September weather forecastGrappenhall, United Kingdom
September
Weather in September
September, the first month of the autumn in Grappenhall, is still a refreshing month, with an average temperature fluctuating between 16.9°C (62.4°F) and 10.1°C (50.2°F).Temperature
With the start of September, Grappenhall measures an average high-temperature of a still comfortable 16.9°C (62.4°F), not significantly differing from August's 19.1°C (66.4°F). Grappenhall witnesses a consistent average low-temperature of 10.1°C (50.2°F) throughout September.Humidity
In Grappenhall, the average relative humidity in September is 82%.Rainfall
In Grappenhall, United Kingdom, in September, it is raining for 5.4 days, with typically 8mm (0.31") of accumulated precipitation. In Grappenhall, during the entire year, the rain falls for 87.5 days and collects up to 140mm (5.51") of precipitation.Snowfall
April through November are months without snowfall.Daylight
In September, the average length of the day is 12h and 41min.On the first day of the month, sunrise is at 6:20 am and sunset at 7:59 pm. On the last day of September, sunrise is at 7:11 am and sunset at 6:48 pm BST.
Sunshine
The average sunshine in September in Grappenhall is 6.5h.UV index
The months with the highest UV index in Grappenhall are May through September, with an average maximum UV index of 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for average individuals.Note: In September, the average maximum UV index of 4 translates into the following recommendations:
Undertake precautions - It is suggested to shield oneself from sunburn. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Grappenhall, United Kingdom
- Average high temperature in September: 16.9°C
The warmest month (with the highest average high temperature) is July (19.5°C).
The month with the lowest average high temperature is January (6.3°C).
- Average low temperature in September: 10.1°C
The month with the highest average low temperature is August (12.1°C).
The coldest month (with the lowest average low temperature) is February (2°C).
Average pressure in September
Grappenhall, United Kingdom
- Average pressure in September: 1015.6mbar
The month with the highest atmospheric pressure is May (1016.2mbar).
The month with the lowest atmospheric pressure is November (1009mbar).
Average wind speed in September
Grappenhall, United Kingdom
- Average wind speed in September: 13.1km/h
The windiest month (with the highest average wind speed) is February (17.4km/h).
The calmest month (with the lowest average wind speed) is June (12.1km/h).
Average humidity in September
Grappenhall, United Kingdom
- Average humidity in September: 82%
The months with the highest relative humidity are January and December (88%).
The month with the lowest relative humidity is May (78%).
Average rainfall in September
Grappenhall, United Kingdom
- Average rainfall in September: 8mm
The wettest month (with the highest rainfall) is June (19mm).
The driest month (with the least rainfall) is May (6mm).
Average rainfall days in September
Grappenhall, United Kingdom
- Average rainfall days in September: 5.4 days
The month with the highest number of rainy days is July (10.1 days).
The month with the least rainy days is September (5.4 days).
Average snowfall in September
Grappenhall, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is January (9mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Grappenhall, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (1.8 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Grappenhall, United Kingdom
- Average daylight in September: 12h and 42min
The month with the longest days is June (Average daylight: 16h and 54min).
The month with the shortest days is December (Average daylight: 7h and 36min).
- Average sunshine in September: 6h and 30min
The months with the most sunshine are April and May (Average sunshine: 7h and 24min).
The month with the least sunshine is February (Average sunshine: 3h and 48min).
Average sunshine days in September
Grappenhall, United Kingdom
- Average sunshine days in September: 20.2 days
The month with the most sunshine days is March (21.8 days).
The month with the least sunshine days is July (17 days).
Average UV index in September
Grappenhall, 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
Grappenhall, United Kingdom
- Average cloud cover in September: 55
The months with the most cloud cover are January and December (Cloud cover 62).
The month with the least cloud cover is April (Cloud cover 50).
Average visibility in September
Grappenhall, 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).
