S
M
T
W
T
F
S
30
72°
53°
31
71°
52°
1
70°
51°
2
72°
51°
3
70°
53°
4
70°
50°
5
71°
54°
6
70°
52°
7
69°
51°
8
69°
53°
9
70°
55°
10
71°
52°
11
70°
53°
12
69°
50°
13
69°
48°
14
68°
47°
15
72°
49°
16
70°
50°
17
70°
50°
18
Hist. Avg.
69°
52°
19
Hist. Avg.
69°
52°
20
Hist. Avg.
69°
52°
21
Hist. Avg.
68°
52°
22
Hist. Avg.
68°
52°
23
Hist. Avg.
68°
52°
24
Hist. Avg.
68°
52°
25
Hist. Avg.
67°
51°
26
Hist. Avg.
67°
51°
27
Hist. Avg.
67°
51°
28
Hist. Avg.
67°
51°
29
Hist. Avg.
66°
51°
30
Hist. Avg.
66°
51°
1
Hist. Avg.
66°
51°
2
Hist. Avg.
66°
50°
3
Hist. Avg.
65°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Rennes
Rennes's September 2026 forecast shows daily high temperatures ranging from 68° to 72°, with overnight lows between 47° and 55°. The average high for September is 70° with an average low of 51°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Rennes. See also: October | November | December.
