Climate averages 1991–2020
Trondheim weather
in May.
A cool, moderately wet month: the 5th warmest and the 2nd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a cool month in Trondheim: daytime highs average 12.5°C and nights cool to about 3.8°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 70 mm of rain on roughly 16 days, which makes May a moderately wet month (the 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 18 h 07 min on an average May day.
The nearest other city in this atlas is Lillestrøm (388 km away). In May its highs average 15.1°C, 2.6°C warmer than Trondheim, with 74 mm of rain.
Among the 8 cities listed in Norway, Trondheim ranks 6th of 8 for the warmest May highs and 2nd of 8 for the driest May (rainfall, lowest first). The mean May high of those 8 cities is 13.9°C; Trondheim is 1.4°C cooler than that mean.
From May to June, average highs rise by 3.3°C to 15.9°C, and monthly rainfall rises from 70 mm to 95 mm.
The annual picture
May 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, selected | 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 | 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
May in nearby cities
- Lillestrøm in MayNorway · 388 kmHigh 15.1°C · Low 5.8°C · 74 mm rain
- Oslo in MayNorway · 392 kmHigh 15.7°C · Low 6.4°C · 77 mm rain
- Drammen in MayNorway · 410 kmHigh 15.7°C · Low 6.3°C · 76 mm rain
- Bergen in MayNorway · 429 kmHigh 12.2°C · Low 5.6°C · 116 mm rain
- Gävle in MaySweden · 466 kmHigh 14.9°C · Low 5.9°C · 44 mm rain
- Fredrikstad in MayNorway · 469 kmHigh 14.7°C · Low 7.6°C · 61 mm rain
- Umeå in MaySweden · 489 kmHigh 10.5°C · Low 4.2°C · 42 mm rain
- Örebro in MaySweden · 528 kmHigh 15.7°C · Low 6.8°C · 53 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.