March Weather in Alpharetta, United States

Last updated: June 24, 2025

In March, the average temperature in Alpharetta, United States hovers around 13°C (56°F), offering a mild yet variable climate. Visitors should be prepared for a temperature range that dips to a chilly -5°C (24°F) at night and can climb to a warm 29°C (84°F) during the day. With 142 mm (5.6 in) of precipitation over approximately 13 days, rain is a common guest, making an average humidity level of 83% a notable feature of the month.

March Temperature in Alpharetta

In March in Alpharetta, the average temperature is 13°C (56°F). Maximum temperatures can reach 29°C (84°F), while minimums can drop as low as -5°C (24°F). Be prepared for a wide range of weather conditions when planning your trip.

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

The chart illustrates March temperature patterns in Alpharetta, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Alpharetta, March typically has an average temperature of 13°C (56°F), with highs reaching up to 29°C (84°F) and lows dropping to around -5°C (24°F).

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

March Precipitation in Alpharetta

In Alpharetta in March, the precipitation amount is 142 mm (5.6 in) spread over 13 days.

March Precipitation Trends in Alpharetta

The chart displays monthly precipitation patterns in Alpharetta, 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 Alpharetta, March typically receives around 142 mm (5.6 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 Alpharetta

In Alpharetta in March humidity is 83%. With an average temperature of 13°C (56°F), this humidity feels like a damp blanket wrapping around you, making travel a bit uncomfortable as the air feels heavy and the moisture clings to your skin.

March Average Humidity in Alpharetta

This chart illustrates the average monthly humidity levels in Alpharetta, 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 Alpharetta is approximately 83%, 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 Alpharetta

In Alpharetta in March, 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 Alpharetta.

Maximum UV Index Levels in Alpharetta for March

The chart shows the monthly maximum UV Index (UVI) for Alpharetta 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 Alpharetta typically reaches 8, which falls under the very high exposure category.

Data source: Alpharetta 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 Alpharetta Compares to Other Months

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

This table compares monthly weather conditions in Alpharetta, showing how March’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	7°C (45°F)	112 mm (4.4 inches)	86%	moderate
February Weather	10°C (50°F)	160 mm (6.3 inches)	84%	high
March Weather	13°C (56°F)	142 mm (5.6 inches)	83%	very high
April Weather	16°C (62°F)	129 mm (5.1 inches)	81%	very high
May Weather	21°C (71°F)	116 mm (4.6 inches)	81%	extreme
June Weather	24°C (76°F)	134 mm (5.3 inches)	81%	extreme
July Weather	26°C (79°F)	118 mm (4.7 inches)	83%	extreme
August Weather	25°C (78°F)	156 mm (6.1 inches)	81%	very high
September Weather	23°C (74°F)	115 mm (4.5 inches)	82%	very high
October Weather	18°C (65°F)	140 mm (5.5 inches)	78%	very high
November Weather	11°C (52°F)	83 mm (3.3 inches)	86%	high
December Weather	9°C (48°F)	141 mm (5.5 inches)	89%	moderate