Mercer Island, Washington Climate
United States
Pop. 25,042 Elev. 103 m / 338 ft
TZ: America/Los_Angeles (UTC-7) ·
Mercer Island sees mild summers peaking at 78°F (26°C) in July, and cool winters that bottom out around 36°F (2°C) in January. Precipitation occurs on roughly 78 days per year (51.5 in / 1307 mm total), with 5 in (128 mm) of annual snowfall. Overcast skies are common, with only 77 sunny days per year. Ocean water temperatures reach 61°F (16°C) in summer.
| Temperature | 78°F (26°C) high | 36°F (2°C) low |
| Feels like | 35°F (2°C) low | |
| Rain | 78 days | 51.5 in (1307 mm) /yr |
| Snow | 0 days | 5.0 in (128 mm) /yr |
| Sky | 77 sunny | 17 stormy |
| Wind | 2.4 mph (1.1 m/s) avg |
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Explore on the MapMonthly Climate Chart
Best months to visit: Apr, May, Jun, Jul, Aug, Sep
Sky & Air by Month
Cloud cover (%)
58
Jan 72
Feb 84
Mar 59
Apr 61
May 54
Jun 42
Jul 55
Aug 53
Sep 62
Oct 84
Nov 84
Dec Humidity (%)
83
Jan 80
Feb 79
Mar 70
Apr 69
May 68
Jun 64
Jul 72
Aug 76
Sep 81
Oct 86
Nov 89
Dec Weather Days by Month
Water Temperatures
Cities with Similar Climate
Find similar cities on the map →Nearby Cities
Nearby
Commercial airport 5 mi King County International Airport - Boeing Field (BFI)
Ski resort 37 mi Alpental Backcountry
National park 82 mi Mount Baker National Recreation Area
Mountain peak
(4,967 ft) 27 mi Moolock Mountain
Hospital 4 mi Overlake Medical Center
Hiking trail 3 mi Lake to Lake Trail
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Monthly Weather Data
↑ See chart| Month | Avg High | Avg Low | Rainfall | Snowfall | Sunny Days |
|---|---|---|---|---|---|
| January | 46°F 8°C | 36°F 2°C | 2.7 in 70 mm | 0.1 in3 mm | 9 |
| February | 46°F 8°C | 37°F 3°C | 5.0 in 127 mm | 4.7 in119 mm | 4 |
| March | 54°F 12°C | 43°F 6°C | 7.7 in 194 mm | 0.1 in4 mm | 1 |
| April | 60°F 16°C | 45°F 7°C | 3.5 in 90 mm | — | 7 |
| May | 66°F 19°C | 49°F 9°C | 2.5 in 65 mm | — | 7 |
| June | 71°F 22°C | 55°F 13°C | 0.8 in 20 mm | — | 10 |
| July | 78°F 26°C | 59°F 15°C | 0.2 in 6 mm | — | 16 |
| August | 77°F 25°C | 60°F 16°C | 2.4 in 60 mm | — | 9 |
| September | 73°F 23°C | 56°F 14°C | 1.1 in 27 mm | — | 8 |
| October | 60°F 15°C | 47°F 9°C | 5.8 in 147 mm | — | 5 |
| November | 54°F 12°C | 46°F 8°C | 7.9 in 201 mm | — | 0 |
| December | 50°F 10°C | 42°F 6°C | 11.9 in 301 mm | 0.1 in2 mm | 1 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 9 | 0 |
| February | 4 | 1 |
| March | 1 | 2 |
| April | 7 | 2 |
| May | 7 | 1 |
| June | 10 | 1 |
| July | 16 | 0 |
| August | 9 | 0 |
| September | 8 | 0 |
| October | 5 | 6 |
| November | 0 | 2 |
| December | 1 | 2 |
Water Temperatures Data
↑ See chart| Month | Ocean Avg High | Lake Avg High |
|---|---|---|
| January | 48°F 9°C | 42°F 5°C |
| February | 47°F 8°C | 39°F 4°C |
| March | 48°F 9°C | 41°F 5°C |
| April | 53°F 11°C | 47°F 8°C |
| May | 55°F 13°C | 55°F 13°C |
| June | 60°F 16°C | 63°F 17°C |
| July | 60°F 16°C | 69°F 20°C |
| August | 61°F 16°C | 70°F 21°C |
| September | 61°F 16°C | 68°F 20°C |
| October | 57°F 14°C | 56°F 13°C |
| November | 52°F 11°C | 50°F 10°C |
| December | 50°F 10°C | 46°F 8°C |