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September Weather in Olathe, United States

Last updated: June 24, 2025

In Olathe, United States, the average temperature in September hovers around 18°C (64°F), with temperatures ranging from a chilly -1°C (31°F) to a balmy 35°C (94°F). Expect 19 mm (0.7 in) of precipitation spread over 3 days, and enjoy a comfortable average humidity of 53%.

September Temperature in Olathe

In September in Olathe, the average temperature is 18°C (64°F), with maximums reaching 35°C (94°F) and minimums dropping as low as -1°C (31°F). Travelers should be prepared for a wide range of temperatures, from warm days to potentially chilly nights.

September Weather in Olathe: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Olathe, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Olathe, September typically has an average temperature of 18°C (64°F), with highs reaching up to 35°C (94°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec252938485769747264483826
Data source: Temperature data for Olathe generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Olathe

In Olathe in September, the precipitation amount is 19 mm (0.7 in) over a period of 3 days.

September Precipitation Trends in Olathe

The chart displays monthly precipitation patterns in Olathe, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Olathe, September typically receives around 19 mm (0.7 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec304648312813201219392232
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Olathe

In Olathe in September humidity is 53%. With an average temperature of 18°C (64°F), this humidity feels like a comfortable embrace, allowing for enjoyable outdoor exploration and leisurely strolls without overwhelming heat or discomfort.

September Average Humidity in Olathe

This chart illustrates the average monthly humidity levels in Olathe, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Olathe is approximately 53%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%89%81%74%58%47%39%39%53%72%84%90%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Olathe

In Olathe in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Olathe.

Maximum UV Index Levels in Olathe for September

The chart shows the monthly maximum UV Index (UVI) for Olathe in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Olathe typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec469101112121110754
Data source: Olathe September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Olathe Compares to Other Months

Weather in Olathe varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Olathe, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Olathe, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)30 mm (1.2 inches)90%moderate
February Weather-2°C (29°F)46 mm (1.8 inches)89%high
March Weather3°C (38°F)48 mm (1.9 inches)81%very high
April Weather9°C (48°F)31 mm (1.2 inches)74%very high
May Weather14°C (58°F)28 mm (1.1 inches)58%extreme
June Weather21°C (70°F)13 mm (0.5 inches)47%extreme
July Weather23°C (74°F)20 mm (0.8 inches)39%extreme
August Weather22°C (72°F)12 mm (0.5 inches)39%extreme
September Weather18°C (64°F)19 mm (0.7 inches)53%very high
October Weather9°C (48°F)39 mm (1.5 inches)72%high
November Weather3°C (38°F)22 mm (0.9 inches)84%moderate
December Weather-3°C (26°F)32 mm (1.3 inches)90%moderate

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