S
M
T
W
T
F
S
26
42°
27°
27
45°
27°
28
40°
30°
29
47°
30°
30
50°
26°
1
65°
24°
2
64°
33°
3
72°
33°
4
42°
29°
5
41°
26°
6
48°
20°
7
56°
18°
8
58°
28°
9
51°
24°
10
53°
18°
11
59°
31°
12
70°
35°
13
83°
36°
14
76°
54°
15
55°
31°
16
45°
29°
17
43°
27°
18
42°
35°
19
52°
27°
20
65°
24°
21
60°
42°
22
N/A
23
57°
39°
24
73°
51°
25
72°
49°
26
76°
53°
27
78°
56°
28
78°
56°
29
74°
53°
30
72°
52°
31
73°
57°
1
69°
50°
2
68°
48°
3
66°
50°
4
65°
44°
5
58°
41°
6
59°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
May Weather in Reykjavik
Reykjavik's May 2026 forecast shows daily high temperatures ranging from 57° to 78°, with overnight lows between 39° and 57°. The average high for May is 69° 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 Reykjavik. See also: June | July | August.
