Trondheim in Summer
In summer (June, July and August), Trondheim sees average daytime highs around 18°C and overnight lows near 10°C, with 279 mm of rain over about 45 wet days across the season. It is the warmest season of the year and the wettest season of the year.
Across summer, daytime highs hold fairly steady around 18°C. The sky is clear or mostly clear about 11% of the time across summer, and the air most often feels dry.
Summer is Trondheim's best season of the year to visit on our travel score. For the whole year in context, see Trondheim's year-round climate.
- Avg daytime high
- 18°C
- warmest season of the year
- Avg overnight low
- 10°C
- Rainfall
- 279 mm
- 45 wet days
- Avg wind
- 7 km/h
- Travel score
- 4.9
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Trondheim in Summer
Across summer, daytime highs hold fairly steady around 18°C.
A typical summer day in Trondheim reaches about 18°C and drops to 10°C overnight. The warmest of the three months is July, the coolest June.
How summer really feels in Trondheim
Once humidity and wind are folded in, summer brings about 0 days that feel above 32°C and 0 that feel at or below 0°C.
summer sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Trondheim weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 0° / -5° | 96 | 15.9 | 12.7 | 5.2 | 0.0 |
| Feb | 1° / -5° | 84 | 14.2 | 11.9 | 8.1 | 0.0 |
| Mar | 4° / -3° | 88 | 15.4 | 10.8 | 11.2 | 0.1 |
| Apr | 9° / 1° | 67 | 13.6 | 5.4 | 14.5 | 1.6 |
| May | 13° / 5° | 70 | 15.6 | 1.4 | 17.7 | 3.2 |
| Jun | 16° / 8° | 95 | 15.6 | 0 | 19.8 | 4.3 |
| Jul | 19° / 11° | 85 | 14.8 | 0 | 18.9 | 5.3 |
| Aug | 19° / 11° | 99 | 14.9 | 0 | 15.9 | 5.1 |
| Sep | 14° / 7° | 102 | 14.8 | 0 | 12.7 | 3.6 |
| Oct | 8° / 3° | 87 | 15.2 | 2.8 | 9.4 | 1.3 |
| Nov | 3° / -1° | 79 | 13.2 | 7.3 | 6.2 | 0.0 |
| Dec | 1° / -4° | 94 | 15.3 | 10.7 | 4.2 | 0.0 |
Cloud cover in Summer
The sky is clear or mostly clear about 11% of the time across summer.
Chance of precipitation in Summer
Trondheim gets around 279 mm of rain over 45 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 7 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 19 h 06 min in early June to 14 h 18 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 4.2 kWh/m².
Is summer a good time to visit Trondheim?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a reasonable time to visit Trondheim for sightseeing.
What to pack for Trondheim in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Trondheim sees daytime highs around 18°C and nights near 10°C. Pack rain gear. Worth having: a warm layer and sun protection. About 45 days see rain.
Sea temperature near Trondheim in Summer
The nearest coast averages about 12°C across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 55 km away) is warmest in August at about 14°C and coldest in March near 5°C.
The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 6 | 6 | 5 | 6 | 8 | 10 | 13 | 14 | 13 | 11 | 9 | 7 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 6 | Bracing |
| Feb | 6 | Bracing |
| Mar | 5 | Bracing |
| Apr | 6 | Bracing |
| May | 8 | Bracing |
| Jun | 10 | Bracing |
| Jul | 13 | Bracing |
| Aug | 14 | Bracing |
| Sep | 13 | Bracing |
| Oct | 11 | Bracing |
| Nov | 9 | Bracing |
| Dec | 7 | Bracing |
UV index in Trondheim in Summer
Clear-sky midday UV across summer averages around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Trondheim peaks around July 13 at about 4 (moderate) — a little sun protection helps at midday. It bottoms out near January 1 at about 0 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 4 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 0 | 0 | 1 | 2 | 4 | 4 | 5 | 4 | 2 | 1 | 0 | 0 |
| Level | Low | Low | Low | Moderate | Moderate | Moderate | Moderate | Moderate | Low | Low | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 0 | Low |
| Feb | 0 | Low |
| Mar | 1 | Low |
| Apr | 2 | Moderate |
| May | 4 | Moderate |
| Jun | 4 | Moderate |
| Jul | 5 | Moderate |
| Aug | 4 | Moderate |
| Sep | 2 | Low |
| Oct | 1 | Low |
| Nov | 0 | Low |
| Dec | 0 | Low |
Where is Trondheim?
Trondheim sits at 63.4°N, 10.4°E, 18 m above sea level, in Norway. The nearest listed city is Stjørdalshalsen, 27 km away.
Topography around Trondheim
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Trondheim.
Within 3 km, the terrain around Trondheim has significant variations in elevation — a maximum elevation change of 312 m around an average of 52 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 558 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,431 m.
The land around Trondheim is covered by trees (33%), artificial surfaces (31%) and water (31%) within 3 km, water (48%) and trees (34%) within 16 km, and grassland (37%), trees (36%) and water (22%) within 80 km.
Norway travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type C / F
- 230 V · 50 Hz
- Prices
- ≈ 91% of US
- price level, 2025
- GDP per capita
- $94,594
- 2025
- Happiness
- 7.2 / 10
- World Happiness, 2025
- Safe drinking water
- 99%
- of population, 2024
- Homicide rate
- 0.7
- per 100k, 2023
- Road deaths
- 2.1
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Very high
- EF EPI 613
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Trondheim (63.4305°, 10.3951°, elevation 18 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.