S
M
T
W
T
F
S
26
46°
32°
27
47°
33°
28
44°
32°
29
50°
35°
30
59°
33°
1
N/A
2
55°
43°
3
51°
41°
4
46°
41°
5
48°
37°
6
48°
39°
7
48°
40°
8
48°
41°
9
49°
40°
10
50°
43°
11
48°
42°
12
50°
42°
13
49°
43°
14
58°
45°
15
62°
43°
16
56°
41°
17
57°
39°
18
57°
44°
19
59°
46°
20
58°
44°
21
58°
46°
22
59°
43°
23
58°
43°
24
58°
44°
25
59°
43°
26
60°
42°
27
59°
42°
28
60°
47°
29
64°
46°
30
62°
44°
31
60°
44°
1
61°
46°
2
60°
45°
3
61°
48°
4
61°
46°
5
62°
45°
6
63°
47°
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 46° to 64°, with overnight lows between 37° and 48°. The average high for May is 56° with an average low of 43°. 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.
