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August Weather in Ottumwa, United States

Last updated: June 24, 2025

In August, the average temperature in Ottumwa, United States is a pleasant 24°C (75°F). You can expect minimum temperatures to drop to 12°C (53°F) and may soar up to a sweltering 37°C (100°F). This month, you’re likely to encounter 75 mm (3.0 in) of rainfall over 7 days, accompanied by an average humidity of 77%.

August Temperature in Ottumwa

In August in Ottumwa, the average temperature is 24°C (75°F), with maximums reaching 37°C (100°F) and minimums dropping to as low as 12°C (53°F). Be prepared for warm days while enjoying comfortable evenings during your travels.

August Weather in Ottumwa: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in Ottumwa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ottumwa, August typically has an average temperature of 24°C (75°F), with highs reaching up to 37°C (100°F) and lows dropping to around 12°C (53°F).
JanFebMarAprMayJunJulAugSepOctNovDec242641506375787569544033
Data source: Temperature data for Ottumwa 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.

August Precipitation in Ottumwa

In Ottumwa in August, the precipitation amount is 75 mm (3.0 in) over a span of 7 days.

August Precipitation Trends in Ottumwa

The chart displays monthly precipitation patterns in Ottumwa, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Ottumwa, August typically receives around 75 mm (3.0 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec5050937715113774751291255340
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Ottumwa

In Ottumwa in August humidity is 77%. With an average temperature of 24°C (75°F), this humidity feels like a warm, enveloping blanket that can make outdoor activities feel stifling and may require frequent breaks to stay hydrated while exploring.

August Average Humidity in Ottumwa

This chart illustrates the average monthly humidity levels in Ottumwa, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Ottumwa is approximately 77%, 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 August generated using information from the Copernicus Climate Change Service.

August UV Index in Ottumwa

In Ottumwa in August, 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 Ottumwa.

Maximum UV Index Levels in Ottumwa for August

The chart shows the monthly maximum UV Index (UVI) for Ottumwa in August, 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 August, the maximum UV index in Ottumwa typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689111098643
Data source: Ottumwa August 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 August Weather in Ottumwa Compares to Other Months

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

This table compares monthly weather conditions in Ottumwa, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (24°F)50 mm (2.0 inches)78%moderate
February Weather-3°C (27°F)50 mm (2.0 inches)80%moderate
March Weather5°C (41°F)93 mm (3.7 inches)77%high
April Weather10°C (51°F)77 mm (3.0 inches)77%very high
May Weather17°C (64°F)151 mm (5.9 inches)77%very high
June Weather24°C (75°F)137 mm (5.4 inches)81%extreme
July Weather25°C (78°F)74 mm (2.9 inches)81%very high
August Weather24°C (75°F)75 mm (3.0 inches)77%very high
September Weather21°C (69°F)129 mm (5.1 inches)73%very high
October Weather12°C (54°F)125 mm (4.9 inches)75%high
November Weather4°C (40°F)53 mm (2.1 inches)85%moderate
December Weather0°C (33°F)40 mm (1.6 inches)83%moderate

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