September weather forecastBrownstown, IL
September
Weather in September
The first month of the autumn, September, is still a warm month in Brownstown, Illinois, with an average temperature fluctuating between 59.4°F (15.2°C) and 77.9°F (25.5°C).Temperature
At the onset of September, Brownstown records an average high-temperature of a still warm 77.9°F (25.5°C), showing little deviation from the preceding month. Nighttime temperature in Brownstown experiences an average drop to a moderate 59.4°F (15.2°C) in September.Humidity
In September, the average relative humidity is 75%.Rainfall
In Brownstown, during September, the rain falls for 11.5 days and regularly aggregates up to 1.34" (34mm) of precipitation. In Brownstown, during the entire year, the rain falls for 139.3 days and collects up to 23.94" (608mm) of precipitation.Snowfall
In Brownstown, snow does not fall in May through October.Daylight
In September, the average length of the day in Brownstown is 12h and 26min.On the first day of September in Brownstown, sunrise is at 6:25 am and sunset at 7:25 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 6:39 pm CDT.
Sunshine
In Brownstown, the average sunshine in September is 9.2h.UV index
In Brownstown, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for average individuals.Note: The maximum UV index of 5 during September translates into these guidelines:
Exercise prevention - Protecting skin and eyes from harm is required. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Brownstown, IL
- Average high temperature in September: 77.9°F
The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (36°F).
- Average low temperature in September: 59.4°F
The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).
Average pressure in September
Brownstown, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Brownstown, IL
- Average wind speed in September: 6.6mph
The windiest month (with the highest average wind speed) is January (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).
Average humidity in September
Brownstown, IL
- Average humidity in September: 75%
The months with the highest relative humidity are July and August (81%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Brownstown, IL
- Average rainfall in September: 1.34"
The wettest months (with the highest rainfall) are April and June (2.95").
The driest month (with the least rainfall) is February (1.18").
Average rainfall days in September
Brownstown, IL
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is July (16 days).
The month with the least rainy days is January (7.3 days).
Average snowfall in September
Brownstown, IL
- Average snowfall in September: 0"
The month with the highest snowfall is December (1.65").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Brownstown, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (5.7 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
Brownstown, IL
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 9h and 12min
The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in September
Brownstown, IL
- Average sunshine days in September: 16.4 days
The months with the most sunshine days are January and November (19.5 days).
The months with the least sunshine days are May and July (12.3 days).
Average UV index in September
Brownstown, IL
- 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
Brownstown, IL
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 53).
The months with the least cloud cover are June and July (Cloud cover 29).
Average visibility in September
Brownstown, IL
- 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).
