S
M
T
W
T
F
S
29
90°
45°
30
87°
41°
31
62°
43°
1
54°
33°
2
70°
37°
3
65°
37°
4
63°
28°
5
70°
25°
6
60°
36°
7
67°
32°
8
69°
38°
9
78°
40°
10
55°
49°
11
76°
55°
12
85°
48°
13
86°
43°
14
57°
34°
15
64°
39°
16
76°
47°
17
78°
44°
18
73°
43°
19
77°
49°
20
77°
45°
21
67°
35°
22
62°
43°
23
67°
42°
24
62°
41°
25
63°
43°
26
67°
45°
27
72°
46°
28
73°
46°
29
74°
45°
30
68°
43°
1
66°
44°
2
63°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
April Weather in Herndon
Herndon's April 2026 forecast shows daily high temperatures ranging from 55° to 86°, with overnight lows between 34° and 55°. The average high for April is 70° with an average low of 44°. 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 Herndon. See also: May | June | July.
