March Weather in Keys, United States

Last updated: June 24, 2025

In Keys, United States, the average temperature in March is 12°C (54°F). Expect a range between a chilly -12°C (11°F) and a warm 32°C (91°F). During this time, the region sees an impressive 134 mm (5.3 in) of precipitation over 13 days, contributing to an average humidity of 75%. Plan accordingly to stay comfortable!

March Temperature in Keys

In March in Keys, the average temperature is 12°C (54°F). The maximum can reach 32°C (91°F) and the minimum can be as low as -12°C (11°F). Be prepared for a wide range of temperatures when traveling during this time.

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

The chart illustrates March temperature patterns in Keys, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Keys, March typically has an average temperature of 12°C (54°F), with highs reaching up to 32°C (91°F) and lows dropping to around -12°C (11°F).

Data source: Temperature data for Keys generated using information from the Copernicus Climate Change Service.

March Precipitation in Keys

In Keys in March, the precipitation amount is 134 mm (5.3 in) recorded over the course of 13 days.

March Precipitation Trends in Keys

The chart displays monthly precipitation patterns in Keys, 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 Keys, March typically receives around 134 mm (5.3 inches) of precipitation spread over approximately 13 days.

Data source: Precipitation data for March generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

March Humidity in Keys

In Keys in March, humidity is 75%. With an average temperature of 12°C (54°F), this humidity feels like a damp chill that seeps into your bones, making it essential to layer your clothing for comfort while exploring.

March Average Humidity in Keys

This chart illustrates the average monthly humidity levels in Keys, 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 Keys is approximately 75%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for March generated using information from the Copernicus Climate Change Service.

March UV Index in Keys

In Keys in March, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Keys.

Maximum UV Index Levels in Keys for March

The chart shows the monthly maximum UV Index (UVI) for Keys 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 Keys typically reaches 7, which falls under the high exposure category.

Data source: Keys 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 Keys Compares to Other Months

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

This table compares monthly weather conditions in Keys, showing how March’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (40°F)	89 mm (3.5 inches)	79%	moderate
February Weather	6°C (42°F)	100 mm (4.0 inches)	78%	high
March Weather	12°C (54°F)	134 mm (5.3 inches)	75%	high
April Weather	15°C (59°F)	158 mm (6.2 inches)	75%	very high
May Weather	21°C (69°F)	212 mm (8.3 inches)	83%	very high
June Weather	26°C (78°F)	78 mm (3.1 inches)	81%	extreme
July Weather	28°C (82°F)	105 mm (4.1 inches)	78%	extreme
August Weather	26°C (80°F)	129 mm (5.1 inches)	68%	very high
September Weather	24°C (76°F)	78 mm (3.1 inches)	64%	very high
October Weather	17°C (62°F)	153 mm (6.0 inches)	71%	high
November Weather	10°C (50°F)	66 mm (2.6 inches)	82%	moderate
December Weather	7°C (45°F)	83 mm (3.3 inches)	87%	moderate