Umag weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Good
Best time to visit: June – August
What is the weather like in Umag in September?
In September, Umag is warm: daytime highs average 23 °C, and nights cool down to about 18 °C. The sea averages 23.1 °C – pleasant for swimming. The sun shines for around 7 hours a day. Rain is frequent, with about 10 rainy days and 152 mm in total. All in all, September is a good month for a holiday in Umag.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 93 | 68 | 26 |
| Day | 27° | 23° | 18° |
| Night | 21° | 18° | 14° |
| Sea | 26° | 23° | 20° |
| Sun | 9 h | 7 h | 6 h |
| Rain days | 9 | 10 | 12 |
More details for September
- Daylight
- 12 h 37 min06:43 – 19:20
- UV index
- 5 · moderateclear sky, noon (estimate)All months
- Muggy days
- 4 daysdew point 18 °C or moreAll months
- Wind
- 15 km/haverage daily peakAll months
- Cloud cover
- 48 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snow
- Time zone
- UTC+2Europe/Zagreb
How the score comes together
- Temperatureweight 35 %62 %
- Seaweight 25 %87 %
- Sunshineweight 20 %68 %
- Few rainy daysweight 20 %57 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in September
- Swimwear
- Sunscreen
- Rain jacket or umbrella
Umag in September: quick answers
Is Umag hot in September?
Warm rather than hot: in September, daytime highs in Umag average 23 °C and nights cool to about 18 °C.
Can you swim in Umag in September?
Yes. In September the sea averages 23.1 °C – pleasant for swimming.
Does it rain much in Umag in September?
Rain is frequent, with about 10 rainy days and 152 mm in total.
Umag month by month
The whole year in UmagAll destinations: CroatiaWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences