The climate of Porsgrunn in September is humid. An average of 108 mm precipitation is recorded over 14 days. The situation is drier than the previous month: in August, the average recorded is 117 mm over 17 days.
Temperatures are rather cool in Porsgrunn in September, but remain tolerable with appropriate clothing. The average maximum temperature reaches 16°C, while the minimum falls to about 10°C. The month's average temperature is 13°C. These normals should be compared with the records recorded in Porsgrunn in September: 28°C as a maximum in 2021 and 3°C as a minimum in 2010. We can expect about 8 days with temperatures above 18°, i.e. 27% of the month.
In September, the days last on average 12:50 in Porsgrunn. The sun rises around 05:51 and sets around 18:41.
With favorable weather, the month of September is a good month to travel to Porsgrunn in Norway.
Some activities remain possible even if conditions are not optimal: Beach and swimming, Nature and landscapes and Boat trip and cruise.
By contrast, these activities are not recommended or are ill-suited in Porsgrunn in September: Winter sports and snow.
