September weather forecast
Coleraine, United Kingdom

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Weather in September

The first month of the autumn, September, is still a mild month in Coleraine, United Kingdom, with an average temperature varying between 10.7°C (51.3°F) and 14.7°C (58.5°F).

Temperature

The transition from August to September sees an average high-temperature of a still moderate 14.7°C (58.5°F), indicating a minor variance from the prior month. A consistent average low of 10.7°C (51.3°F) is noted throughout September, only a small step down from its daytime high.

Humidity

In Coleraine, the average relative humidity in September is 85%.

Rainfall

In Coleraine, in September, during 19.6 rainfall days, 40mm (1.57") of precipitation is typically accumulated. In Coleraine, during the entire year, the rain falls for 238.3 days and collects up to 632mm (24.88") of precipitation.

Snowfall

May through October are months without snowfall.

Daylight

In Coleraine, United Kingdom, the average length of the day in September is 12h and 43min.
On the first day of the month, sunrise is at 6:33 am and sunset at 8:19 pm. On the last day of September, in Coleraine, sunrise is at 7:28 am and sunset at 7:04 pm BST.

Sunshine

The average sunshine in September in Coleraine, United Kingdom, is 6h.

UV index

May, June, August and September, with an average maximum UV index of 4, are months with the highest UV index. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for average individuals.
Note: An average UV index of 4 in September transforms into this advice:
Adopt protective measures - It is advised to guard against sun damage. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.

Frequently asked questions

What are September temperatures in Coleraine?

September temperatures vary between a high-temperature of 14.7°C (58.5°F) and a low-temperature of 10.7°C (51.3°F).

What is the average humidity in September in Coleraine?

In September, the average relative humidity in Coleraine is 85%.

How many days does it rain in September in Coleraine?

In Coleraine, United Kingdom, in September, during 19.6 rainfall days, 40mm (1.57") of precipitation is typically accumulated.

When it does not snow in Coleraine?

May through October are months without snowfall in Coleraine, United Kingdom.

How many hours of daylight does Coleraine have in September?

In September, the average day length is 12h and 43min.

When is the sunrise / sunset in September in Coleraine?

On the first day of September in Coleraine, sunrise is at 6:33 am and sunset at 8:19 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 7:04 pm BST.

How long on average sun shines in September in Coleraine?

In Coleraine, the average sunshine duration in September is 6h.

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

The months with the highest UV index in Coleraine are May, June, August and September, with an average maximum UV index of 4.

What is the UV index intensity in September in Coleraine?

In Coleraine, United Kingdom, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium hazard to health from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Coleraine, United Kingdom

Average temperature in September - Coleraine, United Kingdom
  • Average high temperature in September: 14.7°C

The warmest month (with the highest average high temperature) is July (16°C).
The month with the lowest average high temperature is January (7.1°C).

  • Average low temperature in September: 10.7°C

The month with the highest average low temperature is August (11.8°C).
The coldest month (with the lowest average low temperature) is February (4°C).

Average pressure in September
Coleraine, United Kingdom

Average pressure in September - Coleraine, United Kingdom
  • Average pressure in September: 1013.5mbar

The month with the highest atmospheric pressure is May (1015.2mbar).
The month with the lowest atmospheric pressure is November (1006.6mbar).

Average wind speed in September
Coleraine, United Kingdom

Average wind speed in September - Coleraine, United Kingdom
  • Average wind speed in September: 21.1km/h

The windiest month (with the highest average wind speed) is January (27.5km/h).
The calmest month (with the lowest average wind speed) is July (16.7km/h).

Average humidity in September
Coleraine, United Kingdom

Average humidity in September - Coleraine, United Kingdom
  • Average humidity in September: 85%

The months with the highest relative humidity are July and August (86%).
The month with the lowest relative humidity is April (81%).

Average rainfall in September
Coleraine, United Kingdom

Average rainfall in September - Coleraine, United Kingdom
  • Average rainfall in September: 40mm

The wettest months (with the highest rainfall) are July and August (74mm).
The driest month (with the least rainfall) is April (35mm).

Average rainfall days in September
Coleraine, United Kingdom

Average rainfall days in September - Coleraine, United Kingdom
  • Average rainfall days in September: 19.6 days

The month with the highest number of rainy days is August (24 days).
The month with the least rainy days is April (16.8 days).

Average snowfall in September
Coleraine, United Kingdom

Average snowfall in September - Coleraine, United Kingdom
  • Average snowfall in September: 0mm

The month with the highest snowfall is February (16mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).

Average snowfall days in September
Coleraine, United Kingdom

Average snowfall days in September - Coleraine, United Kingdom
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (2.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in September /
Average sunshine in September
Coleraine, United Kingdom

Average daylight in September / Average sunshine in September - Coleraine, United Kingdom
  • Average daylight in September: 12h and 4min

The month with the longest days is June (Average daylight: 17h and 18min).
The month with the shortest days is December (Average daylight: 7h and 18min).

  • Average sunshine in September: 6h and 0min

The month with the most sunshine is June (Average sunshine: 8h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).

Average sunshine days in September
Coleraine, United Kingdom

Average sunshine days in September - Coleraine, United Kingdom
  • Average sunshine days in September: 6.3 days

The month with the most sunshine days is April (9.8 days).
The month with the least sunshine days is August (4.2 days).

Average UV index in September
Coleraine, United Kingdom

Average UV index in September - Coleraine, United Kingdom
  • Average UV index in September: 4

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

Average cloud cover in September
Coleraine, United Kingdom

Average cloud cover in September - Coleraine, United Kingdom
  • Average cloud cover in September: 58

The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is April (Cloud cover 52).

Average visibility in September
Coleraine, United Kingdom

Average visibility in September - Coleraine, United Kingdom
  • Average visibility in September: 9km

The month with the highest visibility is November (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October and December (9km).

Coleraine, United Kingdom

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