September weather forecast
Trefin, United Kingdom

September

Weather in September

September, the first month of the autumn in Trefin, is still a mild month, with an average temperature fluctuating between 15.8°C (60.4°F) and 13.4°C (56.1°F).

Temperature

Transitioning into September, Trefin experiences an average high-temperature of a still refreshing 15.8°C (60.4°F), marking a minor shift from the preceding month. Night temperatures in September in Trefin exhibit a subtle decrease, settling at an average of 13.4°C (56.1°F).

Humidity

In Trefin, the average relative humidity in September is 82%.

Rainfall

In Trefin, during September, the rain falls for 17.8 days and regularly aggregates up to 59mm (2.32") of precipitation. In Trefin, during the entire year, the rain falls for 225.4 days and collects up to 791mm (31.14") of precipitation.

Snowfall

April through October are months without snowfall in Trefin, United Kingdom.

Daylight

The average length of the day in September in Trefin is 12h and 39min.
On the first day of the month, sunrise is at 6:33 am and sunset at 8:07 pm. On the last day of September, sunrise is at 7:20 am and sunset at 7:00 pm BST.

Sunshine

The average sunshine in September is 7.2h.

UV index

The months with the highest UV index in Trefin are May through October, with an average maximum UV index of 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the average person.
Note: In September, a regular UV index of 4 translates into these guidelines:
Act with care - Obligation to protect against skin and eye damage is highlighted. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Experience reduced UV exposure by about half when donning a wide-brim hat.

Frequently asked questions

What are the temperatures in Trefin in September?
The average high-temperature and low-temperature during September are 15.8°C (60.4°F) and 13.4°C (56.1°F) respectively.
What is the average humidity in September in Trefin?
In Trefin, United Kingdom, the average relative humidity in September is 82%.
How many days does it rain in September in Trefin?
In September, in Trefin, United Kingdom, the rain falls for 17.8 days. Throughout September, 59mm (2.32") of precipitation is accumulated.
When it does not snow in Trefin?
In Trefin, United Kingdom, snow does not fall in April through October.
What is the average length of the day in September in Trefin?
In Trefin, the average day length in September is 12h and 39min.
When is the sunrise / sunset in September in Trefin?
In September, on the first day of the month, sunrise is at 6:33 am and sunset at 8:07 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 7:00 pm BST.
How long on average sun shines in September in Trefin?
In Trefin, United Kingdom, the average sunshine duration in September is 7.2h.
When is the highest UV index in Trefin?
The months with the highest UV index are May through October, with an average maximum UV index of 4.
How high is the UV index in September in Trefin?
The average daily maximum UV index in September in Trefin, United Kingdom, is 4. A UV Index estimate of 3 to 5 represents a medium hazard to health from exposure to the Sun's UV radiation.
Average high temperature
Average low temperature
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
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
Trefin, United Kingdom
  • Average high temperature in September: 15.8°C

The warmest month (with the highest average high temperature) is August (17°C).
The month with the lowest average high temperature is February (8.3°C).

  • Average low temperature in September: 13.4°C

The month with the highest average low temperature is August (14.7°C).
The coldest month (with the lowest average low temperature) is February (5.8°C).

Average pressure in September
Trefin, United Kingdom
  • Average pressure in September: 1016.5mbar

The month with the highest atmospheric pressure is May (1016.6mbar).
The month with the lowest atmospheric pressure is November (1009.4mbar).

Average wind speed in September
Trefin, United Kingdom
  • Average wind speed in September: 23.1km/h

The windiest month (with the highest average wind speed) is December (30.8km/h).
The calmest month (with the lowest average wind speed) is June (18.8km/h).

Average humidity in September
Trefin, United Kingdom
  • Average humidity in September: 82%

The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is November (80%).

Average rainfall in September
Trefin, United Kingdom
  • Average rainfall in September: 59mm

The wettest month (with the highest rainfall) is November (108mm).
The driest month (with the least rainfall) is May (34mm).

Average rainfall days in September
Trefin, United Kingdom
  • Average rainfall days in September: 17.8 days

The month with the highest number of rainy days is November (23.2 days).
The month with the least rainy days is May (14.8 days).

Average snowfall in September
Trefin, United Kingdom
  • Average snowfall in September: 0mm

The months with the highest snowfall are January and February (6mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).

Average snowfall days in September
Trefin, United Kingdom
  • Average snowfall days in September: 0 days

The months with the highest number of snowfall days are January and February (0.8 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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

The month with the longest days is June (Average daylight: 16h and 36min).
The month with the shortest days is December (Average daylight: 7h and 54min).

  • Average sunshine in September: 7h and 1min

The month with the most sunshine is May (Average sunshine: 8h and 30min).
The month with the least sunshine is December (Average sunshine: 3h and 42min).

Average sunshine days in September
Trefin, United Kingdom
  • Average sunshine days in September: 9.5 days

The month with the most sunshine days is May (13.7 days).
The months with the least sunshine days are November and December (4.5 days).

Average UV index in September
Trefin, United Kingdom
  • Average UV index in September: 4

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

Average cloud cover in September
Trefin, United Kingdom
  • Average cloud cover in September: 50

The months with the most cloud cover are November and December (Cloud cover 63).
The month with the least cloud cover is May (Cloud cover 45).

Average visibility in September
Trefin, United Kingdom
  • Average visibility in September: 10km

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

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