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 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
The onset of September brings with it an average high-temperature of a comfortable 18.8°C (65.8°F), showing a negligible variation from the month before. In September, the temperature drops to an average of 11.2°C (52.2°F) at night.Humidity
The average relative humidity in September in Elstree, United Kingdom, is 77%.Rainfall
In Elstree, United Kingdom, during September, the rain falls for 11.8 days and regularly aggregates up to 23mm (0.91") of precipitation. In Elstree, during the entire year, the rain falls for 165.8 days and collects up to 345mm (13.58") of precipitation.Snowfall
In Elstree, snow does not fall in April through October.Daylight
In Elstree, United Kingdom, the average length of the day in September is 12h and 38min.On the first day of September, sunrise is at 6:14 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 6:40 pm BST.
Sunshine
In September, the average sunshine is 7.1h.UV index
In Elstree, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.Note: The UV index of 4 during September translates into the following guidance:
Take precautions. Light skin individuals may get burned in less than 30 minutes. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Stay sun-safe with clothing that is both closely woven and worn loosely.
Frequently asked questions
What is the temperature in September in Elstree?
What is the average humidity in September in Elstree?
How many days does it rain in September in Elstree?
When it does not snow in Elstree?
How many hours of daylight does Elstree have in September?
When is the sunrise / sunset in September in Elstree?
How long on average sun shines in September in Elstree?
How high is the UV index in September in Elstree?
Average temperature in September
Elstree, United Kingdom
- Average high temperature in September: 18.8°C
The warmest month (with the highest average high temperature) is July (21.8°C).
The month with the lowest average high temperature is January (6.7°C).
- Average low temperature in September: 11.2°C
The month with the highest average low temperature is August (13.7°C).
The coldest month (with the lowest average low temperature) is January (1.9°C).
Average pressure in September
Elstree, United Kingdom
- Average pressure in September: 1016.9mbar
The month with the highest atmospheric pressure is September (1016.9mbar).
The month with the lowest atmospheric pressure is November (1010.5mbar).
Average wind speed in September
Elstree, United Kingdom
- Average wind speed in September: 12.8km/h
The windiest month (with the highest average wind speed) is February (17.6km/h).
The calmest month (with the lowest average wind speed) is July (12.7km/h).
Average humidity in September
Elstree, United Kingdom
- Average humidity in September: 77%
The month with the highest relative humidity is December (89%).
The months with the lowest relative humidity are July and August (74%).
Average rainfall in September
Elstree, United Kingdom
- Average rainfall in September: 23mm
The wettest month (with the highest rainfall) is June (46mm).
The driest month (with the least rainfall) is January (19mm).
Average rainfall days in September
Elstree, United Kingdom
- Average rainfall days in September: 11.8 days
The month with the highest number of rainy days is July (18.4 days).
The month with the least rainy days is February (10.8 days).
Average snowfall in September
Elstree, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is February (16mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Elstree, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.1 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
Elstree, United Kingdom
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 36min).
The month with the shortest days is December (Average daylight: 7h and 54min).
- Average sunshine in September: 7h and 1min
The months with the most sunshine are July and August (Average sunshine: 8h and 0min).
The month with the least sunshine is February (Average sunshine: 3h and 42min).
Average sunshine days in September
Elstree, United Kingdom
- Average sunshine days in September: 14.1 days
The month with the most sunshine days is December (16.3 days).
The month with the least sunshine days is July (9.3 days).
Average UV index in September
Elstree, 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, February, November and December (UV index 2).
Average cloud cover in September
Elstree, United Kingdom
- Average cloud cover in September: 49
The month with the most cloud cover is February (Cloud cover 61).
The months with the least cloud cover are April and September (Cloud cover 49).
Average visibility in September
Elstree, United Kingdom
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October and December (9km).
The month with the lowest visibility is November (8km).
Elstree, United Kingdom
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