September weather forecast
Trondheim, Norway

September sees a noticeable drop in temperatures, slipping from 6°C to 12°C, as Trondheim starts to welcome autumn. Even the longest day in September is shorter than the shortest day in August, signifying the approach of shorter daylight hours. The declining temperatures and daylight hours are accompanied by the highest rainfall in the year, totalling 133mm. Yet, despite the less inviting environment, the city dons a beautiful autumnal cloak, attracting a fair share of nature enthusiasts. The month ends with a noticeable chill in the air, hinting at the upcoming winter cold.

Temperature

The average high-temperature in Trondheim drops in September, from August's enjoyable 17°C to a fresh 12°C. Trondheim, during September, witnesses an average low-temperature of 6°C.

Rainfall

September is the month with the most rainfall. Rain falls for 24 days and accumulates 133mm of precipitation.

Sea temperature

In Trondheim, Norway, in September, the average water temperature is 13.4°C.
Note: It is risky to swim in 13.4°C. Temperatures beneath 10°C induce rapid cold shock and hyperventilation.

Daylight

The average length of the day in September in Trondheim, Norway, is 12h and 59min.
On the first day of the month, sunrise is at 06:02 and sunset at 20:34. On the last day of September, sunrise is at 07:23 and sunset at 18:53 CEST.

Sunshine

In September, the average sunshine in Trondheim, Norway, is 3h.

UV index

In Trondheim, the average daily maximum UV index in September is 2. A UV Index reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: The maximum daily UV index of 2 in September converts into the following recommendations:
Most individuals face no major issues with lengthy exposure to the sun, but children, infants, and individuals with fair skin always require protection. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.