September weather forecastCwmann, United Kingdom
September
Weather in September
The first month of the autumn, September, is still a refreshing month in Cwmann, United Kingdom, with an average temperature ranging between max 15.8°C (60.4°F) and min 11.3°C (52.3°F).Temperature
The transition into September marks the average high-temperature at a still refreshing 15.8°C (60.4°F), differing minimally from August's 17.1°C (62.8°F). September notes an average low temperature of 11.3°C (52.3°F), subtly down from the daytime highs.Humidity
The months with the highest humidity in Cwmann are January, August, September and December, with an average relative humidity of 86%.Rainfall
In September, the rain falls for 17.3 days. Throughout September, 59mm (2.32") of precipitation is accumulated. In Cwmann, during the entire year, the rain falls for 227.1 days and collects up to 784mm (30.87") of precipitation.Snowfall
In Cwmann, United Kingdom, snow does not fall in May through November.Daylight
In Cwmann, the average length of the day in September is 12h and 39min.On the first day of September in Cwmann, sunrise is at 6:28 am and sunset at 8:03 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 6:55 pm BST.
Sunshine
In September, the average sunshine in Cwmann is 6.8h.UV index
The months with the highest UV index are May through September, with an average maximum UV index of 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for average individuals.Note: The UV index of 4 during September translates into the following guidance:
Be vigilant - A duty to shield skin and eyes from injury exists. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Cwmann, United Kingdom
- Average high temperature in September: 15.8°C
The warmest month (with the highest average high temperature) is July (17.3°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 (12.6°C).
The coldest month (with the lowest average low temperature) is February (3.8°C).
Average pressure in September
Cwmann, United Kingdom
- Average pressure in September: 1016.3mbar
The month with the highest atmospheric pressure is May (1016.5mbar).
The month with the lowest atmospheric pressure is November (1009.4mbar).
Average wind speed in September
Cwmann, United Kingdom
- Average wind speed in September: 17.5km/h
The windiest month (with the highest average wind speed) is December (23.8km/h).
The calmest month (with the lowest average wind speed) is June (14.8km/h).
Average humidity in September
Cwmann, United Kingdom
- Average humidity in September: 86%
The months with the highest relative humidity are January, August, September and December (86%).
The month with the lowest relative humidity is April (82%).
Average rainfall in September
Cwmann, United Kingdom
- Average rainfall in September: 59mm
The wettest months (with the highest rainfall) are November and December (92mm).
The driest month (with the least rainfall) is May (37mm).
Average rainfall days in September
Cwmann, United Kingdom
- Average rainfall days in September: 17.3 days
The months with the highest number of rainy days are November and December (21.7 days).
The month with the least rainy days is April (15.8 days).
Average snowfall in September
Cwmann, United Kingdom
- Average snowfall in September: 0mm
The months with the highest snowfall are January and December (9mm).
The months with the least snowfall are May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Cwmann, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (1.7 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
Cwmann, United Kingdom
- Average daylight in September: 12h and 42min
The month with the longest days is June (Average daylight: 16h and 42min).
The month with the shortest days is December (Average daylight: 7h and 48min).
- Average sunshine in September: 6h and 48min
The month with the most sunshine is May (Average sunshine: 8h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in September
Cwmann, United Kingdom
- Average sunshine days in September: 9.4 days
The month with the most sunshine days is May (12.9 days).
The month with the least sunshine days is December (5.7 days).
Average UV index in September
Cwmann, 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
Cwmann, United Kingdom
- Average cloud cover in September: 52
The month with the most cloud cover is December (Cloud cover 64).
The months with the least cloud cover are April and May (Cloud cover 48).
Average visibility in September
Cwmann, 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).
