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 ushers in a minor alteration in Charlestown's climate, with the average high-temperature moving from August's 85.6°F (29.8°C) to a still warm 79.2°F (26.2°C). An average nighttime temperature of 59.7°F (15.4°C) is witnessed in Charlestown throughout September.Humidity
The months with the lowest humidity in Charlestown are August through October, with an average relative humidity of 74%.Rainfall
September is the month with the least rainfall. Rain falls for 13.3 days and accumulates 1.54" (39mm) of precipitation.Snowfall
In Charlestown, snow does not fall in May through October.Daylight
The average length of the day in September is 12h and 25min.On the first day of September, sunrise is at 7:12 am and sunset at 8:12 pm. On the last day of the month, sunrise is at 7:38 am and sunset at 7:26 pm EDT.
Sunshine
In Charlestown, the average sunshine in September is 8.4h.UV index
The average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the average person.Note: An average maximum UV index of 5 in September leads to these recommendations:
Prioritize safety - Suggestions to prevent sun damage are offered. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Charlestown?
What is the least humid month in Charlestown?
What is the average humidity in September in Charlestown?
What is the driest month in Charlestown?
How much does it rain in Charlestown in September?
When it does not snow in Charlestown?
How many hours of daylight does Charlestown have in September?
What time are sunrise and sunset in September in Charlestown?
How long on average sun shines in September in Charlestown?
What is the UV index reading in September in Charlestown?
Average temperature in September
Charlestown, IN
- Average high temperature in September: 79.2°F
The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (38.5°F).
- Average low temperature in September: 59.7°F
The month with the highest average low temperature is July (66.9°F).
The coldest month (with the lowest average low temperature) is January (25.2°F).
Average pressure in September
Charlestown, IN
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
Charlestown, IN
- Average wind speed in September: 5.3mph
The windiest months (with the highest average wind speed) are January and February (7.8mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in September
Charlestown, IN
- Average humidity in September: 74%
The months with the highest relative humidity are February and December (80%).
The months with the lowest relative humidity are August, September and October (74%).
Average rainfall in September
Charlestown, IN
- Average rainfall in September: 1.54"
The wettest month (with the highest rainfall) is April (2.99").
The driest month (with the least rainfall) is September (1.54").
Average rainfall days in September
Charlestown, IN
- Average rainfall days in September: 13.3 days
The month with the highest number of rainy days is May (17.6 days).
The month with the least rainy days is November (9.8 days).
Average snowfall in September
Charlestown, IN
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.77").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Charlestown, IN
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.7 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
Charlestown, IN
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 8h and 2min
The months with the most sunshine are June and July (Average sunshine: 10h and 18min).
The month with the least sunshine is December (Average sunshine: 4h and 18min).
Average sunshine days in September
Charlestown, IN
- Average sunshine days in September: 14.8 days
The month with the most sunshine days is October (18.4 days).
The month with the least sunshine days is May (11.4 days).
Average UV index in September
Charlestown, IN
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Charlestown, IN
- Average cloud cover in September: 33
The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in September
Charlestown, IN
- Average visibility in September: 6mi
The months with the highest visibility are March, April, June, August, September, October and November (6mi).
The months with the lowest visibility are January, February, May, July and December (5mi).
Charlestown, Indiana, USA
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