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Weather in Rijeka for September 2025

Your guide to Rijeka weather in September - trends and predictions

    Official Weather Alert ⚠️

  • Yellow Thunderstorm Warning - See hour by hour.

    • Temperatures

  • Until now, September 2025 in Rijeka is slightly cooler than the historical average by -1.2 °C.

  • Expect cooler weather in the next days in Rijeka with the forecast suggesting a temperature of 20.1 °C, lower than the historical average.

  • In general, the average temperature in Rijeka at the beginning of September is 25.3 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 17.1 °C by the end of September.

    • Rain 🌧️

  • Rijeka in September brings notable rainfall, with an average of 16 rainy days and a total precipitation of 108.5 mm.

    • More

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

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

Average dry days
14
Dry days
Average rainy days
16
Rainy days
Average snowy days
0
Snow days
Average temperatures
22°/15°
Temperatures
Average wind speed
14 km/h
Avg max wind
Average humidity
70 %
Avg humidity

Rijeka Weather September

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

Temperatures trend during September in Rijeka

See the weather trend as well as the moving average line

September weather in Rijeka day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Partly cloudy
Partly cloudy
 25° /16° 0.2 mm 6
2 Sept. Sunny
Sunny
 26° /18° 0.9 mm 6
3 Sept. Patchy rain possible
Patchy rain possible
 26° /17° 0.2 mm 6
4 Sept. Sunny
Sunny
 26° /17° 0 mm 7
5 Sept. Patchy rain possible
Patchy rain possible
 25° /17° 1.6 mm 6
6 Sept. Sunny
Sunny
 24° /16° 0.2 mm 6
7 Sept. Sunny
Sunny
 25° /16° 0 mm 6
8 Sept. Sunny
Sunny
 25° /17° 2 mm 6
9 Sept. Sunny
Sunny
 24° /16° 6.8 mm 6
10 Sept. Sunny
Sunny
 24° /15° 25.6 mm 6
11 Sept. Sunny
Sunny
 23° /16° 3.2 mm 6
12 Sept. Sunny
Sunny
 22° /15° 18.5 mm 5
13 Sept. Partly cloudy
Partly cloudy
 20° /14° 3 mm 5
14 Sept. Partly cloudy
Partly cloudy
 20° /13° 4.7 mm 5
15 Sept. Partly cloudy
Partly cloudy
 19° /12° 1.4 mm 5
16 Sept. Moderate rain
Moderate rain
 22° /14° 10 mm 1.2
17 Sept. Patchy rain possible
Patchy rain possible
 21° /11° 1.3 mm 1.3
18 Sept. Sunny
Sunny
 23° /12° 0 mm 1.4
19 Sept. Sunny
Sunny
 27° /14° 0 mm 1.6
20 Sept. Sunny
Sunny
 25° /15° 0 mm 5
21 Sept. Sunny
Sunny
 22° /16° 0 mm 5
22 Sept. Sunny
Sunny
 22° /15° 0 mm 5
23 Sept. Patchy rain possible
Patchy rain possible
 21° /15° 0.8 mm 4
24 Sept. Moderate rain
Moderate rain
 19° /16° 8.6 mm 4
25 Sept. Moderate rain
Moderate rain
 12° /9° 15.1 mm 3
26 Sept. Sunny
Sunny
 16° /9° 0 mm 4
27 Sept. Sunny
Sunny
 18° /9° 0 mm 4
28 Sept. Sunny
Sunny
 17° /9° 0 mm 4
29 Sept. Partly cloudy
Partly cloudy
 17° /10° 0 mm 4
30 Sept. Partly cloudy
Partly cloudy
 21° /11° 0 mm 6
Next
Important Notice
Our weather forecast for Rijeka 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 Rijeka forecast closer to your planned date for the most up-to-date weather information.
Change Month
‹
›

Rijeka weather in September vs August vs October

Compare September weather in Rijeka 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
Patchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Temperatures28°/19°22°/15°18°/12°
Rainfall168 mm109 mm267 mm
Wind11.8 km/h14.3 km/h14.2 km/h
Humidity63%70%79%
Rainy days12 days16 days25 days
Dry days19 days14 days6 days

Planning a trip to Rijeka? Discover the best time to visit

Guide for Rijeka in September

In September, Rijeka, Croatia experiences a transition from the warm summer weather to the cooler temperatures of autumn. At the beginning of the month, Rijeka typically enjoys pleasant temperatures around 24°, with plenty of sunshine and minimal rainfall.

The Adriatic Sea also remains warm, making it an ideal time for beach activities and water sports.

As the month progresses, the weather in Rijeka gradually cools down. By the end of September, temperatures tend to drop to around 20°, signaling the arrival of autumn. While the sea remains relatively warm, the city experiences more frequent rainfall and slightly overcast skies.

However, the weather is still generally mild, making it a great time to explore the city's cultural attractions and enjoy outdoor activities.

Overall, September in Rijeka offers a mix of summer and autumn weather, providing visitors with the opportunity to enjoy the last remnants of summer while also experiencing the changing seasons.

Whether you prefer beach days or sightseeing, Rijeka's September weather caters to a variety of interests.

Rijeka in September - FAQ

Is September a good time to visit Rijeka?
Yes, September is a good time to traveling to Rijeka, read more about the best time to visit Rijeka.
What are the expected maximum and minimum temperatures in Rijeka during September?
During September, expect a variety of temperatures with highs around 22° and lows near 15°, suitable for diverse activities and preferences.
How much rainfall should be expected in Rijeka during September?
Significant rainfall exceeding 108.5 mm is expected in Rijeka during September, occurring over more than 16 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Rijeka during September?
The average wind speed in Rijeka during September is 14 km/h, suggesting breezy to windy conditions, depending on your activities.

What to pack to Rijeka in September?

As you prepare for your trip to Rijeka 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 Rijeka, during September, is comfortable and enjoyable, regardless of the weather conditions.

  • Clothing
    • Layered Clothing: Light sweaters, long-sleeve shirts, light jackets, and comfortable pants
    • Rain Gear: Lightweight, waterproof clothing
  • Footwear
    • Waterproof Shoes
  • Accessories
    • Sunglasses: For sun protection
    • Sun Hats: Wide-brimmed hats for sun protection in warm weather
    • Umbrellas/Raincoats: For rainy days

September rainfall patterns in Rijeka

Explore the daily rainfall trends and prepare for Rijekas September weather 💧

UV exposure in Rijeka during September

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

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Location coordinates Where is Rijeka?

Get accurate weather forecasts for Rijeka, located at latitude 45.327 and longitude 14.442. Stay updated with localized weather information tailored for Rijeka.

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