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
Riverside's weather in September involves a mild decrease in the average high-temperature, moving down slightly from August's 84.7°F (29.3°C) to a still moderately hot 78.4°F (25.8°C). The nighttime temperature dips to a mild 59.5°F (15.3°C) on average during September.Humidity
The average relative humidity in September is 74%.Rainfall
In September, the rain falls for 11.5 days. Throughout September, 1.93" (49mm) of precipitation is accumulated. Throughout the year, there are 126.5 rainfall days, and 21.65" (550mm) of precipitation is accumulated.Snowfall
In Riverside, snow does not fall in June through September.Daylight
The average length of the day in September in Riverside is 12h and 26min.On the first day of the month, sunrise is at 6:47 am and sunset at 7:48 pm. On the last day of September, sunrise is at 7:14 am and sunset at 7:02 pm CDT.
Sunshine
The average sunshine in September is 9.4h.UV index
In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the average person.Note: The UV index of 5 during September leads to these advisories:
Exercise prevention - Protecting skin and eyes from harm is required. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Frequently asked questions
What are September temperatures in Riverside?
What is the average humidity in September in Riverside?
How much does it rain in Riverside in September?
When it does not snow in Riverside?
Does it snow in Riverside in September?
How many hours of daylight does Riverside have in September?
When are sunrise and sunset in September in Riverside?
How long on average sun shines in September in Riverside?
How high is the UV index in September in Riverside?
Average temperature in September
Riverside, MO
- Average high temperature in September: 78.4°F
The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (36.5°F).
- Average low temperature in September: 59.5°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (22.1°F).
Average pressure in September
Riverside, MO
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in September
Riverside, MO
- Average wind speed in September: 7.1mph
The windiest months (with the highest average wind speed) are February, March and April (9.8mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity in September
Riverside, MO
- Average humidity in September: 74%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (69%).
Average rainfall in September
Riverside, MO
- Average rainfall in September: 1.93"
The wettest month (with the highest rainfall) is May (3.19").
The driest month (with the least rainfall) is January (0.67").
Average rainfall days in September
Riverside, MO
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is May (17.2 days).
The month with the least rainy days is January (4.8 days).
Average snowfall in September
Riverside, MO
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.13").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Riverside, MO
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (5.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Riverside, MO
- Average daylight in September: 12h and 2min
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 2min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 5h and 6min).
Average sunshine days in September
Riverside, MO
- Average sunshine days in September: 17.4 days
The month with the most sunshine days is December (22.1 days).
The month with the least sunshine days is May (11.6 days).
Average UV index in September
Riverside, 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
Riverside, 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 25).
Average visibility in September
Riverside, 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).
Riverside, Missouri, USA
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