Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
September's climate shows a minor adjustment in average high-temperatures to a still comfortable 17.7°C (63.9°F) from August's 18.9°C (66°F). Sandown notes an average temperature descent to a still refreshing 13.3°C (55.9°F) in September, a small shift from its daytime peak.Humidity
With an average relative humidity of 79%, September is the least humid month.Rainfall
In September, in Sandown, the rain falls for 12.5 days. Throughout September, 30mm (1.18") of precipitation is accumulated. In Sandown, during the entire year, the rain falls for 182.5 days and collects up to 469mm (18.46") of precipitation.Snowfall
In Sandown, snow does not fall in April through October.Sea temperature
The month with the warmest seawater in Sandown is September, with an average sea temperature of 17.3°C (63.1°F).Note: Swimming is not a pleasurable activity for most people when the water temperature is 17.3°C (63.1°F). Breathing control gets harder as the water temperature drops from 21°C (69.8°F) to 15°C (59°F).
Daylight
The average length of the day in September in Sandown, United Kingdom, is 12h and 37min.On the first day of the month, sunrise is at 6:19 am and sunset at 7:49 pm. On the last day of September, sunrise is at 7:04 am and sunset at 6:44 pm BST.
Sunshine
The average sunshine in September is 8.3h.UV index
The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: The UV index of 4 during September leads to these advisories:
Exercise prevention - Protecting skin and eyes from harm is required. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Employ a wide-brim hat for potent defense against up to 50% of UV rays.
Frequently asked questions
What is the usual temperature for Sandown in September?
What is the least humid month in Sandown?
What is the average humidity in September in Sandown?
How much does it rain in Sandown in September?
When it does not snow in Sandown?
When is the sea warmest in Sandown?
How cold is the water in September in Sandown?
How many hours of daylight does Sandown have in September?
When is the sunrise / sunset in September in Sandown?
How long on average sun shines in September in Sandown?
How high is the UV index in September in Sandown?
Average temperature in September
Sandown, United Kingdom
- Average high temperature in September: 17.7°C
The warmest month (with the highest average high temperature) is August (18.9°C).
The month with the lowest average high temperature is February (8°C).
- Average low temperature in September: 13.3°C
The month with the highest average low temperature is August (14.9°C).
The coldest month (with the lowest average low temperature) is February (4.8°C).
Average pressure in September
Sandown, United Kingdom
- Average pressure in September: 1017.3mbar
The month with the highest atmospheric pressure is September (1017.3mbar).
The month with the lowest atmospheric pressure is November (1010.8mbar).
Average wind speed in September
Sandown, United Kingdom
- Average wind speed in September: 20km/h
The windiest month (with the highest average wind speed) is December (26.2km/h).
The calmest month (with the lowest average wind speed) is July (17.6km/h).
Average humidity in September
Sandown, United Kingdom
- Average humidity in September: 79%
The months with the highest relative humidity are January, February and December (83%).
The month with the lowest relative humidity is September (79%).
Average rainfall in September
Sandown, United Kingdom
- Average rainfall in September: 30mm
The wettest month (with the highest rainfall) is November (63mm).
The driest months (with the least rainfall) are April and May (24mm).
Average rainfall days in September
Sandown, United Kingdom
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is November (19.8 days).
The month with the least rainy days is September (12.5 days).
Average snowfall in September
Sandown, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is November (7mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Sandown, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.7 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average sea temperature in September
Sandown, United Kingdom
- Average sea temperature in September: 17.3°C
The best month for swimming (with the highest average sea temperature) is September (17.3°C).
The coldest month (with the lowest average sea temperature) is March (8.6°C).
Average daylight in September /
Average sunshine in September
Sandown, United Kingdom
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 24min).
The month with the shortest days is December (Average daylight: 8h and 6min).
- Average sunshine in September: 8h and 2min
The month with the most sunshine is July (Average sunshine: 9h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 6min).
Average sunshine days in September
Sandown, United Kingdom
- Average sunshine days in September: 13.5 days
The month with the most sunshine days is April (15 days).
The month with the least sunshine days is November (6.7 days).
Average UV index in September
Sandown, United Kingdom
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January and February (UV index 2).
Average cloud cover in September
Sandown, United Kingdom
- Average cloud cover in September: 41
The month with the most cloud cover is November (Cloud cover 58).
The month with the least cloud cover is July (Cloud cover 39).
Average visibility in September
Sandown, United Kingdom
- Average visibility in September: 10km
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (10km).
The month with the lowest visibility is January (9km).
Sandown, United Kingdom
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