S
M
T
W
T
F
S
30
75°
59°
31
75°
58°
1
78°
60°
2
76°
61°
3
76°
59°
4
77°
58°
5
76°
57°
6
73°
57°
7
71°
56°
8
70°
57°
9
71°
55°
10
69°
51°
11
77°
49°
12
71°
46°
13
69°
52°
14
71°
51°
15
67°
49°
16
68°
50°
17
70°
49°
18
70°
50°
19
69°
47°
20
64°
47°
21
65°
48°
22
62°
52°
23
70°
47°
24
70°
43°
25
67°
51°
26
69°
50°
27
66°
50°
28
63°
49°
29
63°
50°
30
68°
44°
1
67°
49°
2
66°
50°
3
69°
44°
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 62° to 78°, with overnight lows between 43° and 61°. The average high for September is 70° with an average low of 52°. 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.
