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June Weather in Waterloo, United States

Last updated: June 24, 2025

In June, the average temperature in Waterloo, United States is a pleasant 20°C (67°F). Expect lows of 5°C (41°F) and highs reaching up to 34°C (93°F). With an average humidity of 79%, you might feel a bit sticky! Be prepared for some rain as well, with about 86 mm (3.4 in) of precipitation expected over 12 days.

June Temperature in Waterloo

In June in Waterloo, the average temperature is 20°C (67°F). Maximums can reach 34°C (93°F) and minimums can be as low as 5°C (41°F). Pack for warm days and cool evenings when traveling to Waterloo during this time.

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

The chart illustrates June 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, June typically has an average temperature of 20°C (67°F), with highs reaching up to 34°C (93°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec272935465867737164544032
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.

June Precipitation in Waterloo

In Waterloo in June, the precipitation amount is 86 mm (3.4 in) over a span of 12 days.

June Precipitation Trends in Waterloo

The chart displays monthly precipitation patterns in Waterloo, with values for each month alongside June’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how June’s conditions compare to those of other months. In Waterloo, June typically receives around 86 mm (3.4 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec898881119116861531088215497101
Data source: Precipitation data for June generated using information from the Copernicus Climate Change Service.
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June Humidity in Waterloo

In Waterloo in June, humidity is 79%. With an average temperature of 20°C (67°F), this humidity feels like a warm, heavy blanket wrapping around you, making traveling a bit sluggish and requiring frequent breaks to stay refreshed.

June Average Humidity in Waterloo

This chart illustrates the average monthly humidity levels in Waterloo, with June’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In June, average humidity in Waterloo is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%87%88%82%79%78%76%78%84%89%86%
Data source: Humidity data for June generated using information from the Copernicus Climate Change Service.

June UV Index in Waterloo

In Waterloo in June, 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 June

The chart shows the monthly maximum UV Index (UVI) for Waterloo in June, 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 June, the maximum UV index in Waterloo typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24681010997632
Data source: Waterloo June 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 June 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 June’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 June’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)89 mm (3.5 inches)90%low
February Weather-2°C (29°F)88 mm (3.5 inches)90%moderate
March Weather2°C (35°F)81 mm (3.2 inches)87%high
April Weather8°C (46°F)119 mm (4.7 inches)88%very high
May Weather14°C (58°F)116 mm (4.6 inches)82%very high
June Weather20°C (67°F)86 mm (3.4 inches)79%very high
July Weather23°C (73°F)153 mm (6.0 inches)78%very high
August Weather22°C (72°F)108 mm (4.3 inches)76%very high
September Weather18°C (65°F)82 mm (3.2 inches)78%high
October Weather12°C (55°F)154 mm (6.1 inches)84%high
November Weather4°C (40°F)97 mm (3.8 inches)89%moderate
December Weather0°C (33°F)101 mm (4.0 inches)86%low

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