S
M
T
W
T
F
S
26
69°
60°
27
69°
59°
28
68°
60°
29
69°
60°
30
69°
59°
31
64°
60°
1
68°
59°
2
64°
60°
3
64°
60°
4
65°
59°
5
68°
60°
6
65°
60°
7
65°
55°
8
65°
54°
9
64°
55°
10
64°
58°
11
66°
56°
12
64°
54°
13
64°
54°
14
65°
59°
15
64°
54°
16
64°
55°
17
65°
54°
18
64°
55°
19
64°
54°
20
65°
53°
21
64°
56°
22
65°
53°
23
64°
53°
24
64°
54°
25
63°
53°
26
63°
53°
27
64°
56°
28
65°
56°
29
65°
57°
30
66°
57°
31
65°
56°
1
66°
58°
2
65°
55°
3
65°
53°
4
66°
55°
5
66°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Waltham
Waltham's August 2026 forecast shows daily high temperatures ranging from 63° to 69°, with overnight lows between 53° and 60°. The average high for August is 65° with an average low of 56°. 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 Waltham. See also: September | October | November.
