S
M
T
W
T
F
S
26
58°
40°
27
60°
45°
28
60°
49°
29
64°
49°
30
67°
49°
1
68°
48°
2
64°
51°
3
65°
55°
4
61°
50°
5
56°
50°
6
55°
46°
7
58°
46°
8
63°
52°
9
63°
49°
10
62°
51°
11
61°
52°
12
63°
51°
13
60°
49°
14
57°
48°
15
59°
49°
16
58°
50°
17
61°
50°
18
59°
49°
19
59°
48°
20
58°
47°
21
58°
46°
22
59°
46°
23
60°
48°
24
61°
51°
25
62°
53°
26
64°
53°
27
67°
52°
28
62°
50°
29
62°
48°
30
63°
52°
31
68°
54°
1
67°
53°
2
68°
54°
3
68°
53°
4
64°
54°
5
67°
55°
6
68°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Calais
Calais's May 2026 forecast shows daily high temperatures ranging from 55° to 68°, with overnight lows between 46° and 56°. The average high for May is 62° with an average low of 50°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Calais. See also: June | July | August.
