Oulu Weather in September

September in Oulu averages 14°C (57°F) during the day and 7°C (45°F) at night. Quite a bit of rainfall is typical this month, with around 66 mm (2.6 in) on average. An umbrella is a good idea.

Rainfall in Oulu in September

This month experiences about 16 days of rain according to historical data, averaging 66 mm (2.6 in). With rain spread across many days but low totals, showers are typically short and light rather than heavy.

Temperature in Oulu in September

Oulu in September gets highs of 14°C (57°F) during the day and drops to 7°C (45°F) at night. Temperatures can feel cooler in the morning and evening, so layering is often the best approach. Nights drop to 7°C (45°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet.

Sunshine in Oulu in September

The month brings about 135 hours of sunlight, offering a comfortable mix of sun and overcast.

Wind Speed in Oulu in September

Average wind speeds reach 3 m/s (6 knots) in September, creating light breezes that feel pleasant throughout the day. Some days are calmer, while others bring slightly more active breezes.

Average water temperature in September

At 12°C (54°F), the water is very cold. Most people find it too uncomfortable for anything beyond a brief wade.

Should you favor a climate that's both dry and comfortably warm, July typically offers the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Finland, check out our Oulu's climate page.

Oulu Temperature in September

Min Temperature 7°C (45°F)  

Max Temperature 14°C (57°F)  

Water Temperature 12°C (54°F)  

Chance of Rain 53%  

Precipitation 66 mm (2.6 in)  

Rainy days 16 days  

Humidity 82%  

Windspeed 3 m/s (6 knots)  

Sunshine 135 hours  

Percentage Sunshine 29%  

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Oulu typically drop from around 15°C (59°F) at the start of September to approximately 10°C (50°F) by the end. Nights are cold, with lows typically ranging from 3°C (37°F) to 8°C (46°F).

Average temperatures in September

‹ Select year to compare to 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976 ›

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

‹ January February March April May June July August September October November December ›

Daily Historical Precipitation

50-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in September

‹ Select year to compare to 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976 ›

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

‹ January February March April May June July August September October November December ›

Historical weather for Oulu in September

Browse day-by-day weather records for Oulu spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

‹ 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 ›

‹ January February March April May June July August September October November December ›

Oulu historical weather extremes in September

Based on 49 years of weather observations (1976-2025), these are the most extreme conditions recorded in Oulu.

• The hottest September day on record in Oulu reached 24°C (75°F) (September 2, 2019).
• The lowest daytime temperature in September was 1°C (34°F), recorded on September 25, 1986.
• The coldest night in September in Oulu was on September 30, 1978, with a minimum of -6°C (21°F).

What to Wear in Oulu in September

The weather can swing between comfortable and chilly in September, so flexibility is key. Pack a variety of tops, at least one warm layer, and both shorts and long pants. This gives you options no matter what the day brings. Wet weather is likely, so pack waterproof gear for multiple rainy days. Expect water temperatures of around 12°C (54°F), which is definitely too cold for comfortable swimming. Your luggage space is better used for other items. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.

What To Do in Oulu in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

5/10

Cycling

6/10

Walking

6/10

Camping

4/10

Outdoor sports

10/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Finland, check out our Oulu's climate page.

More climate data for Oulu

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Oulu climate overview or explore weather in Finland.