Sečovlje Weather in September
September in Sečovlje brings high temperatures around 24°C (75°F) during the day, dropping to 18°C (64°F) at night, with quite a bit of rainfall expected, averaging around 150 mm (5.9 in) for the month.
Rainfall in Sečovlje in September
Historically, approximately 11 days this month are expected to have rain, averaging 150 mm (5.9 in). When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.
Temperature in Sečovlje in September
September in Sečovlje sees highs of 24°C (75°F) and lows of 18°C (64°F) overnight. Conditions stay fairly consistent through the month, making it easier to plan what to wear. With overnight lows of 18°C (64°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.
Sunshine in Sečovlje in September
Expect a lot of sunshine this month, with about 223 hours of sun. These sunny conditions add to the overall experience.If you prefer enjoying temperate temperatures and rain-free days, May, 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.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Slovenia, check out our Sečovlje's climate page.
Sečovlje Temperature in September
Min Temperature
18°C (64°F)
Max Temperature
24°C (75°F)
Chance of Rain
36%
Precipitation
150 mm (5.9 in)
Rainy days
11 days
Humidity
57% *
Sunshine
223 hours *
Percentage Sunshine
*
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Sečovlje typically drop from around 26°C (79°F) at the start of September to approximately 22°C (72°F) by the end. Nights are cool, with lows typically ranging from 12°C (54°F) to 16°C (61°F).
Average temperatures in September
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
Historical weather for Sečovlje in September
Browse day-by-day weather records for Sečovlje spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Sečovlje historical weather extremes in September
Based on 49 years of weather observations in Sečovlje between 1976 and 2025, these are the recorded extremes.
- The warmest day in September was on September 23, 1985, with a maximum of 34°C (93°F).
- The coldest September day was on September 18, 1977, with a maximum of 11°C (52°F).
- The lowest overnight temperature recorded in September was 4°C (39°F) (September 29, 1977).
Best Places in Slovenia in September
Find out more about the weather in Slovenia and which places have the best travel conditions in this month. See all of Slovenia in September →
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What to Wear in Sečovlje in September
For Sečovlje in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Also bring a poncho, it will rain a lot! Waterproof everything you can. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in Sečovlje in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Slovenia, check out our Sečovlje's climate page.
Temperature Rainfall Sunshine Humidity
See the full Sečovlje climate overview or explore weather in Slovenia.
