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
September
Weather in September
Temperature
Harrow Weald marks the start of September with an average high-temperature of an enjoyable 18.8°C (65.8°F), hinting at a slight fluctuation from August's 21.6°C (70.9°F). Throughout September, the average low-temperature records at a cool 11.2°C (52.2°F).Humidity
In Harrow Weald, United Kingdom, the average relative humidity in September is 77%.Rainfall
In Harrow Weald, in September, during 11.8 rainfall days, 23mm (0.91") of precipitation is typically accumulated. Throughout the year, in Harrow Weald, United Kingdom, there are 165.8 rainfall days, and 345mm (13.58") of precipitation is accumulated.Snowfall
In Harrow Weald, snow does not fall in April through October.Daylight
In September, the average length of the day in Harrow Weald is 12h and 38min.On the first day of September in Harrow Weald, 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 Harrow Weald, the average sunshine in September is 7.1h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for average individuals.Note: The maximum daily UV index, 4 in September, converts into the following recommendations:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September in Harrow Weald?
What is the average humidity in September in Harrow Weald?
How much does it rain in Harrow Weald in September?
When it does not snow in Harrow Weald?
What is the average length of the day in September in Harrow Weald?
What time are sunrise and sunset in September in Harrow Weald?
How long on average sun shines in September in Harrow Weald?
What is the UV index intensity in September in Harrow Weald?
Average temperature in September
Harrow Weald, 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
Harrow Weald, 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
Harrow Weald, 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
Harrow Weald, 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
Harrow Weald, 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
Harrow Weald, 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
Harrow Weald, 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
Harrow Weald, 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
Harrow Weald, 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
Harrow Weald, 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
Harrow Weald, 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
Harrow Weald, 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
Harrow Weald, 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).
