September weather forecastHelmdon, United Kingdom
September
Weather in September
September, the first month of the autumn in Helmdon, is also an enjoyable month, with an average temperature fluctuating between 17.7°C (63.9°F) and 9.9°C (49.8°F).Temperature
September's weather records an average high-temperature of an enjoyable 17.7°C (63.9°F), showing little deviation from August. During the month of September, the temperature in Helmdon, United Kingdom, generally drops to a low average of 9.9°C (49.8°F).Humidity
In September, the average relative humidity in Helmdon is 82%.Rainfall
In September, in Helmdon, the rain falls for 9.5 days. Throughout September, 14mm (0.55") of precipitation is accumulated. In Helmdon, during the entire year, the rain falls for 139.2 days and collects up to 210mm (8.27") of precipitation.Snowfall
In Helmdon, snow does not fall in April through November.Daylight
In Helmdon, the average length of the day in September is 12h and 39min.On the first day of September, sunrise is at 6:17 am and sunset at 7:51 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:43 pm BST.
Sunshine
The average sunshine in September is 6.7h.UV index
The months with the highest UV index are May through September, with an average maximum UV index of 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the average person.Note: An average maximum UV index of 4 in September leads to these recommendations:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. To avoid the Sun's strongest rays, limit exposure around the mid-day period. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Helmdon, United Kingdom
- Average high temperature in September: 17.7°C
The warmest month (with the highest average high temperature) is July (20.6°C).
The month with the lowest average high temperature is January (6.1°C).
- Average low temperature in September: 9.9°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 (1.2°C).
Average pressure in September
Helmdon, United Kingdom
- Average pressure in September: 1016.5mbar
The month with the highest atmospheric pressure is May (1016.6mbar).
The month with the lowest atmospheric pressure is November (1010mbar).
Average wind speed in September
Helmdon, United Kingdom
- Average wind speed in September: 13.3km/h
The windiest months (with the highest average wind speed) are February and December (18.5km/h).
The calmest month (with the lowest average wind speed) is July (12.9km/h).
Average humidity in September
Helmdon, United Kingdom
- Average humidity in September: 82%
The month with the highest relative humidity is December (91%).
The month with the lowest relative humidity is August (80%).
Average rainfall in September
Helmdon, United Kingdom
- Average rainfall in September: 14mm
The wettest months (with the highest rainfall) are June and August (25mm).
The driest months (with the least rainfall) are March and April (12mm).
Average rainfall days in September
Helmdon, United Kingdom
- Average rainfall days in September: 9.5 days
The month with the highest number of rainy days is August (14.6 days).
The month with the least rainy days is February (9.1 days).
Average snowfall in September
Helmdon, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is February (10mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Helmdon, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.9 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
Helmdon, 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 42min
The month with the most sunshine is July (Average sunshine: 7h and 18min).
The months with the least sunshine are February and November (Average sunshine: 3h and 42min).
Average sunshine days in September
Helmdon, United Kingdom
- Average sunshine days in September: 16 days
The month with the most sunshine days is March (17.6 days).
The month with the least sunshine days is August (11.6 days).
Average UV index in September
Helmdon, 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
Helmdon, United Kingdom
- Average cloud cover in September: 53
The month with the most cloud cover is November (Cloud cover 65).
The month with the least cloud cover is September (Cloud cover 53).
Average visibility in September
Helmdon, United Kingdom
- Average visibility in September: 8km
The months with the highest visibility are January, February, March, July, August, October and December (9km).
The months with the lowest visibility are April, May, June, September and November (8km).
