September weather forecast and climate
Olathe, KS

The first month of the autumn, September, is also a moderately hot month in Olathe, Kansas, with 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). The average low-temperature, in Olathe, is 59.5°F (15.3°C).

Humidity

The average relative humidity is 75%.

Rainfall

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

The average length of the day in Olathe is 12.4h.

Sunshine

In Olathe, the average sunshine is 9.3h.

UV index

In Olathe, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to the UV radiation for average individuals.
Note: The daily maximum UV index of 5 interpret into the following advice:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the temperature in September in Olathe?

In Olathe, in September, the average high-temperature is 78.3°F (25.7°C), and the average low-temperature is 59.5°F (15.3°C).

What is the average humidity in September in Olathe?

In September, the average relative humidity in Olathe is 75%.

How many days does it rain in September in Olathe?

In Olathe, Kansas, in September, during 12.6 rainfall days, 2.6" (66mm) of precipitation is typically accumulated.

Does it snow in Olathe in September?

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

When it does not snow in Olathe?

June through September are months without snowfall.

What is the average length of the day in September in Olathe?

In Olathe, Kansas, the average length of the day in September is 12.4h.

How many hours of sunshine does Olathe have in September?

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

What is the UV index intensity in September in Olathe?

The average daily maximum UV index in September in Olathe, Kansas, is 5. A UV Index value of 3 to 5 symbolizes a moderate health threat from unsafe exposure to the Sun's UV rays.
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"

The month with the highest atmospheric pressure is January (30.17").
The month with the lowest atmospheric pressure is June (29.89").

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%).
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").
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).
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: 12.4h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in September: 9.3h

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).

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

Months with the highest UV index are May, June, July and August (UV index 6).
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

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).