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 beginning signals an average high-temperature of a still moderately hot 75.4°F (24.1°C), barely different from August's 80.2°F (26.8°C). September witnesses an average low-temperature hovering around a mild 57.6°F (14.2°C).Humidity
The average relative humidity in September is 77%.Rainfall
In Castleton, in September, during 12.6 rainfall days, 1.54" (39mm) of precipitation is typically accumulated. In Castleton, during the entire year, the rain falls for 141 days and collects up to 20.98" (533mm) of precipitation.Snowfall
May through September are months without snowfall.Daylight
The average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 7:12 am and sunset at 8:15 pm. On the last day of September, sunrise is at 7:40 am and sunset at 7:27 pm EDT.
Sunshine
In September, the average sunshine is 8.2h.UV index
In Castleton, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: In September, an average UV index of 5 transforms into the following instructions:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Castleton 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 Castleton in September?
How many hours of daylight does Castleton have in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
What is the UV index reading in September in Castleton?
Average temperature in September
Castleton, IN
- Average high temperature in September: 75.4°F
The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (32.5°F).
- Average low temperature in September: 57.6°F
The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (20.7°F).
Average pressure in September
Castleton, IN
- Average pressure in September: 30.03"Hg
The months with the highest atmospheric pressure are January and November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Castleton, IN
- Average wind speed in September: 6.6mph
The windiest month (with the highest average wind speed) is January (10mph).
The calmest month (with the lowest average wind speed) is August (5.9mph).
Average humidity in September
Castleton, IN
- Average humidity in September: 77%
The months with the highest relative humidity are January and December (83%).
The month with the lowest relative humidity is October (74%).
Average rainfall in September
Castleton, IN
- Average rainfall in September: 1.54"
The wettest month (with the highest rainfall) is May (2.64").
The driest month (with the least rainfall) is February (1.18").
Average rainfall days in September
Castleton, IN
- Average rainfall days in September: 12.6 days
The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is January (6 days).
Average snowfall in September
Castleton, IN
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.01").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Castleton, IN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Castleton, 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 1min
The months with the most sunshine are June and July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in September
Castleton, IN
- Average sunshine days in September: 14.8 days
The months with the most sunshine days are October and November (18.7 days).
The month with the least sunshine days is May (11.3 days).
Average UV index in September
Castleton, IN
- Average UV index in September: 5
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
Castleton, IN
- Average cloud cover in September: 34
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in September
Castleton, IN
- 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).
Castleton, Indiana, USA
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