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
Stepping into September, Jamestown records an average high-temperature of a still moderately hot 74.8°F (23.8°C), almost consistent with August. Jamestown records an average nighttime low-temperature of 57.4°F (14.1°C) throughout September.Humidity
In Jamestown, the average relative humidity in September is 78%.Rainfall
In Jamestown, in September, during 13.3 rainfall days, 2.17" (55mm) of precipitation is typically accumulated. Throughout the year, in Jamestown, there are 164.1 rainfall days, and 31.61" (803mm) of precipitation is accumulated.Snowfall
In Jamestown, snow does not fall in May through September.Daylight
In Jamestown, the average length of the day in September is 12h and 26min.On the first day of September, sunrise is at 7:15 am and sunset at 8:17 pm. On the last day of the month, sunrise is at 7:42 am and sunset at 7:29 pm EDT.
Sunshine
In September, the average sunshine is 8h.UV index
In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the average person.Note: In September, an average UV index of 4 transforms into the following instructions:
Be vigilant - A duty to shield skin and eyes from injury exists. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
What is the average humidity in September?
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?
What time are sunrise and sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Jamestown, IN
- Average high temperature in September: 74.8°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (32.2°F).
- Average low temperature in September: 57.4°F
The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (20.3°F).
Average pressure in September
Jamestown, IN
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Jamestown, IN
- Average wind speed in September: 7.1mph
The windiest months (with the highest average wind speed) are January and February (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.2mph).
Average humidity in September
Jamestown, IN
- Average humidity in September: 78%
The months with the highest relative humidity are January, July and December (83%).
The month with the lowest relative humidity is October (74%).
Average rainfall in September
Jamestown, IN
- Average rainfall in September: 2.17"
The wettest month (with the highest rainfall) is April (3.86").
The driest months (with the least rainfall) are February and November (1.85").
Average rainfall days in September
Jamestown, IN
- Average rainfall days in September: 13.3 days
The month with the highest number of rainy days is May (20.3 days).
The months with the least rainy days are January and February (7.8 days).
Average snowfall in September
Jamestown, IN
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.62").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Jamestown, IN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Jamestown, IN
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in September: 8h and 0min
The month with the most sunshine is June (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in September
Jamestown, IN
- Average sunshine days in September: 15 days
The month with the most sunshine days is November (17.1 days).
The month with the least sunshine days is June (9.3 days).
Average UV index in September
Jamestown, IN
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Jamestown, IN
- Average cloud cover in September: 35
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in September
Jamestown, IN
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
Jamestown, Indiana, USA
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