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September Weather in Oskaloosa, United States

Last updated: June 24, 2025

In September, the average temperature in Oskaloosa, United States is a comfortable 20°C (69°F), with a range that can dip to a minimum of 6°C (43°F) and soar to a maximum of 34°C (93°F). Expect about 122 mm (4.8 in) of rainfall spread over 9 days, contributing to an average humidity of 73%. Embrace the diverse weather while exploring this charming destination!

September Temperature in Oskaloosa

In September, in Oskaloosa, the average temperature is 20°C (69°F). The maximum can reach 34°C (93°F) and the minimum can be as low as 6°C (43°F). This range makes Oskaloosa a perfect destination for travelers seeking pleasant weather and a variety of outdoor activities.

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

The chart illustrates September temperature patterns in Oskaloosa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Oskaloosa, September typically has an average temperature of 20°C (69°F), with highs reaching up to 34°C (93°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec232541506375777469543932
Data source: Temperature data for Oskaloosa 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 Oskaloosa

In Oskaloosa in September, the precipitation amount is 122 mm (4.8 in) over a span of 9 days.

September Precipitation Trends in Oskaloosa

The chart displays monthly precipitation patterns in Oskaloosa, 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 Oskaloosa, September typically receives around 122 mm (4.8 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec4649877215513076691221285139
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Oskaloosa

In Oskaloosa in September humidity is 73%. With an average temperature of 20°C (69°F), this humidity feels like a warm embrace, making travel slightly sticky but ultimately comfortable as long as you stay hydrated and take breaks in the shade.

September Average Humidity in Oskaloosa

This chart illustrates the average monthly humidity levels in Oskaloosa, 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 Oskaloosa is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%80%77%78%77%81%81%77%73%75%85%83%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Oskaloosa

In Oskaloosa in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Oskaloosa.

Maximum UV Index Levels in Oskaloosa for September

The chart shows the monthly maximum UV Index (UVI) for Oskaloosa 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 Oskaloosa typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689111198643
Data source: Oskaloosa 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 Oskaloosa Compares to Other Months

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

This table compares monthly weather conditions in Oskaloosa, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (24°F)46 mm (1.8 inches)78%moderate
February Weather-4°C (25°F)49 mm (1.9 inches)80%moderate
March Weather5°C (41°F)87 mm (3.4 inches)77%high
April Weather10°C (50°F)72 mm (2.8 inches)77%very high
May Weather17°C (63°F)154 mm (6.1 inches)77%very high
June Weather24°C (75°F)130 mm (5.1 inches)81%extreme
July Weather25°C (78°F)76 mm (3.0 inches)81%extreme
August Weather23°C (75°F)69 mm (2.7 inches)77%very high
September Weather20°C (69°F)122 mm (4.8 inches)73%very high
October Weather12°C (54°F)128 mm (5.0 inches)75%high
November Weather4°C (40°F)51 mm (2.0 inches)85%moderate
December Weather0°C (32°F)39 mm (1.5 inches)83%moderate

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