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
The arrival of September denotes a barely perceptible change in the average high-temperatures to a still enjoyable 16.4°C (61.5°F) from August's 17.5°C (63.5°F). Pontlliw's September nights witness minimal differential from the daytime temperatures, with averages of 11.9°C (53.4°F).Humidity
In Pontlliw, the average relative humidity in September is 84%.Rainfall
In Pontlliw, during September, the rain falls for 17.5 days and regularly aggregates up to 54mm (2.13") of precipitation. In Pontlliw, during the entire year, the rain falls for 219.6 days and collects up to 745mm (29.33") of precipitation.Snowfall
In Pontlliw, snow does not fall in April through November.Daylight
The average length of the day in September is 12h and 38min.On the first day of the month, sunrise is at 6:29 am and sunset at 8:02 pm. On the last day of September, sunrise is at 7:16 am and sunset at 6:55 pm BST.
Sunshine
The average sunshine in September in Pontlliw 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 estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: The maximum daily UV index of 4 during September translates into the following directions:
Undertake protective steps - Preventing sun damage is advised. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Pontlliw?
What is the average humidity in September in Pontlliw?
How much does it rain in Pontlliw in September?
When it does not snow in Pontlliw?
How many hours of daylight does Pontlliw have in September?
When is the sunrise / sunset in September in Pontlliw?
How many hours of sunshine does Pontlliw have in September?
When is the highest UV index in Pontlliw?
What is the UV index intensity in September in Pontlliw?
Average temperature in September
Pontlliw, United Kingdom
- Average high temperature in September: 16.4°C
The warmest month (with the highest average high temperature) is July (17.8°C).
The month with the lowest average high temperature is February (7.7°C).
- Average low temperature in September: 11.9°C
The month with the highest average low temperature is August (13.6°C).
The coldest month (with the lowest average low temperature) is February (4.5°C).
Average pressure in September
Pontlliw, United Kingdom
- Average pressure in September: 1016.6mbar
The month with the highest atmospheric pressure is May (1016.7mbar).
The month with the lowest atmospheric pressure is November (1009.7mbar).
Average wind speed in September
Pontlliw, United Kingdom
- Average wind speed in September: 18.1km/h
The windiest month (with the highest average wind speed) is December (23.9km/h).
The calmest month (with the lowest average wind speed) is June (15.4km/h).
Average humidity in September
Pontlliw, United Kingdom
- Average humidity in September: 84%
The months with the highest relative humidity are January, August, October, November and December (85%).
The month with the lowest relative humidity is April (81%).
Average rainfall in September
Pontlliw, United Kingdom
- Average rainfall in September: 54mm
The wettest month (with the highest rainfall) is December (84mm).
The driest month (with the least rainfall) is May (37mm).
Average rainfall days in September
Pontlliw, United Kingdom
- Average rainfall days in September: 17.5 days
The month with the highest number of rainy days is December (21.5 days).
The month with the least rainy days is April (15.1 days).
Average snowfall in September
Pontlliw, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is December (8mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Pontlliw, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (1.3 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
Pontlliw, 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 0min
The months with the most sunshine are April and May (Average sunshine: 8h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in September
Pontlliw, United Kingdom
- Average sunshine days in September: 9.7 days
The month with the most sunshine days is May (12.8 days).
The month with the least sunshine days is August (6.5 days).
Average UV index in September
Pontlliw, 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, November and December (UV index 2).
Average cloud cover in September
Pontlliw, United Kingdom
- Average cloud cover in September: 51
The month with the most cloud cover is December (Cloud cover 63).
The months with the least cloud cover are April and May (Cloud cover 46).
Average visibility in September
Pontlliw, 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).
