Douglas
Isle of Man
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Douglas, Isle of Man

Green lawns overlooking a ferry terminal in the small town of Douglas, Isle of Man
Green lawns overlooking a ferry terminal in the small town of Douglas, Isle of Man
The first month of the autumn, September, is still a mild month in Douglas, Isle of Man, with average temperature fluctuating between 15°C (59°F) and 10°C (50°F).

Temperature

In Douglas, Isle of Man, the average high-temperature is practically the same as in August - a mild 15°C (59°F). The average low-temperature, in Douglas, is 10°C (50°F).

Rainfall

In Douglas, during September, the rain falls for 16 days and regularly aggregates up to 142mm (5.6") of precipitation. In Douglas, during the entire year, the rain falls for 198 days and collects up to 1528mm (60.2") of precipitation.

Sea temperature

In Douglas, in September, the average water temperature is 14°C (57.2°F).
Note: At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 13°C (55.4°F) is not comfortable.

Daylight

The average length of the day in September is 12.7h.

Sunshine

The average sunshine in Douglas is 4h.

UV index

In September, the average daily maximum UV index in Douglas is 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 3 interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the temperature in September in Douglas?

In Douglas, Isle of Man, in September, the average high-temperature is 15°C (59°F), and the average low-temperature is 10°C (50°F).

How many days does it rain in September in Douglas?

In Douglas, Isle of Man, in September, during 16 rainfall days, 142mm (5.6") of precipitation is typically accumulated.

How cold is the water in September in Douglas?

In September, the average sea temperature is 14°C (57.2°F). Swimming in 14°C (57.2°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation.

What is the average length of the day in September in Douglas?

The average length of the day in September is 12.7h.

How many hours of sunshine does Douglas have in September?

The average sunshine in September in Douglas, Isle of Man, is 4h.

How high is the UV index in September in Douglas?

In Douglas, Isle of Man, the average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a moderate health threat from unprotected exposure to the UV radiation.
Average temperature in September - Douglas, Isle of Man
  • Average high temperature in September: 15°C

Warmest months (with the highest average high temperature) are July and August (17°C).
Months with the lowest average high temperature are January and February (6°C).

  • Average low temperature in September: 10°C

Months with the highest average low temperature are July and August (11°C).
Coldest months (with the lowest average low temperature) are January, February and March (2°C).

Average rainfall in September - Douglas, Isle of Man
  • Average rainfall in September: 142mm

The wettest month (with the highest rainfall) is October (171mm).
The driest month (with the lowest rainfall) is May (85mm).

Average rainfall days in September - Douglas, Isle of Man
  • Average rainfall days in September: 16 days

Months with the highest number of rainy days are January and November (20 days).
The month with the lowest number of rainy days is July (13 days).

Average sea temperature in September - Douglas, Isle of Man
  • Average sea temperature in September: 14°C

The best month for swimming (with the highest average sea temperature) is August (15°C).
Coldest months (with the lowest average sea temperature) are February and March (7°C).

Average daylight in September / Average sunshine in September - Douglas, Isle of Man
  • Average daylight in September: 12.7h

The month with the longest days is June (Average daylight: 17.1h).
The month with shortest days is December (Average daylight: 7.5h).

  • Average sunshine in September: 4h

Months with most sunshine are May and June (Average sunshine: 7h).
The month with least sunshine is December (Average sunshine: 1h).

Average UV index in September - Douglas, Isle of Man
  • Average UV index in September: 3

Months with the highest UV index are June and July (UV index 6).
Months with the lowest UV index are January and December (UV index 0).