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
September is marked by a subtle drop in average high-temperatures, transitioning from a warm 84.7°F (29.3°C) in August to a still moderately hot 78.8°F (26°C). During the month of September, an average low-temperature of 58.1°F (14.5°C) is recorded.Humidity
In Grimsley, the average relative humidity in September is 78%.Rainfall
The month with the least rainfall is September, when the rain falls for 13.4 days and typically collects 2.32" (59mm) of precipitation.Snowfall
In Grimsley, snow does not fall in May through September.Daylight
The average length of the day in September is 12h and 24min.On the first day of the month, sunrise is at 6:12 am and sunset at 7:07 pm. On the last day of September, sunrise is at 6:34 am and sunset at 6:24 pm CDT.
Sunshine
The average sunshine in September is 7.9h.UV index
In Grimsley, Tennessee, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum UV index, 5 during September, leads to the following recommendations:
Ensure safety - Recommendations to avert sunburn are presented. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. 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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature?
What is the average humidity in September?
What is the driest month?
How many days does it rain in September?
When it does not snow?
Does it snow in September?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Grimsley have in September?
What is the UV index reading in September?
Average temperature in September
Grimsley, TN
- Average high temperature in September: 78.8°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (41.7°F).
- Average low temperature in September: 58.1°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (27.7°F).
Average pressure in September
Grimsley, TN
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).
Average wind speed in September
Grimsley, TN
- Average wind speed in September: 4.3mph
The windiest month (with the highest average wind speed) is February (7.3mph).
The calmest month (with the lowest average wind speed) is August (4mph).
Average humidity in September
Grimsley, TN
- Average humidity in September: 78%
The month with the highest relative humidity is December (81%).
The months with the lowest relative humidity are April, June, August, October and November (77%).
Average rainfall in September
Grimsley, TN
- Average rainfall in September: 2.32"
The wettest month (with the highest rainfall) is February (4.13").
The driest month (with the least rainfall) is September (2.32").
Average rainfall days in September
Grimsley, TN
- Average rainfall days in September: 13.4 days
The month with the highest number of rainy days is July (18.2 days).
The month with the least rainy days is November (10.4 days).
Average snowfall in September
Grimsley, TN
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.94").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Grimsley, TN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.1 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Grimsley, TN
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in September: 7h and 5min
The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 12min).
Average sunshine days in September
Grimsley, TN
- Average sunshine days in September: 14.1 days
The month with the most sunshine days is October (18 days).
The month with the least sunshine days is July (10.5 days).
Average UV index in September
Grimsley, TN
- Average UV index in September: 5
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in September
Grimsley, TN
- Average cloud cover in September: 36
The month with the most cloud cover is February (Cloud cover 57).
The month with the least cloud cover is June (Cloud cover 32).
Average visibility in September
Grimsley, TN
- Average visibility in September: 5mi
The months with the highest visibility are April and November (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October and December (5mi).
Grimsley, Tennessee, USA
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