Weather in Opatija for September 2025
Yellow Thunderstorm Warning - See hour by hour.
Until now, September 2025 in Opatija is slightly cooler than the historical average by -0.6 °C.
Expect cooler weather in the next days in Opatija with the forecast suggesting a temperature of 20.1 °C, lower than the historical average.
In general, the average temperature in Opatija at the beginning of September is 25.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 16.4 °C by the end of September.
Opatija in September brings notable rainfall, with an average of 20 rainy days and a total precipitation of 277.8 mm.
Is September a good time to visit Opatija? check out the best time to travel to Opatija page.
New! Chat with our AI weatherman - it’s amazing and free.
Official Weather Alert ⚠️
Temperatures
Rain 🌧️
More
Opatija Weather September
Temperatures trend during September in Opatija
September weather in Opatija day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Sunny | 26° /18° | 0.2 mm | 7 | |
| 2 Sept. | Sunny | 27° /18° | 1.4 mm | 7 | |
| 3 Sept. |  Patchy rain possible | 26° /18° | 0.3 mm | 6 | |
| 4 Sept. |  Heavy rain at times | 28° /18° | 0.5 mm | 7 | |
| 5 Sept. |  Moderate or heavy rain shower | 25° /18° | 5.1 mm | 6 | |
| 6 Sept. | Patchy rain possible | 24° /16° | 1 mm | 6 | |
| 7 Sept. | Sunny | 24° /16° | 0 mm | 6 | |
| 8 Sept. |  Cloudy | 25° /17° | 1.3 mm | 6 | |
| 9 Sept. | Moderate or heavy rain shower | 22° /17° | 16.6 mm | 5 | |
| 10 Sept. |  Overcast | 22° /14° | 38.2 mm | 5 | |
| 11 Sept. | Overcast | 21° /15° | 4.8 mm | 5 | |
| 12 Sept. | Moderate or heavy rain shower | 21° /13° | 30.6 mm | 5 | |
| 13 Sept. | Moderate or heavy rain shower | 18° /13° | 20 mm | 4 | |
| 14 Sept. | Moderate rain at times | 18° /12° | 10.6 mm | 5 | |
| 15 Sept. | Moderate rain at times | 16° /10° | 1.4 mm | 4 | |
| 16 Sept. |  Moderate rain | 22° /14° | 10 mm | 1.2 | |
| 17 Sept. | Patchy rain possible | 21° /11° | 1.3 mm | 1.3 | |
| 18 Sept. | Sunny | 23° /12° | 0 mm | 1.4 | |
| 19 Sept. | Sunny | 27° /14° | 0 mm | 1.6 | |
| 20 Sept. | Sunny | 25° /15° | 0 mm | 5 | |
| 21 Sept. | Sunny | 22° /16° | 0 mm | 5 | |
| 22 Sept. | Sunny | 22° /15° | 0 mm | 5 | |
| 23 Sept. | Patchy rain possible | 21° /15° | 0.8 mm | 4 | |
| 24 Sept. | Moderate rain | 19° /16° | 8.6 mm | 4 | |
| 25 Sept. | Moderate rain | 12° /9° | 15.1 mm | 3 | |
| 26 Sept. | Sunny | 16° /9° | 0 mm | 4 | |
| 27 Sept. | Sunny | 18° /9° | 0 mm | 4 | |
| 28 Sept. | Sunny | 17° /9° | 0 mm | 4 | |
| 29 Sept. |  Partly cloudy | 17° /10° | 0 mm | 4 | |
| 30 Sept. | Partly cloudy | 16° /8° | 0 mm | 5 | |
| Next | |||||
Opatija weather in September vs August vs October
| August | September | October | |
|---|---|---|---|
| Weather | Sunny | Patchy rain possible | Patchy rain possible |
| Temperatures | 30°/19° | 21°/14° | 17°/12° |
| Rainfall | 69 mm | 278 mm | 254 mm |
| Wind | 13 km/h | 15 km/h | 12.1 km/h |
| Humidity | 60% | 72% | 82% |
| Rainy days | 3 days | 20 days | 16 days |
| Dry days | 28 days | 10 days | 15 days |
Planning a trip to Opatija? Discover the best time to visit
Opatija in September - FAQ
What to pack to Opatija in September?
As you prepare for your trip to Opatija 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 Opatija, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Warm Clothing: Sweaters, hoodies, long 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
- Scarves: To protect you from the cold wind
- Gloves/Mittens: Essential for cold weather
- Warm Hats: Warm hats for insulation in cold weather
- Umbrellas/Raincoats: For rainy days
September rainfall patterns in Opatija
UV exposure in Opatija during September
Quick links
Where is Opatija?Get accurate weather forecasts for Opatija, located at latitude 45.337 and longitude 14.308. Stay updated with localized weather information tailored for Opatija.