Average data for 10 years
1 September
Monday
+17°
+9°
2 September
Tuesday
+16°
+9°
3 September
Wednesday
+17°
+10°
4 September
Thursday
+17°
+10°
5 September
Friday
+17°
+9°
6 September
Saturday
+17°
+9°
7 September
Sunday
+17°
+9°
8 September
Monday
+17°
+10°
9 September
Tuesday
+16°
+10°
10 September
Wednesday
+16°
+10°
11 September
Thursday
+16°
+10°
12 September
Friday
+16°
+10°
13 September
Saturday
+15°
+9°
14 September
Sunday
+15°
+8°
15 September
Monday
+14°
+7°
16 September
Tuesday
+14°
+7°
17 September
Wednesday
+14°
+7°
18 September
Thursday
+14°
+7°
19 September
Friday
+14°
+8°
20 September
Saturday
+14°
+7°
21 September
Sunday
+14°
+7°
22 September
Monday
+14°
+7°
23 September
Tuesday
+13°
+6°
24 September
Wednesday
+13°
+7°
25 September
Thursday
+13°
+6°
26 September
Friday
+13°
+7°
27 September
Saturday
+13°
+7°
28 September
Sunday
+12°
+7°
29 September
Monday
+12°
+6°
30 September
Tuesday
+12°
+6°
Cities with similar weather in September
Latvia
Riga
Sweden
Stockholm
Norway
Oslo
Latvia
Yurmala
Lithuania
Palanga
In September, the weather in Helsinki is typically warm. Average daily high temperature in September is about 15 degrees above zero. On average, Helsinki has 11 rainy, 9 partly cloudy, 6 cloudy, and 4 sunny days in September. The rains are usually moderate.