Weather Averages for Helsinki in September
| Average Temperature | 50°f (10°c) |
| Average Low Temperature | 43°f (6°c) |
| Average High Temperature | 57°f (14°c) |
| Average Sea Temperature | N/A (14°c) |
| Average Precipitation | 73mm |
| Average Rainfall Days | 18 Days |
| Average Daily Sunshine Hours | 4 Hrs |
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