S
M
T
W
T
F
S
26
86°
62°
27
86°
63°
28
77°
62°
29
79°
67°
30
80°
65°
31
81°
64°
1
82°
65°
2
83°
69°
3
77°
63°
4
82°
62°
5
85°
60°
6
84°
66°
7
84°
69°
8
84°
66°
9
80°
66°
10
79°
65°
11
79°
63°
12
78°
57°
13
N/A
14
76°
55°
15
75°
57°
16
77°
63°
17
77°
58°
18
78°
61°
19
79°
59°
20
76°
57°
21
74°
58°
22
74°
56°
23
75°
57°
24
73°
56°
25
73°
57°
26
72°
50°
27
78°
59°
28
69°
53°
29
71°
58°
30
74°
58°
31
74°
57°
1
76°
59°
2
77°
58°
3
76°
57°
4
74°
57°
5
73°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Longueuil
Longueuil's August 2026 forecast shows daily high temperatures ranging from 69° to 79°, with overnight lows between 50° and 63°. The average high for August is 75° 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 Longueuil. See also: September | October | November.
