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 shows a subtle variation to a still refreshing 15.8°C (60.4°F) from August's 17°C (62.6°F) in the average high-temperature. The nighttime temperature demonstrates a marginal decline, averaging at a still refreshing 13.4°C (56.1°F) during September.Humidity
The average relative humidity in September is 82%.Rainfall
In Letterston, in September, during 17.8 rainfall days, 59mm (2.32") of precipitation is typically accumulated. Throughout the year, there are 225.4 rainfall days, and 791mm (31.14") of precipitation is accumulated.Snowfall
April through October are months without snowfall.Daylight
In Letterston, the average length of the day in September is 12h and 39min.On the first day of the month, sunrise is at 6:32 am and sunset at 8:06 pm. On the last day of September, sunrise is at 7:20 am and sunset at 6:59 pm BST.
Sunshine
In Letterston, the average sunshine in September is 7.2h.UV index
May through October, with an average maximum UV index of 4, are months with the highest UV index. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: The UV index of 4 during September translates into the following guidance:
Adopt protective measures - It is advised to guard against sun damage. The solar radiation around mid-day is intense; avoid the Sun and stay safe. Opt for tightly woven and loose clothing to enhance protection from the Sun.
Frequently asked questions
What are the temperatures in Letterston in September?
What is the average humidity in September in Letterston?
How much does it rain in Letterston in September?
When it does not snow in Letterston?
What is the average length of the day in September in Letterston?
When are sunrise and sunset in September in Letterston?
How long on average sun shines in September in Letterston?
What is the month with the highest UV index in Letterston?
What is the UV index reading in September in Letterston?
Average temperature in September
Letterston, United Kingdom
- Average high temperature in September: 15.8°C
The warmest month (with the highest average high temperature) is August (17°C).
The month with the lowest average high temperature is February (8.3°C).
- Average low temperature in September: 13.4°C
The month with the highest average low temperature is August (14.7°C).
The coldest month (with the lowest average low temperature) is February (5.8°C).
Average pressure in September
Letterston, United Kingdom
- Average pressure in September: 1016.5mbar
The month with the highest atmospheric pressure is May (1016.6mbar).
The month with the lowest atmospheric pressure is November (1009.4mbar).
Average wind speed in September
Letterston, United Kingdom
- Average wind speed in September: 23.1km/h
The windiest month (with the highest average wind speed) is December (30.8km/h).
The calmest month (with the lowest average wind speed) is June (18.8km/h).
Average humidity in September
Letterston, United Kingdom
- Average humidity in September: 82%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is November (80%).
Average rainfall in September
Letterston, United Kingdom
- Average rainfall in September: 59mm
The wettest month (with the highest rainfall) is November (108mm).
The driest month (with the least rainfall) is May (34mm).
Average rainfall days in September
Letterston, United Kingdom
- Average rainfall days in September: 17.8 days
The month with the highest number of rainy days is November (23.2 days).
The month with the least rainy days is May (14.8 days).
Average snowfall in September
Letterston, United Kingdom
- Average snowfall in September: 0mm
The months with the highest snowfall are January and February (6mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Letterston, United Kingdom
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (0.8 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Letterston, 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 month with the most sunshine is May (Average sunshine: 8h and 30min).
The month with the least sunshine is December (Average sunshine: 3h and 42min).
Average sunshine days in September
Letterston, United Kingdom
- Average sunshine days in September: 9.5 days
The month with the most sunshine days is May (13.7 days).
The months with the least sunshine days are November and December (4.5 days).
Average UV index in September
Letterston, United Kingdom
- Average UV index in September: 4
The months with the highest UV index are May, June, July, August, September and October (UV index 4).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in September
Letterston, United Kingdom
- Average cloud cover in September: 50
The months with the most cloud cover are November and December (Cloud cover 63).
The month with the least cloud cover is May (Cloud cover 45).
Average visibility in September
Letterston, United Kingdom
- Average visibility in September: 10km
The months with the highest visibility are February, March, May, June, July, August, September and October (10km).
The months with the lowest visibility are January, April, November and December (9km).
Letterston, United Kingdom
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