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
In September, the average high-temperature marginally decreases from a warm 83.8°F (28.8°C) in August to a still moderately hot 77.5°F (25.3°C). Union Star's nighttime temperature in September falls to an average of 57.9°F (14.4°C).Humidity
The average relative humidity in September is 75%.Rainfall
In Union Star, during September, the rain falls for 12.2 days and regularly aggregates up to 2.4" (61mm) of precipitation. Throughout the year, in Union Star, there are 132.3 rainfall days, and 27.28" (693mm) of precipitation is accumulated.Snowfall
In Union Star, snow does not fall in June through September.Daylight
In Union Star, the average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:46 am and sunset at 7:49 pm. On the last day of September, sunrise is at 7:14 am and sunset at 7:01 pm CDT.
Sunshine
In Union Star, the average sunshine in September is 9.3h.UV index
In Union Star, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for average individuals.Note: The daily high UV index of 5 during September translates into the following recommendations:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Union Star have in September?
When are sunrise and sunset in September in Union Star?
How long on average sun shines in September?
What is the UV index intensity in September?
Average temperature in September
Union Star, MO
- Average high temperature in September: 77.5°F
The warmest month (with the highest average high temperature) is July (85.5°F).
The month with the lowest average high temperature is January (34.2°F).
- Average low temperature in September: 57.9°F
The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (20.3°F).
Average pressure in September
Union Star, MO
- Average pressure in September: 30"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Union Star, MO
- Average wind speed in September: 7.4mph
The windiest months (with the highest average wind speed) are February and March (9.9mph).
The calmest month (with the lowest average wind speed) is July (6.4mph).
Average humidity in September
Union Star, MO
- Average humidity in September: 75%
The month with the highest relative humidity is June (79%).
The months with the lowest relative humidity are October and November (70%).
Average rainfall in September
Union Star, MO
- Average rainfall in September: 2.4"
The wettest month (with the highest rainfall) is May (4.02").
The driest months (with the least rainfall) are January and February (0.94").
Average rainfall days in September
Union Star, MO
- Average rainfall days in September: 12.2 days
The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is January (3.8 days).
Average snowfall in September
Union Star, MO
- Average snowfall in September: 0"
The month with the highest snowfall is January (3.43").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Union Star, MO
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (7.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Union Star, MO
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 48min).
Average sunshine days in September
Union Star, MO
- Average sunshine days in September: 16.3 days
The month with the most sunshine days is November (21.1 days).
The month with the least sunshine days is June (10.8 days).
Average UV index in September
Union Star, MO
- 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
Union Star, MO
- Average cloud cover in September: 29
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 27).
Average visibility in September
Union Star, MO
- 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).
Union Star, Missouri, USA
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