Annual mean 17°C · wettest around September · prevailing wind SW
Warmest
28.3 °C
Coldest
17.5 °C
Wettest
67%
Windiest
4.6 m/s
Prevailing
SW
3.9 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Swellendam over the whole year is 17°C. January is the hottest month, with highs of about 28°C; July is the coldest, with lows of about 8°C. Swellendam has no sharply defined rainy season: the chance of rain on a given day runs from 30% in February, the driest month, to 42% in September, the wettest. Winds in Swellendam are highest in January, averaging 3.3 m/s (12 km/h), and lightest in May, at 2.3 m/s (8 km/h). The prevailing wind is from the SW. The clearest skies in Swellendam come in July, when the sky is typically 53% covered; January is the cloudiest month, at 62%.
Month by month Swellendam climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
28°C
19°C
26°C
35%
62%
3.3 m/s
54
46
28
February
28°C
19°C
26°C
30%
59%
3.0 m/s
53
48
26
March
26°C
17°C
24°C
34%
61%
2.8 m/s
66
39
39
April
23°C
15°C
21°C
34%
57%
2.5 m/s
73
25
56
May
21°C
11°C
19°C
35%
55%
2.3 m/s
75
13
68
June
19°C
9°C
16°C
39%
53%
2.6 m/s
57
5
76
July
18°C
8°C
15°C
40%
53%
2.6 m/s
48
3
76
August
18°C
8°C
15°C
36%
55%
2.7 m/s
49
3
78
September
20°C
11°C
17°C
42%
57%
2.8 m/s
59
7
73
October
23°C
13°C
20°C
33%
57%
3.1 m/s
66
19
61
November
24°C
15°C
21°C
39%
56%
3.2 m/s
70
25
53
December
26°C
17°C
24°C
36%
59%
3.3 m/s
66
38
40
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Swellendam weather by season
Year round, Swellendam has days of about 18°C at their warmest in July, its coolest month, and 28°C in January, its warmest; the coolest hours of the day run from 8°C to 19°C through the year, and the average temperature over the year is 17°C around the clock. Rain is most likely around September and least likely around February. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Swellendam weather in winterJune to August
High 18°CLow 8°CRain 38%
Winter in Swellendam has typical daily highs of about 18°C and lows of about 8°C, with a 38% chance of rain on a given day.
Swellendam weather in springSeptember to November
High 22°CLow 13°CRain 38%
Spring in Swellendam has typical daily highs of about 22°C and lows of about 13°C, with a 38% chance of rain on a given day.
Swellendam weather in summerDecember to February
High 27°CLow 18°CRain 34%
Summer in Swellendam has typical daily highs of about 27°C and lows of about 18°C, with a 34% chance of rain on a given day.
Swellendam weather in autumnMarch to May
High 23°CLow 14°CRain 34%
Autumn in Swellendam has typical daily highs of about 23°C and lows of about 14°C, with a 34% chance of rain on a given day.
When is the rainy season in Swellendam?
Swellendam has no sharply defined rainy season: the chance of rain on a given day runs from 30% in February, the driest month, to 42% in September, the wettest.
What time of year is Swellendam windiest?
Winds in Swellendam are highest in January, averaging 3.3 m/s (12 km/h), and lightest in May, at 2.3 m/s (8 km/h). The prevailing wind is from the SW.
What is the average temperature in Swellendam year round?
The average temperature in Swellendam over the whole year is 17°C. January is the hottest month, with highs of about 28°C; July is the coldest, with lows of about 8°C.