S
M
T
W
T
F
S
28
78°
66°
29
89°
76°
30
87°
71°
1
82°
66°
2
78°
66°
3
84°
65°
4
77°
61°
5
78°
61°
6
82°
66°
7
82°
66°
8
85°
66°
9
84°
64°
10
81°
65°
11
80°
66°
12
86°
66°
13
87°
64°
14
86°
63°
15
82°
61°
16
83°
63°
17
74°
59°
18
76°
63°
19
81°
63°
20
81°
62°
21
82°
64°
22
83°
64°
23
83°
63°
24
82°
63°
25
82°
64°
26
80°
64°
27
81°
63°
28
81°
64°
29
79°
62°
30
81°
63°
31
76°
60°
1
75°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
July Weather in Waltham
Waltham's July 2026 forecast shows daily high temperatures ranging from 74° to 87°, with overnight lows between 57° and 66°. The average high for July is 81° with an average low of 63°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how July weather will actually feel in Waltham. See also: August | September | October.
