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 27 Apr, 2025 Weather in Mercer Island

Sunrise: 05:58 AM Sunset: 08:16 PM	Moonrise: 05:36 AM Moonset: 08:50 PM	Max: 12.1 °c	Min: 7.5 °c	Avg: 9.8 °c	Precip: 0.00 mm	Max Wind: 13.3 kph

	Sun 27 0:00 am	Sun 27 3:00 am	Sun 27 6:00 am	Sun 27 9:00 am	Sun 27 12:00 pm	Sun 27 3:00 pm	Sun 27 6:00 pm	Sun 27 9:00 pm
Icon
Temp	9.6°c	8.1°c	7.6°c	8.1°c	9.4°c	11.3°c	12.1°c	11.7°c
Wind	10.8 kmph	10.8 kmph	9.0 kmph	9.7 kmph	9.7 kmph	11.2 kmph	11.5 kmph	12.6 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	96%	94%	94%	100%	92%	69%	77%	100%
Humidity	75%	80%	82%	80%	76%	70%	69%	73%
Pressure	1014 mb	1015 mb	1017 mb	1018 mb	1019 mb	1020 mb	1020 mb	1022 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 / 35°F	4°C / 40°F	115 hours	179.06 mm / 7.05 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	110.88 mm / 4.37 In	10 days	1017 mb / 31 In
May	18°C / 65°F	8°C / 46°F	13°C / 55°F	168 hours	78.82 mm / 3.10 In	8 days	1017 mb / 30 In
June	21°C / 70°F	10°C / 50°F	16°C / 60°F	183 hours	56.75 mm / 2.23 In	6 days	1016 mb / 30 In
July	26°C / 78°F	13°C / 56°F	19°C / 67°F	260 hours	15.88 mm / 0.63 In	2 days	1017 mb / 31 In
August	26°C / 78°F	14°C / 57°F	19°C / 67°F	268 hours	24.39 mm / 0.96 In	3 days	1016 mb / 30 In
September	22°C / 71°F	11°C / 52°F	16°C / 61°F	207 hours	75.70 mm / 2.98 In	6 days	1016 mb / 30 In
October	16°C / 60°F	8°C / 46°F	11°C / 52°F	164 hours	144.34 mm / 5.68 In	10 days	1017 mb / 31 In
November	10°C / 50°F	4°C / 39°F	7°C / 44°F	110 hours	204.06 mm / 8.03 In	14 days	1017 mb / 31 In
December	7°C / 44°F	2°C / 35°F	4°C / 39°F	103 hours	189.12 mm / 7.45 In	13 days	1018 mb / 31 In

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