S
M
T
W
T
F
S
28
71°
62°
29
71°
62°
30
86°
66°
1
93°
74°
2
95°
75°
3
90°
70°
4
87°
69°
5
80°
65°
6
82°
66°
7
82°
67°
8
82°
67°
9
83°
66°
10
84°
66°
11
85°
68°
12
85°
65°
13
82°
66°
14
81°
62°
15
76°
60°
16
77°
62°
17
77°
64°
18
78°
65°
19
81°
66°
20
82°
66°
21
79°
65°
22
82°
67°
23
80°
66°
24
80°
66°
25
79°
65°
26
81°
67°
27
82°
67°
28
84°
66°
29
84°
68°
30
85°
67°
31
84°
67°
1
81°
66°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
July Weather in St. Catharines
St. Catharines's July 2026 forecast shows daily high temperatures ranging from 76° to 95°, with overnight lows between 60° and 75°. The average high for July is 83° with an average low of 66°. 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 St. Catharines. See also: August | September | October.
