Weather in Trondheim in August 2025
Average weather
Average temperature in Trondheim in August
The temperature in August is +19°C on average, with a range between a maximum of +24°C during the day and a minimum of +9°C at night.
The average maximum temperature goes down 27% by the end of the month, compared with the beginning of the month, from +20°C to +16°C.
Is Trondheim warm or cold in August?
Trondheim is typically mild in August.
Maximum temperatures go down compared to the previous month from +19°C to +18°C. The minimum temperature also goes down from +11°C to +10°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
August is one of the warmest months in Trondheim, here is the comparison with other months:
Water temperature in Trondheim in August
Water in Trondheim in August is Cold. It varies from +12°C to +17°C, with an average of +15°C. This is almost similar to the air temperature, which averages +18°C.
The water temperature in August is one of the warmest of the entire year:
Can you swim in Trondheim in August?
Climate in Trondheim in August
| July | August | September | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +19°C | +18°C | +14°C | ||||
| Min. temperature | ||||||
| +4°C | +2°C | -2°C | ||||
| Max. temperature | ||||||
| +32°C | +30°C | +25°C | ||||
| Rainfall | ||||||
| 118 mm | 124 mm | 121 mm | ||||
| Wind | ||||||
| 1 m/s | 1 m/s | 1 m/s | ||||
| Avg. water temperature | ||||||
| +14°C | +15°C | +13°C | ||||
| Humidity | ||||||
| 76% | 78% | 79% | ||||
| Air pressure | ||||||
| 1011 HPa | 1010 HPa | 1010 HPa | ||||
| Sunny days | ||||||
| 1 | 1 | 2 | ||||
| Cloudy days | ||||||
| 7 | 7 | 7 | ||||
| Rainy days | ||||||
| 23 | 23 | 21 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
August weather is still as ok as in July. It’s getting colder in August. From +19°C in the day, the average maximum temperature lowers to +18°C. Prepare for more rain. Average rainfall goes from 118 mm to 124 mm. Humidity rises from 76% to 78%. The average wind speed doesn’t change much during August, staying around 1 m/s. The amount of sunny days stay about the same, averaging 1 sunny days during the month.
September brings much the same weather, it remains ok.
Wind
The average wind speed is 1 m/s getting up to 2 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Trondheim is gradually increasing during August, going from 0 m/s to 1 m/s over the course of the month.
Rain
How was the weather last August in Trondheim?
Climate Change over Years
The climate in Trondheim in August has not changed much over the last 43 years.
The average temperature was the lowest in 1981 (+7°C) and the highest in 2014 (+11°C). The driest year was 2002 with only 617 mm of rainfall, and the wettest year was 2007 with 1311 mm.
FAQ
Is August a good time to visit Trondheim?
Can you sunbathe in Trondheim in August?
Can you swim in Trondheim in August?
Is Trondheim rainy in August?
Is it sunny in Trondheim in August?
Other cities in Norway
Monthly weather in Trondheim
Source of the data
For this page, we’ve looked at the typical weather in Trondheim, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.