Weather in Lettland in September
Country-wide climate normals across 15 cities in Lettland.
How Hot Is Lettland in September?
Lettland's small geographic footprint means September is uniformly mild — typical 17°C highs nationwide.
Sunshine in Lettland in September
Variable weather dominates Lettland in September: 3.5h of direct sun on a typical day in Riga, with daylight from 6:55 am to 7:40 pm. Expect both bright and cloudy days across the month, and slight regional differences between coastal and inland zones.
Does It Rain In Lettland In September?
Moderate rainfall defines Lettland's September: Riga averages 67mm across 11 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 Lettland Humid In September?
Saturated air defines Lettland's September: humidity at 77% in Riga, 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 Lettland In September
Light breezes are typical across Lettland in September: 18 kph in Riga, with similar gentle wind conditions in most regions. The air moves enough to keep things fresh on warm days but not enough to be disruptive. Coastal cities may see slightly more.
Cloud Cover In Lettland In September
Lettland sees mostly cloudy weather through September: Riga averages 63% cloud cover, and the pattern repeats across the country. Bright sun is uncommon; expect a grey, soft-lit feel to most days.