Omiš 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: July – August
What is the weather like in Omiš in September?
In September, Omiš is warm: daytime highs average 23 °C, and nights cool down to about 20 °C. The sea averages 23.1 °C – pleasant for swimming. The sun shines for around 8 hours a day. Rain falls on about 8 days, adding up to 105 mm. All in all, September is a good month for a holiday in Omiš.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 99 | 73 | 36 |
| Day | 26° | 23° | 19° |
| Night | 23° | 20° | 17° |
| Sea | 25° | 23° | 21° |
| Sun | 10 h | 8 h | 6 h |
| Rain days | 5 | 8 | 11 |
More details for September
- Daylight
- 12 h 35 min06:31 – 19:06
- UV index
- 6 · highclear sky, noon (estimate)All months
- Muggy days
- 8 daysdew point 18 °C or moreAll months
- Wind
- 18 km/haverage daily peakAll months
- Cloud cover
- 39 %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 %78 %
- Few rainy daysweight 20 %72 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in September
- Swimwear
- Sunscreen
Omiš in September: quick answers
Is Omiš hot in September?
Warm rather than hot: in September, daytime highs in Omiš average 23 °C and nights cool to about 20 °C.
Can you swim in Omiš in September?
Yes. In September the sea averages 23.1 °C – pleasant for swimming.
Does it rain much in Omiš in September?
Rain falls on about 8 days, adding up to 105 mm.
Omiš month by month
The whole year in OmišAll 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