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
As September begins, there is a minor decrease in the average high-temperature, softly falling from a torrid 95.7°F (35.4°C) in August to a hot 87.6°F (30.9°C). Throughout the September nights, Richardson encounters a low-temperature of 70.2°F (21.2°C).Heat index
September's mean heat index is estimated at a fiery hot 95°F (35°C). More safety actions are required, heat exhaustion and heat cramps are probable. Long-term activity may precipitate heatstroke.Heat index evaluations are typically in the context of light winds and shaded environments. Heat index values may surge by up to 15 Fahrenheit (8 Celsius) degrees in the presence of direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is the outcome of merging air's temperature and its humidity metrics. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Children often fail to understand the importance of rest and rehydration. Thirst is a late manifestation of dehydration - hence, it is crucial to stay hydrated, especially during ongoing physical activities.
The innate cooling system of the human body revolves around perspiration, with the evaporation of sweat being central to this process. During high air temperature and humidity (high heat index), the process of perspiration is hindered, intensifying the sensation of heat. Elevated heat gain compared to the body's release capability poses risks of dehydration and potential overheating.
Humidity
In September, the average relative humidity in Richardson is 63%.Rainfall
In Richardson, in September, it is raining for 13.1 days, with typically 1.06" (27mm) of accumulated precipitation. In Richardson, during the entire year, the rain falls for 118.4 days and collects up to 15.51" (394mm) of precipitation.Snowfall
In Richardson, snow does not fall in March through October.Daylight
In September, the average length of the day is 12h and 22min.On the first day of the month, sunrise is at 7:01 am and sunset at 7:51 pm. On the last day of September, sunrise is at 7:20 am and sunset at 7:12 pm CDT.
Sunshine
The average sunshine in September is 8.6h.UV index
In Richardson, the average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for average individuals.Note: A maximum high daily UV index of 6 during September translates into the following directions:
Undertake precautions and comply with sun safety standards. Protection from skin and eye injury is vital. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Frequently asked questions
How hot is September in Richardson?
What is the average humidity in September in Richardson?
How many days does it rain in September in Richardson?
When it does not snow in Richardson?
What is the average length of the day in September in Richardson?
When are sunrise and sunset in September in Richardson?
How long on average sun shines in September in Richardson?
What is the UV index intensity in September in Richardson?
Average temperature in September
Richardson, TX
- Average high temperature in September: 87.6°F
The warmest month (with the highest average high temperature) is August (95.7°F).
The month with the lowest average high temperature is January (54°F).
- Average low temperature in September: 70.2°F
The month with the highest average low temperature is August (76.5°F).
The coldest month (with the lowest average low temperature) is January (38.7°F).
Average pressure in September
Richardson, TX
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Richardson, TX
- Average wind speed in September: 6.7mph
The windiest months (with the highest average wind speed) are March and April (9.9mph).
The calmest month (with the lowest average wind speed) is September (6.7mph).
Average humidity in September
Richardson, TX
- Average humidity in September: 63%
The month with the highest relative humidity is May (73%).
The month with the lowest relative humidity is August (56%).
Average rainfall in September
Richardson, TX
- Average rainfall in September: 1.06"
The wettest month (with the highest rainfall) is May (1.97").
The driest month (with the least rainfall) is February (0.75").
Average rainfall days in September
Richardson, TX
- Average rainfall days in September: 13.1 days
The month with the highest number of rainy days is September (13.1 days).
The month with the least rainy days is January (5.4 days).
Average snowfall in September
Richardson, TX
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.31").
The months with the least snowfall are March, April, May, June, July, August, September and October (0").
Average snowfall days in September
Richardson, TX
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.3 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
Richardson, TX
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is August (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 36min).
Average sunshine days in September
Richardson, TX
- Average sunshine days in September: 14.5 days
The month with the most sunshine days is January (23.7 days).
The month with the least sunshine days is September (14.5 days).
Average UV index in September
Richardson, TX
- Average UV index in September: 6
The months with the highest UV index are May, June, July and August (UV index 7).
The months with the lowest UV index are January and December (UV index 3).
Average cloud cover in September
Richardson, TX
- Average cloud cover in September: 28
The months with the most cloud cover are February and March (Cloud cover 41).
The month with the least cloud cover is August (Cloud cover 20).
Average visibility in September
Richardson, 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).
Richardson, Texas, USA
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