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Hourly Forecast
Daylight Hours
07:24
Sunrise
19:00
Sunset
Moon
Waxing Gibbous
18:40
Moonrise
05:21
Moonset
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View stargazing scoreWeather in Porsgrunn today, September 25, 2026
Expect reduced visibility in Porsgrunn on September 25, 2026 where fog patches form. Allow more time for morning journeys if the air stays thick. Expect a grey start, with morning cloud around 100% by 09:00. Outdoor plans early on should not rely on bright skies.
The day peaks near 18°C and cools toward 13°C. The air stays humid, with relative humidity between 64% and 98% and the peak around 09:00. Winds stay light, near 3.9 km/h by 19:00, so the day feels still more than breezy.
Through the afternoon cloud remains the main feature, with cover near 100% around 12:00. Bright spells should stay limited even as the day wears on. Horizontal visibility sits around 29.9 km, briefly nearer 7.2 km. Sunrise is at 07:24 and sunset at 19:00, giving 11 hours 35 minutes of sunlight today.
Taken together, murky spells in Porsgrunn on September 25, 2026 favour slower morning movement before any clearer air arrives.
Frequently asked questions about weather in Porsgrunn
How warm does it get in Porsgrunn?
The warmest month in Porsgrunn is July, with average high temperatures of 21°C. The average temperature during this period is around 17°C.
How cold does it get in Porsgrunn?
The coldest month in Porsgrunn is January, with average low temperatures of -5°C. The average temperature during this period is around -2°C.
What is the wettest time of year in Porsgrunn?
The wettest month in Porsgrunn is September, with an average of 125mm of precipitation.
What is the driest time of year in Porsgrunn?
The driest month in Porsgrunn is April, with an average of 54mm of precipitation.
