Kastav Weather in September

September in Kastav brings pleasant temperatures, with highs of 21°C (70°F) and nights dropping to 13°C (55°F). The rainy season is in full swing this month, so frequent downpours are part of the picture.

Rainfall in Kastav in September

As part of the rainy season, Kastav sees around 13 days of rain in September, with an average of 205 mm (8.1 in). The rain this month falls heavily when it arrives, so waterproofs are worth keeping handy.

Temperature in Kastav in September

September in Kastav sees highs of 21°C (70°F) and lows of 13°C (55°F) overnight. Conditions are often most pleasant around the middle of the day. With overnight lows of 13°C (55°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 Kastav in September

Expect sunny days throughout the month, with an estimated 202 hours of sunshine. Despite being the rainy season, it could still be a nice time to visit. Rain often arrives later in the day, keeping most of the days sunny.

Average water temperature in September

With water at 24°C (75°F), you can expect warm, pleasant conditions for any water activity. There's no adjustment period — it feels comfortable straight away.

If you prefer dry days with pleasant temperatures, 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.

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For a detailed overview over the year and the best time to visit Croatia, check out our Kastav's climate page.

Kastav Temperature in September

Min Temperature 13°C (55°F)  

Max Temperature 21°C (70°F)  

Water Temperature 24°C (75°F) *  

Chance of Rain 43%  

Precipitation 205 mm (8.1 in)  

Rainy days 13 days  

Humidity 64% *  

Sunshine 202 hours *  

Percentage Sunshine 57% *  

* Data from: Rijeka, Croatia (5 KM, 3 Miles).

What to Wear in Kastav in September

For Kastav 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. The water temperature sits at about 24°C (75°F), making it perfect for swimming and water activities. Don't forget to pack your favorite swimwear and perhaps some snorkel gear. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.

What To Do in Kastav in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

7/10

Camping

6/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Croatia, check out our Kastav's climate page.

More climate data for Kastav

Temperature Rainfall Sunshine Humidity Water Temp

See the full Kastav climate overview or explore weather in Croatia.