Climate averages 1991–2020
Trondheim weather
in August.
A mild, wet month: the 2nd warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a mild month in Trondheim: daytime highs average 17.9°C and nights cool to about 10.6°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 99 mm of rain on roughly 15 days, which makes August a wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 16 h 17 min on an average August day.
The nearest other city in this atlas is Lillestrøm (388 km away). In August its highs average 19.6°C, 1.7°C warmer than Trondheim, with 104 mm of rain.
Among the 8 cities listed in Norway, Trondheim ranks 6th of 8 for the warmest August highs and 2nd of 8 for the driest August (rainfall, lowest first). The mean August high of those 8 cities is 18.8°C; Trondheim is 0.9°C cooler than that mean.
From August to September, average highs fall by 3.9°C to 14.0°C, and monthly rainfall rises from 99 mm to 102 mm.
The annual picture
August in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Trondheim climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -1.1°C-6.1°C | -6.1°C | 96 | 16.0 | 5.86 h |
| February | -0.5°C-6.1°C | -6.1°C | 86 | 14.5 | 8.69 h |
| March | 2.9°C-3.8°C | -3.8°C | 88 | 15.4 | 11.712 h |
| April | 7.8°C-0.4°C | -0.4°C | 67 | 13.6 | 14.915 h |
| May | 12.5°C3.8°C | 3.8°C | 70 | 15.6 | 18.118 h |
| June | 15.9°C8.1°C | 8.1°C | 95 | 15.6 | 20.320 h |
| July | 18.6°C10.8°C | 10.8°C | 85 | 14.8 | 19.319 h |
| August, selected | 17.9°C10.6°C | 10.6°C | 99 | 14.9 | 16.316 h |
| September | 14.0°C7.3°C | 7.3°C | 102 | 14.8 | 13.113 h |
| October | 7.8°C2.2°C | 2.2°C | 87 | 15.2 | 9.910 h |
| November | 2.3°C-2.4°C | -2.4°C | 79 | 13.2 | 6.87 h |
| December | -0.6°C-5.7°C | -5.7°C | 94 | 15.3 | 4.85 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Lillestrøm in AugustNorway · 388 kmHigh 19.6°C · Low 12.3°C · 104 mm rain
- Oslo in AugustNorway · 392 kmHigh 20.2°C · Low 13.2°C · 112 mm rain
- Drammen in AugustNorway · 410 kmHigh 20.3°C · Low 13.3°C · 104 mm rain
- Bergen in AugustNorway · 429 kmHigh 17.1°C · Low 11.4°C · 188 mm rain
- Gävle in AugustSweden · 466 kmHigh 20.3°C · Low 13.1°C · 72 mm rain
- Fredrikstad in AugustNorway · 469 kmHigh 19.7°C · Low 14.1°C · 86 mm rain
- Umeå in AugustSweden · 489 kmHigh 17.7°C · Low 12.5°C · 75 mm rain
- Örebro in AugustSweden · 528 kmHigh 20.3°C · Low 13.3°C · 74 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Trondheim) is explained once on the Trondheim year overview and on the Sources, method and limits page.