September weather forecastBarnstaple, United Kingdom
September
Weather in September
September brings the commencement of autumn in Barnstaple, marking a mild transition from the heat of August. The atmosphere tends to cool down, albeit gradually preserving the warm traces of summer. While cooler evenings hint at the forthcoming autumn, long daylight hours ensure the continuation of outdoor activities. The sea temperature slightly declines to 16.9°C (62.4°F), inviting for refreshing swims or shoreline walks. During this month, Barnstaple starts to hint at the changing season without sacrificing much of the balmy weather.Temperature
The commencement of September introduces an average high-temperature of a still refreshing 16.8°C (62.2°F), closely mirroring the preceding month. Throughout September, Barnstaple witnesses a nighttime temperature average of 11.2°C (52.2°F).Humidity
The average relative humidity in September is 84%.Rainfall
In Barnstaple, United Kingdom, in September, it is raining for 14.7 days, with typically 37mm (1.46") of accumulated precipitation. In Barnstaple, during the entire year, the rain falls for 196.4 days and collects up to 566mm (22.28") of precipitation.Snowfall
In Barnstaple, snow does not fall in April through November.Sea temperature
In Barnstaple, in September, the average water temperature is 16.9°C (62.4°F).Note: In water with a temperature of 16.9°C (62.4°F), most individuals do not find swimming enjoyable. As the temperature falls from 21°C (69.8°F) to 15°C (59°F), breathing control becomes more difficult.
Daylight
The average length of the day in September in Barnstaple is 12h and 38min.On the first day of the month, sunrise is at 6:30 am and sunset at 8:01 pm. On the last day of September, in Barnstaple, United Kingdom, sunrise is at 7:16 am and sunset at 6:56 pm BST.
Sunshine
The average sunshine in September is 6.8h.UV index
May through September, with an average maximum UV index of 4, are months with the highest UV index in Barnstaple, United Kingdom. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: A daily maximum UV index of 4 in September translates into the following instructions:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. To protect against the Sun's most potent rays, avoid direct exposure around midday. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Barnstaple, United Kingdom
- Average high temperature in September: 16.8°C
The warmest month (with the highest average high temperature) is July (18.8°C).
The month with the lowest average high temperature is February (7.8°C).
- Average low temperature in September: 11.2°C
The month with the highest average low temperature is August (12.8°C).
The coldest month (with the lowest average low temperature) is February (3.9°C).
Average pressure in September
Barnstaple, United Kingdom
- Average pressure in September: 1017mbar
The month with the highest atmospheric pressure is September (1017mbar).
The month with the lowest atmospheric pressure is November (1010mbar).
Average wind speed in September
Barnstaple, United Kingdom
- Average wind speed in September: 16.8km/h
The windiest month (with the highest average wind speed) is December (23km/h).
The calmest months (with the lowest average wind speed) are June and July (15.3km/h).
Average humidity in September
Barnstaple, United Kingdom
- Average humidity in September: 84%
The months with the highest relative humidity are January, October, November and December (86%).
The months with the lowest relative humidity are April and May (82%).
Average rainfall in September
Barnstaple, United Kingdom
- Average rainfall in September: 37mm
The wettest month (with the highest rainfall) is December (72mm).
The driest month (with the least rainfall) is May (29mm).
Average rainfall days in September
Barnstaple, United Kingdom
- Average rainfall days in September: 14.7 days
The month with the highest number of rainy days is November (19.3 days).
The month with the least rainy days is March (14.2 days).
Average snowfall in September
Barnstaple, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is January (19mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Barnstaple, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.8 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average sea temperature in September
Barnstaple, United Kingdom
- Average sea temperature in September: 16.9°C
The best month for swimming (with the highest average sea temperature) is August (17.2°C).
The coldest month (with the lowest average sea temperature) is March (8.3°C).
Average daylight in September /
Average sunshine in September
Barnstaple, United Kingdom
- Average daylight in September: 12h and 36min
The month with the longest days is June (Average daylight: 16h and 30min).
The month with the shortest days is December (Average daylight: 8h and 0min).
- Average sunshine in September: 6h and 48min
The month with the most sunshine is May (Average sunshine: 7h and 48min).
The month with the least sunshine is November (Average sunshine: 3h and 30min).
Average sunshine days in September
Barnstaple, United Kingdom
- Average sunshine days in September: 12.7 days
The month with the most sunshine days is March (13.6 days).
The month with the least sunshine days is November (7.6 days).
Average UV index in September
Barnstaple, 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
Barnstaple, United Kingdom
- Average cloud cover in September: 54
The month with the most cloud cover is November (Cloud cover 65).
The months with the least cloud cover are April and May (Cloud cover 49).
Average visibility in September
Barnstaple, 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).
