S
M
T
W
T
F
S
26
61°
31°
27
63°
34°
28
57°
32°
29
44°
39°
30
46°
41°
1
59°
36°
2
50°
30°
3
45°
39°
4
59°
36°
5
58°
45°
6
55°
49°
7
60°
39°
8
57°
38°
9
58°
31°
10
55°
47°
11
61°
45°
12
56°
40°
13
55°
40°
14
64°
46°
15
60°
51°
16
73°
51°
17
78°
44°
18
68°
48°
19
76°
56°
20
82°
46°
21
60°
39°
22
58°
40°
23
59°
42°
24
60°
46°
25
61°
46°
26
62°
47°
27
61°
49°
28
62°
49°
29
61°
46°
30
62°
50°
31
65°
49°
1
62°
48°
2
61°
48°
3
61°
47°
4
62°
50°
5
62°
51°
6
64°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Columbia Falls
Columbia Falls's May 2026 forecast shows daily high temperatures ranging from 58° to 82°, with overnight lows between 39° and 56°. The average high for May is 65° with an average low of 47°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Columbia Falls. See also: June | July | August.
