Porvoo Weather: September
 |
Average Day Temperature: | 59.3°F |
|
Average Night Temperature: | 54.5°F |
|
Sea Water Temperature: | 59.5°F |
|
Number of Sunny Days: | 10 days |
| Sunshine Hours: | 11.5 - 14.2 hours | |
|
Number of Rainy Days: | 4 days |
| Precipitation Totals: | 2.1 in | |
| detailed information | ||
forecast
| Porvoo |
Temperature
| Porvoo |
Air Temperature in September, °F
The highest day temperature in September 2025 was 67°F. The lowest night temperature was 42°F. The average values for day and night temperatures during September were 60.0°F и 57.1°F respectivly.
Porvoo Water Sea Temperature in September, °F
The average sea surface temperature in September 2025 for Porvoo was 60.1°F. The maximum and minimum values were 52.6°F and 65.6°F respectively.
You can expect various weather conditions during September. Be ready for sunny, cloudy or even gloomy days.
Precipitation Totals in September, in
Precipitation total in September for Porvoo is 2.1 in. It makes september one of the most rainy months of the year.
The average wind speed in September is 12.5 mph.
We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Porvoo in September is 6.9 hours.
Porvoo on the Weather Map
| Espoo |  |
+26 |
| Helsinki | |
+26 |
| Imatra |  |
+32 |
| Juvaskyla |  |
+22 |
| Kemi | |
+26 |
| Lahti | |
+24 |
| Lappeenranta | |
+32 |
| Oulu | |
+28 |
| Pori | |
+32 |
| Porvoo | |
+26 |
| Saariselka | |
+30 |
| Seinajoki | |
+26 |
| Turku |  |
+28 |
| Vaasa | |
+28 |
| Vantaa | |
+26 |
| 0600 |  |
26°F | NE 8 mph |
| 0900 |  |
30°F | NE 11 mph |
| 1200 |  |
34°F | NE 14 mph |
| 1500 |  |
34°F | NE 14 mph |
| 1800 | |
32°F | NE 11 mph |
| 2100 | |
30°F | NE 11 mph |
| 0000 |  |
30°F | NE 11 mph |
| 0300 | |
30°F | NE 10 mph |