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
Transitioning from August to September involves a subtle drop in average high-temperatures, descending from a moderately hot 78.1°F (25.6°C) to a pleasant 72.7°F (22.6°C). During September, the average low-temperature in Seward, Illinois, is a fresh 54.3°F (12.4°C).Humidity
In Seward, Illinois, the average relative humidity in September is 80%.Rainfall
In September, in Seward, the rain falls for 7.7 days. Throughout September, 0.63" (16mm) of precipitation is accumulated. In Seward, Illinois, during the entire year, the rain falls for 100.6 days and collects up to 7.99" (203mm) of precipitation.Snowfall
In Seward, snow does not fall in May through September.Daylight
The average length of the day in September in Seward is 12h and 28min.On the first day of the month, sunrise is at 6:23 am and sunset at 7:30 pm. On the last day of September, in Seward, sunrise is at 6:54 am and sunset at 6:40 pm CDT.
Sunshine
The average sunshine in September is 8.7h.UV index
In Seward, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: An average maximum UV index of 4 in September leads to these recommendations:
Undertake precautions - Guarding against sun damage is counselled. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.
Frequently asked questions
What is the usual temperature for Seward in September?
What is the average humidity in September in Seward?
How many days does it rain in September in Seward?
When it does not snow in Seward?
Does it snow in Seward in September?
What is the average length of the day in September in Seward?
When is the sunrise / sunset in September in Seward?
How long on average sun shines in September in Seward?
How high is the UV index in September in Seward?
Average temperature in September
Seward, IL
- Average high temperature in September: 72.7°F
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (26.2°F).
- Average low temperature in September: 54.3°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (14°F).
Average pressure in September
Seward, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Seward, IL
- Average wind speed in September: 7.4mph
The windiest month (with the highest average wind speed) is April (10.2mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity in September
Seward, IL
- Average humidity in September: 80%
The month with the highest relative humidity is January (86%).
The months with the lowest relative humidity are April and October (75%).
Average rainfall in September
Seward, IL
- Average rainfall in September: 0.63"
The wettest month (with the highest rainfall) is May (1.18").
The driest months (with the least rainfall) are January and February (0.35").
Average rainfall days in September
Seward, IL
- Average rainfall days in September: 7.7 days
The month with the highest number of rainy days is May (13.8 days).
The month with the least rainy days is January (3.2 days).
Average snowfall in September
Seward, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.42").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Seward, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.1 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
Seward, 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 4min
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 42min).
Average sunshine days in September
Seward, IL
- Average sunshine days in September: 20 days
The month with the most sunshine days is December (22.6 days).
The month with the least sunshine days is June (12.8 days).
Average UV index in September
Seward, IL
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Seward, IL
- Average cloud cover in September: 33
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is September (Cloud cover 33).
Average visibility in September
Seward, 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).
Seward, Illinois, USA
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