Vantaa Weather in September

September in Vantaa brings moderate temperatures, with daytime highs of 16°C (61°F) and nights around 8°C (46°F). Quite a bit of rainfall is expected, around 64 mm (2.5 in), so pack an umbrella.

Rainfall in Vantaa in September

You can expect rain on around 17 days based on historical patterns, with 64 mm (2.5 in) average for the month. This is a month with many wet days but modest rainfall totals, so showers are generally light and easy to manage.

Temperature in Vantaa in September

Daytime highs in Vantaa in September reach 16°C (61°F), with nights around 8°C (46°F). A light jacket or extra layer can be useful, especially outside the warmest hours of the day. At 8°C (46°F) overnight, it gets properly cold after dark. On the bright side, cold nights tend to make for excellent sleeping conditions.

Sunshine in Vantaa in September

The city usually sees around 151 hours of sunlight, indicating a moderately sunny period.

Wind Speed in Vantaa in September

Wind speeds average 3 m/s (6 knots) during September. At this speed, light breezes keep leaves and small twigs in gentle motion while the wind also provides natural cooling. Since this is an average, some days are more tranquil while others have more persistent light winds that are more noticeable.

Average water temperature in September

The water temperature is 13°C (55°F), chilly, but perfectly fine for a swim if you're not too sensitive to cold water. A short wetsuit can make longer sessions more comfortable.

If you prefer dry days with pleasant temperatures, June, July and August typically offer 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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• October
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For a detailed overview over the year and the best time to visit Finland, check out our Vantaa's climate page.

Vantaa Temperature in September

Min Temperature 8°C (46°F)  

Max Temperature 16°C (61°F)  

Water Temperature 13°C (55°F) *  

Chance of Rain 56%  

Precipitation 64 mm (2.5 in)  

Rainy days 17 days  

Humidity 84% *  

Windspeed 3 m/s (6 knots) *  

Sunshine 151 hours *  

Percentage Sunshine *  

* Data from: Helsinki, Finland (3 KM, 2 Miles).

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Vantaa typically drop from around 17°C (63°F) at the start of September to approximately 12°C (54°F) by the end. Nights are cold, with lows typically ranging from 5°C (41°F) to 10°C (50°F).

Average temperatures in September

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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

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Historical weather for Vantaa in September

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

Historical weather Temperatures Precipitation

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

Vantaa historical weather extremes in September

According to our 49 years of weather records for Vantaa, the following extremes were recorded between 1976 and 2025.

• On September 5, 2024, temperatures climbed to 27°C (81°F), marking the warmest September day on record.
• Vantaa experienced its chilliest September day on September 23, 2014, reaching only 5°C (41°F).
• Nighttime temperatures dropped to -6°C (21°F) on September 30, 1993, marking the coldest September night on record.

What to Wear in Vantaa in September

Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days. With water temperatures around 13°C (55°F), the water is quite cold for swimming. You can skip the swimwear unless you're particularly tough. Bring sunglasses since you'll have some sunny periods throughout the month

What To Do in Vantaa 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

Barbeque

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 Vantaa's climate page.

More climate data for Vantaa

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

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