March Weather in Sammamish, United States

Last updated: June 24, 2025

In March, the average temperature in Sammamish, United States hovers around 7°C (44°F). Expect a chill, with minimums dropping to -3°C (27°F), while the mercury can rise as high as 25°C (77°F). Be prepared for 167 mm (6.6 in) of precipitation spread across 18 days, resulting in an average humidity of 87%—perfect for those who enjoy a refreshing, moist atmosphere!

March Temperature in Sammamish

In March in Sammamish, the average temperature is 7°C (44°F). Maximums can reach 25°C (77°F) and minimums can be as low as -3°C (27°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

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

The chart illustrates March temperature patterns in Sammamish, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sammamish, March typically has an average temperature of 7°C (44°F), with highs reaching up to 25°C (77°F) and lows dropping to around -3°C (27°F).

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

March Precipitation in Sammamish

In Sammamish in March, the total precipitation amount is 167 mm (6.6 in) spread over 18 days.

March Precipitation Trends in Sammamish

The chart displays monthly precipitation patterns in Sammamish, 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 Sammamish, March typically receives around 167 mm (6.6 inches) of precipitation spread over approximately 18 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 Sammamish

In Sammamish in March, humidity is 87%. With an average temperature of 7°C (44°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities uncomfortable and requiring travelers to layer up to stay warm and dry.

March Average Humidity in Sammamish

This chart illustrates the average monthly humidity levels in Sammamish, 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 Sammamish is approximately 87%, 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 Sammamish

In Sammamish in March, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Sammamish.

Maximum UV Index Levels in Sammamish for March

The chart shows the monthly maximum UV Index (UVI) for Sammamish 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 Sammamish typically reaches 5, which falls under the moderate exposure category.

Data source: Sammamish 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 Sammamish Compares to Other Months

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

This table compares monthly weather conditions in Sammamish, showing how March’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (41°F)	215 mm (8.5 inches)	86%	low
February Weather	4°C (39°F)	242 mm (9.5 inches)	86%	moderate
March Weather	7°C (44°F)	167 mm (6.6 inches)	87%	moderate
April Weather	9°C (49°F)	154 mm (6.1 inches)	84%	high
May Weather	13°C (56°F)	94 mm (3.7 inches)	81%	very high
June Weather	16°C (60°F)	88 mm (3.5 inches)	82%	very high
July Weather	18°C (65°F)	33 mm (1.3 inches)	79%	very high
August Weather	18°C (65°F)	27 mm (1.0 inches)	63%	very high
September Weather	15°C (60°F)	124 mm (4.9 inches)	62%	high
October Weather	10°C (50°F)	220 mm (8.7 inches)	83%	moderate
November Weather	7°C (45°F)	238 mm (9.4 inches)	89%	low
December Weather	4°C (40°F)	248 mm (9.8 inches)	88%	low