When to visit
Mercer Island?

Discover the best time of year, based on historical climate, temperature, and precipitation.

Mercer Island
State of Washington · United States of America

The best weather in Mercer Island is from July, August, September.consistent weather climate

Climate score
June
81

Excellent climate

🌥Mild

Temperature
12–21°C
Cool nights
Feels like
10–21°C
Comfortable
Precipitation
67mm
Light rain · 11 days
Sunshine
10.9h
Partly cloudy
Humidity (%)
74%
Comfortable
Annual Climate Analysis
Temperature, Rain & Feels Like
Rain
Actual Temp
Feels Like
-10°10°20°30°JanFebMarAprMayJunJulAugSepOctNovDec
Monthly Overview
Score510274674819490825586
ClimateColdColdColdColdMildMildPleasantPleasantMildCool & rainyColdCold
Temperature3–8°C2–8°C3–11°C5–14°C9–18°C12–21°C14–26°C15–26°C13–22°C9–16°C5–10°C3–8°C
Feels like-1–6°C-1–5°C0–8°C2–12°C7–17°C10–21°C14–26°C15–26°C12–21°C7–15°C2–7°C0–5°C
Precipitation223mm
24 days
116mm
18 days
97mm
17 days
76mm
13 days
69mm
12 days
67mm
11 days
12mm
4 days
32mm
6 days
63mm
9 days
109mm
14 days
187mm
20 days
193mm
22 days
Sunshine2.4h
☀︎ 27%
3.5h
☀︎ 35%
5.8h
☀︎ 49%
8.2h
☀︎ 60%
8.7h
☀︎ 58%
10.9h
☀︎ 69%
12.5h
☀︎ 81%
11.1h
☀︎ 78%
8.9h
☀︎ 71%
5.6h
☀︎ 51%
3.5h
☀︎ 38%
2.3h
☀︎ 27%
WindSE · 21 km/hSE · 20 km/hS · 18 km/hS · 19 km/hSW · 18 km/hW · 17 km/hNW · 15 km/hNW · 17 km/hNW · 17 km/hSE · 18 km/hSE · 20 km/hSE · 20 km/h
Humidity (%)85%83%81%77%76%74%68%70%77%84%85%86%
Day length8.9h10.3h11.9h13.7h15.1h15.9h15.5h14.2h12.6h10.8h9.3h8.5h

Frequently asked questions

What is the best time to visit Mercer Island?

The best time to visit Mercer Island is September, July, August, June, May, with temperatures between 9 °C and 26 °C. The best month is September. September is low season.

What is the weather like in Mercer Island?

Mercer Island has a climate with an overall score of 4.8/10. Annual temperatures range from 2 °C to 26 °C.

What is the hottest month in Mercer Island?

The hottest month in Mercer Island is July, with average highs of 26 °C and lows of 14 °C.

What is the rainiest month in Mercer Island?

The rainiest month in Mercer Island is January, with an average of 223 mm of precipitation.