S
M
T
W
T
F
S
26
70°
29°
27
63°
31°
28
63°
27°
29
49°
36°
30
54°
41°
1
58°
31°
2
59°
28°
3
46°
41°
4
61°
35°
5
75°
36°
6
61°
49°
7
64°
35°
8
54°
31°
9
64°
29°
10
55°
44°
11
65°
46°
12
57°
36°
13
64°
29°
14
68°
42°
15
65°
38°
16
78°
35°
17
77°
42°
18
67°
42°
19
77°
45°
20
88°
49°
21
63°
38°
22
68°
31°
23
69°
29°
24
71°
33°
25
60°
45°
26
81°
59°
27
78°
47°
28
55°
43°
29
59°
42°
30
54°
37°
31
56°
43°
1
63°
43°
2
68°
49°
3
76°
53°
4
81°
55°
5
74°
56°
6
74°
55°
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 54° to 81°, with overnight lows between 37° and 59°. The average high for May is 68° with an average low of 49°. 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.
