Mercer Island, Washington, United States Climate

Weather: 11.33°C/52.39°F, Wind SW at 6.69 km/h, 75% Humidity, 0% Chance of rain

United States
(Photo by Ryan Stone on Unsplash)
Contents

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.

CountryUnited States
CityWashington
Longitude-122.2220674
Latitude47.5706548
Attitude/Elevation103.33m (339.01ft)
Local timeWednesday 21:37
Annual high temperature15.76ºC (60.37ºF)
Annual low temperature6.42ºC (43.56ºF)
Average annual precip.75.9mm (2.99in)
Warmest monthAugust (26.26ºC / 79.27ºF)
Coldest MonthFebruary (1.68ºC / 35.02ºF)
Wettest MonthDecember (119.55mm / 4.71in)
Driest MonthJuly (16.43mm / 0.65in)
Number of days with rainfall (≥ 1.0 mm)144.55 days (39.6%)
Days with no rain220.45 days (60.4%)
Humidity77.98%

Climate Mercer Island: Weather By Month

MonthJanFebMarAprMayJunJulAugSepNovOctDecYear
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)17.014.8216.7314.4510.8210.093.733.829.3613.0915.9114.7312.05
Average relative humidity (%)84.084.0981.6679.0874.5473.7469.2970.1173.9578.3582.5784.477.98
Mean monthly sunshine hours6.246.469.4112.0413.1213.3213.7913.4511.427.336.466.119.93

Climate Graph

The chart below shows the mean monthly temperature and precipitation of Mercer Island in recent years.

Mercer Island

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

Summary
  • 2020
  • 2019
  • 2018
  • 2017
  • 2016
  • 2015
  • 2014
  • 2013
  • 2012
  • 2011
  • 2010
  • January
  • February
  • March
  • April
  • May
  • June
  • July
  • August
  • September
  • October
  • November
  • December
TemperatureMaxAverageMin
Max Temperature36.0°C (96.8°F)25.3°C (77.54°F)16.0°C (60.8°F)
Avg Temperature29.0°C (84.2°F)20.73°C (69.31°F)14.0°C (57.2°F)
Min Temperature19.0°C (66.2°F)14.23°C (57.61°F)10.0°C (50.0°F)
Dew PointMaxAverageMin
Dew Point15.0°C (59.0°F)10.83°C (51.49°F)-0.0°C (0°F)
PrecipitationMaxAverageMinSum
Precipitation22.8mm | 0.9in1.4mm | 0.06in0.0mm | 0in42.1mm | 1.66in
Snowdepth0.0mm | 0in0.0mm | 0in0.0mm | 0in0.0mm | 0in
WindMaxAverageMin
Wind19.0kmh | 11.81mph6.83kmh | 4.24mph3.0kmh | 1.86mph
Gust Wind30.0kmh | 18.64mph10.0kmh | 6.21mph4.0kmh | 2.49mph
Sea Level PressureMaxAverageMin
Sea Level Pressure22.8mb1.4mb0.0mb
Mercer Island

Daily Observations

TimeTemperatureDew PointHumidityWind SpeedPressurePrecipitation
September° C | ° F° C | ° F%Kph | MphHg | MbTotal (mm/in)
2020-09-0122 | 71.612 | 53.6636 | 3.7330.0 | 10160.0 | 0.0
2020-09-0223 | 73.413 | 55.4676 | 3.7330.0 | 10160.0 | 0.0
2020-09-0322 | 71.612 | 53.6638 | 4.9730.03 | 10170.0 | 0.0
2020-09-0425 | 77.013 | 55.4595 | 3.1130.0 | 10160.0 | 0.0
2020-09-0521 | 69.813 | 55.4716 | 3.7330.12 | 10200.0 | 0.0
2020-09-0621 | 69.812 | 53.6708 | 4.9730.18 | 10220.0 | 0.0
2020-09-0721 | 69.810 | 50.0609 | 5.5930.12 | 10200.0 | 0.0
2020-09-0822 | 71.6-0 | 32.02711 | 6.8430.24 | 10240.0 | 0.0
2020-09-0926 | 78.83 | 37.4286 | 3.7330.0 | 10160.0 | 0.0
2020-09-1029 | 84.26 | 42.8324 | 2.4929.94 | 10140.0 | 0.0
2020-09-1126 | 78.89 | 48.2425 | 3.1129.97 | 10150.0 | 0.0
2020-09-1225 | 77.013 | 55.4584 | 2.4929.91 | 10130.0 | 0.0
2020-09-1320 | 68.011 | 51.8646 | 3.7329.91 | 10130.0 | 0.0
2020-09-1421 | 69.811 | 51.8633 | 1.8629.94 | 10140.0 | 0.0
2020-09-1524 | 75.212 | 53.6554 | 2.4930.06 | 10180.0 | 0.0
2020-09-1625 | 77.014 | 57.2625 | 3.1130.0 | 10160.0 | 0.0
2020-09-1722 | 71.615 | 59.0765 | 3.1129.94 | 10140.0 | 0.0
2020-09-1816 | 60.814 | 57.2866 | 3.7329.91 | 10130.8 | 0.03
2020-09-1916 | 60.813 | 55.4886 | 3.7329.97 | 10151.4 | 0.06
2020-09-2019 | 66.212 | 53.6765 | 3.1130.03 | 10170.6 | 0.02
2020-09-2118 | 64.410 | 50.0705 | 3.1129.94 | 10140.1 | 0.0
2020-09-2219 | 66.211 | 51.8707 | 4.3529.94 | 10140.5 | 0.02
2020-09-2315 | 59.012 | 53.68311 | 6.8429.83 | 101022.8 | 0.9
2020-09-2416 | 60.811 | 51.87819 | 11.8129.83 | 10103.3 | 0.13
2020-09-2515 | 59.010 | 50.07915 | 9.3229.8 | 10099.1 | 0.36
2020-09-2614 | 57.29 | 48.2788 | 4.9730.06 | 10183.4 | 0.13
2020-09-2716 | 60.89 | 48.2755 | 3.1130.36 | 10280.1 | 0.0
2020-09-2818 | 64.410 | 50.0708 | 4.9730.27 | 10250.0 | 0.0
2020-09-2921 | 69.812 | 53.6686 | 3.7330.09 | 10190.0 | 0.0
2020-09-3024 | 75.213 | 55.4583 | 1.8630.15 | 10210.0 | 0.0

Mercer Island 11 Year Historical Weather Data

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