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
The advent of September brings a subtle shift in temperature, with the average high moving from a warm 80.2°F (26.8°C) in August to a still moderately hot 73.4°F (23°C). Throughout the month of September, Berkeley reports a steady low-temperature average of 58.6°F (14.8°C).Humidity
In September, the average relative humidity in Berkeley is 74%.Rainfall
In Berkeley, in September, it is raining for 13.5 days, with typically 1.89" (48mm) of accumulated precipitation. Throughout the year, in Berkeley, there are 149.4 rainfall days, and 25.08" (637mm) of precipitation is accumulated.Snowfall
In Berkeley, snow does not fall in June through September.Daylight
In September, the average length of the day in Berkeley is 12h and 28min.On the first day of the month, sunrise is at 6:18 am and sunset at 7:24 pm. On the last day of September, sunrise is at 6:48 am and sunset at 6:34 pm CDT.
Sunshine
In Berkeley, the average sunshine in September is 8.8h.UV index
In Berkeley, Illinois, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the average person.Note: A daily maximum UV index of 4 in September translates into the following instructions:
Adopt protective measures - Suggestions to resist sunburn are offered. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Berkeley?
What is the average humidity in September in Berkeley?
How much does it rain in Berkeley in September?
When it does not snow in Berkeley?
Does it snow in Berkeley in September?
How many hours of daylight does Berkeley have in September?
When are sunrise and sunset in September in Berkeley?
How many hours of sunshine does Berkeley have in September?
What is the UV index reading in September in Berkeley?
Average temperature in September
Berkeley, IL
- Average high temperature in September: 73.4°F
The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (28.8°F).
- Average low temperature in September: 58.6°F
The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (18°F).
Average pressure in September
Berkeley, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Berkeley, IL
- Average wind speed in September: 7.5mph
The windiest month (with the highest average wind speed) is January (10.2mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity in September
Berkeley, IL
- Average humidity in September: 74%
The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Berkeley, IL
- Average rainfall in September: 1.89"
The wettest month (with the highest rainfall) is May (3.11").
The driest month (with the least rainfall) is December (1.14").
Average rainfall days in September
Berkeley, IL
- Average rainfall days in September: 13.5 days
The months with the highest number of rainy days are May and July (17.3 days).
The month with the least rainy days is February (5.1 days).
Average snowfall in September
Berkeley, IL
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.86").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Berkeley, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Berkeley, IL
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 8h and 5min
The months with the most sunshine are July and August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in September
Berkeley, IL
- Average sunshine days in September: 13 days
The month with the most sunshine days is November (16.8 days).
The month with the least sunshine days is July (9.5 days).
Average UV index in September
Berkeley, IL
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Berkeley, IL
- Average cloud cover in September: 31
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in September
Berkeley, 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).
Berkeley, Illinois, USA
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