S
M
T
W
T
F
S
29
75°
40°
30
78°
60°
31
84°
67°
1
85°
68°
2
83°
67°
3
87°
68°
4
78°
51°
5
62°
42°
6
70°
38°
7
65°
41°
8
78°
43°
9
79°
57°
10
80°
55°
11
78°
60°
12
83°
60°
13
81°
69°
14
86°
68°
15
85°
66°
16
82°
57°
17
85°
57°
18
73°
48°
19
66°
40°
20
69°
44°
21
81°
53°
22
80°
54°
23
83°
63°
24
78°
60°
25
77°
55°
26
80°
64°
27
76°
63°
28
74°
51°
29
71°
50°
30
67°
50°
1
67°
49°
2
69°
52°
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 67° to 83°, with overnight lows between 49° and 64°. The average high for April is 75° with an average low of 55°. 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.
