S
M
T
W
T
F
S
26
58°
28°
27
48°
36°
28
47°
29°
29
41°
28°
30
46°
29°
1
54°
27°
2
65°
36°
3
72°
34°
4
51°
32°
5
38°
29°
6
43°
31°
7
54°
23°
8
62°
35°
9
54°
33°
10
52°
28°
11
67°
30°
12
61°
42°
13
73°
38°
14
78°
53°
15
78°
56°
16
56°
40°
17
55°
37°
18
49°
41°
19
46°
37°
20
64°
31°
21
69°
45°
22
64°
47°
23
58°
46°
24
78°
49°
25
89°
57°
26
89°
57°
27
85°
60°
28
91°
59°
29
91°
67°
30
84°
61°
31
82°
61°
1
80°
61°
2
85°
62°
3
81°
59°
4
78°
53°
5
72°
53°
6
73°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Thief River Falls
Thief River Falls's May 2026 forecast shows daily high temperatures ranging from 72° to 85°, with overnight lows between 53° and 62°. The average high for May is 79° with an average low of 58°. 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 Thief River Falls. See also: June | July | August.
