S
M
T
W
T
F
S
29
87°
56°
30
85°
60°
31
71°
56°
1
73°
53°
2
70°
52°
3
76°
45°
4
82°
51°
5
88°
54°
6
87°
58°
7
83°
52°
8
83°
52°
9
83°
60°
10
74°
51°
11
73°
48°
12
66°
45°
13
70°
43°
14
75°
43°
15
73°
46°
16
72°
44°
17
78°
46°
18
84°
50°
19
75°
51°
20
73°
49°
21
75°
49°
22
77°
50°
23
76°
48°
24
70°
45°
25
71°
48°
26
70°
47°
27
70°
45°
28
71°
44°
29
71°
46°
30
72°
45°
1
72°
46°
2
73°
51°
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 66° to 84°, with overnight lows between 43° and 51°. The average high for April is 73° with an average low of 47°. 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.
