Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
September's arrival in Oulu comes with a decrease in the average high-temperature, moving from an enjoyable 18°C (64.4°F) in August to a moderate 13°C (55.4°F). Throughout the month of September, Oulu reports a steady low-temperature average of 7.7°C (45.9°F).Humidity
In Oulu, Finland, the average relative humidity in September is 82%.Rainfall
The months with the least rainfall are April and September Rain falls for 12.5 days and accumulates 25mm (0.98") of rain.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows in Oulu. Throughout September, in the average 0.2 snowfall days, it receives 2mm (0.08") of snow. In Oulu, during the entire year, snow falls for 107.1 days and aggregates up to 1131mm (44.53") of snow.Sea temperature
In Oulu, the average seawater temperature in September is 12.8°C (55°F).Note: It is risky to swim in 12.8°C (55°F). Temperatures beneath 10°C (50°F) induce rapid cold shock and hyperventilation.
Daylight
The average length of the day in September is 13h and 4min.On the first day of the month, sunrise is at 05:59 and sunset at 20:36. On the last day of September, sunrise is at 07:26 and sunset at 18:49 EEST.
Sunshine
In Oulu, the average sunshine in September is 6.7h.UV index
In Oulu, the average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the average person.Note: During September, 3 as the daily maximum UV index converts into the following advice:
Guard yourself - Avoiding sunburn is suggested. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
Frequently asked questions
What is the usual temperature for Oulu in September?
What is the average humidity in September in Oulu?
What is the driest month in Oulu?
How much does it rain in Oulu in September?
When does it start to snow in Oulu?
What is the sea water temperature in September in Oulu?
How many hours of daylight does Oulu have in September?
When are sunrise and sunset in September in Oulu?
How long on average sun shines in September in Oulu?
What is the UV index intensity in September in Oulu?
Average temperature in September
Oulu, Finland
- Average high temperature in September: 13°C
The warmest month (with the highest average high temperature) is July (20°C).
The month with the lowest average high temperature is January (-6.1°C).
- Average low temperature in September: 7.7°C
The month with the highest average low temperature is July (12.4°C).
The coldest month (with the lowest average low temperature) is January (-10.6°C).
Average pressure in September
Oulu, Finland
- Average pressure in September: 1011.4mbar
The month with the highest atmospheric pressure is May (1014mbar).
The month with the lowest atmospheric pressure is December (1005.4mbar).
Average wind speed in September
Oulu, Finland
- Average wind speed in September: 12.8km/h
The windiest month (with the highest average wind speed) is November (13.7km/h).
The calmest month (with the lowest average wind speed) is July (10.6km/h).
Average humidity in September
Oulu, Finland
- Average humidity in September: 82%
The months with the highest relative humidity are January and February (95%).
The month with the lowest relative humidity is June (69%).
Average rainfall in September
Oulu, Finland
- Average rainfall in September: 25mm
The wettest month (with the highest rainfall) is July (59mm).
The driest months (with the least rainfall) are April and September (25mm).
Average rainfall days in September
Oulu, Finland
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is July (15.8 days).
The month with the least rainy days is February (3.3 days).
Average snowfall in September
Oulu, Finland
- Average snowfall in September: 2mm
The month with the highest snowfall is March (232mm).
The months with the least snowfall are June, July and August (0mm).
Average snowfall days in September
Oulu, Finland
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is January (21.4 days).
The months with the least snowfall days are July and August (0 days).
Average sea temperature in September
Oulu, Finland
- Average sea temperature in September: 12.8°C
The best month for swimming (with the highest average sea temperature) is July (16.7°C).
The coldest months (with the lowest average sea temperature) are January and February (-0.6°C).
Average daylight in September /
Average sunshine in September
Oulu, Finland
- Average daylight in September: 13h and 1min
The month with the longest days is June (Average daylight: 21h and 42min).
The month with the shortest days is December (Average daylight: 3h and 54min).
- Average sunshine in September: 6h and 4min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is December (Average sunshine: 1h and 0min).
Average sunshine days in September
Oulu, Finland
- Average sunshine days in September: 14.7 days
The month with the most sunshine days is June (17 days).
The month with the least sunshine days is December (7.4 days).
Average UV index in September
Oulu, Finland
- Average UV index in September: 3
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 1).
Average cloud cover in September
Oulu, Finland
- Average cloud cover in September: 55
The month with the most cloud cover is February (Cloud cover 77).
The month with the least cloud cover is July (Cloud cover 43).
Average visibility in September
Oulu, Finland
- Average visibility in September: 9km
The month with the highest visibility is June (10km).
The months with the lowest visibility are January, February and March (6km).
Oulu, Finland
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