S
M
T
W
T
F
S
26
49°
43°
27
44°
34°
28
43°
35°
29
43°
36°
30
45°
36°
1
46°
37°
2
45°
38°
3
44°
37°
4
46°
36°
5
46°
33°
6
44°
34°
7
45°
40°
8
46°
38°
9
47°
39°
10
48°
40°
11
47°
40°
12
46°
41°
13
46°
38°
14
47°
39°
15
46°
40°
16
46°
41°
17
50°
40°
18
47°
37°
19
46°
38°
20
47°
38°
21
47°
39°
22
49°
42°
23
52°
43°
24
52°
43°
25
53°
42°
26
50°
41°
27
48°
39°
28
48°
38°
29
49°
39°
30
48°
39°
31
49°
40°
1
52°
42°
2
52°
43°
3
53°
44°
4
53°
44°
5
52°
45°
6
54°
45°
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 43° to 54°, with overnight lows between 33° and 45°. The average high for May is 48° with an average low of 39°. 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.
