Croatia Split Weather in September — Climate Guide
September in Split is very-high
September is very-high for Split.
September is many regulars' favorite month in Split — warm sea, easing crowds, and lower prices than the summer peak. It averages 26°C/18°C with pleasant, mostly sunny days.
The Adriatic holds its summer warmth (~23-24°C), so swimming and island-hopping continue, but the August intensity drains away: the alleys breathe, beaches are calmer, catamarans are easier to book, and prices drop noticeably. Early September still feels like summer; by late September there's a gentle autumn edge to the evenings.
Travel score
Split September Weather Stats
Avg High
26°C
Avg Low
18°C
Rainy Days
7
75mm total
Sunshine
8h
Daily avg
Humidity
63%
comfortable
UV Index
7
High
Wind
10 km/h
Gusts 22
Sea Temp
24°C
Avg water temp
Crowds
Busy
At attractions
September Sunrise & Sunset
Air Quality
PM2.5
15 μg/m³
PM10
25 μg/m³
Status
good
Feels-Like Temperature & Wind
Feels like
Daytime
27°C
Nighttime
18°C
Humidity and wind affect how the actual temperature feels.
Wind
10 km/h
Max gust 22 km/h
Activities Recommended for September
September Travel Pros & Cons
Pros
- Warm sea (~23-24°C) with easing crowds
- Lower prices than July-August
- Islands and day trips still open
- Calmer palace and beaches
Cons
- Slightly more rain than mid-summer
- Ferry schedules thin from late September
- Cooler evenings late in the month
- Still busy in early September
September Events & Festivals
- Best shoulder-season month — warm, swimmable, calmer
- Sea still warm (~23-24°C)
- Crowds and prices easing after August
- Island ferries still on summer schedules early in the month
Split in September — Full Picture
September is many regulars' favorite month in Split — warm sea, easing crowds, and lower prices than the summer peak. It averages 26°C/18°C with pleasant, mostly sunny days.
The Adriatic holds its summer warmth (~23-24°C), so swimming and island-hopping continue, but the August intensity drains away: the alleys breathe, beaches are calmer, catamarans are easier to book, and prices drop noticeably. Early September still feels like summer; by late September there's a gentle autumn edge to the evenings.
Ferry schedules stay near-full early in the month, so Hvar, Brač, Vis, and Krka are all easy. It's an ideal blend of beach weather and uncrowded sightseeing — the palace and Marjan are a pleasure without the cruise mob.
Rainfall ticks up a little versus mid-summer, so pack a light layer and a small umbrella alongside your summer kit. For warm-sea beach days without the August crush, September is the smart pick.
What to Wear & What to Pack
Warm early autumn — around 26°C/18°C with a still-warm sea. Light summer clothing by day, a light layer for evenings. UV 7 — hat, sunglasses, SPF 30+. The sea stays swimmable (~23-24°C).
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
18.3°C
10.3°C
9.7/mo
Summer (Jun·Jul·Aug)
29.7°C
20°C
5.7/mo
Autumn (Sep·Oct·Nov)
Current21°C
13.7°C
9.3/mo
Winter (Dec·Jan·Feb)
11.7°C
5.3°C
11/mo
Split Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| 11° | 5° | 11d·80mm | 4.5h | 70% | 2 | Quiet | Low season | |
| 12° | 5° | 10d·65mm | 5h | 68% | 2 | Quiet | Low season | |
| 14° | 7° | 10d·65mm | 6h | 65% | 3 | Quiet | Low season | |
| 18° | 10° | 10d·65mm | 7h | 64% | 5 | Moderate | Shoulder | |
| May (Best) | 23° | 14° | 9d·55mm | 9h | 62% | 7 | Busy | Shoulder |
| June (Best) | 27° | 18° | 8d·50mm | 10h | 60% | 9 | Busy | Peak |
| 31° | 21° | 4d·25mm | 12h | 56% | 10 | Very busy | Peak | |
| 31° | 21° | 5d·45mm | 11h | 58% | 10 | Very busy | Peak | |
| September (Best) | 26° | 18° | 7d·75mm | 8h | 63% | 7 | Busy | Shoulder |
| 21° | 14° | 9d·95mm | 6h | 67% | 4 | Moderate | Shoulder | |
| 16° | 9° | 12d·110mm | 4h | 70% | 2 | Quiet | Low season | |
| 12° | 6° | 12d·95mm | 4h | 71% | 1 | Quiet | Shoulder |
View Other Months
Split September Hotel Picks
Frequently Asked Questions
Is September a good time to visit Split?
Split in September is very-high. Tourist crowds are busy and flight/hotel prices are shoulder.
What's the average temperature in Split in September?
Split September averages a high of 26°C and a low of 18°C.
Does it rain much in Split in September?
Split September averages 75mm of rainfall over about 7 rainy days.
What should I wear in Split in September?
Warm early autumn — around 26°C/18°C with a still-warm sea. Light summer clothing by day, a light layer for evenings. UV 7 — hat, sunglasses, SPF 30+. The sea stays swimmable (~23-24°C).
What time are sunrise and sunset in Split in September?
Split September sunrise is 06:30 and sunset is 19:10, with 12h 40min of daylight.
What's the air quality like in Split in September?
Split September air quality (AQI) averages 38, rated Good. PM2.5 averages 15μg/m³.
What activities are recommended in Split in September?
In September, Split is great for Swimming — sea still warm, Hvar & Brač island day trips, Krka Waterfalls.
Is September peak season in Split?
Split September crowds are busy and prices are shoulder. Advance reservations are strongly recommended.
Best Months to Visit Split
View Other Months
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.