Norway
Trondheim in August: weather, sea & travel advice
This month's data profile
Rain shapes the decision
Trondheim in August is climatically mixed. The average daily high is around 16 °C, and the sea is about 14 °C. With about 20 rainy days it is very wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
34/100 · #2
Warmth
#2
Dryness
#12
Sun
#5
Sea warmth
#1
Published best categories: none
Trondheim · AugustPhoto: David Stanley from Nanaimo, Canada · CC BY 4.0Climate facts
- Average high
- 16 °C
- Average low
- 10 °C
- Sea
- 14 °C
- Rainy days (est.)
- 20 rainy days (est.)
- Sun (est.)
- 4 h/day
- Humidity
- 86 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| July | 18 | 10 | 20 | 135 | 5.7 | 83 | 0.5 | 13 | 39 |
| August (selected) | 16 | 10 | 20 | 149 | 4.4 | 86 | 0.6 | 14 | 34 |
| September | 13 | 7 | 18 | 136 | 2.7 | 88 | 0.7 | 13 | 25 |
How do the previous and next months compare?
Baseline: August (34/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | Sea Δ | |
|---|---|---|---|---|---|---|---|---|---|
| July | +5 | +1.1 °C | +0.4 °C | -0.3 | -14.2 mm | +1.3 h | -3.1 % | -0.1 m/s | -0.8 °C |
| September | -9 | -3.7 °C | -3 °C | -2.7 | -13.1 mm | -1.7 h | +2.1 % | +0.1 m/s | -1 °C |
All twelve months in context
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Where to stay in Trondheim
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Useful next decisions
Frequently asked questions
How warm is Trondheim in August?
The average daily high is around 16 °C, with an average daily low of about 10 °C.
Can you swim in Trondheim in August?
The sea is about 14 °C (cold).
Does it rain a lot in Trondheim in August?
The curated estimate is about 20 rainy days per month, not a directly measured long-term average. Total precipitation averages around 149 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Trondheim?
No month in Trondheim reaches the threshold for a clear recommendation in the climate score; the month comparison above shows the differences.