Mercer Island Weather History Washington, United States of America

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Daily and hourly data from 1 Jan 2009 onwards.
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Sun 01 Feb, 2026 Weather in Mercer Island

Sunrise: 07:35 AM Sunset: 05:11 PM	Moonrise: 05:07 PM Moonset: 07:47 AM	Max: 10.3 °c	Min: 9.1 °c	Avg: 9.7 °c	Precip: 0.00 mm	Max Wind: 16.6 kph

	Sun 01 0:00 am	Sun 01 3:00 am	Sun 01 6:00 am	Sun 01 9:00 am	Sun 01 12:00 pm	Sun 01 3:00 pm	Sun 01 6:00 pm	Sun 01 9:00 pm
Icon
Temp	10.3°c	9.9°c	9.2°c	9.4°c	10.1°c	10.0°c	9.5°c	9.3°c
Wind	5.4 kmph	5.4 kmph	5.4 kmph	6.8 kmph	15.5 kmph	10.4 kmph	11.2 kmph	10.4 kmph
Precip	0.00 mm	0.00 mm	0.00 mm	0.00 mm	0.00 mm	0.00 mm	0.00 mm	0.00 mm
Cloud	76%	73%	73%	83%	83%	97%	94%	89%
Humidity	67%	66%	64%	67%	70%	77%	87%	87%
Pressure	1016 mb	1014 mb	1014 mb	1015 mb	1015 mb	1017 mb	1018 mb	1020 mb

Mercer Island Annual Weather Averages

Month	High Temp	Low Temp	Avg Temp	Sunshine Hours	Rainfall	Rain days	Pressure
January	7°C / 45°F	2°C / 36°F	4°C / 40°F	114 hours	177.96 mm / 7.01 In	12 days	1019 mb / 31 In
February	8°C / 46°F	2°C / 35°F	4°C / 40°F	90 hours	136.04 mm / 5.36 In	12 days	1018 mb / 31 In
March	11°C / 51°F	3°C / 37°F	6°C / 44°F	100 hours	153.31 mm / 6.04 In	13 days	1016 mb / 30 In
April	14°C / 57°F	5°C / 40°F	9°C / 48°F	116 hours	112.73 mm / 4.44 In	10 days	1017 mb / 31 In
May	18°C / 65°F	8°C / 46°F	13°C / 55°F	165 hours	77.67 mm / 3.06 In	8 days	1017 mb / 31 In
June	21°C / 70°F	10°C / 51°F	16°C / 60°F	180 hours	54.95 mm / 2.16 In	5 days	1016 mb / 30 In
July	26°C / 78°F	13°C / 56°F	19°C / 67°F	257 hours	14.95 mm / 0.59 In	2 days	1017 mb / 31 In
August	26°C / 78°F	14°C / 57°F	19°C / 67°F	261 hours	27.32 mm / 1.08 In	3 days	1016 mb / 30 In
September	22°C / 71°F	11°C / 53°F	16°C / 61°F	204 hours	72.93 mm / 2.87 In	6 days	1016 mb / 30 In
October	15°C / 60°F	8°C / 46°F	11°C / 52°F	162 hours	145.03 mm / 5.71 In	10 days	1017 mb / 31 In
November	10°C / 50°F	4°C / 40°F	7°C / 44°F	106 hours	211.99 mm / 8.35 In	14 days	1017 mb / 31 In
December	7°C / 44°F	2°C / 35°F	4°C / 39°F	98 hours	197.89 mm / 7.79 In	13 days	1018 mb / 31 In

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