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
Letchworth Garden City, United Kingdom, starts September with an average high-temperature of a refreshing 18.4°C (65.1°F), a minor shift from August's 20.9°C (69.6°F). In Letchworth Garden City, the average nighttime temperature during September is a cool 10.7°C (51.3°F).Humidity
The average relative humidity in September is 79%.Rainfall
The month with the least rainfall in Letchworth Garden City is September, when the rain falls for 10.9 days and typically collects 19mm (0.75") of precipitation.Snowfall
In Letchworth Garden City, snow does not fall in May through October.Daylight
In Letchworth Garden City, the average length of the day in September is 12h and 39min.On the first day of the month, sunrise is at 6:13 am and sunset at 7:47 pm. On the last day of September, sunrise is at 7:01 am and sunset at 6:40 pm BST.
Sunshine
In Letchworth Garden City, the average sunshine in September is 7h.UV index
In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: In September, a daily UV index of 4 turns into the following recommendations:
Take care. Persons with lighter skin might suffer burns in less than 30 minutes. The Sun's radiation is especially intense around midday; try to stay in shade during this period. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Frequently asked questions
What are the temperatures in Letchworth Garden City in September?
What is the average humidity in September in Letchworth Garden City?
What is the driest month in Letchworth Garden City?
How much does it rain in Letchworth Garden City in September?
When it does not snow in Letchworth Garden City?
What is the average length of the day in September in Letchworth Garden City?
When are sunrise and sunset in September in Letchworth Garden City?
How long on average sun shines in September in Letchworth Garden City?
What is the UV index intensity in September in Letchworth Garden City?
Average temperature in September
Letchworth Garden City, United Kingdom
- Average high temperature in September: 18.4°C
The warmest month (with the highest average high temperature) is July (21.3°C).
The month with the lowest average high temperature is January (6.3°C).
- Average low temperature in September: 10.7°C
The month with the highest average low temperature is August (13.2°C).
The coldest month (with the lowest average low temperature) is January (1.6°C).
Average pressure in September
Letchworth Garden City, United Kingdom
- Average pressure in September: 1016.7mbar
The months with the highest atmospheric pressure are May and September (1016.7mbar).
The month with the lowest atmospheric pressure is November (1010.3mbar).
Average wind speed in September
Letchworth Garden City, United Kingdom
- Average wind speed in September: 13.3km/h
The windiest months (with the highest average wind speed) are February and December (18.4km/h).
The calmest month (with the lowest average wind speed) is July (12.9km/h).
Average humidity in September
Letchworth Garden City, United Kingdom
- Average humidity in September: 79%
The month with the highest relative humidity is December (90%).
The month with the lowest relative humidity is August (77%).
Average rainfall in September
Letchworth Garden City, United Kingdom
- Average rainfall in September: 19mm
The wettest month (with the highest rainfall) is June (43mm).
The driest month (with the least rainfall) is September (19mm).
Average rainfall days in September
Letchworth Garden City, United Kingdom
- Average rainfall days in September: 10.9 days
The month with the highest number of rainy days is July (16.8 days).
The month with the least rainy days is February (10.8 days).
Average snowfall in September
Letchworth Garden City, United Kingdom
- Average snowfall in September: 0mm
The month with the highest snowfall is February (29mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Letchworth Garden City, United Kingdom
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.6 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
Letchworth Garden City, 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 48min).
- Average sunshine in September: 7h and 0min
The months with the most sunshine are July and August (Average sunshine: 7h and 48min).
The month with the least sunshine is February (Average sunshine: 3h and 42min).
Average sunshine days in September
Letchworth Garden City, United Kingdom
- Average sunshine days in September: 15 days
The month with the most sunshine days is March (15.1 days).
The month with the least sunshine days is July (9.7 days).
Average UV index in September
Letchworth Garden City, United Kingdom
- Average UV index in September: 4
The month with the highest UV index is 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
Letchworth Garden City, United Kingdom
- Average cloud cover in September: 49
The months with the most cloud cover are February and November (Cloud cover 61).
The month with the least cloud cover is September (Cloud cover 49).
Average visibility in September
Letchworth Garden City, 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).
Letchworth Garden City, United Kingdom
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