September weather forecastGuildford, United Kingdom
September
Weather in September
The first month of the autumn, September, is also an enjoyable month in Guildford, United Kingdom, with an average temperature varying between 10.8°C (51.4°F) and 18.6°C (65.5°F).Temperature
With September's arrival, Guildford's weather records an average high-temperature of a refreshing 18.6°C (65.5°F), marking little difference from August's 21°C (69.8°F). Guildford experiences an average low-temperature reading of 10.8°C (51.4°F) throughout September.Humidity
The average relative humidity in September in Guildford is 79%.Rainfall
In Guildford, during September, the rain falls for 13.4 days and regularly aggregates up to 33mm (1.3") of precipitation. Throughout the year, there are 192.1 rainfall days, and 499mm (19.65") of precipitation is accumulated.Snowfall
April through October are months without snowfall in Guildford.Daylight
In September, the average length of the day is 12h and 38min.On the first day of September, sunrise is at 6:16 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 6:42 pm BST.
Sunshine
In September, the average sunshine in Guildford, United Kingdom, is 7.4h.UV index
In September, the average daily maximum UV index in Guildford is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 4 during September translates into the following directions:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Guildford, United Kingdom
- Average high temperature in September: 18.6°C
The warmest month (with the highest average high temperature) is July (21.4°C).
The month with the lowest average high temperature is January (7°C).
- Average low temperature in September: 10.8°C
The month with the highest average low temperature is August (13.1°C).
The coldest month (with the lowest average low temperature) is January (2.2°C).
Average pressure in September
Guildford, 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 (1010.7mbar).
Average wind speed in September
Guildford, United Kingdom
- Average wind speed in September: 13.1km/h
The windiest month (with the highest average wind speed) is February (17.8km/h).
The calmest month (with the lowest average wind speed) is July (12.8km/h).
Average humidity in September
Guildford, United Kingdom
- Average humidity in September: 79%
The month with the highest relative humidity is December (89%).
The month with the lowest relative humidity is July (77%).
Average rainfall in September
Guildford, United Kingdom
- Average rainfall in September: 33mm
The wettest month (with the highest rainfall) is June (56mm).
The driest month (with the least rainfall) is April (25mm).
Average rainfall days in September
Guildford, United Kingdom
- Average rainfall days in September: 13.4 days
The month with the highest number of rainy days is July (20.1 days).
The months with the least rainy days are March and September (13.4 days).
Average snowfall in September
Guildford, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is February (19mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Guildford, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.6 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
Guildford, 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: 7h and 24min
The month with the most sunshine is July (Average sunshine: 8h and 24min).
The month with the least sunshine is February (Average sunshine: 3h and 48min).
Average sunshine days in September
Guildford, United Kingdom
- Average sunshine days in September: 12.5 days
The month with the most sunshine days is March (14.1 days).
The month with the least sunshine days is August (7.3 days).
Average UV index in September
Guildford, United Kingdom
- Average UV index in September: 4
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Guildford, United Kingdom
- Average cloud cover in September: 47
The months with the most cloud cover are February and November (Cloud cover 60).
The months with the least cloud cover are April and September (Cloud cover 47).
Average visibility in September
Guildford, United Kingdom
- Average visibility in September: 9km
The months with the highest visibility are February, March, April, May, June, July, August, September and October (9km).
The months with the lowest visibility are January, November and December (8km).
