Posio Weather in September

In Posio, September brings low daytime temperatures around 12°C (54°F), with nights cooling to 5°C (41°F). Expect quite a bit of rainfall this month.

Rainfall in Posio in September

You can expect rain on around 18 days based on historical patterns, with 70 mm (2.8 in) average for the month. With rain spread across many days but low totals, showers are typically short and light rather than heavy.

Temperature in Posio in September

Temperatures in Posio in September top out at 12°C (54°F) and drop to 5°C (41°F) overnight. Even at the warmest part of the day, temperatures stay low. Dressing warmly from the start is the sensible approach. With overnight lows of 5°C (41°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.

For Posio itself, July generally stands out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

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

Posio Temperature in September

Min Temperature 5°C (41°F)  

Max Temperature 12°C (54°F)  

Chance of Rain 59%  

Precipitation 70 mm (2.8 in)  

Rainy days 18 days  

Humidity 85% *  

* Data from: Kuusamo, Finland (48 KM, 30 Miles).

What to Wear in Posio in September

The weather can be unpredictable in September, so pack clothes you can easily mix and match. You could bring jeans, other long pants, and a few t-shirts. A light jacket or light sweater will be pleasant for the cooler moments. Rain is likely on several days, so bring a good rain jacket.

What To Do in Posio in September

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

Cycling

6/10

Walking

6/10

Barbeque

3/10

Camping

4/10

Outdoor sports

6/10

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 Posio's climate page.

More climate data for Posio

Temperature Rainfall Humidity

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