September weather forecastMorrison, IL
September
Weather in September
September, the first month of the autumn in Morrison, is still a warm month, with an average temperature fluctuating between 74.3°F (23.5°C) and 55°F (12.8°C).Temperature
A moderate decline in average high-temperatures is noted in September, moving from a moderately hot 79.7°F (26.5°C) in August to a still warm 74.3°F (23.5°C). An average low-temperature of 55°F (12.8°C) marks the month of September.Humidity
The average relative humidity in September is 78%.Rainfall
In Morrison, in September, it is raining for 11.9 days, with typically 2.17" (55mm) of accumulated precipitation. In Morrison, during the entire year, the rain falls for 145.1 days and collects up to 27.2" (691mm) of precipitation.Snowfall
May through September are months without snowfall in Morrison.Daylight
The average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:26 am and sunset at 7:32 pm. On the last day of September, sunrise is at 6:56 am and sunset at 6:42 pm CDT.
Sunshine
The average sunshine in September is 9.1h.UV index
In Morrison, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for average individuals.Note: A maximum high UV index of 4 in September translates into the following recommendations:
Guard yourself - An obligation to protect skin and eyes from harm exists. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Morrison, IL
- Average high temperature in September: 74.3°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (27°F).
- Average low temperature in September: 55°F
The month with the highest average low temperature is July (63.9°F).
The coldest month (with the lowest average low temperature) is January (14.5°F).
Average pressure in September
Morrison, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Morrison, IL
- Average wind speed in September: 7.6mph
The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in September
Morrison, IL
- Average humidity in September: 78%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is October (73%).
Average rainfall in September
Morrison, IL
- Average rainfall in September: 2.17"
The wettest month (with the highest rainfall) is May (4.09").
The driest month (with the least rainfall) is January (1.22").
Average rainfall days in September
Morrison, IL
- Average rainfall days in September: 11.9 days
The months with the highest number of rainy days are May and June (17.8 days).
The month with the least rainy days is February (4.8 days).
Average snowfall in September
Morrison, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (4.06").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Morrison, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Morrison, IL
- Average daylight in September: 12h and 30min
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: 9h and 6min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in September
Morrison, IL
- Average sunshine days in September: 16.4 days
The month with the most sunshine days is November (17.8 days).
The month with the least sunshine days is June (10.3 days).
Average UV index in September
Morrison, IL
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in September
Morrison, IL
- Average cloud cover in September: 31
The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is September (Cloud cover 31).
Average visibility in September
Morrison, IL
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
