S
M
T
W
T
F
S
30
80°
44°
31
77°
50°
1
76°
45°
2
73°
44°
3
62°
49°
4
76°
60°
5
69°
50°
6
65°
50°
7
77°
47°
8
69°
40°
9
63°
35°
10
81°
55°
11
67°
42°
12
74°
41°
13
64°
41°
14
71°
46°
15
71°
41°
16
75°
42°
17
71°
48°
18
75°
44°
19
65°
44°
20
63°
33°
21
68°
44°
22
66°
36°
23
66°
32°
24
73°
39°
25
74°
49°
26
67°
52°
27
65°
51°
28
61°
53°
29
62°
53°
30
67°
55°
1
73°
58°
2
72°
53°
3
71°
54°
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 61° to 74°, with overnight lows between 39° and 58°. The average high for September is 69° 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.
