Early autumn · Weather & things to do
Piran in September
Piran cools off: highs slip to 75°F (24°C), from 84°F in August, with lows of 61°F (16°C) and about 4.4 in (113 mm) of rain.
At 82/100 for comfort (6th of 12), it's one of the best months to visit.
- Avg high
- 75°F (24°C)
- Avg low
- 61°F (16°C)
- Rain
- 4.4 in (113 mm)
- Humidity
- 71%
- Cloud cover
- 55%
- Daylight
- ~12 h 18 min
- Comfort score
- 82/100 · Great
What September feels like
Warm afternoons near 75°F (24°C) make long days outdoors easy.
After dark, temperatures fall to about 61°F (16°C).
Showers are part of the month, adding up to about 4.4 in (113 mm).
Plan around September
September is one of Piran's best months on the climate data.
- Last warm month for a while: October highs fall to 66°F.
- Start of the wettest three-month stretch (September – November), which brings about 13.3 in (338 mm) in total.
- Last of the best-scoring months: by October, the score drops to 81/100.
- Comfort holds steady from August (84 → 82/100).
- September sits inside the May – Sep window our Slovenia’s Alpine Lakes route recommends.
What to pack for September
- Light, breathable clothes75°F afternoons
- Packable rain jacket or umbrellaa shower or two is likely
- Comfortable walking shoesmost picks involve some walking
What to do in Piran in September
With conditions on your side, the picks below favor time outside.
Punta Lighthouse Promenade
Rocky swimming spots and ladders around Piran's point.
Why now September scores 82/100 for comfort, good conditions for being outside.
Sergej Mašera Maritime Museum
Harbor-front museum on Piran's seafaring and salt-making history.
Fritolin pri Cantini
Self-service seafood spot on Tartini Square for fried squid and sardines.
Why now Highs near 75°F and 4.4 in of monthly rain make this an easy outdoor pick.
Sečovlje Salina Nature Park
Working salt pans and wetland near Piran, with saltworks still harvested by hand.
Why now One to do outside while the weather is on your side.
Church of St. George
Hilltop church with a bell tower over the town and the Gulf of Piran.
Nearby in September
- Ljubljana in September~58 mi · highs 71°F, 4.6 in rain · 2°C (4°F) cooler by day, about as wet
- Lake Bled in September~64 mi · highs 69°F, 4.9 in rain · 3°C (6°F) cooler by day, about as wet
- Cortina d'Ampezzo in September~98 mi · highs 62°F, 3.9 in rain · 7°C (12°F) cooler by day, about as wet
- Val Gardena in September~116 mi · highs 62°F, 3.9 in rain · 7°C (12°F) cooler by day, about as wet
NASA POWER 2001–2025 monthly averages on a ~50 km grid, temperatures adjusted from the grid cell's ~256 m to Piran's ~3 m elevation (standard lapse rate). Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Piran in September: quick answers
Is September a good time to visit Piran?
Yes. On the climate data it's one of the best months, scoring 82/100. Expect highs of 75°F (24°C) and 4.4 in (113 mm) of rain. September is inside the May – Sep window our Slovenia’s Alpine Lakes route recommends.
How hot is Piran in September?
Average highs are 75°F (24°C) and average lows 61°F (16°C), making it the 4th-warmest month by daytime highs.
Does it rain a lot in Piran in September?
Some: about 4.4 in (113 mm) of rain falls across September on average, the 2nd-wettest month of the year. The annual total is about 40.4 in (1027 mm).
What should I pack for Piran in September?
Bring light, breathable clothes (75°F afternoons), packable rain jacket or umbrella (a shower or two is likely) and comfortable walking shoes (most picks involve some walking).
Routes in season in September
- Slovenia’s Alpine Lakes May – Sep
Planning Piran in September?
Share this September plan with your group, poll everyone on dates and keep the packing list in one place.