September weather forecastOlathe, KS
September
Weather in September
September initiates the transition to fall in Olathe. A notable drop in temperature from the summer months brings cooler and more comfortable days. Despite the shift, September enjoys a fair amount of sunlight with 9.3 daily sunshine hours. The reduction in heat, coupled with the stunning transformation of foliage, turns the city into a seasonal spectacle. As the month concludes, temperatures continue to cool down, leading to the more crisp and chilly days of October.Temperature
The arrival of September corresponds with a light shift in temperature, down from 85.1°F (29.5°C) in August to a still moderately hot 78.3°F (25.7°C). September nights in Olathe experience a consistent temperature drop to a mild 59.5°F (15.3°C).Humidity
In September, the average relative humidity in Olathe, Kansas, is 75%.Rainfall
In Olathe, in September, during 12.6 rainfall days, 2.6" (66mm) of precipitation is typically accumulated. In Olathe, during the entire year, the rain falls for 137 days and collects up to 28.7" (729mm) of precipitation.Snowfall
In Olathe, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 26min.On the first day of the month, sunrise is at 6:48 am and sunset at 7:49 pm. On the last day of September, sunrise is at 7:14 am and sunset at 7:03 pm CDT.
Sunshine
The average sunshine in September in Olathe, Kansas, is 9.3h.UV index
In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for average individuals.Note: A maximum high daily UV index of 5 during September translates into the following directions:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Olathe, KS
- Average high temperature in September: 78.3°F
The warmest month (with the highest average high temperature) is July (87.1°F).
The month with the lowest average high temperature is January (37.6°F).
- Average low temperature in September: 59.5°F
The month with the highest average low temperature is July (69.3°F).
The coldest month (with the lowest average low temperature) is January (23°F).
Average pressure in September
Olathe, KS
- 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
Olathe, KS
- Average wind speed in September: 7.3mph
The windiest month (with the highest average wind speed) is March (10.2mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).
Average humidity in September
Olathe, KS
- Average humidity in September: 75%
The month with the highest relative humidity is May (79%).
The months with the lowest relative humidity are October and November (70%).
Average rainfall in September
Olathe, KS
- Average rainfall in September: 2.6"
The wettest month (with the highest rainfall) is May (4.69").
The driest month (with the least rainfall) is January (1.06").
Average rainfall days in September
Olathe, KS
- Average rainfall days in September: 12.6 days
The month with the highest number of rainy days is May (17.9 days).
The month with the least rainy days is February (5.8 days).
Average snowfall in September
Olathe, KS
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.78").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Olathe, KS
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (6.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Olathe, KS
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 9h and 18min
The months with the most sunshine are June and July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 5h and 18min).
Average sunshine days in September
Olathe, KS
- Average sunshine days in September: 15.1 days
The month with the most sunshine days is December (20.9 days).
The month with the least sunshine days is May (11.2 days).
Average UV index in September
Olathe, KS
- 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
Olathe, KS
- Average cloud cover in September: 28
The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 25).
Average visibility in September
Olathe, KS
- 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).
