Mercer Island, Washington, United States Climate
Weather: 10.43°C/50.77°F, Wind SW at 3.13 km/h, 86% Humidity, 0% Chance of rain
Mercer Island Climate Summary
Located at an elevation of 103.33 meters (339.01 feet) above sea level, Mercer Island has a Mediterranean, warm summer climate (Classification: Csb). The district’s yearly temperature is 12.47ºC (54.45ºF) and it is -0.17% lower than United States’s averages. Mercer Island typically receives about 75.9 millimeters (2.99 inches) of precipitation and has 144.55 rainy days (39.6% of the time) annually.
Country | United States |
City | Washington |
Longitude | -122.2220674 |
Latitude | 47.5706548 |
Attitude/Elevation | 103.33m (339.01ft) |
Local time | Saturday 14:41 |
Annual high temperature | 15.76ºC (60.37ºF) |
Annual low temperature | 6.42ºC (43.56ºF) |
Average annual precip. | 75.9mm (2.99in) |
Warmest month | August (26.26ºC / 79.27ºF) |
Coldest Month | February (1.68ºC / 35.02ºF) |
Wettest Month | December (119.55mm / 4.71in) |
Driest Month | July (16.43mm / 0.65in) |
Number of days with rainfall (≥ 1.0 mm) | 144.55 days (39.6%) |
Days with no rain | 220.45 days (60.4%) |
Humidity | 77.98% |
Climate Mercer Island: Weather By Month
Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Nov | Oct | Dec | Year |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Record high °C (°F) | 16.0(60.8) | 17.0(62.6) | 26.0(78.8) | 29.0(84.2) | 30.0(86.0) | 33.0(91.4) | 37.0(98.6) | 38.0(100.4) | 36.0(96.8) | 29.0(84.2) | 21.0(69.8) | 14.0(57.2) | 38.0(100.4) |
Average high °C (°F) | 7.7(45.86) | 8.29(46.92) | 11.04(51.87) | 14.02(57.24) | 19.11(66.4) | 21.39(70.5) | 25.84(78.51) | 26.26(79.27) | 22.38(72.28) | 16.12(61.02) | 10.06(50.11) | 6.93(44.47) | 15.76(60.37) |
Daily mean °C (°F) | 5.09(41.16) | 5.57(42.03) | 7.92(46.26) | 10.73(51.31) | 15.76(60.37) | 18.25(64.85) | 21.95(71.51) | 21.88(71.38) | 18.1(64.58) | 12.56(54.61) | 7.35(45.23) | 4.47(40.05) | 12.47(54.45) |
Average low °C (°F) | 2.03(35.65) | 1.68(35.02) | 3.05(37.49) | 4.67(40.41) | 7.24(45.03) | 9.06(48.31) | 11.84(53.31) | 12.83(55.09) | 11.17(52.11) | 7.68(45.82) | 4.1(39.38) | 1.74(35.13) | 6.42(43.56) |
Record low °C (°F) | -10.0(14.0) | -10.0(14.0) | -4.0(24.8) | -3.0(26.6) | -2.0(28.4) | 2.0(35.6) | 4.0(39.2) | 4.0(39.2) | 4.0(39.2) | -1.0(30.2) | -12.0(10.4) | -8.0(17.6) | -12.0(10.4) |
Average precipitation mm (inches) | 119.5(4.7) | 96.89(3.81) | 100.69(3.96) | 82.69(3.26) | 51.28(2.02) | 41.89(1.65) | 16.43(0.65) | 22.02(0.87) | 51.72(2.04) | 96.39(3.79) | 111.71(4.4) | 119.55(4.71) | 75.9(2.99) |
Average precipitation days (≥ 1.0 mm) | 17.0 | 14.82 | 16.73 | 14.45 | 10.82 | 10.09 | 3.73 | 3.82 | 9.36 | 13.09 | 15.91 | 14.73 | 12.05 |
Average relative humidity (%) | 84.0 | 84.09 | 81.66 | 79.08 | 74.54 | 73.74 | 69.29 | 70.11 | 73.95 | 78.35 | 82.57 | 84.4 | 77.98 |
Mean monthly sunshine hours | 6.24 | 6.46 | 9.41 | 12.04 | 13.12 | 13.32 | 13.79 | 13.45 | 11.42 | 7.33 | 6.46 | 6.11 | 9.93 |
Climate Graph
The chart below shows the mean monthly temperature and precipitation of Washington in recent years.
Mercer Island Temperature by Month
July | 21.95°C | 71.51°F | |
August | 21.88°C | 71.38°F | |
June | 18.25°C | 64.85°F | |
September | 18.1°C | 64.58°F | |
May | 15.76°C | 60.37°F | |
October | 12.56°C | 54.61°F | |
April | 10.73°C | 51.31°F | |
March | 7.92°C | 46.26°F | |
November | 7.35°C | 45.23°F | |
February | 5.57°C | 42.03°F | |
January | 5.09°C | 41.16°F | |
December | 4.47°C | 40.05°F |
Historical Data
Temperature | Max | Average | Min | |
---|---|---|---|---|
Max Temperature | 36.0°C (96.8°F) | 25.3°C (77.54°F) | 16.0°C (60.8°F) | |
Avg Temperature | 29.0°C (84.2°F) | 20.73°C (69.31°F) | 14.0°C (57.2°F) | |
Min Temperature | 19.0°C (66.2°F) | 14.23°C (57.61°F) | 10.0°C (50.0°F) | |
Dew Point | Max | Average | Min | |
Dew Point | 15.0°C (59.0°F) | 10.83°C (51.49°F) | -0.0°C (0°F) | |
Precipitation | Max | Average | Min | Sum |
Precipitation | 22.8mm | 0.9in | 1.4mm | 0.06in | 0.0mm | 0in | 42.1mm | 1.66in |
Snowdepth | 0.0mm | 0in | 0.0mm | 0in | 0.0mm | 0in | 0.0mm | 0in |
Wind | Max | Average | Min | |
Wind | 19.0kmh | 11.81mph | 6.83kmh | 4.24mph | 3.0kmh | 1.86mph | |
Gust Wind | 30.0kmh | 18.64mph | 10.0kmh | 6.21mph | 4.0kmh | 2.49mph | |
Sea Level Pressure | Max | Average | Min | |
Sea Level Pressure | 22.8mb | 1.4mb | 0.0mb |
Daily Observations
Time | Temperature | Dew Point | Humidity | Wind Speed | Pressure | Precipitation |
---|---|---|---|---|---|---|
September | ° C | ° F | ° C | ° F | % | Kph | Mph | Hg | Mb | Total (mm/in) |
2020-09-01 | 22 | 71.6 | 12 | 53.6 | 63 | 6 | 3.73 | 30.0 | 1016 | 0.0 | 0.0 |
2020-09-02 | 23 | 73.4 | 13 | 55.4 | 67 | 6 | 3.73 | 30.0 | 1016 | 0.0 | 0.0 |
2020-09-03 | 22 | 71.6 | 12 | 53.6 | 63 | 8 | 4.97 | 30.03 | 1017 | 0.0 | 0.0 |
2020-09-04 | 25 | 77.0 | 13 | 55.4 | 59 | 5 | 3.11 | 30.0 | 1016 | 0.0 | 0.0 |
2020-09-05 | 21 | 69.8 | 13 | 55.4 | 71 | 6 | 3.73 | 30.12 | 1020 | 0.0 | 0.0 |
2020-09-06 | 21 | 69.8 | 12 | 53.6 | 70 | 8 | 4.97 | 30.18 | 1022 | 0.0 | 0.0 |
2020-09-07 | 21 | 69.8 | 10 | 50.0 | 60 | 9 | 5.59 | 30.12 | 1020 | 0.0 | 0.0 |
2020-09-08 | 22 | 71.6 | -0 | 32.0 | 27 | 11 | 6.84 | 30.24 | 1024 | 0.0 | 0.0 |
2020-09-09 | 26 | 78.8 | 3 | 37.4 | 28 | 6 | 3.73 | 30.0 | 1016 | 0.0 | 0.0 |
2020-09-10 | 29 | 84.2 | 6 | 42.8 | 32 | 4 | 2.49 | 29.94 | 1014 | 0.0 | 0.0 |
2020-09-11 | 26 | 78.8 | 9 | 48.2 | 42 | 5 | 3.11 | 29.97 | 1015 | 0.0 | 0.0 |
2020-09-12 | 25 | 77.0 | 13 | 55.4 | 58 | 4 | 2.49 | 29.91 | 1013 | 0.0 | 0.0 |
2020-09-13 | 20 | 68.0 | 11 | 51.8 | 64 | 6 | 3.73 | 29.91 | 1013 | 0.0 | 0.0 |
2020-09-14 | 21 | 69.8 | 11 | 51.8 | 63 | 3 | 1.86 | 29.94 | 1014 | 0.0 | 0.0 |
2020-09-15 | 24 | 75.2 | 12 | 53.6 | 55 | 4 | 2.49 | 30.06 | 1018 | 0.0 | 0.0 |
2020-09-16 | 25 | 77.0 | 14 | 57.2 | 62 | 5 | 3.11 | 30.0 | 1016 | 0.0 | 0.0 |
2020-09-17 | 22 | 71.6 | 15 | 59.0 | 76 | 5 | 3.11 | 29.94 | 1014 | 0.0 | 0.0 |
2020-09-18 | 16 | 60.8 | 14 | 57.2 | 86 | 6 | 3.73 | 29.91 | 1013 | 0.8 | 0.03 |
2020-09-19 | 16 | 60.8 | 13 | 55.4 | 88 | 6 | 3.73 | 29.97 | 1015 | 1.4 | 0.06 |
2020-09-20 | 19 | 66.2 | 12 | 53.6 | 76 | 5 | 3.11 | 30.03 | 1017 | 0.6 | 0.02 |
2020-09-21 | 18 | 64.4 | 10 | 50.0 | 70 | 5 | 3.11 | 29.94 | 1014 | 0.1 | 0.0 |
2020-09-22 | 19 | 66.2 | 11 | 51.8 | 70 | 7 | 4.35 | 29.94 | 1014 | 0.5 | 0.02 |
2020-09-23 | 15 | 59.0 | 12 | 53.6 | 83 | 11 | 6.84 | 29.83 | 1010 | 22.8 | 0.9 |
2020-09-24 | 16 | 60.8 | 11 | 51.8 | 78 | 19 | 11.81 | 29.83 | 1010 | 3.3 | 0.13 |
2020-09-25 | 15 | 59.0 | 10 | 50.0 | 79 | 15 | 9.32 | 29.8 | 1009 | 9.1 | 0.36 |
2020-09-26 | 14 | 57.2 | 9 | 48.2 | 78 | 8 | 4.97 | 30.06 | 1018 | 3.4 | 0.13 |
2020-09-27 | 16 | 60.8 | 9 | 48.2 | 75 | 5 | 3.11 | 30.36 | 1028 | 0.1 | 0.0 |
2020-09-28 | 18 | 64.4 | 10 | 50.0 | 70 | 8 | 4.97 | 30.27 | 1025 | 0.0 | 0.0 |
2020-09-29 | 21 | 69.8 | 12 | 53.6 | 68 | 6 | 3.73 | 30.09 | 1019 | 0.0 | 0.0 |
2020-09-30 | 24 | 75.2 | 13 | 55.4 | 58 | 3 | 1.86 | 30.15 | 1021 | 0.0 | 0.0 |
Mercer Island 11 Year Historical Weather Data
- Mercer Island, Washington weather in September 2019
- Mercer Island, Washington weather in September 2018
- Mercer Island, Washington weather in September 2017
- Mercer Island, Washington weather in September 2016
- Mercer Island, Washington weather in September 2015
- Mercer Island, Washington weather in September 2014
- Mercer Island, Washington weather in September 2013
- Mercer Island, Washington weather in September 2012
- Mercer Island, Washington weather in September 2011
- Mercer Island, Washington weather in September 2010
Nearby locations
- Columbia City 5.00 km ( 3.11 mi)
- Newcastle 5.83 km ( 3.62 mi)
- Mid - Beacon Hill 6.27 km ( 3.89 mi)
- Seattle 9.17 km ( 5.70 mi)
- Renton 10.17 km ( 6.32 mi)
- Belltown 10.45 km ( 6.49 mi)
- Kirkland 11.87 km ( 7.38 mi)
- East Renton Highlands 12.62 km ( 7.84 mi)
- Fremont 13.37 km ( 8.31 mi)
- Sammamish 14.91 km ( 9.27 mi)
- Ballard 17.25 km ( 10.72 mi)
- Kenmore 20.97 km ( 13.03 mi)
- Cottage Lake 22.15 km ( 13.77 mi)
- Shoreline 22.60 km ( 14.04 mi)
- Maple Valley 24.07 km ( 14.96 mi)
- Bothell West 26.12 km ( 16.23 mi)
- Lakeland North 27.22 km ( 16.91 mi)
- Auburn 29.28 km ( 18.19 mi)
- Mill Creek East 32.21 km ( 20.01 mi)
- Mill Creek 32.21 km ( 20.01 mi)
- Lakeland South 33.55 km ( 20.85 mi)
- Puyallup 43.17 km ( 26.82 mi)
- Enumclaw 44.30 km ( 27.53 mi)
- University Place 44.74 km ( 27.80 mi)
- Lakewood 49.68 km ( 30.87 mi)
- Elk Plain 59.05 km ( 36.69 mi)
- Camano 70.88 km ( 44.05 mi)
- Olympia 78.37 km ( 48.70 mi)
- Mount Vernon 94.84 km ( 58.93 mi)
- Bellingham 132.73 km ( 82.47 mi)
- Ellensburg 141.83 km ( 88.13 mi)
- Ferndale 144.49 km ( 89.78 mi)
- Longview 168.35 km ( 104.61 mi)
- Hazel Dell 213.80 km ( 132.85 mi)
- Moses Lake 227.75 km ( 141.52 mi)
- Grandview 229.70 km ( 142.73 mi)
- Walla Walla 340.03 km ( 211.29 mi)
- Cheney 349.95 km ( 217.45 mi)
- Spokane Valley 374.65 km ( 232.80 mi)
- View all
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