Douglas 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
Fair
Best time to visit: July – August
What is the weather like in Douglas in September?
In September, Douglas is cool: daytime highs average 15 °C, and nights cool down to about 13 °C. The sea averages 15.1 °C – swimming is only for the hardy. Expect around 5 hours of sunshine a day. Rain is frequent, with about 14 rainy days and 93 mm in total. It is often windy, with gusts of around 37 km/h. All in all, September is a so-so month for a holiday in Douglas.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 60 | 52 | 29 |
| Day | 16° | 15° | 13° |
| Night | 14° | 13° | 11° |
| Sea | 15° | 15° | 14° |
| Sun | 6 h | 5 h | 3 h |
| Rain days | 13 | 14 | 17 |
More details for September
- Daylight
- 12 h 49 min06:49 – 19:38
- UV index
- 3 · moderateclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 37 km/haverage daily peakAll months
- Cloud cover
- 68 %on averageAll months
- Hot days
- 0 days30 °C or more
- Snow days
- 0 days1 cm or more of fresh snow
- Time zone
- UTC+1Europe/Isle_of_Man
How the score comes together
- Temperatureweight 50 %72 %
- Sunshineweight 20 %32 %
- Few rainy daysweight 30 %31 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Sunscreen
- A jumper for the evenings
- Rain jacket or umbrella
- Windproof jacket
Douglas in September: quick answers
Is Douglas hot in September?
No. In September, Douglas is cool: daytime highs average 15 °C and nights drop to about 13 °C.
Can you swim in Douglas in September?
Only if you don't mind cold water: in September the sea averages just 15.1 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Douglas in September?
Rain is frequent, with about 14 rainy days and 93 mm in total.
Douglas month by month
The whole year in DouglasAll destinations: Isle of ManWhere 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