Annual mean 17°C · wettest around June · prevailing wind NW
Warmest
31.0 °C
Coldest
9.4 °C
Wettest
39%
Windiest
3.7 m/s
Prevailing
NW
3.3 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 Isa over the whole year is 17°C. August is the hottest month, with highs of about 30°C; January is the coldest, with lows of about 5°C. The rainy (wet) season in Isa runs from May to July, peaking in June with a 33% chance of rain on a given day. The dry season is August to April; December is the driest month, at 11%. Winds in Isa are highest in February, averaging 3.0 m/s (11 km/h), and lightest in November, at 2.4 m/s (9 km/h). The prevailing wind is from the NW. The clearest skies in Isa come in November, when the sky is typically 61% covered; June is the cloudiest month, at 81%.
Month by month Isa 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
10°C
5°C
6°C
12%
61%
2.8 m/s
5
0
47
February
11°C
5°C
7°C
17%
66%
3.0 m/s
9
0
51
March
15°C
9°C
12°C
19%
66%
3.0 m/s
33
0
75
April
19°C
13°C
17°C
20%
70%
2.9 m/s
70
5
78
May
23°C
16°C
22°C
23%
75%
2.7 m/s
81
27
52
June
25°C
21°C
27°C
33%
81%
2.5 m/s
50
56
17
July
29°C
25°C
33°C
28%
76%
2.7 m/s
9
42
2
August
30°C
25°C
34°C
20%
68%
2.7 m/s
5
31
1
September
28°C
23°C
30°C
22%
74%
2.7 m/s
24
59
7
October
23°C
17°C
23°C
14%
65%
2.6 m/s
71
35
49
November
18°C
12°C
16°C
14%
61%
2.4 m/s
60
4
80
December
11°C
6°C
8°C
11%
62%
2.8 m/s
12
0
55
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 Isa weather by season
Year round, Isa has days of about 10°C at their warmest in January, its coolest month, and 30°C in August, its warmest; the coolest hours of the day run from 5°C to 25°C through the year, and the average temperature over the year is 17°C around the clock. Rain is most likely around June and least likely around December. 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.
Isa weather in winterDecember to February
High 11°CLow 5°CRain 14%
Winter in Isa has typical daily highs of about 11°C and lows of about 5°C, with a 14% chance of rain on a given day.
Isa weather in springMarch to May
High 19°CLow 13°CRain 21%
Spring in Isa has typical daily highs of about 19°C and lows of about 13°C, with a 21% chance of rain on a given day.
Isa weather in summerJune to August
High 28°CLow 23°CRain 27%
Summer in Isa has typical daily highs of about 28°C and lows of about 23°C, with a 27% chance of rain on a given day.
Isa weather in autumnSeptember to November
High 23°CLow 17°CRain 17%
Autumn in Isa has typical daily highs of about 23°C and lows of about 17°C, with a 17% chance of rain on a given day.
When is the rainy season in Isa?
The rainy (wet) season in Isa runs from May to July, peaking in June with a 33% chance of rain on a given day. The dry season is August to April; December is the driest month, at 11%.
What time of year is Isa windiest?
Winds in Isa are highest in February, averaging 3.0 m/s (11 km/h), and lightest in November, at 2.4 m/s (9 km/h). The prevailing wind is from the NW.
What is the average temperature in Isa year round?
The average temperature in Isa over the whole year is 17°C. August is the hottest month, with highs of about 30°C; January is the coldest, with lows of about 5°C.