September weather forecast
Olathe, KS

Weather in September

September, the first month of the autumn in Olathe, is still a warm month, with an average temperature varying between 59.5°F (15.3°C) and 78.3°F (25.7°C).

Temperature

In September, the average high-temperature marginally drops from a moderately hot 85.1°F (29.5°C) in August to a still warm 78.3°F (25.7°C). In September, in Olathe, the average low-temperature is 59.5°F (15.3°C).

Humidity

The average relative humidity in September is 75%.

Rainfall

In September, the rain falls for 12.6 days. Throughout September, 2.6" (66mm) of precipitation is accumulated. In Olathe, during the entire year, the rain falls for 137 days and collects up to 28.7" (729mm) of precipitation.

Snowfall

June through September are months without snowfall.

Daylight

In Olathe, the average length of the day in September is 12h and 26min.
On the first day of September, sunrise is at 6:48 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 7:03 pm CDT.

Sunshine

In Olathe, the average sunshine in September is 9.3h.

UV index

In September, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 5 in September transform into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the average humidity in September in Olathe?

In September, the average relative humidity is 75%.

How many days does it rain in September in Olathe?

In Olathe, Kansas, during September, the rain falls for 12.6 days and regularly aggregates up to 2.6" (66mm) of precipitation.

When it does not snow in Olathe?

In Olathe, Kansas, snow does not fall in June through September.

Does it snow in Olathe in September?

In Olathe, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does Olathe have in September?

The average day length in September is 12h and 26min.

When are sunrise and sunset in September in Olathe?

On the first day of September in Olathe, sunrise is at 6:48 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 7:03 pm CDT.

How many hours of sunshine does Olathe have in September?

The average sunshine duration in September in Olathe, Kansas, is 9.3h.

What is the UV index reading in September in Olathe?

In September, the average daily maximum UV index in Olathe is 5. A UV Index estimate of 3 to 5 represents a medium health risk from exposure to the Sun's UV radiation.

Average temperature in September
Olathe, KS

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).

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Average pressure in September
Olathe, KS

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).

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Average wind speed in September
Olathe, KS

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).

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Average humidity in September
Olathe, KS

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%).

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Average rainfall in September
Olathe, KS

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").

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Average rainfall days in September
Olathe, KS

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).

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Average snowfall in September
Olathe, KS

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").

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Average snowfall days in September
Olathe, KS

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).

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Average daylight in September /
Average sunshine in September
Olathe, KS

Average daylight in September / Average sunshine in September - Olathe, KS
  • Average daylight in September: 12h and 26min

The month with the longest days is June (Average daylight: 14h and 51min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in September: 9.3h

The months with the most sunshine are June and July (Average sunshine: 10.5h).
The month with the least sunshine is January (Average sunshine: 5.3h).

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Average sunshine days in September
Olathe, KS

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).

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Average UV index in September
Olathe, KS

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).

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Average cloud cover in September
Olathe, KS

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).

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Average visibility in September
Olathe, KS

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).

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