September weather forecastTrefonen, United Kingdom
September
Weather in September
The first month of the autumn, September, is also an enjoyable month in Trefonen, United Kingdom, with an average temperature fluctuating between 16.4°C (61.5°F) and 8.5°C (47.3°F).Temperature
The average high-temperature during September registers at a still comfortable 16.4°C (61.5°F), closely corresponding to the preceding month. During September, the nighttime temperature averages of 8.5°C (47.3°F).Humidity
In September, the average relative humidity is 87%.Rainfall
In Trefonen, during September, the rain falls for 14.2 days and regularly aggregates up to 29mm (1.14") of precipitation. In Trefonen, United Kingdom, during the entire year, the rain falls for 192.1 days and collects up to 422mm (16.61") of precipitation.Snowfall
May through October are months without snowfall.Daylight
In September, the average length of the day is 12h and 40min.On the first day of September, sunrise is at 6:23 am and sunset at 8:00 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 6:51 pm BST.
Sunshine
In Trefonen, the average sunshine in September is 6.3h.UV index
The average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In September, the UV index of 3 transforms into the following advice:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Trefonen, United Kingdom
- Average high temperature in September: 16.4°C
The warmest month (with the highest average high temperature) is July (19°C).
The month with the lowest average high temperature is January (6.1°C).
- Average low temperature in September: 8.5°C
The month with the highest average low temperature is August (10.8°C).
The coldest month (with the lowest average low temperature) is January (1°C).
Average pressure in September
Trefonen, United Kingdom
- Average pressure in September: 1015.9mbar
The month with the highest atmospheric pressure is May (1016.3mbar).
The month with the lowest atmospheric pressure is November (1009.3mbar).
Average wind speed in September
Trefonen, United Kingdom
- Average wind speed in September: 12.2km/h
The windiest month (with the highest average wind speed) is February (16.5km/h).
The calmest month (with the lowest average wind speed) is June (11.3km/h).
Average humidity in September
Trefonen, United Kingdom
- Average humidity in September: 87%
The months with the highest relative humidity are November and December (91%).
The months with the lowest relative humidity are April and May (83%).
Average rainfall in September
Trefonen, United Kingdom
- Average rainfall in September: 29mm
The wettest month (with the highest rainfall) is June (54mm).
The driest month (with the least rainfall) is April (27mm).
Average rainfall days in September
Trefonen, United Kingdom
- Average rainfall days in September: 14.2 days
The month with the highest number of rainy days is July (19.8 days).
The month with the least rainy days is February (13.6 days).
Average snowfall in September
Trefonen, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is January (22mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Trefonen, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (3.8 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
Trefonen, United Kingdom
- Average daylight in September: 12h and 42min
The month with the longest days is June (Average daylight: 16h and 48min).
The month with the shortest days is December (Average daylight: 7h and 42min).
- Average sunshine in September: 6h and 18min
The month with the most sunshine is July (Average sunshine: 7h and 0min).
The month with the least sunshine is November (Average sunshine: 3h and 42min).
Average sunshine days in September
Trefonen, United Kingdom
- Average sunshine days in September: 10.9 days
The month with the most sunshine days is March (12.6 days).
The month with the least sunshine days is July (7.2 days).
Average UV index in September
Trefonen, United Kingdom
- Average UV index in September: 3
The months with the highest UV index are May, June, July and August (UV index 4).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Trefonen, United Kingdom
- Average cloud cover in September: 60
The month with the most cloud cover is November (Cloud cover 65).
The month with the least cloud cover is April (Cloud cover 55).
Average visibility in September
Trefonen, United Kingdom
- Average visibility in September: 7km
The months with the highest visibility are January, February, March, April, May, June, July and December (8km).
The months with the lowest visibility are August, September, October and November (7km).
