September weather - Autumn 2024 - Douglas, Isle of Man

Weather in September
Frequently asked questions
Average temperature in September
Average pressure in September
Average wind speed in September
Average humidity in September
Average rainfall in September
Average rainfall days in September
Average snowfall in September
Average snowfall days in September
Average sea temperature in September
Average daylight in September
Average sunshine in September
Average sunshine days in September
Average UV index in September
Average cloud cover in September
Average visibility in September

Green lawns overlooking a ferry terminal in the small town of Douglas, Isle of Man

Weather in September

The transition to autumn commences in September for Douglas. Although temperatures have a slight drop for both highs and lows, they remain above the annual average. Rainfall sees a notable reduction from August's peak, though is still considerable. Meanwhile, daylight hours start to recede, along with a decline in the amount of sunshine hours. However, a drop-in humidity accompanies the advent of autumn, giving a break from the muggy summer air.

Temperature

Douglas marks the onset of September with an average high-temperature of a moderate 15.4°C (59.7°F), subtly divergent from August's 16.1°C (61°F). Douglas welcomes an average low temperature of 13.6°C (56.5°F) in September, a gentle shift from the day's high.

Humidity

In September, the average relative humidity in Douglas is 81%.

Rainfall

In Douglas, in September, during 13.5 rainfall days, 37mm (1.46") of precipitation is typically accumulated. In Douglas, during the entire year, the rain falls for 184.8 days and collects up to 478mm (18.82") of precipitation.

Snowfall

In Douglas, snow does not fall in April through October.

Sea temperature

In Douglas, Isle of Man, in September, the average water temperature is 14°C (57.2°F).
Note: Immersing oneself in 14°C (57.2°F) at sub-10°C (14°F) temperatures is a recipe for harsh cold shock and quickened breathing unless adequately equipped.

Daylight

The average length of the day in September in Douglas is 12h and 42min.
On the first day of September in Douglas, sunrise is at 06:27 and sunset at 20:08. On the last day of the month, sunrise is at 07:19 and sunset at 18:56 BST.

Sunshine

In Douglas, the average sunshine in September is 7h.

UV index

May through September, with an average maximum UV index of 4, are months with the highest UV index. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The UV index of 4 in September translates into these instructions:
Guard yourself - Precautionary measures against sun damage are advocated. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.

Updated: Jan 25, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average September temperature in Douglas?

The high-temperature, in September, in Douglas, is 15.4°C (59.7°F), while the low-temperature averages to 13.6°C (56.5°F).

What is the average humidity in September in Douglas?

In September, the average relative humidity in Douglas, Isle of Man, is 81%.

How much does it rain in Douglas in September?

In Douglas, Isle of Man, in September, during 13.5 rainfall days, 37mm (1.46") of precipitation is typically accumulated.

When it does not snow in Douglas?

April through October are months without snowfall.

How cold is the water in September in Douglas?

In September, the average sea temperature in Douglas is 14°C (57.2°F). Swimming in 14°C (57.2°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.

How many hours of daylight does Douglas have in September?

The average day length in September is 12h and 42min.

When is the sunrise / sunset in September in Douglas?

In September, on the first day of the month, sunrise is at 06:27 and sunset at 20:08. On the last day of the month, sunrise is at 07:19 and sunset at 18:56 BST.

How many hours of sunshine does Douglas have in September?

In Douglas, Isle of Man, the average sunshine duration in September is 7h.

What is the month with the highest UV index in Douglas?

May through September, with an average maximum UV index of 4, are months with the highest UV index.

How high is the UV index in September in Douglas?

In Douglas, Isle of Man, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate vulnerability from unsafe exposure to Sun's UV rays.

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

16.1°C 61°F

15.4°C 59.7°F

13.7°C 56.7°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

26.9km/h 16.7mph

29.5km/h 18.3mph

32.9km/h 20.4mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

10.8

13.9

10.3

Average UV index

Average cloud cover

51%

57%

Average visibility

10km 6.2mi

Average temperature in September
Douglas, Isle of Man

Average high temperature in September: 15.4°C

The warmest month (with the highest average high temperature) is August (16.1°C).
The month with the lowest average high temperature is February (7.8°C).

Average low temperature in September: 13.6°C

The month with the highest average low temperature is August (14.3°C).
The coldest month (with the lowest average low temperature) is February (5.9°C).

Average pressure in September
Douglas, Isle of Man

Average pressure in September: 1014.8mbar

The month with the highest atmospheric pressure is May (1015.9mbar).
The month with the lowest atmospheric pressure is November (1008mbar).

Average wind speed in September
Douglas, Isle of Man

Average wind speed in September: 28.6km/h

The windiest month (with the highest average wind speed) is December (36.7km/h).
The calmest month (with the lowest average wind speed) is June (21.5km/h).

Average humidity in September
Douglas, Isle of Man

Average humidity in September: 81%

The months with the highest relative humidity are June and July (84%).
The month with the lowest relative humidity is November (77%).

Average rainfall in September
Douglas, Isle of Man

Average rainfall in September: 37mm

The wettest month (with the highest rainfall) is November (62mm).
The driest month (with the least rainfall) is April (23mm).

Average rainfall days in September
Douglas, Isle of Man

Average rainfall days in September: 13.5 days

The month with the highest number of rainy days is November (17.8 days).
The months with the least rainy days are May and June (13.2 days).

Average snowfall in September
Douglas, Isle of Man

Average snowfall in September: 0mm

The months with the highest snowfall are January and December (5mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).

Average snowfall days in September
Douglas, Isle of Man

Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (0.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 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).
The 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: 12h and 4min

The month with the longest days is June (Average daylight: 17h and 6min).
The month with the shortest days is December (Average daylight: 7h and 30min).

Average sunshine in September: 7h and 0min

The month with the most sunshine is May (Average sunshine: 8h and 18min).
The months with the least sunshine are January, November and December (Average sunshine: 3h and 54min).

Average sunshine days in September
Douglas, Isle of Man

Average sunshine days in September: 13.9 days

The month with the most sunshine days is May (16.3 days).
The month with the least sunshine days is November (9 days).

Average UV index in September
Douglas, Isle of Man

Average UV index in September: 4

The months with the highest UV index are May, June, July, August and September (UV index 4).
The months with the lowest UV index are January, February and March (UV index 2).

Average cloud cover in September
Douglas, Isle of Man

Average cloud cover in September: 51

The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is May (Cloud cover 46).

Average visibility in September
Douglas, Isle of Man

Average visibility in September: 10km

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

September weather forecast
Douglas, Isle of Man

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