Weather in Slowenien in September
Country-wide climate normals across 15 cities in Slowenien.
How Hot Is Slowenien in September?
Slowenien's September brings reliable warmth — typical highs of 21°C nationwide, with Ljubljana representative and regional variation from 10°C to 24°C.
Sunshine in Slowenien in September
Slowenien's September brings mixed skies — Ljubljana averages 4.5h of sun, with similar conditions nationwide. Cloudy periods alternate with sunny stretches, and the sun is up between 6:40 am and 7:10 pm. Plan for variability rather than guaranteed sunshine.
Does It Rain In Slowenien In September?
Wet conditions dominate Slowenien in September — Ljubljana sees 155mm of rain across 12 days, with rain a near-daily feature in most regions. Some areas see considerably more, particularly mountain-facing or windward coasts. Plan around frequent showers and pack reliable rainwear.
Is Slowenien Humid In September?
Heavy oppressive humidity covers Slowenien in September: 76% on average in Ljubljana, and similar saturating conditions exist nationwide. The air feels thick and heavy from sunrise to sundown, with little overnight respite. Coastal and tropical regions feel especially stifling.
Wind In Slowenien In September
Winds are light across Slowenien in September — averaging 10 kph in Ljubljana, with mostly still air across the country. Outdoor activity is comfortable; sailing and similar wind-dependent sports may struggle. The pattern is consistent in most regions.
Cloud Cover In Slowenien In September
Cloudy skies dominate Slowenien in September — 54% cover in Ljubljana, with similar overcast conditions in most regions. Direct sun is patchy and broken; expect grey stretches between brief bright moments. Coastal areas may be heavier than inland.