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
In September, the average high-temperature goes from a torrid 96.6°F (35.9°C) in August to a hot 87.3°F (30.7°C). In Fort Griffin, the nighttime temperature averages to a pleasant 68.7°F (20.4°C) during September.Heat index
The heat index for September is evaluated at a tropical 93.2°F (34°C). Greater safety measures are needed, risk of heat exhaustion and heat cramps is high. Continuous activity might trigger heatstroke.Note that heat index values are valued for light wind and location in the shade. Direct sunlight can cause a surge in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', determines the feeling of heat when you account for the relative humidity. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. When you're directly under the sun's rays, remember that the heat index may surge by 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.
Humidity
The average relative humidity in September is 59%.Rainfall
In Fort Griffin, during September, the rain falls for 12.1 days and regularly aggregates up to 2.2" (56mm) of precipitation. In Fort Griffin, during the entire year, the rain falls for 98.6 days and collects up to 17.64" (448mm) of precipitation.Snowfall
In Fort Griffin, snow does not fall in April 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 7:11 am and sunset at 8:01 pm. On the last day of September, sunrise is at 7:30 am and sunset at 7:22 pm CDT.
Sunshine
In September, the average sunshine is 8.7h.UV index
In Fort Griffin, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: A maximum UV index of 6 in September translates into the following recommendations:
Adopt measures and apply sun safety strategies. Shielding from skin and eye damage is necessary. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is it in September?
What is the average humidity in September?
How much does it rain in September?
When it does not snow in Fort Griffin?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Fort Griffin, TX
- Average high temperature in September: 87.3°F
The warmest month (with the highest average high temperature) is August (96.6°F).
The month with the lowest average high temperature is December (56.1°F).
- Average low temperature in September: 68.7°F
The months with the highest average low temperature are July and August (75.2°F).
The coldest month (with the lowest average low temperature) is January (38.1°F).
Average pressure in September
Fort Griffin, TX
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in September
Fort Griffin, TX
- Average wind speed in September: 8.8mph
The windiest month (with the highest average wind speed) is April (12.9mph).
The calmest month (with the lowest average wind speed) is September (8.8mph).
Average humidity in September
Fort Griffin, TX
- Average humidity in September: 59%
The month with the highest relative humidity is May (61%).
The month with the lowest relative humidity is August (48%).
Average rainfall in September
Fort Griffin, TX
- Average rainfall in September: 2.2"
The wettest month (with the highest rainfall) is May (2.36").
The driest months (with the least rainfall) are January and February (0.87").
Average rainfall days in September
Fort Griffin, TX
- Average rainfall days in September: 12.1 days
The month with the highest number of rainy days is September (12.1 days).
The month with the least rainy days is January (4.6 days).
Average snowfall in September
Fort Griffin, TX
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.77").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Fort Griffin, TX
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.7 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
Fort Griffin, 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 July (Average sunshine: 11h and 24min).
The month with the least sunshine is December (Average sunshine: 6h and 18min).
Average sunshine days in September
Fort Griffin, TX
- Average sunshine days in September: 15.5 days
The month with the most sunshine days is January (25 days).
The month with the least sunshine days is September (15.5 days).
Average UV index in September
Fort Griffin, 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 2).
Average cloud cover in September
Fort Griffin, TX
- Average cloud cover in September: 26
The month with the most cloud cover is March (Cloud cover 29).
The month with the least cloud cover is August (Cloud cover 17).
Average visibility in September
Fort Griffin, 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).
Fort Griffin, Texas, USA
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