Porvoo in September
6.7out of 10
Possible, with caveats
Mild: highs around 15°C. Frequent rain: about 10 rainy days.
15°CAvg high
7°CAvg low
10Rainy days (51 mm)
12:31 hDaylight
06:56Sunrise · 19:27 Sunset
Why this score
- Mild: highs around 15°C
- Frequent rain: about 10 rainy days
- Rain varies a lot between years (±4.6 days)
What to wear and pack
- Layers you can add or remove
- Rain jacket or compact umbrella
How reliable is the forecast?
Rain in September varies a lot between years (±4.6 rainy days), so check the forecast closer to your trip. Averages cover 30 years (1991–2020). Individual days can differ a lot.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | -2°C | -7°C | 45 mm | 10 | – | – | 3.7 |
| February | -2°C | -8°C | 39 mm | 9 | – | – | 3.9 |
| March | 2°C | -6°C | 36 mm | 8 | – | – | 4.3 |
| April | 9°C | 0°C | 36 mm | 9 | – | – | 5.6 |
| May | 15°C | 5°C | 45 mm | 9 | – | – | 6.8 |
| June | 19°C | 10°C | 71 mm | 12 | – | – | 7.1 |
| July | 22°C | 13°C | 67 mm | 11 | – | – | 7.6 |
| August | 21°C | 11°C | 65 mm | 12 | – | – | 7.3 |
| September | 15°C | 7°C | 51 mm | 10 | – | – | 6.7 |
| October | 8°C | 3°C | 55 mm | 11 | – | – | 5.4 |
| November | 3°C | -1°C | 54 mm | 11 | – | – | 4.4 |
| December | 0°C | -4°C | 53 mm | 12 | – | – | 3.5 |
Frequently asked questions
How hot is Porvoo in September?
Daytime highs average 15°C and nights about 7°C.
When is the best time to visit Porvoo?
The best months are July, August, June.