Climate averages 1991–2020
Oulu weather
in September.
A cool, moderately wet month: the 4th warmest and the joint 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a cool month in Oulu: daytime highs average 12.2°C and nights cool to about 7.5°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 56 mm of rain on roughly 10 days, which makes September a moderately wet month (the joint 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 10 min on an average September day.
The nearest other city in this atlas is Luleå (167 km away). In September its highs average 12.1°C, about as warm as Oulu, with 59 mm of rain.
Among the 13 cities listed in Finland, Oulu ranks 13th of 13 for the warmest September highs and joint 6th of 13 for the driest September (rainfall, lowest first). The mean September high of those 13 cities is 13.8°C; Oulu is 1.6°C cooler than that mean.
From September to October, average highs fall by 7.2°C to 5.0°C, and monthly rainfall falls from 56 mm to 50 mm.
The annual picture
September 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 | 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, selected | 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
September in nearby cities
- Luleå in SeptemberSweden · 167 kmHigh 12.1°C · Low 8.2°C · 59 mm rain
- Kuopio in SeptemberFinland · 259 kmHigh 12.6°C · Low 8.3°C · 65 mm rain
- Umeå in SeptemberSweden · 282 kmHigh 13.0°C · Low 8.3°C · 62 mm rain
- Jyväskylä in SeptemberFinland · 308 kmHigh 13.2°C · Low 8.1°C · 54 mm rain
- Joensuu in SeptemberFinland · 341 kmHigh 12.4°C · Low 8.8°C · 68 mm rain
- Tampere in SeptemberFinland · 400 kmHigh 13.5°C · Low 8.8°C · 53 mm rain
- Pori in SeptemberFinland · 434 kmHigh 14.1°C · Low 9.4°C · 62 mm rain
- Lahti in SeptemberFinland · 448 kmHigh 14.1°C · Low 8.5°C · 51 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.