Weather in Opatija for September 2026
Yellow Wind Warning - See hour by hour.
So far, September 2026 in Opatija is slightly warmer than the historical average by 0.5 °C.
Expect cooler weather in the next days in Opatija with the forecast suggesting a temperature of 23.6 °C, lower than the historical average.
In general, the average temperature in Opatija at the beginning of September is 26.3 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 21.1 °C by the end of September.
Opatija in September brings notable rainfall, with an average of 19 rainy days and a total precipitation of 211 mm.
Is September a good time to visit Opatija? check out the best time to travel to Opatija page.
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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 | 27° /18° | 0.2 mm | 7 | |
| 2 Sept. | Sunny | 27° /19° | 0.9 mm | 6 | |
| 3 Sept. |  Patchy rain possible | 27° /19° | 0.2 mm | 6 | |
| 4 Sept. |  Heavy rain at times | 27° /19° | 0.3 mm | 6 | |
| 5 Sept. |  Moderate or heavy rain shower | 26° /19° | 3.4 mm | 6 | |
| 6 Sept. | Sunny | 25° /17° | 0.7 mm | 6 | |
| 7 Sept. | Sunny | 25° /17° | 0 mm | 6 | |
| 8 Sept. |  Cloudy | 26° /19° | 0.9 mm | 6 | |
| 9 Sept. | Moderate or heavy rain shower | 23° /17° | 13.9 mm | 4 | |
| 10 Sept. |  Overcast | 22° /14° | 38.4 mm | 4 | |
| 11 Sept. | Overcast | 21° /15° | 9.3 mm | 4 | |
| 12 Sept. | Moderate or heavy rain shower | 21° /13° | 30.6 mm | 5 | |
| 13 Sept. | Sunny | 23° /17° | 0 mm | 4.8 | |
| 14 Sept. | Overcast | 25° /19° | 0 mm | 4.6 | |
| 15 Sept. | Sunny | 24° /16° | 0 mm | 5.7 | |
| 16 Sept. | Sunny | 22° /19° | 0 mm | 5.8 | |
| 17 Sept. | Sunny | 21° /18° | 6.5 mm | 6 | |
| 18 Sept. | Patchy rain possible | 21° /19° | 15.3 mm | 5 | |
| 19 Sept. | Light rain shower | 23° /18° | 3.8 mm | 6 | |
| 20 Sept. | Sunny | 24° /19° | 0 mm | 6 | |
| 21 Sept. | Overcast | 25° /21° | 0 mm | 7 | |
| 22 Sept. | Sunny | 23° /16° | 0 mm | 6 | |
| 23 Sept. | Overcast | 23° /15° | 0 mm | 6 | |
| 24 Sept. | Sunny | 25° /20° | 0 mm | 6 | |
| 25 Sept. | Sunny | 26° /19° | 0 mm | 7 | |
| 26 Sept. | Sunny | 25° /19° | 0 mm | 6 | |
| 27 Sept. | Heavy rain at times | 20° /15° | 6.3 mm | 5 | |
| 28 Sept. | Patchy rain possible | 20° /11° | 7.1 mm | 5 | |
| 29 Sept. |  Partly cloudy | 17° /10° | 0.3 mm | 5 | |
| 30 Sept. | Partly cloudy | 15° /9° | 0.5 mm | 4 | |
| Next | |||||
Opatija weather in September vs August vs October
| August | September | October | |
|---|---|---|---|
| Weather | Sunny | Patchy rain possible | Patchy rain possible |
| Temperatures | 28°/19° | 21°/15° | 16°/11° |
| Rainfall | 66 mm | 211 mm | 262 mm |
| Wind | 12.6 km/h | 12.9 km/h | 14 km/h |
| Humidity | 61% | 73% | 78% |
| Rainy days | 13 days | 19 days | 20 days |
| Dry days | 18 days | 11 days | 11 days |
Planning a trip to Opatija? Discover the best time to visit
Opatija in September - FAQ
What are the expected maximum and minimum temperatures in Opatija during September?
How much rainfall should be expected in Opatija during September?
What are the typical wind conditions in Opatija during September?
September rainfall patterns in Opatija
UV exposure in Opatija during September
What to pack to Opatija in September?
Mild · highs around 21 °C, frequent showers
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
👟 Footwear
🎒 Accessories
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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.