S
M
T
W
T
F
S
26
51°
45°
27
51°
46°
28
50°
42°
29
45°
40°
30
46°
39°
1
48°
38°
2
47°
39°
3
47°
40°
4
46°
40°
5
47°
37°
6
44°
35°
7
47°
34°
8
46°
39°
9
46°
36°
10
45°
34°
11
47°
35°
12
47°
34°
13
45°
35°
14
45°
35°
15
46°
38°
16
46°
42°
17
50°
43°
18
51°
42°
19
51°
41°
20
49°
41°
21
51°
42°
22
49°
42°
23
52°
43°
24
53°
41°
25
53°
43°
26
54°
44°
27
54°
44°
28
53°
43°
29
53°
44°
30
52°
44°
31
53°
43°
1
53°
44°
2
52°
45°
3
53°
45°
4
52°
44°
5
54°
45°
6
55°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Reykjavik
Reykjavik's May 2026 forecast shows daily high temperatures ranging from 44° to 55°, with overnight lows between 34° and 46°. The average high for May is 50° with an average low of 41°. 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 Reykjavik. See also: June | July | August.
