Annual mean 17°C · wettest around December · prevailing wind W
Warmest
30.5 °C
Coldest
9.4 °C
Wettest
33%
Windiest
4.2 m/s
Prevailing
W
3.4 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 18% in October, the driest month, to 28% in December, the wettest. Winds in Decatur are highest in January, averaging 2.8 m/s (10 km/h), and lightest in July, at 1.9 m/s (7 km/h). The prevailing wind is from the W. The clearest skies in Decatur come in October, when the sky is typically 36% covered; February is the cloudiest month, at 52%.
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
10°C
3°C
5°C
28%
46%
2.8 m/s
12
0
39
February
14°C
7°C
10°C
24%
52%
2.7 m/s
30
1
61
March
17°C
9°C
14°C
26%
44%
2.8 m/s
48
3
72
April
21°C
12°C
18°C
23%
38%
2.6 m/s
67
15
65
May
25°C
17°C
24°C
25%
44%
2.4 m/s
63
47
34
June
29°C
22°C
30°C
24%
43%
2.1 m/s
28
64
6
July
30°C
23°C
33°C
23%
41%
1.9 m/s
6
52
0
August
30°C
22°C
32°C
24%
43%
1.9 m/s
12
56
2
September
28°C
19°C
28°C
22%
38%
1.9 m/s
39
58
17
October
23°C
13°C
21°C
18%
36%
2.0 m/s
71
27
55
November
16°C
8°C
13°C
22%
40%
2.2 m/s
43
4
71
December
12°C
6°C
8°C
28%
49%
2.5 m/s
19
0
53
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 10°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 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.
Decatur weather in winterDecember to February
High 12°CLow 5°CRain 27%
Winter in Decatur has typical daily highs of about 12°C and lows of about 5°C, with a 27% chance of rain on a given day.
Decatur weather in springMarch to May
High 21°CLow 13°CRain 25%
Spring in Decatur has typical daily highs of about 21°C and lows of about 13°C, with a 25% chance of rain on a given day.
Decatur weather in summerJune to August
High 30°CLow 22°CRain 24%
Summer in Decatur has typical daily highs of about 30°C and lows of about 22°C, with a 24% chance of rain on a given day.
Decatur weather in autumnSeptember to November
High 22°CLow 13°CRain 21%
Autumn in Decatur has typical daily highs of about 22°C and lows of about 13°C, with a 21% 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 18% in October, the driest month, to 28% in December, the wettest.
What time of year is Decatur windiest?
Winds in Decatur are highest in January, averaging 2.8 m/s (10 km/h), and lightest in July, at 1.9 m/s (7 km/h). The prevailing wind is from the W.
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.