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
In the transition from August to September, Leiston reports an average high-temperature of a still comfortable 17.6°C (63.7°F), indicating a close resemblance to the prior month. The September nights in Leiston, United Kingdom, show a slight decrease to a mean low-temperature of 14.2°C (57.6°F).Humidity
August and September, with an average relative humidity of 77%, are the least humid months.Rainfall
In September, the rain falls for 13.9 days. Throughout September, 34mm (1.34") of precipitation is accumulated. Throughout the year, there are 188.4 rainfall days, and 486mm (19.13") of precipitation is accumulated.Snowfall
April through October are months without snowfall.Daylight
In September, the average length of the day in Leiston is 12h and 39min.On the first day of the month, sunrise is at 6:06 am and sunset at 7:40 pm. On the last day of September, in Leiston, sunrise is at 6:53 am and sunset at 6:33 pm BST.
Sunshine
The average sunshine in September is 8.1h.UV index
The average daily maximum UV index in September in Leiston is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the ordinary person.Note: The UV index of 4 in September translates into these instructions:
Ensure safety - Recommendations to avert sunburn are presented. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Stay sun-safe with clothing that is both closely woven and worn loosely.
Frequently asked questions
What is the usual temperature for Leiston in September?
What is the least humid month in Leiston?
What is the average humidity in September in Leiston?
How many days does it rain in September in Leiston?
When it does not snow in Leiston?
What is the average length of the day in September in Leiston?
When are sunrise and sunset in September in Leiston?
How many hours of sunshine does Leiston have in September?
What is the UV index reading in September in Leiston?
Average temperature in September
Leiston, United Kingdom
- Average high temperature in September: 17.6°C
The warmest month (with the highest average high temperature) is August (19.7°C).
The months with the lowest average high temperature are January and February (7.1°C).
- Average low temperature in September: 14.2°C
The month with the highest average low temperature is August (15.8°C).
The coldest month (with the lowest average low temperature) is February (4.3°C).
Average pressure in September
Leiston, United Kingdom
- Average pressure in September: 1016.6mbar
The month with the highest atmospheric pressure is May (1016.7mbar).
The month with the lowest atmospheric pressure is November (1010.4mbar).
Average wind speed in September
Leiston, United Kingdom
- Average wind speed in September: 20.4km/h
The windiest month (with the highest average wind speed) is December (27.7km/h).
The calmest month (with the lowest average wind speed) is July (17.7km/h).
Average humidity in September
Leiston, United Kingdom
- Average humidity in September: 77%
The months with the highest relative humidity are January, June and December (83%).
The months with the lowest relative humidity are August and September (77%).
Average rainfall in September
Leiston, United Kingdom
- Average rainfall in September: 34mm
The wettest month (with the highest rainfall) is July (57mm).
The driest month (with the least rainfall) is April (21mm).
Average rainfall days in September
Leiston, United Kingdom
- Average rainfall days in September: 13.9 days
The month with the highest number of rainy days is July (19.1 days).
The month with the least rainy days is February (12.3 days).
Average snowfall in September
Leiston, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is January (21mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Leiston, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (2.9 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
Leiston, United Kingdom
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 42min).
The month with the shortest days is December (Average daylight: 7h and 48min).
- Average sunshine in September: 8h and 1min
The month with the most sunshine is August (Average sunshine: 9h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 0min).
Average sunshine days in September
Leiston, United Kingdom
- Average sunshine days in September: 11.9 days
The months with the most sunshine days are April and May (14 days).
The month with the least sunshine days is November (8 days).
Average UV index in September
Leiston, 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
Leiston, United Kingdom
- Average cloud cover in September: 41
The months with the most cloud cover are January and February (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 40).
Average visibility in September
Leiston, 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).
Leiston, United Kingdom
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