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
Weather in September
Temperature
Alltwen, United Kingdom, experiences an average high-temperature of a still refreshing 16.4°C (61.5°F) in September, marking an insignificant shift from 17.9°C (64.2°F) in August. Nighttime temperature in Alltwen lowers to an average of 11.3°C (52.3°F) in September.Humidity
The average relative humidity in September is 85%.Rainfall
In Alltwen, in September, it is raining for 12.6 days, with typically 37mm (1.46") of accumulated precipitation. Throughout the year, in Alltwen, there are 181.3 rainfall days, and 568mm (22.36") of precipitation is accumulated.Snowfall
April through November are months without snowfall.Daylight
In Alltwen, United Kingdom, the average length of the day in September is 12h and 38min.On the first day of the month, sunrise is at 6:28 am and sunset at 8:01 pm. On the last day of September, in Alltwen, sunrise is at 7:15 am and sunset at 6:54 pm BST.
Sunshine
In Alltwen, United Kingdom, the average sunshine in September is 6.8h.UV index
The months with the highest UV index in Alltwen 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 unsafe exposure to UV radiation for ordinary individuals.Note: The maximum daily UV index of 4 in September interprets into the following recommendations:
Be vigilant - Suggestions to stave off sun damage are provided. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Frequently asked questions
What is the temperature in September in Alltwen?
What is the average humidity in September in Alltwen?
How many days does it rain in September in Alltwen?
When it does not snow in Alltwen?
What is the average length of the day in September in Alltwen?
When is the sunrise / sunset in September in Alltwen?
How long on average sun shines in September in Alltwen?
When is the highest UV index in Alltwen?
How high is the UV index in September in Alltwen?
Average temperature in September
Alltwen, United Kingdom
- Average high temperature in September: 16.4°C
The warmest month (with the highest average high temperature) is July (18.2°C).
The months with the lowest average high temperature are January and February (7.3°C).
- Average low temperature in September: 11.3°C
The month with the highest average low temperature is August (12.9°C).
The coldest month (with the lowest average low temperature) is February (3.8°C).
Average pressure in September
Alltwen, 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 (1009.8mbar).
Average wind speed in September
Alltwen, United Kingdom
- Average wind speed in September: 16.8km/h
The windiest month (with the highest average wind speed) is December (22.4km/h).
The calmest month (with the lowest average wind speed) is June (14.9km/h).
Average humidity in September
Alltwen, United Kingdom
- Average humidity in September: 85%
The months with the highest relative humidity are January and December (87%).
The month with the lowest relative humidity is April (81%).
Average rainfall in September
Alltwen, United Kingdom
- Average rainfall in September: 37mm
The wettest months (with the highest rainfall) are November and December (66mm).
The driest month (with the least rainfall) is May (31mm).
Average rainfall days in September
Alltwen, United Kingdom
- Average rainfall days in September: 12.6 days
The month with the highest number of rainy days is November (17 days).
The month with the least rainy days is September (12.6 days).
Average snowfall in September
Alltwen, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is January (12mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Alltwen, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (2 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
Alltwen, 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: 8h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in September
Alltwen, United Kingdom
- Average sunshine days in September: 14.4 days
The month with the most sunshine days is September (14.4 days).
The month with the least sunshine days is July (10.3 days).
Average UV index in September
Alltwen, 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
Alltwen, United Kingdom
- Average cloud cover in September: 52
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 47).
Average visibility in September
Alltwen, 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).
Alltwen, United Kingdom
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