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 sea temperature 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
The introduction of September sees an average high-temperature of a still comfortable 17.3°C (63.1°F), hardly deviating from August. Chepstow records a steady low-temperature average of 10.3°C (50.5°F) during September.Humidity
In Chepstow, the average relative humidity in September is 84%.Rainfall
January, April and September are months with the least rain when the rain falls for 9.5 days and typically aggregates up to 16mm (0.63") of rain.Snowfall
In Chepstow, snow does not fall in April through November.Sea temperature
In Chepstow, the average seawater temperature in September is 16.4°C (61.5°F).Note: Swimming in 16.4°C (61.5°F) is not a pleasurable activity for the majority of people. Breathing becomes increasingly challenging as water temperature descends from 21°C (69.8°F) to 15°C (59°F).
Daylight
In September, the average length of the day in Chepstow is 12h and 38min.On the first day of the month, sunrise is at 6:24 am and sunset at 7:57 pm. On the last day of September, in Chepstow, sunrise is at 7:10 am and sunset at 6:50 pm BST.
Sunshine
The average sunshine in September in Chepstow is 7.1h.UV index
May through September, with an average maximum UV index of 4, are months with the highest UV index. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: The daily high UV index of 4 in September translates into this advice:
Exercise prevention - Protecting skin and eyes from harm is required. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.
Frequently asked questions
What are the temperatures in Chepstow in September?
What is the average humidity in September in Chepstow?
What is the driest month in Chepstow?
How many days does it rain in September in Chepstow?
When it does not snow in Chepstow?
What is the sea water temperature in September in Chepstow?
How many hours of daylight does Chepstow have in September?
What time are sunrise and sunset in September in Chepstow?
How many hours of sunshine does Chepstow have in September?
What are the months with the highest UV index in Chepstow?
How high is the UV index in September in Chepstow?
Average temperature in September
Chepstow, United Kingdom
- Average high temperature in September: 17.3°C
The warmest month (with the highest average high temperature) is July (20°C).
The month with the lowest average high temperature is January (6.9°C).
- Average low temperature in September: 10.3°C
The month with the highest average low temperature is August (12.3°C).
The coldest month (with the lowest average low temperature) is January (2.5°C).
Average pressure in September
Chepstow, 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 (1010mbar).
Average wind speed in September
Chepstow, United Kingdom
- Average wind speed in September: 13.8km/h
The windiest month (with the highest average wind speed) is February (19.1km/h).
The calmest month (with the lowest average wind speed) is July (13.2km/h).
Average humidity in September
Chepstow, United Kingdom
- Average humidity in September: 84%
The month with the highest relative humidity is December (89%).
The months with the lowest relative humidity are May and July (82%).
Average rainfall in September
Chepstow, United Kingdom
- Average rainfall in September: 16mm
The wettest month (with the highest rainfall) is November (33mm).
The driest months (with the least rainfall) are January, April and September (16mm).
Average rainfall days in September
Chepstow, United Kingdom
- Average rainfall days in September: 9.5 days
The month with the highest number of rainy days is August (13.9 days).
The month with the least rainy days is December (9.2 days).
Average snowfall in September
Chepstow, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is February (12mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Chepstow, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in September
Chepstow, United Kingdom
- Average sea temperature in September: 16.4°C
The best month for swimming (with the highest average sea temperature) is August (16.6°C).
The coldest month (with the lowest average sea temperature) is March (8.3°C).
Average daylight in September /
Average sunshine in September
Chepstow, 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 July (Average sunshine: 8h and 0min).
The month with the least sunshine is November (Average sunshine: 3h and 54min).
Average sunshine days in September
Chepstow, United Kingdom
- Average sunshine days in September: 17.1 days
The month with the most sunshine days is December (19.5 days).
The month with the least sunshine days is July (12.8 days).
Average UV index in September
Chepstow, 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
Chepstow, United Kingdom
- Average cloud cover in September: 51
The month with the most cloud cover is November (Cloud cover 61).
The month with the least cloud cover is April (Cloud cover 49).
Average visibility in September
Chepstow, 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).
Chepstow, United Kingdom
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