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
September is characterized by a mild reduction in the average high-temperature, from a tropical 87.3°F (30.7°C) in August to a moderately hot 79.9°F (26.6°C). Nighttime temperatures hover around an average low of 59.9°F (15.5°C) in September.Humidity
In Brookline, the average relative humidity in September is 74%.Rainfall
In Brookline, in September, during 11.6 rainfall days, 2.2" (56mm) of precipitation is typically accumulated. Throughout the year, there are 149.3 rainfall days, and 34.45" (875mm) of precipitation is accumulated.Snowfall
In Brookline, snow does not fall in June through October.Daylight
The average length of the day in September in Brookline, Missouri, is 12h and 25min.On the first day of the month, sunrise is at 6:44 am and sunset at 7:41 pm. On the last day of September, sunrise is at 7:08 am and sunset at 6:57 pm CDT.
Sunshine
In Brookline, the average sunshine in September is 9.4h.UV index
The average daily maximum UV index in September in Brookline, Missouri, is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for average individuals.Note: The UV index of 5 during September translates into the following guidance:
Exercise prevention - Protecting skin and eyes from harm is required. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Boost your sun resistance with garments that are densely woven yet spacious.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September in Brookline?
What is the average humidity in September in Brookline?
How many days does it rain in September in Brookline?
When it does not snow in Brookline?
What is the average length of the day in September in Brookline?
When is the sunrise / sunset in September in Brookline?
How many hours of sunshine does Brookline have in September?
What is the UV index reading in September in Brookline?
Average temperature in September
Brookline, MO
- Average high temperature in September: 79.9°F
The warmest month (with the highest average high temperature) is July (88.7°F).
The month with the lowest average high temperature is January (42.3°F).
- Average low temperature in September: 59.9°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 (26.4°F).
Average pressure in September
Brookline, MO
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Brookline, MO
- Average wind speed in September: 6.7mph
The windiest month (with the highest average wind speed) is March (9.8mph).
The calmest month (with the lowest average wind speed) is July (6.2mph).
Average humidity in September
Brookline, MO
- Average humidity in September: 74%
The month with the highest relative humidity is May (78%).
The months with the lowest relative humidity are July, August and October (73%).
Average rainfall in September
Brookline, MO
- Average rainfall in September: 2.2"
The wettest month (with the highest rainfall) is May (5.16").
The driest month (with the least rainfall) is February (1.69").
Average rainfall days in September
Brookline, MO
- Average rainfall days in September: 11.6 days
The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is January (7.2 days).
Average snowfall in September
Brookline, MO
- Average snowfall in September: 0"
The month with the highest snowfall is January (2.09").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
Brookline, 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
Brookline, MO
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 5h and 12min).
Average sunshine days in September
Brookline, MO
- Average sunshine days in September: 16.4 days
The month with the most sunshine days is December (20.6 days).
The month with the least sunshine days is July (12.1 days).
Average UV index in September
Brookline, MO
- Average UV index in September: 5
The months with the highest UV index are May, 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
Brookline, MO
- Average cloud cover in September: 30
The month with the most cloud cover is March (Cloud cover 48).
The months with the least cloud cover are July and August (Cloud cover 27).
Average visibility in September
Brookline, 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).
Brookline, Missouri, USA
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