TrondheimPhoto: David Stanley from Nanaimo, Canada · CC BY 4.0Norway · Europe
Best time to visit Trondheim
Trondheim was Norway's first capital: the mighty Nidaros Cathedral, colourful riverside warehouses and lively student life. Cool all year, friendliest in summer.
Climate decision
Best travel months for Trondheim
Top recommendation
Next highest scores
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Latest 5-year values 2021–2025
Average of the five most recent complete years compared with the 1991–2025 climate average.
October · Wet days
24.2 days/month
1991–2025: 19.5 days/month
+4.7 days/month · higher
June · Mean daily maximum
16.5 °C
1991–2025: 14.8 °C
+1.7 °C · higher
October · Monthly precipitation
182.7 mm/month
1991–2025: 136.1 mm/month
+46.6 mm/month · higher
August · Sea temperature
14.3 °C
1991–2025: 13.7 °C
+0.7 °C · higher
July: 1/155 days at or above 30 °C; highest single value 31 °C.
Five-year historical sample, not a weather forecast or long-term climate trend. Individual hot days can be far above the monthly mean.
Annual profile · Coast and sea
Trondheim: the swimming season follows two curves
Average daily highs vary by 19.1 °C through the year, while the sea varies by 8.2 °C. Air and water temperature should therefore be considered separately.
The practical difference
The month with the highest daytime temperature and the month with the warmest sea need not define the same travel window. Rain and sunshine help resolve the trade-off.
Warmest sea
August · 13.7 °C
Highest average daily high
July · 17.5 °C
Fewest rainy days
April · 16.2
Most sunshine
June · 6.1 h
Month by month
Overall suitability per month. Tap a month for details.
All climate figures compared
The table is the complete accessible data view; the charts below highlight selected patterns.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Rain mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| January | -2 | -6 | 20 | 138 | 0.2 | 96 | 1.8 | 6 | 9 |
| February | -1 | -6 | 18 | 120 | 0.8 | 95 | 1.8 | 6 | 12 |
| March | 1 | -4 | 19 | 124 | 2.3 | 93 | 1.6 | 5 | 13 |
| April | 6 | -1 | 16 | 93 | 4.5 | 86 | 1.2 | 6 | 21 |
| May | 11 | 3 | 18 | 96 | 5.7 | 80 | 0.8 | 8 | 26 |
| June | 15 | 7 | 20 | 141 | 6.1 | 81 | 0.6 | 11 | 32 |
| July | 18 | 10 | 20 | 135 | 5.7 | 83 | 0.5 | 13 | 39 |
| August | 16 | 10 | 20 | 149 | 4.4 | 86 | 0.6 | 14 | 34 |
| September | 13 | 7 | 18 | 136 | 2.7 | 88 | 0.7 | 13 | 25 |
| October | 7 | 2 | 20 | 136 | 1.2 | 92 | 0.8 | 11 | 13 |
| November | 1 | -2 | 17 | 116 | 0.3 | 95 | 1.1 | 9 | 12 |
| December | -1 | -5 | 20 | 135 | 0.1 | 96 | 1.5 | 7 | 9 |
Climate through the year
Compare temperature, rainy days, sunshine and, for coastal destinations, sea temperature month by month.
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Where to stay in Trondheim
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The number is the overall climate score, not a similarity score.
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Frequently asked questions
When is the best time to visit Trondheim?
The best time depends on the trip type; the cards above show each monthly decision.
Which month has the highest average daily maximum temperature in Trondheim?
The average daily maximum temperature in Trondheim is highest in July at around 18 °C.
When is the sea warmest at Trondheim?
In August, at around 14 °C.