S
M
T
W
T
F
S
30
68°
46°
31
62°
45°
1
66°
47°
2
70°
46°
3
70°
43°
4
69°
37°
5
59°
37°
6
59°
38°
7
60°
35°
8
58°
33°
9
57°
37°
10
56°
36°
11
57°
41°
12
58°
43°
13
62°
40°
14
60°
44°
15
60°
40°
16
63°
35°
17
60°
33°
18
55°
41°
19
56°
41°
20
64°
40°
21
56°
37°
22
54°
32°
23
54°
32°
24
53°
31°
25
53°
31°
26
55°
33°
27
54°
37°
28
53°
38°
29
56°
32°
30
52°
37°
1
55°
38°
2
58°
37°
3
51°
36°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Calais
Calais's September 2026 forecast shows daily high temperatures ranging from 51° to 70°, with overnight lows between 31° and 47°. The average high for September is 59° with an average low of 38°. 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 Calais. See also: October | November | December.
