S
M
T
W
T
F
S
29
77°
32°
30
77°
37°
31
57°
31°
1
59°
33°
2
64°
33°
3
43°
27°
4
60°
30°
5
66°
35°
6
66°
38°
7
71°
41°
8
59°
31°
9
53°
30°
10
54°
36°
11
55°
34°
12
60°
34°
13
58°
31°
14
63°
36°
15
68°
36°
16
62°
33°
17
67°
40°
18
69°
40°
19
69°
39°
20
68°
40°
21
68°
38°
22
60°
34°
23
55°
33°
24
54°
32°
25
55°
31°
26
56°
31°
27
65°
33°
28
57°
32°
29
59°
35°
30
69°
39°
1
70°
42°
2
71°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
April Weather in Thermopolis
Thermopolis's April 2026 forecast shows daily high temperatures ranging from 43° to 71°, with overnight lows between 27° and 43°. The average high for April is 62° with an average low of 35°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how April weather will actually feel in Thermopolis. See also: May | June | July.
