S
M
T
W
T
F
S
29
82°
43°
30
82°
50°
31
61°
39°
1
52°
35°
2
72°
35°
3
55°
33°
4
62°
25°
5
67°
29°
6
65°
31°
7
74°
32°
8
69°
40°
9
73°
40°
10
65°
43°
11
76°
44°
12
77°
45°
13
72°
42°
14
58°
39°
15
67°
43°
16
64°
36°
17
61°
37°
18
72°
42°
19
73°
41°
20
69°
40°
21
71°
41°
22
64°
33°
23
62°
35°
24
58°
30°
25
58°
32°
26
64°
36°
27
67°
38°
28
64°
39°
29
62°
36°
30
60°
33°
1
60°
36°
2
59°
31°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
April Weather in Longmont
Longmont's April 2026 forecast shows daily high temperatures ranging from 58° to 77°, with overnight lows between 30° and 45°. The average high for April is 66° with an average low of 38°. 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 Longmont. See also: May | June | July.
