March Weather in Riverhead, United States

Last updated: June 24, 2025

In March, the average temperature in Riverhead, United States hovers around 4°C (40°F), with minimums dipping to a chilly -8°C (18°F) and maximums reaching a comfortable 18°C (64°F). Expect about 101 mm (4.0 in) of precipitation spread over 9 days, and prepare for a humid atmosphere with an average humidity of 81%.

March Temperature in Riverhead

In March in Riverhead, the average temperature is 4°C (40°F). Maximum temperatures can reach 18°C (64°F), while minimums can drop as low as -8°C (18°F). It's essential to pack layers and be prepared for chilly weather during your travels.

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

The chart illustrates March temperature patterns in Riverhead, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Riverhead, March typically has an average temperature of 4°C (40°F), with highs reaching up to 18°C (64°F) and lows dropping to around -8°C (18°F).

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

March Precipitation in Riverhead

In Riverhead in March, the total precipitation amount is 101 mm (4.0 in), occurring over a span of 9 days.

March Precipitation Trends in Riverhead

The chart displays monthly precipitation patterns in Riverhead, 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 Riverhead, March typically receives around 101 mm (4.0 inches) of precipitation spread over approximately 9 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

March Humidity in Riverhead

In Riverhead in March humidity is 81%. With an average temperature of 4°C (40°F), this humidity feels like a damp chill that can make traveling quite uncomfortable, as the cold air clings uncomfortably to your skin and the moisture can quickly sap your body heat.

March Average Humidity in Riverhead

This chart illustrates the average monthly humidity levels in Riverhead, 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 Riverhead is approximately 81%, 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 Riverhead

In Riverhead 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 Riverhead, you can refer to this Hourly UV Index in Riverhead.

Maximum UV Index Levels in Riverhead for March

The chart shows the monthly maximum UV Index (UVI) for Riverhead 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 Riverhead typically reaches 6, which falls under the high exposure category.

Data source: Riverhead 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 Riverhead Compares to Other Months

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

This table compares monthly weather conditions in Riverhead, showing how March’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	2°C (36°F)	79 mm (3.1 inches)	84%	moderate
February Weather	2°C (37°F)	106 mm (4.2 inches)	82%	moderate
March Weather	4°C (40°F)	101 mm (4.0 inches)	81%	high
April Weather	9°C (49°F)	126 mm (5.0 inches)	78%	very high
May Weather	14°C (58°F)	114 mm (4.5 inches)	69%	very high
June Weather	20°C (68°F)	76 mm (3.0 inches)	69%	very high
July Weather	24°C (75°F)	117 mm (4.6 inches)	62%	very high
August Weather	24°C (75°F)	96 mm (3.8 inches)	65%	very high
September Weather	21°C (70°F)	89 mm (3.5 inches)	68%	very high
October Weather	16°C (61°F)	139 mm (5.5 inches)	74%	high
November Weather	9°C (49°F)	100 mm (3.9 inches)	82%	moderate
December Weather	5°C (41°F)	137 mm (5.4 inches)	80%	low