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
The transition to September results in a modest reduction in average high-temperature, moving from a hot 89.2°F (31.8°C) in August to a warm 82.2°F (27.9°C). Jamestown experiences a nighttime temperature average of 63.1°F (17.3°C) during September.Heat index
The heat index in September is evaluated at a hot 87.8°F (31°C). Long-standing exposure coupled with ongoing activity could result in exhaustion, possibly causing heat cramps.Be informed that the heat index values are oriented around shady conditions and gentle breezes. Heat index values may surge by up to 15 Fahrenheit (8 Celsius) degrees in the presence of direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is an estimation of the warmth sensation when considering humidity levels. An individual's perception of weather can be influenced by a variety of factors including metabolic differences, being pregnant, and their degree of physical exertion. Keep it in mind, direct sunlight can augment the heat you experience, possibly pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Young ones generally face higher dangers than adults since they sweat less. Along with their large skin surface area compared totheir small bodies and increased heat production from their activities, the risks are heightened.
Humidity
In September, the average relative humidity in Jamestown, Oklahoma, is 71%.Rainfall
In Jamestown, in September, it is raining for 9.7 days, with typically 2.52" (64mm) of accumulated precipitation. Throughout the year, there are 125.4 rainfall days, and 23.19" (589mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall.Daylight
The average length of the day in September in Jamestown, Oklahoma, is 12h and 24min.On the first day of September in Jamestown, sunrise is at 6:54 am and sunset at 7:50 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 7:06 pm CDT.
Sunshine
In Jamestown, the average sunshine in September is 9h.UV index
The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for ordinary individuals.Note: The maximum daily UV index of 5 in September interprets into the following recommendations:
Prioritize safety - Recommendations to avert sunburn are shared. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. 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
What is the temperature in September in Jamestown?
What is the average humidity in September in Jamestown?
How much does it rain in September?
When it does not snow?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Jamestown have in September?
What is the UV index intensity in September?
Average temperature in September
Jamestown, OK
- Average high temperature in September: 82.2°F
The warmest month (with the highest average high temperature) is July (90.3°F).
The month with the lowest average high temperature is January (45°F).
- Average low temperature in September: 63.1°F
The month with the highest average low temperature is July (71.4°F).
The coldest month (with the lowest average low temperature) is January (29.7°F).
Average pressure in September
Jamestown, OK
- Average pressure in September: 30"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Jamestown, OK
- Average wind speed in September: 7.6mph
The windiest month (with the highest average wind speed) is March (10.9mph).
The calmest months (with the lowest average wind speed) are July and August (7.1mph).
Average humidity in September
Jamestown, OK
- Average humidity in September: 71%
The month with the highest relative humidity is May (81%).
The month with the lowest relative humidity is October (68%).
Average rainfall in September
Jamestown, OK
- Average rainfall in September: 2.52"
The wettest month (with the highest rainfall) is May (4.06").
The driest month (with the least rainfall) is November (0.75").
Average rainfall days in September
Jamestown, OK
- Average rainfall days in September: 9.7 days
The month with the highest number of rainy days is May (14.8 days).
The month with the least rainy days is January (6.2 days).
Average snowfall in September
Jamestown, OK
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.79").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Jamestown, OK
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (2.8 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, OK
- 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: 9h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 36min).
Average sunshine days in September
Jamestown, OK
- Average sunshine days in September: 17.7 days
The month with the most sunshine days is November (21.9 days).
The month with the least sunshine days is May (12.9 days).
Average UV index in September
Jamestown, OK
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in September
Jamestown, OK
- Average cloud cover in September: 28
The month with the most cloud cover is March (Cloud cover 42).
The months with the least cloud cover are July and August (Cloud cover 23).
Average visibility in September
Jamestown, OK
- 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).
Jamestown, Oklahoma, USA
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