Trondheim, Trøndelag Weather by Month and Climate Averages

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.

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. The sun is out about 22% of daylight hours. 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. The sun is out about 21% of daylight hours. 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. The sun is out about 28% of daylight hours. 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. The sun is out about 32% of daylight hours. 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. The sun is out about 30% of daylight hours. 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. The sun is out about 31% of daylight hours. 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. The sun is out about 21% of daylight hours. 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. The sun is out about 24% of daylight hours. 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. The sun is out about 24% of daylight hours. 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. The sun is out about 22% of daylight hours. 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. The sun is out about 23% of daylight hours. 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. The sun is out about 23% of daylight hours. 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 sunshine about 32% of daylight hours. February is the cloudiest, at 21%. Over the year the sun shines about 25% of daylight hours. 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

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 on record brought 68 mm of rain, 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.

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?

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 sunshine about 32% of daylight hours. 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.