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
A modest decline in the average high-temperature is seen during September, decreasing from a fiery hot 96.3°F (35.7°C) in August to a tropical 87.8°F (31°C). During September, Grandfalls experiences an average low-temperature of 70.2°F (21.2°C) at night.Heat index
The average heat index in September is appraised at a tropical 89.6°F (32°C). If exposure and activity persist, fatigue could ensue, possibly leading to heat cramps.Given the heat index, its values are aligned with shaded sites and gentle winds. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is an indicator that blends the effects of temperature and humidity to depict perceived warmth. The impact of weather is personal, differing among a variety of people based on differences in body mass, height, and the level of physical exertion. Always consider that direct sunlight exposure might heighten the heat's effects, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Young kids are often more at risk than adults as they tend to perspire less. Besides, their skin surface is larger relative to their small bodies, and their increased heat output from their active lifestyle compounds their risk.
Humidity
The months with the highest humidity are September and December, with an average relative humidity of 49%.Rainfall
In September, the rain falls for 10 days. Throughout September, 0.94" (24mm) of precipitation is accumulated. Throughout the year, there are 63.3 rainfall days, and 6.61" (168mm) of precipitation is accumulated.Snowfall
In Grandfalls, snow does not fall in April through October.Daylight
The average length of the day in September is 12h and 20min.On the first day of the month, sunrise is at 7:27 am and sunset at 8:14 pm. On the last day of September, sunrise is at 7:44 am and sunset at 7:37 pm CDT.
Sunshine
The average sunshine in September in Grandfalls is 9.2h.UV index
In September, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In September, an average UV index of 6 transforms into the following instructions:
Prevent overexposure. Protection from the sun's harmful effects is needed. To the best of your ability, limit your exposure to the sun between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it hot during September?
What are the most humid months?
What is the average humidity in September in Grandfalls?
How many days does it rain in September in Grandfalls?
When it does not snow in Grandfalls?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Grandfalls have in September?
How high is the UV index in September?
Average temperature in September
Grandfalls, TX
- Average high temperature in September: 87.8°F
The warmest month (with the highest average high temperature) is June (96.4°F).
The month with the lowest average high temperature is December (58.3°F).
- Average low temperature in September: 70.2°F
The month with the highest average low temperature is August (77°F).
The coldest month (with the lowest average low temperature) is January (39.4°F).
Average pressure in September
Grandfalls, TX
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in September
Grandfalls, TX
- Average wind speed in September: 10.6mph
The windiest month (with the highest average wind speed) is June (13.2mph).
The calmest month (with the lowest average wind speed) is December (8.9mph).
Average humidity in September
Grandfalls, TX
- Average humidity in September: 49%
The months with the highest relative humidity are September and December (49%).
The month with the lowest relative humidity is April (31%).
Average rainfall in September
Grandfalls, TX
- Average rainfall in September: 0.94"
The wettest month (with the highest rainfall) is May (1.1").
The driest month (with the least rainfall) is February (0.08").
Average rainfall days in September
Grandfalls, TX
- Average rainfall days in September: 10 days
The month with the highest number of rainy days is September (10 days).
The month with the least rainy days is February (1.9 days).
Average snowfall in September
Grandfalls, TX
- Average snowfall in September: 0"
The months with the highest snowfall are November and December (0.31").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Grandfalls, TX
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (1 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
Grandfalls, TX
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 12min).
The month with the shortest days is December (Average daylight: 10h and 6min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is June (Average sunshine: 11h and 48min).
The month with the least sunshine is December (Average sunshine: 7h and 0min).
Average sunshine days in September
Grandfalls, TX
- Average sunshine days in September: 18.1 days
The month with the most sunshine days is January (27.8 days).
The month with the least sunshine days is September (18.1 days).
Average UV index in September
Grandfalls, TX
- Average UV index in September: 6
The month with the highest UV index is July (UV index 8).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in September
Grandfalls, TX
- Average cloud cover in September: 20
The month with the most cloud cover is September (Cloud cover 20).
The month with the least cloud cover is June (Cloud cover 12).
Average visibility in September
Grandfalls, 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).
Grandfalls, Texas, USA
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