Piran Weather in September
Piran in September sees high temperatures, with highs around 24°C (75°F) and overnight lows of 18°C (64°F). Rainfall is fairly high at around 155 mm (6.1 in) on average, so pack waterproofs just in case.
Rainfall in Piran in September
Past climate data indicates that roughly 11 days will see rain, totalling around 155 mm (6.1 in) for the month. The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.
Temperature in Piran in September
Temperatures in Piran in September top out at 24°C (75°F) and drop to 18°C (64°F) overnight. Overall, the month follows a fairly predictable daily temperature pattern. 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 Piran in September
There are approximately 223 hours of sunshine this month, resulting in mostly clear days.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 Piran's climate page.
Piran Temperature in September
Min Temperature
18°C (64°F)
Max Temperature
24°C (75°F)
Chance of Rain
36%
Precipitation
155 mm (6.1 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 Piran 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 Piran in September
Browse day-by-day weather records for Piran spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Piran historical weather extremes in September
Our historical data for Piran spans 1976 to 2025, revealing these weather extremes.
- The warmest day in September was on September 22, 1985, with a maximum of 35°C (95°F).
- The lowest daytime temperature in September was 11°C (52°F), recorded on September 18, 1977.
- The coldest night in September in Piran was on September 29, 1977, with a minimum of 3°C (37°F).
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 →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Piran in September
Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. It's going to pour! Pack a good poncho and prepare for very wet conditions. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in Piran 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 Piran's climate page.
Temperature Rainfall Sunshine Humidity
See the full Piran climate overview or explore weather in Slovenia.
