Annual mean 12°C · wettest around December · prevailing wind SW
Warmest
23.4 °C
Coldest
3.7 °C
Wettest
36%
Windiest
5.1 m/s
Prevailing
SW
4.0 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
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 Issum over the whole year is 12°C. August is the hottest month, with highs of about 23°C; January is the coldest, with lows of about 3°C. Issum has no sharply defined rainy season: the chance of rain on a given day runs from 17% in May, the driest month, to 31% in December, the wettest. Winds in Issum are highest in February, averaging 4.0 m/s (14 km/h), and lightest in September, at 2.4 m/s (9 km/h). The prevailing wind is from the SW. The clearest skies in Issum come in August, when the sky is typically 56% covered; December is the cloudiest month, at 79%.
Month by month Issum 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
5°C
3°C
1°C
30%
78%
3.8 m/s
0
0
10
February
7°C
4°C
2°C
29%
68%
4.0 m/s
1
0
21
March
10°C
4°C
5°C
24%
65%
3.5 m/s
5
0
40
April
13°C
7°C
9°C
19%
59%
3.1 m/s
19
1
62
May
18°C
11°C
15°C
17%
57%
2.8 m/s
53
5
78
June
22°C
16°C
20°C
18%
57%
2.7 m/s
75
23
63
July
23°C
16°C
21°C
18%
61%
2.6 m/s
78
20
62
August
23°C
16°C
22°C
18%
56%
2.6 m/s
75
26
57
September
20°C
12°C
18°C
20%
56%
2.4 m/s
66
11
73
October
15°C
10°C
12°C
24%
66%
3.0 m/s
30
0
78
November
9°C
6°C
6°C
26%
70%
3.2 m/s
1
0
41
December
6°C
5°C
2°C
31%
79%
3.7 m/s
0
0
17
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 Issum weather by season
Year round, Issum has days of about 5°C at their warmest in January, its coolest month, and 23°C in August, its warmest; the coolest hours of the day run from 3°C to 16°C through the year, and the average temperature over the year is 12°C around the clock. Rain is most likely around December and least likely around May. 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.
Issum weather in winterDecember to February
High 6°CLow 4°CRain 30%
Winter in Issum has typical daily highs of about 6°C and lows of about 4°C, with a 30% chance of rain on a given day.
Issum weather in springMarch to May
High 14°CLow 7°CRain 20%
Spring in Issum has typical daily highs of about 14°C and lows of about 7°C, with a 20% chance of rain on a given day.
Issum weather in summerJune to August
High 22°CLow 16°CRain 18%
Summer in Issum has typical daily highs of about 22°C and lows of about 16°C, with a 18% chance of rain on a given day.
Issum weather in autumnSeptember to November
High 15°CLow 10°CRain 23%
Autumn in Issum has typical daily highs of about 15°C and lows of about 10°C, with a 23% chance of rain on a given day.
When is the rainy season in Issum?
Issum has no sharply defined rainy season: the chance of rain on a given day runs from 17% in May, the driest month, to 31% in December, the wettest.
What time of year is Issum windiest?
Winds in Issum are highest in February, averaging 4.0 m/s (14 km/h), and lightest in September, at 2.4 m/s (9 km/h). The prevailing wind is from the SW.
What is the average temperature in Issum year round?
The average temperature in Issum over the whole year is 12°C. August is the hottest month, with highs of about 23°C; January is the coldest, with lows of about 3°C.