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April Weather in Waterloo, United States

Last updated: June 24, 2025

In Waterloo, United States, the average temperature in April is a pleasant 17°C (62°F). Expect a range that can dip to as low as 4°C (39°F) and soar up to 34°C (93°F). During this month, you can anticipate about 44 mm (1.7 in) of precipitation over approximately 5 days, paired with an average humidity level of 78%. Stay prepared for a mix of weather while enjoying the climate!

April Temperature in Waterloo

In April in Waterloo, the average temperature is 17°C (62°F), with maximums reaching up to 34°C (93°F) and minimums dropping as low as 4°C (39°F). This pleasant range makes Waterloo an ideal destination for travelers looking to enjoy a mix of warm afternoons and cooler evenings.

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

The chart illustrates April 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, April typically has an average temperature of 17°C (62°F), with highs reaching up to 34°C (93°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec505256626874767572655549
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.

April Precipitation in Waterloo

In Waterloo in April, the precipitation amount is 44 mm (1.7 in) over the course of 5 days.

April Precipitation Trends in Waterloo

The chart displays monthly precipitation patterns in Waterloo, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In Waterloo, April typically receives around 44 mm (1.7 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec110958944202002314795
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Waterloo

In Waterloo in April, humidity is 78%. With an average temperature of 17°C (62°F), this humidity feels like a warm, enveloping blanket, making travel feel a bit sticky and heavy but also refreshing, as long as you're prepared with light clothing and plenty of water.

April Average Humidity in Waterloo

This chart illustrates the average monthly humidity levels in Waterloo, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, average humidity in Waterloo is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%84%82%78%71%64%59%54%55%62%78%80%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in Waterloo

In Waterloo in April, 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 Waterloo.

Maximum UV Index Levels in Waterloo for April

The chart shows the monthly maximum UV Index (UVI) for Waterloo in April, 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 April, the maximum UV index in Waterloo typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3588101111109643
Data source: Waterloo April 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 April 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 April’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 April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (50°F)110 mm (4.3 inches)82%moderate
February Weather11°C (52°F)95 mm (3.7 inches)84%moderate
March Weather13°C (56°F)89 mm (3.5 inches)82%very high
April Weather17°C (62°F)44 mm (1.7 inches)78%very high
May Weather20°C (68°F)20 mm (0.8 inches)71%very high
June Weather24°C (75°F)2 mm (0.1 inches)64%extreme
July Weather24°C (76°F)0 mm (0.0 inches)58%extreme
August Weather24°C (76°F)0 mm (0.0 inches)54%very high
September Weather22°C (72°F)2 mm (0.1 inches)55%very high
October Weather18°C (65°F)30 mm (1.2 inches)62%high
November Weather13°C (55°F)47 mm (1.8 inches)78%moderate
December Weather9°C (49°F)95 mm (3.7 inches)80%moderate

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