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
During the shift to September, Katy records a mild decrease in average high-temperature, moving from 94.6°F (34.8°C) in August to a still hot 88.7°F (31.5°C). Katy, in the month of September, anticipates a consistent average low-temperature of 71.8°F (22.1°C).Heat index
September's heat index is calculated to be a blisteringly hot 105.8°F (41°C). Adopt additional preventive measures, heat cramps and heat exhaustion are potential outcomes. Prolonged activity may trigger heatstroke.In the scope of the heat index, its values resonate with shade and light wind conditions. Direct sunlight exposure may cause a 15 Fahrenheit (8 Celsius) degrees rise in the heat index.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is the result of factoring in humidity to the air temperature, indicating perceived warmth. Depending on the activity and the individual's heat perception, which may vary due to factors including wind, clothing, and metabolic variations, this effect remains subjective. Exposure to direct sun rays can influence the heat you feel, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Children often overlook the need for breaks and fluid intake. Thirst is a late-stage sign of dehydration - hence, it is necessary to stay hydrated, especially during extended periods of physical activities.
When it comes to cooling down, the human body's primary method is through perspiration, making use of sweat evaporation to eliminate excess heat. Relative humidity in excess curtails evaporation, therefore reducing heat dissipation from the body, leading to feelings of excess heat. Overheating and dehydration threats arise when heat gain goes beyond what the body can comfortably shed.
Humidity
In September, the average relative humidity in Katy is 75%.Rainfall
In Katy, Texas, during September, the rain falls for 18.8 days and regularly aggregates up to 3.66" (93mm) of precipitation. In Katy, during the entire year, the rain falls for 169 days and collects up to 30.12" (765mm) of precipitation.Snowfall
In Katy, snow does not fall in February through November.Daylight
In September, the average length of the day is 12h and 20min.On the first day of the month, sunrise is at 7:00 am and sunset at 7:45 pm. On the last day of September, sunrise is at 7:16 am and sunset at 7:09 pm CDT.
Sunshine
In Katy, Texas, the average sunshine in September is 8.5h.UV index
The average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: In September, the maximum UV index of 6 suggests this advice:
Conform to measures and uphold sun safety traditions. Warding off skin and eye harm is necessary. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Frequently asked questions
How hot is September in Katy?
What is the average humidity in September in Katy?
How much does it rain in Katy in September?
When it does not snow in Katy?
How many hours of daylight does Katy have in September?
When are sunrise and sunset in September in Katy?
How long on average sun shines in September in Katy?
What is the UV index intensity in September in Katy?
Average temperature in September
Katy, TX
- Average high temperature in September: 88.7°F
The warmest month (with the highest average high temperature) is August (94.6°F).
The month with the lowest average high temperature is January (61°F).
- Average low temperature in September: 71.8°F
The month with the highest average low temperature is August (75.7°F).
The coldest month (with the lowest average low temperature) is January (45°F).
Average pressure in September
Katy, TX
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Katy, TX
- Average wind speed in September: 5.7mph
The windiest month (with the highest average wind speed) is April (8.4mph).
The calmest month (with the lowest average wind speed) is September (5.7mph).
Average humidity in September
Katy, TX
- Average humidity in September: 75%
The months with the highest relative humidity are February and March (78%).
The months with the lowest relative humidity are August and October (71%).
Average rainfall in September
Katy, TX
- Average rainfall in September: 3.66"
The wettest month (with the highest rainfall) is May (4.29").
The driest month (with the least rainfall) is February (1.42").
Average rainfall days in September
Katy, TX
- Average rainfall days in September: 18.8 days
The month with the highest number of rainy days is September (18.8 days).
The month with the least rainy days is January (10.5 days).
Average snowfall in September
Katy, TX
- Average snowfall in September: 0"
The month with the highest snowfall is December (0.12").
The months with the least snowfall are February, March, April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Katy, TX
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (0.4 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Katy, TX
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 0min).
The month with the shortest days is December (Average daylight: 10h and 18min).
- Average sunshine in September: 8h and 3min
The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is December (Average sunshine: 4h and 54min).
Average sunshine days in September
Katy, TX
- Average sunshine days in September: 8.9 days
The month with the most sunshine days is January (18.7 days).
The month with the least sunshine days is September (8.9 days).
Average UV index in September
Katy, TX
- Average UV index in September: 6
The months with the highest UV index are May, June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in September
Katy, TX
- Average cloud cover in September: 33
The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in September
Katy, TX
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, June, August, September, October, November and December (6mi).
The months with the lowest visibility are April, May and July (5mi).
Katy, Texas, USA
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