Climate averages 1991–2020
Oulu weather
in May.
A cool, moderately wet month: the 5th warmest and the joint 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a cool month in Oulu: daytime highs average 10.9°C and nights cool to about 3.8°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 48 mm of rain on roughly 10 days, which makes May a moderately wet month (the joint 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 18 h 44 min on an average May day.
The nearest other city in this atlas is Luleå (167 km away). In May its highs average 9.0°C, 1.8°C cooler than Oulu, with 38 mm of rain.
Among the 13 cities listed in Finland, Oulu ranks 13th of 13 for the warmest May highs and joint 9th of 13 for the driest May (rainfall, lowest first). The mean May high of those 13 cities is 13.2°C; Oulu is 2.4°C cooler than that mean.
From May to June, average highs rise by 5.2°C to 16.0°C, and monthly rainfall rises from 48 mm to 56 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
Oulu climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -5.5°C-10.2°C | -10.2°C | 35 | 8.8 | 5.15 h |
| February | -6.0°C-10.6°C | -10.6°C | 29 | 8.0 | 8.38 h |
| March | -1.9°C-7.1°C | -7.1°C | 30 | 7.7 | 11.712 h |
| April | 4.0°C-2.6°C | -2.6°C | 30 | 7.4 | 15.215 h |
| May, selected | 10.9°C3.8°C | 3.8°C | 48 | 10.0 | 18.719 h |
| June | 16.0°C9.6°C | 9.6°C | 56 | 10.0 | 21.622 h |
| July | 19.5°C13.4°C | 13.4°C | 78 | 12.1 | 20.220 h |
| August | 17.6°C12.0°C | 12.0°C | 71 | 12.0 | 16.617 h |
| September | 12.2°C7.5°C | 7.5°C | 56 | 10.4 | 13.213 h |
| October | 5.0°C1.5°C | 1.5°C | 50 | 10.3 | 9.810 h |
| November | 0.3°C-3.1°C | -3.1°C | 48 | 10.6 | 6.36 h |
| December | -2.9°C-7.2°C | -7.2°C | 44 | 10.8 | 3.94 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
- Luleå in MaySweden · 167 kmHigh 9.0°C · Low 3.1°C · 38 mm rain
- Kuopio in MayFinland · 259 kmHigh 12.1°C · Low 4.4°C · 53 mm rain
- Umeå in MaySweden · 282 kmHigh 10.5°C · Low 4.2°C · 42 mm rain
- Jyväskylä in MayFinland · 308 kmHigh 13.5°C · Low 5.1°C · 48 mm rain
- Joensuu in MayFinland · 341 kmHigh 11.2°C · Low 4.4°C · 49 mm rain
- Tampere in MayFinland · 400 kmHigh 13.2°C · Low 5.2°C · 45 mm rain
- Pori in MayFinland · 434 kmHigh 12.5°C · Low 5.6°C · 39 mm rain
- Lahti in MayFinland · 448 kmHigh 14.5°C · Low 5.6°C · 48 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 Oulu) is explained once on the Oulu year overview and on the Sources, method and limits page.