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September Weather in Boonville, United States

Last updated: June 24, 2025

In Boonville, United States, the average temperature in September hovers around 20°C (68°F), with a minimum dipping to 5°C (42°F) and a maximum soaring up to 41°C (106°F). Be prepared for some light rain, as the area receives approximately 4 mm (0.2 in) of precipitation over the course of 1 day. The average humidity during this time is a comfortable 68%, making it an ideal month to explore the region.

September Temperature in Boonville

In September in Boonville, the average temperature is 20°C (68°F), with maximums reaching 41°C (106°F) and minimums dropping as low as 5°C (42°F). Therefore, travelers should be prepared for a wide range of temperatures, ensuring they pack accordingly for both warm days and cooler nights.

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

The chart illustrates September temperature patterns in Boonville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Boonville, September typically has an average temperature of 20°C (68°F), with highs reaching up to 41°C (106°F) and lows dropping to around 5°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec474849545967717167605146
Data source: Temperature data for Boonville 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 Boonville

In Boonville in September, the precipitation amount is 4 mm (0.2 in) during 1 day.

September Precipitation Trends in Boonville

The chart displays monthly precipitation patterns in Boonville, 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 Boonville, September typically receives around 4 mm (0.2 inches) of precipitation spread over approximately 1 days.
JanFebMarAprMayJunJulAugSepOctNovDec164168126674521145181109
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Boonville

In Boonville in September humidity is 68%. With an average temperature of 20°C (68°F), this humidity feels like a warm embrace, making it ideal for leisurely strolls while also prompting travelers to stay hydrated and seek out refreshing breaks from the heat.

September Average Humidity in Boonville

This chart illustrates the average monthly humidity levels in Boonville, 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 Boonville is approximately 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%83%80%80%76%70%66%68%72%84%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Boonville

In Boonville in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Boonville.

Maximum UV Index Levels in Boonville for September

The chart shows the monthly maximum UV Index (UVI) for Boonville 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 Boonville typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3578111111109743
Data source: Boonville 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 Boonville Compares to Other Months

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

This table compares monthly weather conditions in Boonville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather8°C (47°F)164 mm (6.4 inches)86%moderate
February Weather9°C (48°F)168 mm (6.6 inches)84%moderate
March Weather10°C (49°F)126 mm (4.9 inches)83%high
April Weather12°C (54°F)67 mm (2.6 inches)80%very high
May Weather15°C (59°F)45 mm (1.8 inches)80%extreme
June Weather19°C (67°F)2 mm (0.1 inches)76%extreme
July Weather22°C (71°F)1 mm (0.0 inches)70%extreme
August Weather22°C (71°F)1 mm (0.0 inches)66%very high
September Weather20°C (68°F)4 mm (0.2 inches)68%very high
October Weather16°C (61°F)51 mm (2.0 inches)72%high
November Weather11°C (52°F)81 mm (3.2 inches)84%moderate
December Weather8°C (46°F)109 mm (4.3 inches)84%moderate

Compare Boonville's Climate with Cities Worldwide