S
M
T
W
T
F
S
26
76°
58°
27
71°
58°
28
74°
57°
29
76°
58°
30
73°
56°
31
72°
55°
1
71°
56°
2
72°
55°
3
74°
57°
4
75°
56°
5
77°
58°
6
78°
58°
7
75°
57°
8
72°
57°
9
73°
58°
10
74°
58°
11
77°
57°
12
78°
59°
13
78°
59°
14
77°
58°
15
78°
59°
16
77°
59°
17
78°
53°
18
78°
56°
19
77°
52°
20
72°
51°
21
72°
52°
22
73°
49°
23
72°
54°
24
72°
53°
25
73°
51°
26
71°
55°
27
71°
55°
28
74°
51°
29
71°
50°
30
72°
49°
31
71°
50°
1
72°
52°
2
72°
52°
3
74°
55°
4
74°
53°
5
73°
49°
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 78°, with overnight lows between 49° and 59°. The average high for August is 74° with an average low of 55°. 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.
