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 brings a slight decrease in the average high-temperature, shifting from a warm 84.2°F (29°C) in August to a still moderately hot 78.3°F (25.7°C). A significant drop from the day's peak to an average low-temperature of 56.3°F (13.5°C) is noted during the nights in September in Grigsby.Humidity
The average relative humidity in September in Grigsby is 77%.Rainfall
September is the month with the least rainfall in Grigsby, Kentucky. Rain falls for 13.4 days and accumulates 1.46" (37mm) of precipitation.Snowfall
May through September are months without snowfall.Daylight
The average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 7:03 am and sunset at 8:00 pm. On the last day of September, sunrise is at 7:27 am and sunset at 7:16 pm EDT.
Sunshine
In Grigsby, Kentucky, the average sunshine in September is 8.3h.UV index
In Grigsby, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: A typical high UV index of 4 in September suggests the following recommendations:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature in Grigsby?
What is the average humidity in September in Grigsby?
What is the driest month in Grigsby?
How many days does it rain in September in Grigsby?
When it does not snow in Grigsby?
Does it snow in Grigsby in September?
What is the average length of the day in September in Grigsby?
When is the sunrise / sunset in September in Grigsby?
How long on average sun shines in September in Grigsby?
What is the UV index reading in September in Grigsby?
Average temperature in September
Grigsby, KY
- Average high temperature in September: 78.3°F
The warmest month (with the highest average high temperature) is July (85.3°F).
The month with the lowest average high temperature is January (40.6°F).
- Average low temperature in September: 56.3°F
The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (27°F).
Average pressure in September
Grigsby, KY
- Average pressure in September: 30.05"Hg
The months with the highest atmospheric pressure are January and November (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).
Average wind speed in September
Grigsby, KY
- Average wind speed in September: 4.2mph
The windiest month (with the highest average wind speed) is April (6.7mph).
The calmest month (with the lowest average wind speed) is August (4mph).
Average humidity in September
Grigsby, KY
- Average humidity in September: 77%
The months with the highest relative humidity are February and December (80%).
The month with the lowest relative humidity is November (75%).
Average rainfall in September
Grigsby, KY
- Average rainfall in September: 1.46"
The wettest month (with the highest rainfall) is February (2.76").
The driest month (with the least rainfall) is September (1.46").
Average rainfall days in September
Grigsby, KY
- Average rainfall days in September: 13.4 days
The month with the highest number of rainy days is May (18.6 days).
The month with the least rainy days is November (10.5 days).
Average snowfall in September
Grigsby, KY
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.15").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Grigsby, KY
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.3 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
Grigsby, KY
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 8h and 2min
The months with the most sunshine are June, July and August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in September
Grigsby, KY
- Average sunshine days in September: 14 days
The month with the most sunshine days is November (17.3 days).
The month with the least sunshine days is May (9.7 days).
Average UV index in September
Grigsby, KY
- Average UV index in September: 4
The months with the highest UV index are May, June 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
Grigsby, KY
- Average cloud cover in September: 35
The month with the most cloud cover is February (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in September
Grigsby, KY
- Average visibility in September: 5mi
The months with the highest visibility are April, October and November (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September and December (5mi).
Grigsby, Kentucky, USA
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