September weather forecast
Fredrikstad, Norway

The fall season announces its presence in September, registering a definitive dip in temperatures. The sea,however, maintains its warmth at 15.8 degrees for late-season swimmers. Daylight begins to noticeably shorten, giving way to longer evenings. Overall, this month marks the onset of autumn, transition to cooler temperatures and reduction in hours of sunshine. Despite the changes, the city maintains an attractive weather for outdoor activities.

Temperature

In Fredrikstad, the average high-temperature in September drops from a pleasant 20°C (68°F) in August to a refreshing 15°C (59°F). During September, the nighttime temperature averages to a chilly 8°C (46.4°F).

Rainfall

In Fredrikstad, Norway, in September, it is raining for 16 days, with typically 90mm (3.54") of accumulated precipitation. Throughout the year, there are 179 rainfall days, and 808mm (31.81") of precipitation is accumulated.

Sea temperature

In Fredrikstad, in September, the average water temperature is 15.8°C (60.4°F).
Note: Swimming in water at 15.8°C (60.4°F) is not a pleasing experience for the majority. As the temperature descends from 21°C (69.8°F) to 15°C (59°F), controlling breathing becomes increasingly hard.

Daylight

In Fredrikstad, Norway, the average length of the day in September is 12h and 50min.
On the first day of September, sunrise is at 06:14 and sunset at 20:17. On the last day of the month, sunrise is at 07:20 and sunset at 18:51 CEST.

Sunshine

In Fredrikstad, Norway, the average sunshine in September is 5h.

UV index

In September, the average daily maximum UV index in Fredrikstad, Norway, is 3. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the average person.
Note: In September, the maximum UV index of 3 suggests this advice:
Undertake protective steps - Preventing sun damage is advised. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.