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March Weather in Grinnell, United States

Last updated: June 24, 2025

In Grinnell, United States, the average temperature in March hovers around 4°C (39°F). However, be prepared for a wide range, as temperatures can dip to a brisk -22°C (-7°F) or rise to a pleasant 22°C (73°F). Expect about 79 mm (3.1 in) of precipitation spread over 9 days, contributing to an average humidity of 77%. Always come prepared for the surprises this month can bring!

March Temperature in Grinnell

In March in Grinnell, the average temperature is 4°C (39°F). The maximum can reach 22°C (73°F), while the minimum can drop to as low as -22°C (-7°F). Be prepared for a wide range of temperatures, making it essential to pack layers for your travels.

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

The chart illustrates March 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, March typically has an average temperature of 4°C (39°F), with highs reaching up to 22°C (73°F) and lows dropping to around -22°C (-7°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.

March Precipitation in Grinnell

In Grinnell in March, the precipitation amount is 79 mm (3.1 in) spread over 9 days.

March Precipitation Trends in Grinnell

The chart displays monthly precipitation patterns in Grinnell, with values for each month alongside March’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how March’s conditions compare to those of other months. In Grinnell, March typically receives around 79 mm (3.1 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec4348798116613381721181454638
Data source: Precipitation data for March generated using information from the Copernicus Climate Change Service.
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March Humidity in Grinnell

In Grinnell in March, humidity is 77%. With an average temperature of 4°C (39°F), this humidity feels like a brisk chill that seeps into your bones, making travel feel invigorating yet uncomfortable without proper layers to stay warm and dry.

March Average Humidity in Grinnell

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

March UV Index in Grinnell

In Grinnell in March, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Grinnell, you can refer to this Hourly UV Index in Grinnell.

Maximum UV Index Levels in Grinnell for March

The chart shows the monthly maximum UV Index (UVI) for Grinnell in March, 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 March, the maximum UV index in Grinnell typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689111098643
Data source: Grinnell March 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 March 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 March’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 March’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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