Trondheim, Norway experiences average highs of 9°C (48°F) and lows of 2°C (36°F) throughout the year. Rainfall is frequent, averaging about 16 rainy days per month. Average highs have warmed by 1.3°C (2.3°F) across the available records.
Trondheim, Norway Weather & Climate 2026
Monthly climate averages for Trondheim, Norway. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Feb–Dec 
Wetter season: Jan–Oct At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
3.3/10
Best: June, July, August, September
UV Index
2
Low
Temperature 9°C / 2°C
Feels Like 6°C / -1°C
Rainy Days 16
Rainfall 98 mm
Sunshine 7 h
Humidity 82%
Wind Speed 13 km/h
Dew Point 3°C
Snow Days 11 days
Frost Days 19 days
Hottest Month
19°C
July
Avg Low11°C
Rain16days
Coldest Month
-6°C
January
Avg High-1°C
Rain17days
Driest Month
13days
November
Avg High3°C
Avg Low-2°C
Windiest Month
15 km/h
January (Gusts 39)
Sea Temperature
4°C – 17°C
Warmest water: July (
16.6°C
)
Worst Time to Visit
Consider avoiding January, March, November, December due to very cold temperatures, heavy rainfall.
Sun Position
Sunrise 03:05
Daylight 20.5h
Sunset 23:35
Live conditions—
Trondheim on the map · live conditions
Trondheim, Norway
- Continent
- Europe
- Country
- Norway
- City
- Trondheim
- Population
- 216.5K
- Coordinates
- 63.43°, 10.40°
Seasonal Breakdown
Spring
Mar–May
Avg High 8°C
Avg Low 0°C
Rain 15 days/mo
Summer
Jun–Aug
Avg High 18°C
Avg Low 10°C
Rain 16 days/mo
3/3 best months
Autumn
Sep–Nov
Avg High 9°C
Avg Low 3°C
Rain 16 days/mo
1/3 best months
Winter
Dec–Feb
Avg High -1°C
Avg Low -6°C
Rain 15 days/mo
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: -1°C / -6°C . Feb: 0°C / -6°C . Mar: 3°C / -3°C . Apr: 8°C / 0°C . May: 14°C / 5°C . Jun: 18°C / 9°C . Jul: 19°C / 11°C . Aug: 18°C / 11°C . Sep: 15°C / 8°C . Oct: 9°C / 3°C . Nov: 3°C / -2°C . Dec: 0°C / -5°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 105 mm. Feb: 77 mm. Mar: 104 mm. Apr: 80 mm. May: 73 mm. Jun: 88 mm. Jul: 94 mm. Aug: 119 mm. Sep: 111 mm. Oct: 121 mm. Nov: 85 mm. Dec: 113 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 84%. Feb: 83%. Mar: 81%. Apr: 79%. May: 75%. Jun: 76%. Jul: 79%. Aug: 82%. Sep: 83%. Oct: 88%. Nov: 88%. Dec: 87%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 15 km/h . Feb: 14 km/h . Mar: 15 km/h . Apr: 13 km/h . May: 13 km/h . Jun: 13 km/h . Jul: 12 km/h . Aug: 12 km/h . Sep: 13 km/h . Oct: 13 km/h . Nov: 12 km/h . Dec: 14 km/h .
Sunshine
Sunshine
Sunshine: Jan: 1h. Feb: 4h. Mar: 7h. Apr: 10h. May: 12h. Jun: 11h. Jul: 11h. Aug: 10h. Sep: 7h. Oct: 4h. Nov: 2h. Dec: 1h.
Sea Temperature
Sea Temperatureswim
Line chart showing monthly sea temperature. Jan: 4°C . Feb: 4°C . Mar: 4°C . Apr: 6°C . May: 10°C . Jun: 13°C . Jul: 17°C . Aug: 16°C . Sep: 14°C . Oct: 10°C . Nov: 7°C . Dec: 5°C .
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 0. Feb: UV 1. Mar: UV 2. Apr: UV 3. May: UV 4. Jun: UV 5. Jul: UV 5. Aug: UV 4. Sep: UV 2. Oct: UV 1. Nov: UV 0. Dec: UV 0.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Snow Days
Snow DaysSnowfall
Snow Days: Jan: 18 days. Feb: 15 days. Mar: 15 days. Apr: 10 days. May: 3 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 2 days. Nov: 9 days. Dec: 15 days.
Climate Trends
Average highs have warmed by 1.3°C (2.3°F) across the available records. Average rainfall is trending wetter by about 24 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jul 2025 · 23°C | Jul · 19°C |
| Coldest month | Jan 2025 · -5°C | Jan · -6°C |
| Wettest month | Mar 2025 · 248 mm | Oct · 121 mm |
| Windiest month | Mar 2025 · 16 km/h | Jan · 15 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Poor April
Poor May
Fair June best
Good July best
Good August best
Fair September best
Fair October
Wet November
Poor December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | -1°C / -6°C | -5°C / -11°C | 17days (105 mm) Wet | 1.4h Poor | 84% Humid | 0.3 Low | Poor | View Details |
| February | 0°C / -6°C | -4°C / -10°C | 14days (77 mm) Wet | 3.9h Poor | 83% Humid | 0.9 Low | Poor | View Details |
| March | 3°C / -3°C | 0°C / -7°C | 15days (104 mm) Wet | 6.6h Fair | 81% Humid | 1.8 Low | Poor | View Details |
| April | 8°C / 0°C | 5°C / -4°C | 15days (80 mm) Wet | 9.9h Good | 79% Humid | 3.2 Moderate | Poor | View Details |
| May | 14°C / 5°C | 12°C / 2°C | 15days (73 mm) Wet | 11.8h Excellent | 75% Muggy | 4.2 Moderate | Fair | View Details |
| June best | 18°C / 9°C | 17°C / 8°C | 15days (88 mm) Wet | 11.4h Excellent | 76% Humid | 4.7 Moderate | Good | View Details |
| July best | 19°C / 11°C | 19°C / 11°C | 16days (94 mm) Wet | 11.1h Excellent | 79% Humid | 4.5 Moderate | Good | View Details |
| August best | 18°C / 11°C | 17°C / 10°C | 17days (119 mm) Wet | 9.5h Good | 82% Humid | 3.7 Moderate | Fair | View Details |
| September best | 15°C / 8°C | 14°C / 6°C | 16days (111 mm) Wet | 7.2h Good | 83% Humid | 2.4 Moderate | Fair | View Details |
| October | 9°C / 3°C | 6°C / 0°C | 18days (121 mm) Wet | 4.4h Fair | 88% Very Muggy | 1 Low | Wet | View Details |
| November | 3°C / -2°C | -1°C / -6°C | 13days (85 mm) Wet | 2h Poor | 88% Very Muggy | 0.4 Low | Poor | View Details |
| December | 0°C / -5°C | -4°C / -9°C | 15days (113 mm) Wet | 0.9h Poor | 87% Very Muggy | 0.1 Low | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Trondheim are June, July, August, September, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Trondheim, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Trondheim is July, with average daytime highs of 19°C (67°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Trondheim is January, with average overnight lows of -6°C (20°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Trondheim is October, averaging 121mm of precipitation across 18 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Trondheim runs through October, January, August, July, with the heaviest rainfall in October. Based on 10-year averages for Trondheim.
Trondheim receives approximately 80 sunshine hours per year. The sunniest month is May with around 12 hours. Based on climate data for Trondheim.
The least favorable months to visit Trondheim are January, March, November, December, primarily due to very cold temperatures, heavy rainfall. For the best conditions, consider June, July, August, September instead.
The annual average UV index in Trondheim is 2, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Trondheim is 82%, classified as humid. High humidity makes warm temperatures feel significantly hotter — lightweight, breathable clothing is recommended.
Sea temperatures in Summer average 9°C (48°F), which most swimmers will find too cold without a wetsuit.
Yes, Trondheim receives snow. Months with snowfall average 11 snow days and 22 cm (9 in) of accumulation, with about 19 frost days during winter.
Average wind speeds in Trondheim are 13 km/h (8 mph). The windiest month is January with peak winds reaching 15 km/h (9 mph) (gusts up to 39 km/h / 24 mph).
Trondheim averages 2 clear-sky days per month with overall cloud cover around 74%. The clearest skies occur in April.
The annual average dew point in Trondheim is 3°C (37°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Trondheim has a Warm-Summer Continental climate, classified as Dfb under the Köppen system. Continental climates experience extreme temperature ranges — hot summers and cold, snowy winters.
The 'feels like' temperature in Trondheim ranges from -1°C (30°F) to 6°C (43°F) on average. Wind chill makes winters feel noticeably colder than the actual temperature — layered clothing is recommended.
Yes, June is a great time to visit Trondheim. It earns a climate score of 6.6/10 with Good.
For June in Trondheim, pack Layered clothing, Light jacket, Umbrella, Waterproof jacket, Waterproof shoes. With average highs of 18°C (64°F) and 15 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
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