Mercer Island Weather Conditions
Current Temperature Level
Mercer Island Weather Conditions
Current Temperature Level
Feels Like 17°C
Chances of Rain25%
17°25%9 AM
18°17%10 AM
20°9%11 AM
22°6%12 PM24°4%1 PM26°3%2 PM30°2%3 PM31°1%4 PM31°1%5 PM30°1%6 PM29°1%7 PM28°1%8 PM25°2%9 PM
20°2%10 PM18°4%11 PM17°6%12 AM17°7%1 AM16°9%2 AM15°20%3 AM15°17%4 AM14°13%5 AM14°13%6 AM14°14%7 AM14°13%Skies may remain grey and overcast.
Last Updated: 2026-08-18 08:00 (Local Time)
200°SSW
Direction
6.8km/h
Wind Speed
Gust Speed
3m/s
Precipitation
Precipitation
0mm
Pressure
1020mb
UV Index
0.6Low
Today
22
°C
66%Wednesday
21
°C60%Thursday
22
°C54%Friday
23
°C54%Saturday
18
°C70%Sunday
19
°C62%Monday
21
°C58%Tuesday
21
°C56%Wednesday
19
°C67%Thursday
19
°C68%Sunny
Clear Sky with temperature at 22 °C and humidity will be at 66% with 15.1 km/h winds.31°C / 16°C
Humi.66 %
Prec.0 mm
Sunrise
06:09 AM14hrs 7min
Sunset
08:16 PMTime
Condition
Temp
Humidity
UV
Wind Speed & Dir.
12 AM
Overcast
18 °C
75 %
0
2.9 kmph / SSW
Overcast
Feels 19 °C
Cover 100 %
Visibility 10 km
1 AM
Overcast
18 °C
75 %
0
4.3 kmph / SSW
OvercastFeels 18 °C
Cover 100 %
Visibility 10 km
2 AM
Overcast
17 °C
77 %
0
5.8 kmph / SSW
OvercastFeels 17 °C
Cover 100 %
Visibility 10 km
3 AM
Partly Cloudy
17 °C
80 %
0
6.5 kmph / SSW
Partly CloudyFeels 17 °C
Cover 56 %
Visibility 10 km
4 AM
Overcast
17 °C
90 %
0
4.7 kmph / SSW
OvercastFeels 17 °C
Cover 100 %
Visibility 10 km
5 AM
Overcast
16 °C
89 %
0
3.6 kmph / SW
OvercastFeels 17 °C
Cover 96 %
Visibility 10 km
6 AM
Cloudy
16 °C
90 %
0
2.9 kmph / SW
CloudyFeels 16 °C
Cover 87 %
Visibility 10 km
7 AM
Overcast
16 °C
91 %
0.2
5 kmph / SSW
OvercastFeels 16 °C
Cover 100 %
Visibility 10 km
8 AM
Overcast
17 °C
86 %
0.6
6.8 kmph / SSW
OvercastFeels 17 °C
Cover 92 %
Visibility 10 km
9 AM
Cloudy
18 °C
80 %
1.4
7.2 kmph / SSW
CloudyFeels 18 °C
Cover 70 %
Visibility 10 km
10 AM
Partly Cloudy
20 °C
74 %
3
7.9 kmph / SSW
Partly CloudyFeels 20 °C
Cover 28 %
Visibility 10 km
11 AM
Sunny
22 °C
67 %
4.6
7.6 kmph / SSW
SunnyFeels 23 °C
Cover 14 %
Visibility 10 km
12 PM
Sunny
24 °C
60 %
6
7.6 kmph / SW
SunnyFeels 25 °C
Cover 6 %
Visibility 10 km
1 PM
Sunny
26 °C
54 %
6.7
8.6 kmph / SW
SunnyFeels 27 °C
Cover 15 %
Visibility 10 km
2 PM
Sunny
30 °C
49 %
6.3
8.6 kmph / SW
SunnyFeels 30 °C
Cover 7 %
Visibility 10 km
3 PM
Sunny
31 °C
45 %
5.4
8.6 kmph / SW
SunnyFeels 31 °C
Cover 3 %
Visibility 10 km
4 PM
Sunny
31 °C
44 %
3.8
9.4 kmph / SW
SunnyFeels 31 °C
Cover 3 %
Visibility 10 km
5 PM
Sunny
30 °C
42 %
2.1
10.8 kmph / WSW
SunnyFeels 30 °C
Cover 5 %
Visibility 10 km
6 PM
Sunny
29 °C
42 %
0.9
13.3 kmph / WSW
SunnyFeels 29 °C
Cover 2 %
Visibility 10 km
7 PM
Sunny
28 °C
43 %
0.3
15.1 kmph / WSW
SunnyFeels 28 °C
Cover 5 %
Visibility 10 km
8 PM
Sunny
25 °C
51 %
0
12.6 kmph / WSW
SunnyFeels 24 °C
Cover 2 %
Visibility 10 km
9 PM
Clear
20 °C
53 %
0
10.4 kmph / SW
ClearFeels 18 °C
Cover 0 %
Visibility 10 km
10 PM
Clear
18 °C
64 %
0
8.6 kmph / SW
ClearFeels 17 °C
Cover 0 %
Visibility 10 km
11 PM
Clear
17 °C
70 %
0
8.6 kmph / SSW
ClearFeels 16 °C
Cover 1 %
Visibility 10 km
24°15°21°12°26°11°27°13°30°13°
30°14°29°15°28°15°25°13°24°13°26°13°26°14°27°14°27°14°29°15°25°15°26°13°29°14°28°13°30°15°27°16°21°13°25°13°28°14°26°14°25°14°25°14°25°14°
23°14°23°13°22°13°AugustWeather Overview
No. of days:
Sunny
21
Cloudy
0
Rainy
7
Snowy
0
The monthly weather averages in Mercer Island consist of 21 sunny days, 0 cloudy days, 7 rainy days, and 0 snowy days.
Mercer Island's Locations Weather Conditions
United States's Hottest Cities - August 2026
1.
Park Village, California
38 °C
Sunny
14%
1.2
3.6 kmph / N
2.
Indio, California
37 °C
Sunny
16%
1.1
14 kmph / NW
3.
North Shore, California
37 °C
Sunny
16%
1.2
14 kmph / NW
4.
Mecca, California
37 °C
Sunny
16%
1.2
14 kmph / NW
5.
Dania Beach, Florida
37 °C
Sunny
55%
6.6
12.2 kmph / WNW
6.
Fort Lauderdale, Florida
37 °C
Sunny
55%
6.6
12.2 kmph / WNW
7.
Royal Palm Beach, Florida
37 °C
Sunny
53%
6.6
14.8 kmph / WNW
8.
Lantana, Florida
37 °C
Sunny
54%
6.6
10.8 kmph / NW
9.
Merrimon, North Carolina
36 °C
Sunny
62%
6.4
7.9 kmph / WNW
10.
Albany, Georgia
36 °C
Sunny
52%
5.3
11.9 kmph / WNW
Last Updated: 18 Aug 2026, 03:35 PM
City Weather RankingsFAQs About Mercer Island Weather Conditions
1. What is the current temperature in Mercer Island today - 18 August 2026?
1. What is the current temperature in Mercer Island today - 18 August 2026?
The current temperature in Mercer Island is 17°C, with a feels-like temperature of 17°C. Today's forecast shows a high of 31°C and a low of 16°C, giving a 15 degree swing through the day as of 08:00 AM 18 August 2026.
2. What are the current weather parameters in Mercer Island today?
2. What are the current weather parameters in Mercer Island today?
Here is a complete overview of Mercer Island's current weather conditions as of 08:00 AM 18 August 2026: Condition : Overcast Temperature : 17°C Cool (Feels like 17°C) Humidity : 86% Wind Speed : 6.8 km/h from SSW (200 degrees), Gust 3 m/s UV Index : 0.6 (Low Air Pressure : 1020 mb Cloud Cover : 92% Visibility : 10 km Precipitation : 0 mm (7% chance of rain)
3. What is the 10-day weather forecast for Mercer Island from 08:00 AM 18 August 2026?
3. What is the 10-day weather forecast for Mercer Island from 08:00 AM 18 August 2026?
From 08:00 AM 18 August 2026, Mercer Island's 10-day forecast shows this trend: Today (Aug. 18) : Temp. 22°C, Hum. 66% and Sunny condition. Wednesday (Aug. 19) : Temp. 21°C, Hum. 60% and Sunny condition. Thursday (Aug. 20) : Temp. 22°C, Hum. 54% and Sunny condition. Friday (Aug. 21) : Temp. 23°C, Hum. 54% and Overcast condition. Saturday (Aug. 22) : Temp. 18°C, Hum. 70% and Patchy rain nearby condition. Sunday (Aug. 23) : Temp. 19°C, Hum. 62% and Sunny condition. Monday (Aug. 24) : Temp. 21°C, Hum. 58% and Overcast condition. Tuesday (Aug. 25) : Temp. 21°C, Hum. 56% and Overcast condition. Wednesday (Aug. 26) : Temp. 19°C, Hum. 67% and Heavy Rain condition. Thursday (Aug. 27) : Temp. 19°C, Hum. 68% and Rain condition.
4. Will it rain in Mercer Island today?
4. Will it rain in Mercer Island today?
As of 08:00 AM 18 August 2026, there is a 25% chance of rainfall in Mercer Island later today around 2026-08-18 08:00. Current precipitation is 0 mm. Residents are advised to carry an umbrella before heading out.
5. What is the monthly weather forecast for Mercer Island in August 2026?
5. What is the monthly weather forecast for Mercer Island in August 2026?
August 2026 in Mercer Island is forecast to have 21 sunny days, 7 rainy days, 0 cloudy days, and 0 snowy days. Temperatures for the month range from lows around 11°C to highs of 30°C.
6. How does the weather in Mercer Island affect air quality?
6. How does the weather in Mercer Island affect air quality?
Weather directly impacts air quality in Mercer Island. Calm winds, high humidity, fog, and high pressure trap pollutants near the ground, worsening AQI. Strong winds, rainfall, and low pressure help disperse them. Rising temperatures and UV levels intensify ozone and smog formation, while poor visibility signals elevated particulate matter. Monitoring weather alongside AQI gives the clearest picture of outdoor safety.
