February Weather in Mercer Island, United States

Last updated: June 24, 2025

In February, the average temperature in Mercer Island, United States hovers around 5°C (41°F). This cool season can see temperatures dipping to a brisk -10°C (14°F) and occasionally rising to a comfortable 14°C (58°F). With 177 mm (7.0 in) of precipitation spread over 19 days, you can expect a fair amount of rain. Coupled with an average humidity level of 86%, the atmosphere is certainly brisk and invigorating!

February Temperature in Mercer Island

In February in Mercer Island, the average temperature is 5°C (41°F), with maximums reaching up to 14°C (58°F) and minimums dropping as low as -10°C (14°F). Travelers should prepare for a wide range of temperatures and pack accordingly to enjoy their visit comfortably.

February Weather in Mercer Island: Daily Temperature Highs, Lows, and Averages

The chart illustrates February temperature patterns in Mercer Island, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mercer Island, February typically has an average temperature of 5°C (41°F), with highs reaching up to 14°C (58°F) and lows dropping to around -10°C (14°F).

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

February Precipitation in Mercer Island

In Mercer Island in February, the total precipitation amount is 177 mm (7.0 in) over the course of 19 days.

February Precipitation Trends in Mercer Island

The chart displays monthly precipitation patterns in Mercer Island, with values for each month alongside February’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how February’s conditions compare to those of other months. In Mercer Island, February typically receives around 177 mm (7.0 inches) of precipitation spread over approximately 19 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

February Humidity in Mercer Island

In Mercer Island in February humidity is 86%. With an average temperature of 5°C (41°F), this humidity feels like a heavy, damp blanket wrapping around you, making outdoor activities uncomfortable and travel quite challenging due to the chill combined with the stickiness in the air.

February Average Humidity in Mercer Island

This chart illustrates the average monthly humidity levels in Mercer Island, with February’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In February, average humidity in Mercer Island is approximately 86%, offering insight into how humid the weather typically is during this month.

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

February UV Index in Mercer Island

In Mercer Island in February, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Mercer Island, you can check the information here.

Maximum UV Index Levels in Mercer Island for February

The chart shows the monthly maximum UV Index (UVI) for Mercer Island in February, 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 February, the maximum UV index in Mercer Island typically reaches 3, which falls under the moderate exposure category.

Data source: Mercer Island February 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 February Weather in Mercer Island Compares to Other Months

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

This table compares monthly weather conditions in Mercer Island, showing how February’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	6°C (43°F)	175 mm (6.9 inches)	86%	low
February Weather	5°C (41°F)	177 mm (7.0 inches)	86%	moderate
March Weather	7°C (46°F)	126 mm (4.9 inches)	87%	moderate
April Weather	10°C (50°F)	117 mm (4.6 inches)	84%	high
May Weather	14°C (57°F)	68 mm (2.7 inches)	81%	very high
June Weather	17°C (62°F)	63 mm (2.5 inches)	82%	very high
July Weather	19°C (67°F)	18 mm (0.7 inches)	79%	very high
August Weather	19°C (67°F)	16 mm (0.6 inches)	63%	very high
September Weather	16°C (62°F)	100 mm (3.9 inches)	62%	high
October Weather	11°C (52°F)	155 mm (6.1 inches)	83%	moderate
November Weather	8°C (47°F)	181 mm (7.1 inches)	89%	low
December Weather	6°C (42°F)	196 mm (7.7 inches)	88%	low