Weather in Finnland in September
Country-wide climate normals across 15 cities in Finnland.
How Hot Is Finnland in September?
Mild conditions are universal across Finnland in September: highs near 14°C in Helsinki, similar elsewhere.
Sunshine in Finnland in September
Dark, overcast days dominate Finnland in September — Helsinki sees just 2.8h of sun a day, and the pattern is similar across most regions. Cloud cover is heavy and persistent, with even the brighter regions struggling to escape the gloom for long.
Does It Rain In Finnland In September?
Moderate rainfall defines Finnland's September: Helsinki averages 71mm across 12 days. Some regions see meaningfully wetter weather, especially coastal or mountain-facing areas, while continental interiors tend toward the drier end of the spectrum.
Is Finnland Humid In September?
Saturated air defines Finnland's September: humidity at 80% in Helsinki, with the country as a whole feeling muggy and oppressive. The air practically drips after rain, and even shaded outdoor areas feel warm and clammy. Plan indoor time during the most humid afternoon hours.
Wind In Finnland In September
Finnland's September has gentle wind — Helsinki averages 17 kph, and the country tracks similarly. Outdoor activity is comfortable, and afternoon thermals add a pleasant breeze in inland areas.
Cloud Cover In Finnland In September
Finnland sees mostly cloudy weather through September: Helsinki averages 69% cloud cover, and the pattern repeats across the country. Bright sun is uncommon; expect a grey, soft-lit feel to most days.