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 transition into September reveals an average high-temperature of an enjoyable 18.5°C (65.3°F), mirroring a close resemblance to August. Chelmsford's average low-temperature is measured at a fresh 11.6°C (52.9°F) during September.Humidity
In September, the average relative humidity is 77%.Rainfall
In September, in Chelmsford, the rain falls for 10.5 days. Throughout September, 21mm (0.83") of precipitation is accumulated. In Chelmsford, during the entire year, the rain falls for 156 days and collects up to 361mm (14.21") of precipitation.Snowfall
In Chelmsford, snow does not fall in April through October.Daylight
In September, the average length of the day in Chelmsford is 12h and 38min.On the first day of the month, sunrise is at 6:11 am and sunset at 7:44 pm. On the last day of September, in Chelmsford, sunrise is at 6:58 am and sunset at 6:37 pm BST.
Sunshine
In September, the average sunshine is 7.4h.UV index
The average daily maximum UV index in September in Chelmsford is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: During September, 4 as the daily maximum UV index converts into the following advice:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. It's recommended to limit sun exposure when its radiation is at its peak during midday. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Frequently asked questions
What is the usual temperature for Chelmsford in September?
What is the average humidity in September in Chelmsford?
How many days does it rain in September in Chelmsford?
When it does not snow in Chelmsford?
How many hours of daylight does Chelmsford have in September?
When are sunrise and sunset in September in Chelmsford?
How many hours of sunshine does Chelmsford have in September?
How high is the UV index in September in Chelmsford?
Average temperature in September
Chelmsford, United Kingdom
- Average high temperature in September: 18.5°C
The warmest month (with the highest average high temperature) is July (21.5°C).
The month with the lowest average high temperature is January (6.3°C).
- Average low temperature in September: 11.6°C
The month with the highest average low temperature is August (13.8°C).
The coldest month (with the lowest average low temperature) is January (2.2°C).
Average pressure in September
Chelmsford, United Kingdom
- Average pressure in September: 1016.8mbar
The months with the highest atmospheric pressure are May and September (1016.8mbar).
The month with the lowest atmospheric pressure is November (1010.6mbar).
Average wind speed in September
Chelmsford, United Kingdom
- Average wind speed in September: 13.5km/h
The windiest month (with the highest average wind speed) is February (18.7km/h).
The calmest month (with the lowest average wind speed) is July (13.1km/h).
Average humidity in September
Chelmsford, United Kingdom
- Average humidity in September: 77%
The month with the highest relative humidity is December (89%).
The month with the lowest relative humidity is August (74%).
Average rainfall in September
Chelmsford, United Kingdom
- Average rainfall in September: 21mm
The wettest month (with the highest rainfall) is December (42mm).
The driest month (with the least rainfall) is April (19mm).
Average rainfall days in September
Chelmsford, United Kingdom
- Average rainfall days in September: 10.5 days
The month with the highest number of rainy days is July (15.2 days).
The month with the least rainy days is September (10.5 days).
Average snowfall in September
Chelmsford, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is February (28mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Chelmsford, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (4 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
Chelmsford, 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 2min
The month with the most sunshine is August (Average sunshine: 8h and 18min).
The month with the least sunshine is February (Average sunshine: 3h and 36min).
Average sunshine days in September
Chelmsford, United Kingdom
- Average sunshine days in September: 16.8 days
The month with the most sunshine days is September (16.8 days).
The month with the least sunshine days is February (11.6 days).
Average UV index in September
Chelmsford, 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
Chelmsford, United Kingdom
- Average cloud cover in September: 46
The month with the most cloud cover is February (Cloud cover 61).
The months with the least cloud cover are August and September (Cloud cover 46).
Average visibility in September
Chelmsford, 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).
Chelmsford, United Kingdom
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