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January Weather in Waterloo, United States

Last updated: June 24, 2025

In January, the average temperature in Waterloo, United States is a chilly -3°C (27°F). Expect a wide range of temperatures, with a minimum of -20°C (-5°F) and a maximum reaching 16°C (61°F). Prepare for wet conditions as well, with 89 mm (3.5 in) of precipitation spread over 14 days. The average humidity sits at a damp 90%, making for a crisp atmosphere.

January Temperature in Waterloo

In January in Waterloo, the average temperature is -3°C (27°F), with maximums reaching 16°C (61°F) and minimums plummeting to as low as -20°C (-5°F). Expect a wide range of temperatures, so pack accordingly for your travels!

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

The chart illustrates January 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, January typically has an average temperature of -3°C (27°F), with highs reaching up to 16°C (61°F) and lows dropping to around -20°C (-5°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.

January Precipitation in Waterloo

In Waterloo in January, the precipitation amount is 89 mm (3.5 in) over a span of 14 days.

January Precipitation Trends in Waterloo

The chart displays monthly precipitation patterns in Waterloo, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Waterloo, January typically receives around 89 mm (3.5 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec898881119116861531088215497101
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Waterloo

In Waterloo in January humidity is 90%. With an average temperature of -3°C (27°F), this humidity feels like a bitter chill that seeps into your bones, making travel uncomfortable and necessitating extra layers to combat both the cold and the dampness in the air.

January Average Humidity in Waterloo

This chart illustrates the average monthly humidity levels in Waterloo, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Waterloo is approximately 90%, 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 January generated using information from the Copernicus Climate Change Service.

January UV Index in Waterloo

In Waterloo in January, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Waterloo, you can visit Hourly UV Index in Waterloo.

Maximum UV Index Levels in Waterloo for January

The chart shows the monthly maximum UV Index (UVI) for Waterloo in January, 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 January, the maximum UV index in Waterloo typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24681010997632
Data source: Waterloo January 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 January 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 January’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 January’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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