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April Weather in Grinnell, United States

Last updated: June 24, 2025

In April, the average temperature in Grinnell, United States hovers around 9°C (49°F). Expect a range of conditions, with lows dipping to a crisp -10°C (14°F) and highs reaching up to a warm 29°C (85°F). During this month, you can anticipate 81 mm (3.2 in) of precipitation spread over about 10 days, contributing to an average humidity of 77%. Prepare accordingly for a mix of weather!

April Temperature in Grinnell

In April in Grinnell, the average temperature is 9°C (49°F). The maximum can reach 29°C (85°F), while the minimum can drop to as low as -10°C (14°F). Be prepared for a wide range of temperatures when traveling during this month.

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

The chart illustrates April temperature patterns in Grinnell, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grinnell, April typically has an average temperature of 9°C (49°F), with highs reaching up to 29°C (85°F) and lows dropping to around -10°C (14°F).
JanFebMarAprMayJunJulAugSepOctNovDec222339496273767368523830
Data source: Temperature data for Grinnell 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 Grinnell

In Grinnell in April, the precipitation amount is 81 mm (3.2 in) over a span of 10 days.

April Precipitation Trends in Grinnell

The chart displays monthly precipitation patterns in Grinnell, 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 Grinnell, April typically receives around 81 mm (3.2 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec4348798116613381721181454638
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Grinnell

In Grinnell in April humidity is 77%. With an average temperature of 9°C (49°F), this humidity feels like a damp chill that seeps into your bones, making outdoor explorations feel colder and more uncomfortable than the thermometer suggests.

April Average Humidity in Grinnell

This chart illustrates the average monthly humidity levels in Grinnell, 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 Grinnell 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 April generated using information from the Copernicus Climate Change Service.

April UV Index in Grinnell

In Grinnell 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 Grinnell.

Maximum UV Index Levels in Grinnell for April

The chart shows the monthly maximum UV Index (UVI) for Grinnell 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 Grinnell typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689111098643
Data source: Grinnell 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 Grinnell Compares to Other Months

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

This table compares monthly weather conditions in Grinnell, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)43 mm (1.7 inches)78%moderate
February Weather-5°C (23°F)48 mm (1.9 inches)80%moderate
March Weather4°C (39°F)79 mm (3.1 inches)77%high
April Weather9°C (49°F)81 mm (3.2 inches)77%very high
May Weather17°C (62°F)166 mm (6.5 inches)77%very high
June Weather23°C (74°F)133 mm (5.2 inches)81%extreme
July Weather24°C (76°F)81 mm (3.2 inches)81%very high
August Weather23°C (73°F)71 mm (2.8 inches)77%very high
September Weather20°C (68°F)118 mm (4.7 inches)73%very high
October Weather11°C (53°F)145 mm (5.7 inches)75%high
November Weather3°C (38°F)46 mm (1.8 inches)85%moderate
December Weather-1°C (31°F)38 mm (1.5 inches)83%moderate

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