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7 Days
14 Days
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Monthly
Precipitation
Temperature
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Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Decatur, IN
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Daily Historical Averages
May 2026
S
M
T
W
T
F
S
1
11°
2
10°
3
15°
4
21°
5
17°
6
15°
7
12°
8
14°
9
18°
10
18°
11
18°
12
18°
13
19°
14
21°
15
20°
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Forecast
Friday, May 1, 2026
Day
11°
Feels 9
Wind
22 km/h N
Gust
38 km/h
Humidity
50%
P.O.P
80%
Rain
1-3 mm
Night
-1°
Feels -5
Wind
21 km/h NW
Gust
36 km/h
Humidity
86%
P.O.P
30%
Historical Averages
May 1
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.
May
Average Temperature
High
22°
Feels 22
Low
11°
Feels 10
Average Precipitation
13 Days
Rain amount
91.9mm
Snow amount
0cm