Weather in Helsinki in September
Climate normals based on 10 years of historical data for Helsinki, Finlandia.
Average high
15°C
Average low
11°C
Rainfall
74 mm
10 rainy days
Sunshine
3.0h/day
Kelembapan
79%
How Hot Is Helsinki in September?
September in Helsinki averages 15°C in the afternoon and 11°C overnight, with a typical daily mean of 13°C. Temperatures climb 5°C over August's averages in Helsinki.
Sunshine Hours in September
Heavy overcast keeps sun limited in Helsinki: just 3.0h a day in September.
Does It Rain In Helsinki In September?
Helsinki averages a rainy day every other day in September — 74mm in total, across 10 days.
Is Helsinki Humid In September?
Expect heavy, oppressive air in Helsinki — humidity peaks at 79% on average.
Wind In Helsinki In September
Wind picks up in Helsinki during September — averaging 21 kph, with gustier afternoons.
Cloud Cover In Helsinki In September
Helsinki's September runs cloudy: typical cloud cover of 67%.
Cities With Similar Weather In September
Weather in Helsinki, month by month
| Month | High / Low | Hujan | |
|---|---|---|---|
| Cuaca di Bulan Januari | -1°C / -5°C | 68mm | Details → |
| Cuaca di Bulan Februari | -1°C / -5°C | 63mm | Details → |
| Cuaca di Bulan Maret | 2°C / -3°C | 49mm | Details → |
| Cuaca di Bulan April | 7°C / 1°C | 45mm | Details → |
| Cuaca di Bulan Mei | 13°C / 6°C | 49mm | Details → |
| Cuaca di Bulan Juni | 18°C / 12°C | 60mm | Details → |
| Cuaca di Bulan Juli | 20°C / 14°C | 86mm | Details → |
| Cuaca di Bulan Agustus | 20°C / 14°C | 88mm | Details → |
| Cuaca di Bulan September | 15°C / 11°C | 74mm | |
| Cuaca di Bulan Oktober | 9°C / 5°C | 82mm | Details → |
| Cuaca di Bulan November | 5°C / 2°C | 78mm | Details → |
| Cuaca di Bulan Desember | 1°C / -2°C | 67mm | Details → |