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Precipitation
Temperature
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°Fahrenheit
Monthly Historical Averages
Lewistown, MT
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May
Average Temperature
High
16°
Feels 15
Low
4°
Feels 1
Average Precipitation
13 Days
Rain amount
63.9mm
Snow amount
2.1cm
Daily Historical Averages
May 2026
S
M
T
W
T
F
S
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
28°
25
29°
26
30°
27
24°
28
24°
29
26°
30
20°
31
21°
Forecast
Sunday, May 24, 2026
Day
28°
Feels 28
Wind
30 km/h NW
Gust
45 km/h
Humidity
17%
P.O.P
20%
Night
8°
Feels 5
Wind
27 km/h S
Gust
41 km/h
Humidity
61%
P.O.P
10%
Historical Averages
May 24
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.