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Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Saint Mary, MT
Content continues below
May
Average Temperature
High
13°
Feels 12
Low
1°
Feels -2
Average Precipitation
3 Days
Rain amount
7.9mm
Snow amount
0.6cm
Content continues below
Daily Historical Averages
May 2026
S
M
T
W
T
F
S
1
2
3
4
5
6
7
8
9
10
11
18°
12
23°
13
21°
14
11°
15
9°
16
6°
17
8°
18
11°
19
13°
20
12°
21
14°
22
15°
23
16°
24
15°
25
13°
26
27
28
29
30
31
Forecast
Monday, May 11, 2026
Day
18°
Feels 18
Wind
20 km/h W
Gust
30 km/h
Humidity
24%
P.O.P
30%
Rain
<1 mm
Night
1°
Feels -1
Wind
15 km/h SW
Gust
23 km/h
Humidity
80%
P.O.P
10%
Historical Averages
May 11
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.