FinlandThe weather in September in Posio
It's cool in September in Posio with an average temperature of 12°C. Temperatures this month range from a low of 9°C to a high of 15°C. At night, you can expect temperatures between 3°C and 9°C.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in September for Posio, Finland. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 23°C in 2023, Posio reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 1°C in 2014. The extreme nighttime temperatures ranged from a lowest recorded value of -5°C to a highest value of 15°C.
Precipitation and snowfall
In September, there is an average of 59 mm of precipitation, spread over 9 days. Of the total precipitation, about 0,3 cm falls as snow in September. The wind speed is around 4 Bft, mostly coming from the Southwest.
Daily weather in September for Posio
Click on any day in September to get detailed info about the usual weather on that day in Posio. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Posio | New York | |
|---|---|---|
| Average temperature | 12°C | 27°C |
| Max. temperature | 15°C | 31°C |
| Min. temperature | 3°C | -5°C |
| Total precipitation | 59 mm | 57 mm |
| Rainy days | 9 days | 9 days |
| Total snowfall | 0,3 cm | 0 cm |
| Snowy days | 1 day | 0 days |
Start of September
The month of September starts in Posio with cool temps, averaging around 14°C during the day and nights around 7°C.
Mid September
By mid-September, daytime temps drop to around 11°C, with nights around 6°C. There’s a chance of some showers during this time, but plenty of dry and sunny days too.
End of September
By the end of September, the average daytime temperature in Posio is around 10°C, while nighttime temps are about 5°C. A shower might pop up, but overall, the weather will be dry and sunny.
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UV index
The UV index is a maximum of 4 this month. That's a moderate value on the intensity scale of 1 to 11. Unprotected skin can burn in about 30 minutes.
Check out the climate of Posio for all months and discover the best travel time
Curious about the weather in other parts of Finland? Check out the climate and weather for spots like Helsinki, Rovaniemi, Kuusamo, or explore other destinations in Finland.
Temperature charts
These charts show the average temperatures in September in Posio, Finland. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Posio
Temperature in September in Posio over the years
Precipitation charts
These charts show the average amount of precipitation in September in Posio, Finland. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in September in Posio
Total precipitation in September in Posio over the years
Daily Snowfall in September in Posio
Snowfall in September in Posio per year
Daily UV index in September in Posio
This chart shows the average daily UV index in September in Posio, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Weather experiences in September in Posio
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Average weather in Posio by month
Click on a month below to see detailed weather info for Posio. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.