If you plan to visit Oulu in September, the weather is typically alright, with an average high temperature of +54°F during the day and approximately 3 sunny days. Expect some rainy, though, as there are typically 16 rainy days in the month and around 59 mm of precipitation. The weather is changeable so you may have to pack for every eventuality. Search flightsin one click on Avionero.
Average weather
☀️
+54°F
Avg. max. temperature
+27°F
Min.
+75°F
Max.
59 mm
Total precipitation
82%
Avg. humidity
3 m/s
Avg. wind
3 ☀️
Sunny Days
10 ⛅️
Cloudy
16 🌦
Rainy
Our opinion: Oulu has OK weather in September.
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Average temperature in Oulu in September
Here are the expected maximum, average and minimum temperatures in Oulu for September based on the historical data.
Last Year
Historical Data
Going from a maximum of +72°F during the day to a minimum of +34°F during the night, the temperature in September averages around +61°F.
The average maximum temperature goes down 14% by the end of the month, compared with the beginning of the month, from +64°F to +59°F.
Is Oulu warm or cold in September?
Oulu is typically mild in September.
Maximum temperatures go down compared to the previous month from +63°F to +54°F. The minimum temperature also goes down from +52°F to +45°F.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how September is compared to other months in Oulu:
Water temperature in Oulu in September
Water in Oulu in September is Cold. It varies from +49°F to +60°F, with an average of +55°F.Note that the air temperature is lower than the water temperature, averaging around +54°F.
The water temperature in September is one of the warmest of the entire year:
The warmest water temperatures in Oulu are reached in July, when the average sea temperature rises to +62°F. The coldest water temperatures are in February, with an average of +31°F.
Can you swim in Oulu in September?
We would not recommend swimming in Oulu in September, the water is very cold (+55°F on average). Consider swimming only if you are an experienced cold-water swimmer with proper gear.
🦭
Cold
Below +61°F
🏄♂️
Fresh
61°F - 70°F
🏊
Comfortable
70°F - 77°F
👙
Warm
77°F - 82°F
🔥
Very warm
+82°C and up
You will need a full-body wetsuit, cap, gloves, a warm change of clothes, and a hot drink ready for after your swim.
Climate in Oulu in September
Oulu weather looks like this, on average, in September and the surrounding months.
August
September
October
Avg. temperature
+63°F
+54°F
+41°F
Min. temperature
+36°F
+27°F
+1°F
Max. temperature
+84°F
+75°F
+68°F
Rainfall
77 mm
59 mm
47 mm
Wind
3 m/s
3 m/s
4 m/s
Avg. water temperature
+61°F
+55°F
+46°F
Humidity
78%
82%
86%
Air pressure
1010 HPa
1010 HPa
1009 HPa
Sunny days
4
3
3
Cloudy days
9
10
12
Rainy days
17
16
12
Snowy days
0
0
5
September weather is still as ok as in August.It’s getting colder in September. From +63°F in the day, the average maximum temperature lowers to +54°F.As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 77 mm to 59 mm.Humidity rises from 78% to 82%.The average wind speed doesn’t change much during September, staying around 3 m/s.The days becoming less sunny, going from 4 sunny days in August to 3 in September.
Next month (October) brings a further decline in the weather.
Wind speed in Oulu in September based on historical data.
Last Year
Historical Data
The average wind speed is 3 m/s getting up to 5 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Oulu is gradually increasing during September, going from 2 m/s to 2 m/s over the course of the month.
Rain
Amount of rainfall in mm during September in Oulu based on historical data.
Last Year
Historical Data
Typically, there is a 70% chance of rain on an average day in September, with total rainfall of approximately 85 mm. The maximum amount of rainfall per day is around 11 mm, which is considered light rain.September is a pretty wet month with over 21 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of wellies.
September is one of the rainiest months in Oulu, here is a comparison with other months, total mm:
Oulu wettest month is August, where a typical day has a 55% chance of precipitation and 77 mm of rainfall per day. January, on the other hand, is the driest month with a mere 0% chance of precipitation and 2 mm of rainfall per day.
How was the weather last September in Oulu?
This is the weather in Oulu in September 2023:
1 September
☁️
+64°F
2 September
☁️
+65°F
3 September
☁️
+63°F
4 September
🌧️
+63°F
5 September
☀️
+60°F
6 September
☀️
+62°F
7 September
☀️
+63°F
8 September
☀️
+67°F
9 September
☀️
+71°F
10 September
☁️
+63°F
11 September
☀️
+68°F
12 September
☁️
+65°F
13 September
☀️
+60°F
14 September
☀️
+59°F
15 September
☀️
+58°F
16 September
🌧️
+56°F
17 September
🌧️
+55°F
18 September
☀️
+56°F
19 September
☀️
+58°F
20 September
☁️
+54°F
21 September
🌧️
+59°F
22 September
☀️
+71°F
23 September
☁️
+64°F
24 September
🌧️
+59°F
25 September
☀️
+57°F
26 September
☁️
+58°F
27 September
☁️
+58°F
28 September
☀️
+58°F
29 September
🌧️
+58°F
30 September
🌧️
+59°F
In September 2023 Oulu had 14 sunny days, 9 cloudy days, and 7 rainy days. The average maximum temperature was +61°F, with an absolute maximum of +72°F and a minimum of +54°F. The average humidity was 89%, with a maximum of 100% and a minimum of 54%. The average wind speed was 3 m/s, with a maximum of 9 m/s and a minimum of 0 m/s.
Are you planning a trip in September?
Climate Change Over the Years
This is how Oulu climate has changed over the last 43 years.
The climate in Oulu in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1985 (+37°F) and the highest in 2020 (+47°F). The driest year was 2002 with only 247 mm of rainfall, and the wettest year was 2021 with 603 mm.
FAQ
Frequently asked questions about the weather in Oulu in September:
Is September a good time to visit Oulu?
It’s always a good time to visit Oulu, but the weather is changeable in September, so plan a mix of indoor and outdoor activities and exploring, and pack for every eventuality.
Can you sunbathe in Oulu in September?
September has mild temperatures in Oulu. Not ideal for sunbathing, but still good for daytime outdoor activities, but plan for cool evenings. Pack a light jacket and shorts!
Can you swim in Oulu in September?
Swimming in Oulu in September is challenging and not recommended for inexperienced swimmers or without proper equipment and preparation.
Is Oulu rainy in September?
Oulu is often rainy in September. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.
Is it sunny in Oulu in September?
Usually, it’s not very sunny in Oulu in September, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.
Other cities in Finland
Check out the weather for other cities in Finland.
For this page, we’ve looked at the typical weather in Oulu, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
