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 to September results in a modest reduction in average high-temperature, moving from 94.5°F (34.7°C) in August to a still hot 86.9°F (30.5°C). September in London is noted for a mean low-temperature of 68.4°F (20.2°C).Heat index
The heat index for September is estimated at a fiery hot 95°F (35°C). Implement additional preventive actions, heat cramps and heat exhaustion are potential hazards. Heatstroke could follow prolonged activity.Keep in mind the heat index values are meant for areas in shade and with light wind. The heat index has the potential to rise by 15 Fahrenheit (8 Celsius) degrees with direct sunshine exposure.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is found by incorporating humidity levels into the air temperature measurement. Additional factors encompassing metabolic differences, the level of physical activity, and clothing can impact the individual's perception of temperature. Keep it in mind, direct sunlight can augment the heat you experience, possibly pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Younglings frequently fail to recognize the requirement to rest and rehydrate. Thirst emerges late in dehydration - it is imperative to keep hydration levels high, particularly during extended physical exertions.
In response to overheating, the human body perspires to cool down, mainly through the evaporation of sweat. Under conditions of high relative humidity, the rate of evaporation decreases. This results in the body retaining more heat than under conditions of dry air. Inadequate heat shedding in the face of rising body temperatures hints at potential dehydration risks.
Humidity
The average relative humidity in September in London, Texas, is 63%.Rainfall
In London, during September, the rain falls for 13.3 days and regularly aggregates up to 1.97" (50mm) of precipitation. In London, Texas, during the entire year, the rain falls for 111.3 days and collects up to 17.13" (435mm) of precipitation.Snowfall
March through November are months without snowfall in London.Daylight
The average length of the day in September in London is 12h and 20min.On the first day of September in London, sunrise is at 7:15 am and sunset at 8:00 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 7:24 pm CDT.
Sunshine
In London, Texas, the average sunshine in September is 8.7h.UV index
The average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for average individuals.Note: A maximum high UV index of 6 in September translates into the following recommendations:
Guard oneself from overexposure. Defence against sun injury is vital. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
Frequently asked questions
How hot is it in London in September?
What is the average humidity in September in London?
How many days does it rain in September in London?
When it does not snow in London?
What is the average length of the day in September in London?
When are sunrise and sunset in September in London?
How many hours of sunshine does London have in September?
What is the UV index reading in September in London?
Average temperature in September
London, TX
- Average high temperature in September: 86.9°F
The warmest months (with the highest average high temperature) are July and August (94.5°F).
The month with the lowest average high temperature is January (59.4°F).
- Average low temperature in September: 68.4°F
The month with the highest average low temperature is August (73.6°F).
The coldest month (with the lowest average low temperature) is January (40.3°F).
Average pressure in September
London, TX
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The months with the lowest atmospheric pressure are May and June (29.89"Hg).
Average wind speed in September
London, TX
- Average wind speed in September: 8.3mph
The windiest month (with the highest average wind speed) is April (12.1mph).
The calmest month (with the lowest average wind speed) is September (8.3mph).
Average humidity in September
London, TX
- Average humidity in September: 63%
The month with the highest relative humidity is May (66%).
The month with the lowest relative humidity is August (53%).
Average rainfall in September
London, TX
- Average rainfall in September: 1.97"
The wettest month (with the highest rainfall) is May (2.52").
The driest month (with the least rainfall) is November (0.63").
Average rainfall days in September
London, TX
- Average rainfall days in September: 13.3 days
The month with the highest number of rainy days is May (13.8 days).
The month with the least rainy days is January (5.4 days).
Average snowfall in September
London, TX
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.24").
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0").
Average snowfall days in September
London, TX
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.9 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
London, TX
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 6min).
The month with the shortest days is December (Average daylight: 10h and 12min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).
Average sunshine days in September
London, TX
- Average sunshine days in September: 14.5 days
The month with the most sunshine days is January (24.6 days).
The month with the least sunshine days is May (14.3 days).
Average UV index in September
London, TX
- Average UV index in September: 6
The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in September
London, TX
- Average cloud cover in September: 30
The months with the most cloud cover are March and May (Cloud cover 35).
The month with the least cloud cover is August (Cloud cover 19).
Average visibility in September
London, TX
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
London, Texas, USA
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