Helsinki weather in September 2025
Mon
Tue
Wed
Thu
Fri
Sat
Sun
1 September
+17°+11°
2 September
+17°+10°
3 September
+16°+10°
4 September
+17°+10°
5 September
+18°+10°
6 September
+17°+10°
7 September
+17°+10°
8 September
+17°+10°
9 September
+17°+10°
10 September
+18°+11°
11 September
+17°+12°
12 September
+17°+12°
13 September
+17°+11°
14 September
+16°+10°
15 September
+15°+10°
16 September
+15°+9°
17 September
+15°+10°
18 September
+15°+9°
19 September
+15°+10°
20 September
+15°+9°
21 September
+14°+9°
22 September
+14°+9°
23 September
+12°+8°
24 September
+13°+8°
25 September
+13°+8°
26 September
+13°+7°
27 September
+14°+8°
28 September
+13°+8°
29 September
+12°+7°
30 September
+13°+7°
1 October
+12°+5°
2 October
+12°+5°
3 October
+12°+7°
4 October
+12°+7°
5 October
+11°+6°
