S
M
T
W
T
F
S
26
43°
37°
27
44°
35°
28
45°
39°
29
44°
35°
30
44°
37°
1
45°
37°
2
45°
40°
3
50°
43°
4
46°
42°
5
46°
39°
6
47°
39°
7
46°
40°
8
47°
40°
9
48°
41°
10
48°
44°
11
49°
42°
12
50°
45°
13
54°
46°
14
54°
45°
15
51°
45°
16
56°
46°
17
50°
43°
18
50°
43°
19
50°
44°
20
51°
44°
21
54°
47°
22
56°
47°
23
57°
46°
24
59°
49°
25
60°
51°
26
62°
53°
27
63°
52°
28
62°
51°
29
65°
51°
30
61°
50°
31
58°
48°
1
58°
48°
2
59°
50°
3
60°
45°
4
58°
50°
5
57°
49°
6
58°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Helsinki
Helsinki's May 2026 forecast shows daily high temperatures ranging from 43° to 65°, with overnight lows between 35° and 53°. The average high for May is 53° with an average low of 45°. 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.
