S
M
T
W
T
F
S
26
46°
32°
27
47°
33°
28
44°
32°
29
50°
35°
30
59°
33°
1
70°
41°
2
71°
35°
3
61°
41°
4
53°
45°
5
53°
40°
6
51°
31°
7
56°
33°
8
59°
37°
9
56°
29°
10
56°
33°
11
58°
43°
12
60°
48°
13
65°
50°
14
56°
45°
15
62°
45°
16
66°
46°
17
62°
45°
18
68°
36°
19
74°
54°
20
64°
54°
21
64°
48°
22
63°
47°
23
77°
50°
24
N/A
25
60°
46°
26
61°
45°
27
57°
46°
28
56°
45°
29
56°
46°
30
56°
46°
31
56°
48°
1
58°
47°
2
56°
48°
3
56°
49°
4
58°
50°
5
56°
49°
6
70°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
May Weather in Helsinki
Helsinki's May 2026 forecast shows daily high temperatures ranging from 56° to 70°, with overnight lows between 45° and 51°. The average high for May is 58° with an average low of 47°. 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 Helsinki. See also: June | July | August.
