Contents
- 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 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
September
Weather in September
Temperature
Llanharan indicates an average high-temperature of a still comfortable 16.6°C (61.9°F) in September, showing minor variation from August's 18.3°C (64.9°F). Throughout the month of September, Llanharan reports a steady low-temperature average of 10.4°C (50.7°F).Humidity
In September, the average relative humidity in Llanharan, United Kingdom, is 85%.Rainfall
In Llanharan, in September, during 10.1 rainfall days, 18mm (0.71") of precipitation is typically accumulated. In Llanharan, United Kingdom, during the entire year, the rain falls for 150.3 days and collects up to 270mm (10.63") of precipitation.Snowfall
May through October are months without snowfall.Daylight
The average length of the day in September in Llanharan is 12h and 38min.On the first day of the month, sunrise is at 6:27 am and sunset at 7:59 pm. On the last day of September, in Llanharan, sunrise is at 7:13 am and sunset at 6:53 pm BST.
Sunshine
In September, the average sunshine is 6.8h.UV index
The months with the highest UV index in Llanharan are May through September, with an average maximum UV index of 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.Note: A daily high UV index of 4 in September leads to these guidelines:
Ensure safety - Sun damage prevention is strongly urged. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Llanharan in September?
What is the average humidity in September in Llanharan?
How many days does it rain in September in Llanharan?
When it does not snow in Llanharan?
How many hours of daylight does Llanharan have in September?
When is the sunrise / sunset in September in Llanharan?
How long on average sun shines in September in Llanharan?
What is the month with the highest UV index in Llanharan?
How high is the UV index in September in Llanharan?
Average temperature in September
Llanharan, United Kingdom
- Average high temperature in September: 16.6°C
The warmest month (with the highest average high temperature) is July (18.8°C).
The month with the lowest average high temperature is January (7°C).
- Average low temperature in September: 10.4°C
The month with the highest average low temperature is August (12.2°C).
The coldest month (with the lowest average low temperature) is January (3.1°C).
Average pressure in September
Llanharan, United Kingdom
- Average pressure in September: 1016.7mbar
The months with the highest atmospheric pressure are May and September (1016.7mbar).
The month with the lowest atmospheric pressure is November (1009.9mbar).
Average wind speed in September
Llanharan, United Kingdom
- Average wind speed in September: 15.4km/h
The windiest month (with the highest average wind speed) is February (21.3km/h).
The calmest month (with the lowest average wind speed) is June (14.4km/h).
Average humidity in September
Llanharan, United Kingdom
- Average humidity in September: 85%
The months with the highest relative humidity are November and December (88%).
The months with the lowest relative humidity are April and May (82%).
Average rainfall in September
Llanharan, United Kingdom
- Average rainfall in September: 18mm
The wettest month (with the highest rainfall) is November (35mm).
The driest month (with the least rainfall) is May (11mm).
Average rainfall days in September
Llanharan, United Kingdom
- Average rainfall days in September: 10.1 days
The month with the highest number of rainy days is November (15.4 days).
The month with the least rainy days is April (9.5 days).
Average snowfall in September
Llanharan, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is January (6mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Llanharan, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (2.3 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
Llanharan, 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: 6h and 5min
The month with the most sunshine is May (Average sunshine: 7h and 54min).
The month with the least sunshine is November (Average sunshine: 3h and 42min).
Average sunshine days in September
Llanharan, United Kingdom
- Average sunshine days in September: 14.7 days
The month with the most sunshine days is April (16.8 days).
The month with the least sunshine days is November (10.7 days).
Average UV index in September
Llanharan, United Kingdom
- 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, March, November and December (UV index 2).
Average cloud cover in September
Llanharan, United Kingdom
- Average cloud cover in September: 53
The month with the most cloud cover is November (Cloud cover 63).
The months with the least cloud cover are April and May (Cloud cover 49).
Average visibility in September
Llanharan, United Kingdom
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
