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Trondheim, Trøndelag Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Trondheim, Trøndelag?
Trondheim, Trøndelag gets 845 mm of precipitation a year over about 213 rainy days. July is the warmest month (average high 19°C) and January the coldest (average low -4°C).
Humid continental climate
Trondheim, Trøndelag has mild summers and cold winters. Daytime highs range from about 1°C in January to 19°C in July. September is usually the wettest month. The most comfortable time to visit is typically June to August, when daytime highs sit near 18°C.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | -3° | 2° |
| Spring | Mar–May | 2° | 9° |
| Summer | Jun–Aug | 10° | 18° |
| Autumn | Sep–Nov | 3° | 9° |
How much rain does Trondheim get?
Trondheim gets 845 mm of precipitation in an average year, spread over about 213 days with measurable rain. That is more rainy days than 80% of Norway.
September is the wettest month, with 94 mm. May is the driest, with 47 mm. October has the most rainy days, about 19.
The longest dry spell in the last five years lasted 24 days, to February 9, 2026.
From October 2025 to September 2026 Trondheim got 840 mm of rain, against a normal of 845 mm for those months. August 2026 had the most, with 153 mm.
Trondheim weather by month
Trondheim weather in January
In January, Trondheim averages a high of 2°C and a low of -4°C. It gets 75 mm of precipitation over about 18 rainy days. Estimated sunshine is 22% of daylight hours, derived from ERA5 cloud cover. The January record high is 13°C (2020) and the record low is -22°C (2003).
Trondheim weather in February
In February, Trondheim averages a high of 2°C and a low of -3°C. It gets 68 mm of precipitation over about 17 rainy days. Estimated sunshine is 21% of daylight hours, derived from ERA5 cloud cover. The February record high is 13°C (2014) and the record low is -24°C (2010).
Trondheim weather in March
In March, Trondheim averages a high of 4°C and a low of -2°C. It gets 69 mm of precipitation over about 19 rainy days. Estimated sunshine is 28% of daylight hours, derived from ERA5 cloud cover. The March record high is 14°C (2022) and the record low is -18°C (2018).
Trondheim weather in April
In April, Trondheim averages a high of 9°C and a low of 2°C. It gets 49 mm of precipitation over about 16 rainy days. Estimated sunshine is 32% of daylight hours, derived from ERA5 cloud cover. The April record high is 22°C (2019) and the record low is -9°C (2023).
Trondheim weather in May
In May, Trondheim averages a high of 13°C and a low of 5°C. It gets 47 mm of precipitation over about 18 rainy days. Estimated sunshine is 30% of daylight hours, derived from ERA5 cloud cover. The May record high is 28°C (2024) and the record low is -3°C (2003).
Trondheim weather in June
In June, Trondheim averages a high of 17°C and a low of 9°C. It gets 70 mm of precipitation over about 17 rainy days. Estimated sunshine is 31% of daylight hours, derived from ERA5 cloud cover. The June record high is 31°C (2024) and the record low is 1°C (2012). June is one of the most comfortable months to visit.
Trondheim weather in July
In July, Trondheim averages a high of 19°C and a low of 11°C. It gets 70 mm of precipitation over about 19 rainy days. Estimated sunshine is 21% of daylight hours, derived from ERA5 cloud cover. The July record high is 32°C (2025) and the record low is 4°C (2017). July is one of the most comfortable months to visit.
Trondheim weather in August
In August, Trondheim averages a high of 18°C and a low of 11°C. It gets 81 mm of precipitation over about 18 rainy days. Estimated sunshine is 24% of daylight hours, derived from ERA5 cloud cover. The August record high is 29°C (2004) and the record low is 3°C (1999). August is one of the most comfortable months to visit.
Trondheim weather in September
In September, Trondheim averages a high of 14°C and a low of 8°C. It gets 94 mm of precipitation over about 19 rainy days. Estimated sunshine is 24% of daylight hours, derived from ERA5 cloud cover. The September record high is 26°C (1999) and the record low is -2°C (2013).
Trondheim weather in October
In October, Trondheim averages a high of 9°C and a low of 3°C. It gets 74 mm of precipitation over about 19 rainy days. Estimated sunshine is 22% of daylight hours, derived from ERA5 cloud cover. The October record high is 22°C (2018) and the record low is -11°C (2012).
Trondheim weather in November
In November, Trondheim averages a high of 4°C and a low of -1°C. It gets 68 mm of precipitation over about 16 rainy days. Estimated sunshine is 23% of daylight hours, derived from ERA5 cloud cover. The November record high is 16°C (2005) and the record low is -17°C (2010).
Trondheim weather in December
In December, Trondheim averages a high of 2°C and a low of -3°C. It gets 78 mm of precipitation over about 17 rainy days. Estimated sunshine is 23% of daylight hours, derived from ERA5 cloud cover. The December record high is 12°C (2024) and the record low is -19°C (2010).
Sunshine, humidity and wind in Trondheim
April is the sunniest month in Trondheim, with estimated sunshine of 32% of daylight hours from ERA5 cloud cover. February is the cloudiest, at 21%. The annual cloud-cover estimate is 25% of daylight hours; it is not a measurement of sunshine duration. Trondheim is sunnier than 50% of Norway.
Humidity peaks in October at 83% and is lowest in May at 64%.
First and last freeze in Trondheim
The first fall freeze in Trondheim typically comes around October 7, and the last spring freeze around May 4. That leaves a frost-free growing season of about 156 days.
Trondheim weather records
These records cover TRONDHEIM - VOLL during 1997–2026. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Trondheim station is 32°C, on July 17, 2025. The coldest is -24°C, on February 23, 2010.
The wettest day in the available station history brought 68 mm of precipitation, on July 20, 2009.
40 all-time records have been set at the station since 1997.
The best time to visit Trondheim
The most comfortable time to visit is typically June to August, when daytime highs sit near 18°C.
Winter (December–February) is cold, with average highs around 2°C and lows near -3°C.
Spring (March–May) is chilly, with average highs around 9°C and lows near 2°C.
Summer (June–August) is mild, with average highs around 18°C and lows near 10°C. It can feel humid.
Autumn (September–November) is chilly, with average highs around 9°C and lows near 3°C.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | -4° | 2° | 75 mm | 18 | 80% | 22% | 13° | -22° |
| February | -3° | 2° | 68 mm | 17 | 78% | 21% | 13° | -24° |
| March | -2° | 4° | 69 mm | 19 | 71% | 28% | 14° | -18° |
| April | 2° | 9° | 49 mm | 16 | 69% | 32% | 22° | -9° |
| May | 5° | 13° | 47 mm | 18 | 64% | 30% | 28° | -3° |
| June | 9° | 17° | 70 mm | 17 | 67% | 31% | 31° | 1° |
| July | 11° | 19° | 70 mm | 19 | 74% | 21% | 32° | 4° |
| August | 11° | 18° | 81 mm | 18 | 77% | 24% | 29° | 3° |
| September | 8° | 14° | 94 mm | 19 | 79% | 24% | 26° | -2° |
| October | 3° | 9° | 74 mm | 19 | 83% | 22% | 22° | -11° |
| November | -1° | 4° | 68 mm | 16 | 81% | 23% | 16° | -17° |
| December | -3° | 2° | 78 mm | 17 | 81% | 23% | 12° | -19° |
Station: TRONDHEIM - VOLL, 4 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 1997–2026; record values refer to this station and period, not the entire city’s history. Precipitation includes rain and the water equivalent of frozen precipitation; snowfall depth is shown separately when available. Sources and methods
From ERA5 reanalysis. Sunshine is estimated from cloud cover.
Trondheim climate questions
How much rain does Trondheim get?
Trondheim gets 845 mm of precipitation in an average year, over about 213 rainy days.
What is the wettest month in Trondheim?
September is the wettest month in Trondheim, with 94 mm. May is the driest, with 47 mm.
How many rainy days does Trondheim have a year?
Trondheim has about 213 days with measurable rain in an average year. October has the most, about 19.
What is the hottest month in Trondheim?
July is the warmest month in Trondheim, with an average high of 19°C.
What is the coldest month in Trondheim?
January is the coldest month in Trondheim, with an average low of -4°C.
What is the record high temperature in Trondheim?
Within the available 1997–2026 station history, the record high at the Trondheim station is 32°C, set on July 17, 2025. The record low is -24°C, on February 23, 2010.
What is the sunniest month in Trondheim?
April is the sunniest month in Trondheim, with estimated sunshine of 32% of daylight hours from ERA5 cloud cover. February is the cloudiest.
When is the first frost in Trondheim?
The first fall freeze in Trondheim typically comes around October 7. The last spring freeze is around May 4.
What is the best time to visit Trondheim?
The most comfortable time to visit is typically June to August, when daytime highs sit near 18°C.