Annual mean 18°C · wettest around December · prevailing wind SW
Warmest
31.7 °C
Coldest
10.8 °C
Wettest
41%
Windiest
3.8 m/s
Prevailing
SW
2.9 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 Irmo over the whole year is 18°C. July is the hottest month, with highs of about 32°C; January is the coldest, with lows of about 4°C. Irmo has no sharply defined rainy season: the chance of rain on a given day runs from 36% in October, the driest month, to 41% in December, the wettest. Winds in Irmo are highest in March, averaging 2.3 m/s (8 km/h), and lightest in September, at 1.5 m/s (5 km/h). The prevailing wind is from the SW. The clearest skies in Irmo come in October, when the sky is typically 31% covered; February is the cloudiest month, at 43%.
Month by month Irmo 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
11°C
4°C
7°C
39%
37%
2.0 m/s
16
1
49
February
15°C
7°C
12°C
38%
43%
2.1 m/s
38
3
64
March
18°C
9°C
15°C
39%
38%
2.3 m/s
53
7
71
April
22°C
13°C
20°C
38%
31%
2.3 m/s
70
25
59
May
26°C
18°C
26°C
39%
37%
2.1 m/s
55
54
28
June
30°C
22°C
31°C
39%
34%
1.9 m/s
19
61
5
July
32°C
24°C
34°C
40%
32%
1.8 m/s
3
36
0
August
30°C
23°C
33°C
39%
38%
1.6 m/s
10
45
2
September
28°C
20°C
29°C
37%
35%
1.5 m/s
32
59
11
October
24°C
14°C
23°C
36%
31%
1.5 m/s
67
37
47
November
17°C
8°C
15°C
38%
35%
1.6 m/s
48
8
72
December
13°C
6°C
10°C
41%
43%
1.8 m/s
24
1
60
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 Irmo weather by season
Year round, Irmo has days of about 11°C at their warmest in January, its coolest month, and 32°C in July, its warmest; the coolest hours of the day run from 4°C to 24°C through the year, and the average temperature over the year is 18°C around the clock. Rain is most likely around December and least likely around October. 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.
Irmo weather in winterDecember to February
High 13°CLow 6°CRain 39%
Winter in Irmo has typical daily highs of about 13°C and lows of about 6°C, with a 39% chance of rain on a given day.
Irmo weather in springMarch to May
High 22°CLow 13°CRain 38%
Spring in Irmo has typical daily highs of about 22°C and lows of about 13°C, with a 38% chance of rain on a given day.
Irmo weather in summerJune to August
High 30°CLow 23°CRain 39%
Summer in Irmo has typical daily highs of about 30°C and lows of about 23°C, with a 39% chance of rain on a given day.
Irmo weather in autumnSeptember to November
High 23°CLow 14°CRain 37%
Autumn in Irmo has typical daily highs of about 23°C and lows of about 14°C, with a 37% chance of rain on a given day.
When is the rainy season in Irmo?
Irmo has no sharply defined rainy season: the chance of rain on a given day runs from 36% in October, the driest month, to 41% in December, the wettest.
What time of year is Irmo windiest?
Winds in Irmo are highest in March, averaging 2.3 m/s (8 km/h), and lightest in September, at 1.5 m/s (5 km/h). The prevailing wind is from the SW.
What is the average temperature in Irmo year round?
The average temperature in Irmo over the whole year is 18°C. July is the hottest month, with highs of about 32°C; January is the coldest, with lows of about 4°C.