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's onset introduces a mild reduction in the average high-temperature, from 85.5°F (29.7°C) in August to a still moderately hot 79.5°F (26.4°C). An average low-temperature of 59.4°F (15.2°C) is recorded during the nights in September.Humidity
The months with the lowest humidity are April, June, August through November, with an average relative humidity of 76%.Rainfall
September is the month with the least rainfall. Rain falls for 13.8 days and accumulates 2.4" (61mm) of precipitation.Snowfall
May through September are months without snowfall.Daylight
In September, the average length of the day is 12h and 25min.On the first day of September, sunrise is at 6:11 am and sunset at 7:08 pm. On the last day of the month, sunrise is at 6:35 am and sunset at 6:24 pm CDT.
Sunshine
The average sunshine in September is 8.2h.UV index
In Jamestown, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for average individuals.Note: In September, the maximum UV index of 5 suggests this advice:
Ensure safety - Sun damage prevention is strongly urged. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Jamestown in September?
What are the least humid months?
What is the average humidity in September?
What is the driest month in Jamestown?
How much does it rain in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Jamestown have in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Jamestown, KY
- Average high temperature in September: 79.5°F
The warmest month (with the highest average high temperature) is July (86.2°F).
The month with the lowest average high temperature is January (41.5°F).
- Average low temperature in September: 59.4°F
The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (27.9°F).
Average pressure in September
Jamestown, KY
- 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 (29.96"Hg).
Average wind speed in September
Jamestown, KY
- Average wind speed in September: 4.8mph
The windiest month (with the highest average wind speed) is February (7.9mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).
Average humidity in September
Jamestown, KY
- Average humidity in September: 76%
The months with the highest relative humidity are February and December (80%).
The months with the lowest relative humidity are April, June, August, September, October and November (76%).
Average rainfall in September
Jamestown, KY
- Average rainfall in September: 2.4"
The wettest month (with the highest rainfall) is February (4.25").
The driest month (with the least rainfall) is September (2.4").
Average rainfall days in September
Jamestown, KY
- Average rainfall days in September: 13.8 days
The month with the highest number of rainy days is July (18.6 days).
The month with the least rainy days is November (11.8 days).
Average snowfall in September
Jamestown, KY
- Average snowfall in September: 0"
The months with the highest snowfall are January and February (2.91").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Jamestown, KY
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.8 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
Jamestown, 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 42min).
- Average sunshine in September: 8h and 1min
The months with the most sunshine are June and August (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 0min).
Average sunshine days in September
Jamestown, KY
- Average sunshine days in September: 14.3 days
The month with the most sunshine days is November (16.1 days).
The month with the least sunshine days is February (9.6 days).
Average UV index in September
Jamestown, KY
- 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
Jamestown, KY
- Average cloud cover in September: 34
The month with the most cloud cover is February (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in September
Jamestown, KY
- Average visibility in September: 5mi
The months with the highest visibility are April, June, October and November (6mi).
The months with the lowest visibility are January, February, March, May, July, August, September and December (5mi).
Jamestown, Kentucky, USA
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