Cool
Average highs are around 17°C, so pack for cooler days.
Weather Guide
Trondheim, Norway Average Monthly Weather
Weather score19Poor annual avg
Best months: June, July, May
Across the year, average daytime temperatures are around 8°C, sunshine averages 3.4h per day, and rainfall totals about 1097mm. Sea temperatures average 9°C across the year.
Annual weather
Annual averages
Temp
8°C
Rain
1097mm
Annual total
Sun
3.4h
Sea
9°C
Weather score
19
Poor avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 77mm, which is relatively low for holiday planning.
Some sun
Sunshine averages 5.3h per day, enough for a balanced month.
Cool sea
Sea temperatures average 14°C, so the water can feel cool.
Map
Weather map
Compare Trondheim, Norway with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
August17°C average high
August is one of Trondheim's hottest months, so shade and slower afternoons matter.
Warmest monthsJune to August
This stretch sets the upper range for average daytime heat.
Rain
August77mm average rain
August sits on the drier side of Trondheim's year, which helps with sightseeing and transfers.
Driest monthsFebruary to August
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
August5.3 hours average sun
August is brighter than Trondheim's yearly average, though the strongest sunshine usually sits closer to the peak months.
Brightest monthsMay to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
August14°C average sea
August is one of Trondheim's warmest sea months, when swimming comfort is usually strongest.
Warmest seaJuly to September
Sea temperatures are usually near 13°C in this stretch, so swimming comfort is at its strongest.
Weather score
August28 weather score
August scores above Trondheim's yearly average, so the overall weather mix is stronger than most months.
Best weather monthsMay to August
These months have the strongest weather score in the monthly averages.