S
M
T
W
T
F
S
26
77°
59°
27
77°
58°
28
76°
59°
29
76°
59°
30
78°
60°
31
79°
60°
1
78°
59°
2
77°
58°
3
74°
53°
4
73°
52°
5
73°
54°
6
74°
55°
7
73°
53°
8
74°
52°
9
74°
55°
10
75°
54°
11
73°
58°
12
78°
57°
13
78°
57°
14
75°
53°
15
73°
54°
16
76°
55°
17
73°
52°
18
74°
57°
19
72°
51°
20
74°
54°
21
74°
56°
22
77°
52°
23
74°
51°
24
72°
51°
25
72°
53°
26
71°
50°
27
71°
49°
28
72°
52°
29
75°
53°
30
76°
53°
31
75°
55°
1
75°
48°
2
72°
54°
3
74°
54°
4
74°
53°
5
73°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Rennes
Rennes's August 2026 forecast shows daily high temperatures ranging from 71° to 79°, with overnight lows between 48° and 60°. The average high for August is 75° with an average low of 54°. 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 Rennes. See also: September | October | November.
