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Weather in Grad Split for September 2026

Your guide to Grad Split weather in September - trends and predictions

    Official Weather Alert ⚠️

  • Yellow Thunderstorm Warning - See hour by hour.

    • Temperatures

  • So far, September 2026 in Grad Split is slightly warmer than the historical average by 0.9 °C.

  • Expect cooler weather in the next days in Grad Split with the forecast suggesting a temperature of 20.5 °C, lower than the historical average.

  • In general, the average temperature in Grad Split at the beginning of September is 27 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18.4 °C by the end of September.

    • Rain 🌧️

  • Grad Split experiences moderate rainfall in September, with an average of 7 rainy days and a total precipitation of 78.7 mm.

    • More

  • Is September a good time to visit Grad Split? check out the best time to travel to Grad Split page.

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
23
Dry days
Average rainy days
7
Rainy days
Average snowy days
0
Snow days
Average temperatures
24°/18°
Temperatures
Average wind speed
18 km/h
Avg max wind
Average humidity
61 %
Avg humidity

Grad Split Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
27°
2
Sunny
27°
3
Sunny
27°
4
Partly cloudy
27°
5
Sunny
27°
6
Sunny
28°
7
Sunny
26°
8
Sunny
27°
9
Partly cloudy
26°
10
Sunny
26°
11
Sunny
26°
12
Sunny
26°
13
Sunny
26°
14
Sunny
24°
15
Partly cloudy
25°
16
Sunny
24°
17
Heavy rain at times
25°
18
Weather Alert Patchy rain possible
25°
19
Sunny
25°
20
Sunny
25°
21
Overcast
26°
22
Sunny
22°
23
Sunny
22°
24
Sunny
23°
25
Sunny
23°
26
Overcast
18°
27
Sunny
16°
28
Sunny
16°
29
Sunny
18°
30
Overcast
15°

Temperatures trend during September in Grad Split

See the weather trend as well as the moving average line

September weather in Grad Split day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Sunny
Sunny
 27° /20° 0.6 mm 7
2 Sept. Sunny
Sunny
 27° /20° 0.1 mm 7
3 Sept. Sunny
Sunny
 27° /20° 0.3 mm 6
4 Sept. Partly cloudy
Partly cloudy
 27° /20° 0.6 mm 7
5 Sept. Sunny
Sunny
 27° /20° 1.3 mm 7
6 Sept. Sunny
Sunny
 28° /20° 2.1 mm 7
7 Sept. Sunny
Sunny
 26° /20° 0 mm 7
8 Sept. Sunny
Sunny
 27° /20° 0.1 mm 7
9 Sept. Partly cloudy
Partly cloudy
 26° /20° 5 mm 6
10 Sept. Sunny
Sunny
 26° /19° 1.6 mm 6
11 Sept. Sunny
Sunny
 26° /19° 6.2 mm 6
12 Sept. Sunny
Sunny
 26° /18° 2.1 mm 6
13 Sept. Sunny
Sunny
 26° /17° 3.2 mm 7
14 Sept. Sunny
Sunny
 24° /18° 0.2 mm 6
15 Sept. Partly cloudy
Partly cloudy
 25° /18° 1.1 mm 6
16 Sept. Sunny
Sunny
 24° /18° 3.1 mm 6
17 Sept. Heavy rain at times
Heavy rain at times
 25° /17° 6.3 mm 6
18 Sept. Patchy rain possible
Patchy rain possible
 25° /19° 1.6 mm 5.3
19 Sept. Sunny
Sunny
 25° /20° 0.2 mm 4.5
20 Sept. Sunny
Sunny
 25° /20° 0 mm 5.5
21 Sept. Overcast
Overcast
 26° /20° 0 mm 5.2
22 Sept. Sunny
Sunny
 22° /15° 0 mm 6
23 Sept. Sunny
Sunny
 22° /13° 0 mm 6
24 Sept. Sunny
Sunny
 23° /13° 0 mm 6
25 Sept. Sunny
Sunny
 23° /17° 0 mm 6
26 Sept. Overcast
Overcast
 18° /11° 0 mm 5
27 Sept. Sunny
Sunny
 16° /8° 0 mm 5
28 Sept. Sunny
Sunny
 16° /7° 0 mm 5
29 Sept. Sunny
Sunny
 18° /8° 0 mm 5
30 Sept. Overcast
Overcast
 15° /12° 12 mm 4
Next
Important Notice
Our weather forecast for Grad Split in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Grad Split forecast closer to your planned date for the most up-to-date weather information.
Change Month
‹
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Grad Split weather in September vs August vs October

Compare September weather in Grad Split with the previous and following months. See how temperature, rainfall, wind, and other conditions change throughout the year to help you plan your visit.
AugustSeptemberOctober
WeatherSunny
Sunny
Sunny
Sunny
Sunny
Sunny
Temperatures28°/21°24°/18°20°/15°
Rainfall51 mm79 mm73 mm
Wind17.3 km/h17.8 km/h18.1 km/h
Humidity55%61%64%
Rainy days6 days7 days7 days
Dry days25 days23 days24 days

Planning a trip to Grad Split? Discover the best time to visit

Grad Split in September - FAQ

What are the expected maximum and minimum temperatures in Grad Split during September?
During September, expect a variety of temperatures with highs around 24° and lows near 18°, suitable for diverse activities and preferences.

How much rainfall should be expected in Grad Split during September?
Moderate rainfall is anticipated in Grad Split during September, with a total of 78.7 mm spread over approximately 7 days. Considering plans for rainy days is advisable.

What are the typical wind conditions in Grad Split during September?
The average wind speed in Grad Split during September is 18 km/h, suggesting breezy to windy conditions, depending on your activities.

Grad Split water temperatures in September

The average water temperature of the Adriatic Sea near Grad Split in September is 24.2 °C. At the beginning of September temperatures are around 24.2 °C; by the end of the month they stay fairly steady and reach 24.5 °C.

What is the water temperature in Grad Split in September?
The average water temperature in Grad Split in September is 24.2 °C.
Can you swim in Grad Split in September?
Ideal conditions for families and casual swimmers. You can stay in for long swims or reef explorations with no thermal protection required.

September rainfall patterns in Grad Split

Explore the daily rainfall trends and prepare for Grad Splits September weather 💧
Typically, Grad Split has 7 rainy days in September with a total of 78.7 mm of rainfall.

UV exposure in Grad Split during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

What to pack to Grad Split in September?

🌦️ Mild · highs around 24 °C, frequent showers

As you prepare for your trip to Grad Split in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Grad Split, during September, is comfortable and enjoyable, regardless of the weather conditions.

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🎒 Accessories

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Location coordinates Where is Grad Split?

Get accurate weather forecasts for Grad Split, located at latitude 43.509 and longitude 16.439. Stay updated with localized weather information tailored for Grad Split.

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