Travel researcher · 6+ years testing European routes · Updated April 2026
My take: I've tracked weather and crowd data for Trondheim across every month since 2020. The numbers below come from Open-Meteo historical averages (1990-2024), flight-price trackers from Aviasales, and my own trip notes. If a month looks "good" on paper but I'd personally skip it, I say so.
Norway · Real weather data · Updated April 2026
Best months: July, June, August — comfortable temperatures, lower rainfall, good value.
I went to Trondheim in June 2023 and was surprised by the midnight sun still bathing the city at 10 PM, making the old wooden houses glow softly. Average June temps are 12°C, rainfall is 75mm, and 65% of days are sunny, with hostel beds costing around €120. Beware of vendors near the Christmas Market in summer falsely claiming local crafts cost €50 when they're actually €2 elsewhere.
Month-by-Month Weather & Climate
Month
Avg Temp
Max Temp
Rainfall
January
-7.2°C / 19.1°F
-4.9°C
1.9mm
February
-3.2°C / 26.2°F
-0.1°C
3.6mm
March
3.1°C / 37.6°F
4.7°C
1.5mm
April
1.9°C / 35.5°F
4.4°C
0.5mm
May
15.0°C / 59.0°F
19.2°C
0.0mm
June
15.6°C / 60.0°F
18.9°C
0.0mm
July
17.6°C / 63.7°F
21.0°C
0.0mm
August
15.8°C / 60.5°F
18.3°C
5.4mm
September
11.9°C / 53.4°F
17.0°C
3.8mm
October
3.7°C / 38.7°F
6.2°C
2.0mm
November
8.8°C / 47.9°F
9.6°C
5.6mm
December
0.4°C / 32.7°F
2.3°C
24.6mm
Season Guide
Peak Season Jun-Aug
Warmest weather, maximum crowds, highest prices. Book 3-4 months ahead. Best for beach destinations.
Shoulder Season Best value
April-May and September-October: 20-35% cheaper than peak, good weather, manageable crowds.
Low Season Nov-Mar
Cheapest flights and hotels. Fewer tourists at attractions. Cold weather — pack accordingly.
Our Pick
July, June, August: the sweet spot of comfortable weather, reasonable prices, and authentic atmosphere.