Annual mean 17°C · wettest around February · prevailing wind SW
Warmest
30.7 °C
Coldest
7.8 °C
Wettest
37%
Windiest
4.6 m/s
Prevailing
SW
3.5 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 Decatur over the whole year is 17°C. July is the hottest month, with highs of about 30°C; January is the coldest, with lows of about 3°C. Decatur has no sharply defined rainy season: the chance of rain on a given day runs from 23% in September, the driest month, to 32% in February, the wettest. Winds in Decatur are highest in February, averaging 3.2 m/s (12 km/h), and lightest in August, at 1.7 m/s (6 km/h). The prevailing wind is from the SW. The clearest skies in Decatur come in September, when the sky is typically 31% covered; February is the cloudiest month, at 50%.
Month by month Decatur 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
8°C
3°C
4°C
29%
46%
3.0 m/s
9
0
33
February
12°C
6°C
8°C
32%
50%
3.2 m/s
23
0
51
March
16°C
9°C
12°C
29%
40%
3.2 m/s
40
1
69
April
20°C
12°C
18°C
28%
37%
2.9 m/s
64
14
65
May
25°C
17°C
24°C
31%
40%
2.4 m/s
62
47
34
June
29°C
21°C
30°C
30%
33%
2.1 m/s
25
61
6
July
30°C
23°C
33°C
26%
32%
1.8 m/s
5
42
1
August
30°C
22°C
32°C
28%
35%
1.7 m/s
12
53
1
September
28°C
18°C
29°C
23%
31%
1.8 m/s
34
58
14
October
23°C
13°C
21°C
24%
33%
2.1 m/s
66
29
53
November
16°C
7°C
13°C
25%
36%
2.4 m/s
39
4
67
December
11°C
5°C
7°C
29%
47%
2.7 m/s
17
0
50
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 Decatur weather by season
Year round, Decatur has days of about 8°C at their warmest in January, its coolest month, and 30°C in July, its warmest; the coolest hours of the day run from 3°C to 23°C through the year, and the average temperature over the year is 17°C around the clock. Rain is most likely around February and least likely around September. 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.
Decatur weather in winterDecember to February
High 10°CLow 4°CRain 30%
Winter in Decatur has typical daily highs of about 10°C and lows of about 4°C, with a 30% chance of rain on a given day.
Decatur weather in springMarch to May
High 20°CLow 12°CRain 30%
Spring in Decatur has typical daily highs of about 20°C and lows of about 12°C, with a 30% chance of rain on a given day.
Decatur weather in summerJune to August
High 30°CLow 22°CRain 28%
Summer in Decatur has typical daily highs of about 30°C and lows of about 22°C, with a 28% chance of rain on a given day.
Decatur weather in autumnSeptember to November
High 22°CLow 13°CRain 24%
Autumn in Decatur has typical daily highs of about 22°C and lows of about 13°C, with a 24% chance of rain on a given day.
When is the rainy season in Decatur?
Decatur has no sharply defined rainy season: the chance of rain on a given day runs from 23% in September, the driest month, to 32% in February, the wettest.
What time of year is Decatur windiest?
Winds in Decatur are highest in February, averaging 3.2 m/s (12 km/h), and lightest in August, at 1.7 m/s (6 km/h). The prevailing wind is from the SW.
What is the average temperature in Decatur year round?
The average temperature in Decatur over the whole year is 17°C. July is the hottest month, with highs of about 30°C; January is the coldest, with lows of about 3°C.