Trondheim climate

Name: Trondheim
Address: NO

Trondheim is warmest in July, with average highs of 19 °C, and coldest in February, when nights average -5.9 °C. September is the wettest month (106 mm) and April the driest (67 mm). Figures are 1991–2020 climate normals.

Across a full year Trondheim averages 1,065 mm of rain, 7 days above 25 °C and 151 days below freezing.

Norway · population 216,518 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month July 19 °C
Coldest month February -5.9 °C
Driest month April 67 mm
Wettest month September 106 mm
Least cloud May 69 % cloud
Hottest on record July 31 °C
Coldest on record January -29 °C

What to expectTrondheim through the year

Trondheim has a clear annual cycle: average daily highs run from -0.2 °C in February to 19 °C in July, a swing of 18 °C in mean temperature across the year.

Counted across a normal year, 7 days a year reach 25 °C, 0 of them reach 30 °C, 151 nights drop below freezing. The warmest reading in the 1991–2020 record is 31 °C, in July.

Rain is spread fairly evenly through the year, from 67 mm in April to 106 mm in September. There is no dry season to aim for.

Month by month

Month	Avg high	Rainfall	Cloud
January	-0.8 °C	97 mm	76 %
February	-0.2 °C	86 mm	74 %
March	3.1 °C	88 mm	73 %
April	7.9 °C	67 mm	70 %
May	12.5 °C	71 mm	69 %
June	15.8 °C	96 mm	75 %
July	18.5 °C	87 mm	73 %
August	17.8 °C	100 mm	73 %
September	14.0 °C	106 mm	71 %
October	7.9 °C	91 mm	72 %
November	2.4 °C	81 mm	73 %
December	-0.4 °C	95 mm	77 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days below 0 °C
January	-0.8 °C	-5.9 °C	-3.1 °C	12.1 °C	-29.4 °C	0	26
February	-0.2 °C	-5.9 °C	-2.9 °C	9.6 °C	-25.9 °C	0	25
March	3.1 °C	-3.7 °C	-0.2 °C	14.1 °C	-24.6 °C	0	25
April	7.9 °C	-0.3 °C	3.9 °C	21.5 °C	-10.6 °C	0	16
May	12.5 °C	3.8 °C	8.5 °C	26.0 °C	-3.4 °C	0	3
June	15.8 °C	8.0 °C	12.2 °C	30.0 °C	0.5 °C	1	0
July	18.5 °C	10.8 °C	14.8 °C	31.3 °C	3.6 °C	3	0
August	17.8 °C	10.5 °C	14.3 °C	29.2 °C	3.4 °C	2	0
September	14.0 °C	7.2 °C	10.6 °C	25.2 °C	-1.3 °C	0	0
October	7.9 °C	2.2 °C	5.1 °C	19.8 °C	-11.7 °C	0	8
November	2.4 °C	-2.2 °C	0.2 °C	12.7 °C	-23.7 °C	0	22
December	-0.4 °C	-5.4 °C	-2.8 °C	8.4 °C	-24.7 °C	0	26

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	97 mm	16	5.7 h/day	76 %	80 %	15 km/h
February	86 mm	14	8.6 h/day	74 %	80 %	15 km/h
March	88 mm	15	12 h/day	73 %	79 %	15 km/h
April	67 mm	13	15 h/day	70 %	78 %	14 km/h
May	71 mm	15	18 h/day	69 %	75 %	14 km/h
June	96 mm	16	21 h/day	75 %	77 %	13 km/h
July	87 mm	14	19 h/day	73 %	79 %	12 km/h
August	100 mm	15	16 h/day	73 %	80 %	12 km/h
September	106 mm	15	13 h/day	71 %	83 %	14 km/h
October	91 mm	15	9.9 h/day	72 %	86 %	14 km/h
November	81 mm	13	6.7 h/day	73 %	86 %	14 km/h
December	95 mm	15	4.6 h/day	77 %	84 %	14 km/h

Where Trondheim ranks

Ranking	Position	Value
The coolest places in Europe in June	14th of 50	16 °C
The coolest places in Europe in July	18th of 50	19 °C
The coolest places in Europe in August	20th of 50	18 °C
The coolest places in Europe in May	21st of 50	12 °C
The coolest places in Europe in September	27th of 50	14 °C
The coolest places in the world in May	30th of 50	12 °C

Planning a trip? See the best time to visit Trondheim.

QuestionsCommon questions about Trondheim’s climate

When is the best time to visit Trondheim?

That depends on what you want, so the honest answer is a comparison rather than a single month. June, July, August sit closest to 20 °C on average, July is the warmest month and April the driest. The month-by-month table above has the full picture.

How hot does Trondheim get?

In July, the warmest month, daily highs average 19 °C. About 0 days a year pass 30 °C. The highest value in the 1991–2020 record is 31 °C.

How cold does it get in winter?

Nights average -5.9 °C in February, the coldest month. A normal year has 151 nights below freezing.

Which month is wettest in Trondheim?

September, averaging 106 mm over 15 days with rain. The driest month is April with 67 mm. The year as a whole averages 1,065 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Trondheim rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Data point: 63.430°, 10.395° (the coordinates the reanalysis values are taken for)
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.