S
M
T
W
T
F
S
28
80°
56°
29
80°
64°
30
82°
57°
1
77°
56°
2
77°
55°
3
78°
57°
4
78°
57°
5
79°
56°
6
77°
57°
7
77°
57°
8
78°
58°
9
77°
60°
10
78°
61°
11
80°
60°
12
84°
65°
13
85°
66°
14
82°
62°
15
78°
59°
16
77°
58°
17
79°
61°
18
79°
57°
19
80°
59°
20
79°
58°
21
79°
58°
22
80°
59°
23
82°
59°
24
82°
60°
25
81°
58°
26
83°
64°
27
86°
63°
28
86°
58°
29
79°
57°
30
78°
58°
31
79°
59°
1
80°
60°
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 77° to 86°, with overnight lows between 55° and 66°. The average high for July is 80° with an average low of 59°. 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.
