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July Weather in Waterloo, United States

Last updated: June 24, 2025

In July, the average temperature in Waterloo, United States reaches a warm 27°C (80°F), with a minimum dipping to 16°C (61°F) and a maximum soaring to 39°C (102°F). Expect 89 mm (3.5 in) of precipitation over 11 days, contributing to a high average humidity of 81%. Stay prepared for both the warmth and the occasional rain!

July Temperature in Waterloo

In July in Waterloo, the average temperature is 27°C (80°F), with maximums reaching 39°C (102°F) and minimums dropping as low as 16°C (61°F). Travelers should be prepared for warm days and cooler evenings, making it ideal for both outdoor activities and comfortable nights.

July Weather in Waterloo: Daily Temperature Highs, Lows, and Averages

The chart illustrates July temperature patterns in Waterloo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Waterloo, July typically has an average temperature of 27°C (80°F), with highs reaching up to 39°C (102°F) and lows dropping to around 16°C (61°F).
JanFebMarAprMayJunJulAugSepOctNovDec343748566777807772594540
Data source: Temperature data for Waterloo 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.

July Precipitation in Waterloo

In Waterloo in July, the precipitation amount is 89 mm (3.5 in) over a span of 11 days.

July Precipitation Trends in Waterloo

The chart displays monthly precipitation patterns in Waterloo, with values for each month alongside July’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how July’s conditions compare to those of other months. In Waterloo, July typically receives around 89 mm (3.5 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec79871361421498789123661097568
Data source: Precipitation data for July generated using information from the Copernicus Climate Change Service.
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July Humidity in Waterloo

In Waterloo in July, humidity is 81%. With an average temperature of 27°C (80°F), this humidity feels like a warm blanket wrapping around you, making travel feel sticky and heavy, but the vibrant atmosphere can still be invigorating, inviting moments of exploration in slower, more deliberate steps.

July Average Humidity in Waterloo

This chart illustrates the average monthly humidity levels in Waterloo, with July’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In July, average humidity in Waterloo is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%80%80%80%82%83%81%80%76%76%85%86%
Data source: Humidity data for July generated using information from the Copernicus Climate Change Service.

July UV Index in Waterloo

In Waterloo in July, 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 Waterloo.

Maximum UV Index Levels in Waterloo for July

The chart shows the monthly maximum UV Index (UVI) for Waterloo in July, 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 July, the maximum UV index in Waterloo typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101110109753
Data source: Waterloo July 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 July Weather in Waterloo Compares to Other Months

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

This table compares monthly weather conditions in Waterloo, showing how July’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)79 mm (3.1 inches)82%moderate
February Weather3°C (37°F)87 mm (3.4 inches)80%moderate
March Weather9°C (48°F)136 mm (5.4 inches)80%high
April Weather13°C (56°F)142 mm (5.6 inches)80%very high
May Weather20°C (68°F)149 mm (5.9 inches)82%very high
June Weather25°C (77°F)87 mm (3.4 inches)83%extreme
July Weather27°C (80°F)89 mm (3.5 inches)81%very high
August Weather25°C (77°F)123 mm (4.8 inches)80%very high
September Weather22°C (73°F)66 mm (2.6 inches)76%very high
October Weather15°C (60°F)109 mm (4.3 inches)76%high
November Weather7°C (45°F)75 mm (2.9 inches)85%moderate
December Weather4°C (40°F)68 mm (2.7 inches)86%moderate

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