S
M
T
W
T
F
S
26
77°
63°
27
79°
61°
28
84°
59°
29
93°
63°
30
82°
63°
31
77°
57°
1
77°
54°
2
81°
55°
3
86°
61°
4
86°
61°
5
77°
59°
6
72°
52°
7
77°
46°
8
82°
55°
9
90°
55°
10
77°
59°
11
75°
57°
12
86°
57°
13
95°
57°
14
93°
66°
15
77°
63°
16
81°
55°
17
79°
61°
18
75°
63°
19
75°
59°
20
75°
57°
21
70°
55°
22
70°
50°
23
73°
50°
24
72°
50°
25
79°
55°
26
79°
61°
27
75°
63°
28
75°
59°
29
68°
61°
30
73°
61°
31
72°
51°
1
72°
54°
2
70°
63°
3
77°
64°
4
75°
56°
5
72°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Chelmsford
Chelmsford's August 2026 forecast shows daily high temperatures ranging from 70° to 77°, with overnight lows between 51° and 64°. The average high for August is 73° with an average low of 57°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Chelmsford. See also: September | October | November.
