Trondheim Weather in September

Trondheim in September averages 15°C (59°F) during the day and 7°C (45°F) at night. Keep in mind that quite a bit of rainfall is expected this month.

Rainfall in Trondheim in September

Rain is expected on roughly 23 days, totalling around 127 mm (5 in) for the month. This is a wet month with frequent and often heavy showers. Both the number of rain days and the total rainfall are high.

Temperature in Trondheim in September

Daytime highs in Trondheim in September reach 15°C (59°F), with nights around 7°C (45°F). The difference between afternoon and evening temperatures is usually noticeable. At 7°C (45°F) overnight, it gets properly cold after dark. On the bright side, cold nights tend to make for excellent sleeping conditions.

Sunshine in Trondheim in September

The city usually sees around 132 hours of sunlight, indicating a moderately sunny period.

Wind Speed in Trondheim in September

Wind speeds average 3 m/s (6 knots) during September. At this speed, light breezes keep leaves and small twigs in gentle motion while the wind also provides natural cooling. Since this is an average, some days are more tranquil while others have more persistent light winds that are more noticeable.

Average water temperature in September

At 12°C (54°F), the water is too cold for most people to swim comfortably. A wetsuit is pretty much essential if you plan to go in.

If you prefer dry days with pleasant temperatures, July typically offers the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

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• January
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• October
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For a detailed overview over the year and the best time to visit Norway, check out our Trondheim's climate page.

Trondheim Temperature in September

Min Temperature 7°C (45°F)  

Max Temperature 15°C (59°F)  

Water Temperature 12°C (54°F)  

Chance of Rain 75%  

Precipitation 127 mm (5 in)  

Rainy days 23 days  

Humidity 82%  

Windspeed 3 m/s (6 knots)  

Sunshine 132 hours  

Percentage Sunshine  

What to Wear in Trondheim in September

The weather can be unpredictable in September, so pack clothes you can easily mix and match. You could bring jeans, other long pants, and a few t-shirts. A light jacket or light sweater will be pleasant for the cooler moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. With water temperatures around 12°C (54°F), the water is quite cold for swimming. You can skip the swimwear unless you're particularly tough. Sunglasses could come in handy during the sunnier parts of your trip.

What To Do in Trondheim in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

5/10

Cycling

5/10

Walking

5/10

Camping

3/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Norway, check out our Trondheim's climate page.

More climate data for Trondheim

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Trondheim climate overview or explore weather in Norway.