424
2523
2622
2722
2821
2920
3020

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.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)
1982
2982
3982
4982
5973
6973
7973
8973
9964
10964
11955
12955
13946
14946
15946
16946
17946
18937
19937
20937
21946
22946
23946
24946
25946
26946
27946
28937
29937
30937

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 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm

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 7:07 AM to 6:26 AM, and sunset from 6:23 PM to 6:43 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.37:076:23
211.37:056:24
311.37:046:24
411.47:036:25
511.47:016:26
611.47:006:26
711.56:586:27
811.56:576:28
911.56:566:28
1011.66:546:29
1111.66:536:30
1211.76:516:31
1311.76:506:31
1411.76:486:32
1511.86:476:33
1611.86:466:33
1711.86:446:34
1811.96:436:35
1911.96:416:35
2011.96:406:36
2112.06:386:37
2212.06:376:37
2312.06:366:38
2412.16:346:39
2512.16:336:40
2612.26:316:40
2712.26:306:41
2812.26:286:42
2912.36:276:42
3012.36:266:43

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 2.54 kWh/m² to a high of 8.4 kWh/m² in January across the year — September's 4.91 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
14.2Bright
24.2Bright
34.3Bright
44.3Bright
54.4Bright
64.4Bright
74.5Bright
84.5Bright
94.6Bright
104.6Bright
114.7Bright
124.7Bright
134.8Bright
144.8Bright
154.9Bright
164.9Bright
175.0Bright
185.0Bright
195.1Bright
205.1Bright
215.2Bright
225.2Bright
235.3Bright
245.4Bright
255.4Bright
265.5Bright
275.5Bright
285.6Bright
295.7Bright
305.7Bright
Planning a trip in September

Hazard calendar for Malmesbury

In seasonPeak

In September, Malmesbury sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Malmesbury's rainy season runs May–September, when most of the year's rain falls.

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

Is September a good time to visit Malmesbury?

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

6.9
Sightseeing
7th-best month of the year
3.6
Beach & pool
9th-best month of the year

September is a reasonable time to visit Malmesbury for sightseeing.

What to pack for Malmesbury in September

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

In September, Malmesbury sees daytime highs around 20°C and nights near 9°C. Worth packing: sun protection. About 8 days see rain.

sun protection

Sea temperature near Malmesbury 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 at the nearest coast (about 37 km away) 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.

12°14°16°18°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°C)Comfort
Jan17Cool
Feb17Cool
Mar16Cool
Apr15Cool
May15Bracing
Jun15Bracing
Jul14Bracing
Aug14Bracing
Sep15Bracing
Oct15Bracing
Nov16Cool
Dec16Cool

UV index in Malmesbury in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Malmesbury 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateExtremeJan 13UV 13Jun 20UV 3
UV index (midday)Level
Jan13Extreme
Feb10Very high
Mar9Very high
Apr6High
May4Moderate
Jun3Moderate
Jul3Moderate
Aug4Moderate
Sep5High
Oct10Extreme
Nov11Extreme
Dec12Extreme

Air quality in Malmesbury 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 Malmesbury 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).

0204060JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModerateMay 2152 µg/m³Dec 1516 µg/m³
PM2.5 (µg/m³)Level
Jan20Moderate
Feb19Moderate
Mar28Moderate
Apr41Poor
May52Poor
Jun50Poor
Jul47Poor
Aug41Poor
Sep33Moderate
Oct29Moderate
Nov18Moderate
Dec15Moderate
Location & terrain

Where is Malmesbury?

Malmesbury sits at 33.5°S, 18.7°E, 136 m above sea level, in South Africa. The nearest listed city is Atlantis, 25 km away.

Topography around Malmesbury

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

Within 3 km, the terrain around Malmesbury has only modest variations in elevation — a maximum elevation change of 188 m around an average of 166 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 892 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,073 m.

The land around Malmesbury is covered by cropland (39%), grassland (26%) and artificial surfaces (23%) within 3 km, cropland (67%) within 16 km, and cropland (30%) and grassland (25%) within 80 km.

3 km
188 m
16 km
892 m
80 km
2,073 m
treesshrubsgrasslandcroplandartificial surfaceswater
September weather nearby: Atlantis 25 km · Wellington 33 km · Moorreesburg 35 km · Paarl 38 km · Durbanville 42 km · Kraaifontein 43 km · Kuils River 54 km · Stellenbosch 54 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
Christian 86%or other traditional African religions 5%nothing in particular 5%Muslim 2%

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 Malmesbury (-33.4608°, 18.7271°, elevation 136 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).