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
A modest decline in the average high-temperature is seen during September, decreasing from a warm 76.1°F (24.5°C) in August to a pleasant 70.5°F (21.4°C). Charlestown sustains a near constant temperature throughout September, with nighttime averages of 61.7°F (16.5°C).Humidity
In Charlestown, Rhode Island, the average relative humidity in September is 78%.Rainfall
September is the month with the least rainfall in Charlestown. Rain falls for 12.2 days and accumulates 1.69" (43mm) of precipitation.Snowfall
In Charlestown, snow does not fall in April through October.Daylight
In September, the average length of the day in Charlestown is 12h and 28min.On the first day of September, sunrise is at 6:13 am and sunset at 7:19 pm. On the last day of the month, sunrise is at 6:43 am and sunset at 6:29 pm EDT.
Sunshine
In Charlestown, Rhode Island, the average sunshine in September is 9h.UV index
In Charlestown, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: In September, a daily maximum UV index of 5 leads to the following instructions:
Undertake precautions - It is suggested to shield oneself from sunburn. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September in Charlestown?
What is the average humidity in September in Charlestown?
What is the driest month in Charlestown?
How many days does it rain in September in Charlestown?
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, RI
- Average high temperature in September: 70.5°F
The warmest month (with the highest average high temperature) is August (76.1°F).
The month with the lowest average high temperature is January (37.6°F).
- Average low temperature in September: 61.7°F
The months with the highest average low temperature are July and August (68.2°F).
The coldest month (with the lowest average low temperature) is January (28.8°F).
Average pressure in September
Charlestown, RI
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Charlestown, RI
- Average wind speed in September: 10.7mph
The windiest month (with the highest average wind speed) is January (14.8mph).
The calmest month (with the lowest average wind speed) is July (9.5mph).
Average humidity in September
Charlestown, RI
- Average humidity in September: 78%
The month with the highest relative humidity is June (82%).
The months with the lowest relative humidity are March and November (74%).
Average rainfall in September
Charlestown, RI
- Average rainfall in September: 1.69"
The wettest month (with the highest rainfall) is December (3.66").
The driest month (with the least rainfall) is September (1.69").
Average rainfall days in September
Charlestown, RI
- Average rainfall days in September: 12.2 days
The month with the highest number of rainy days is July (15.8 days).
The month with the least rainy days is January (8.8 days).
Average snowfall in September
Charlestown, RI
- Average snowfall in September: 0"
The month with the highest snowfall is March (2.6").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Charlestown, RI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (4.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Charlestown, RI
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 9h and 0min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The months with the least sunshine are February and December (Average sunshine: 4h and 54min).
Average sunshine days in September
Charlestown, RI
- Average sunshine days in September: 16.3 days
The month with the most sunshine days is November (16.9 days).
The month with the least sunshine days is July (12.9 days).
Average UV index in September
Charlestown, RI
- 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, March and December (UV index 2).
Average cloud cover in September
Charlestown, RI
- Average cloud cover in September: 30
The months with the most cloud cover are February, March and December (Cloud cover 47).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in September
Charlestown, RI
- 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).
Charlestown, Rhode Island, USA
Weather forecast for your location
2. Allow the app to use your location