Mercer Island Weather in January

With daytime temperatures of 8°C (46°F) and nighttime lows of 2°C (36°F), January in Mercer Island brings low temperatures during the day. Do keep in mind that quite a bit of rainfall is typical. Around 140 mm (5.5 in) falls on average.

Rainfall in Mercer Island in January

You can expect rain on around 19 days based on historical patterns, with 140 mm (5.5 in) average for the month. Expect frequent rainfall this month, and not just light drizzle. When it rains, it tends to come down hard.

Temperature in Mercer Island in January

January in Mercer Island sees highs of 8°C (46°F) and lows of 2°C (36°F) overnight. January is part of winter. It stays cool throughout the day, so warm layers are a good idea from morning to evening. Nights fall to 2°C (36°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep.

Sunshine in Mercer Island in January

The area experiences limited sunny days, amounting to roughly 70 hours of sunshine. This makes it perfect for those who lean towards cooler, cloudier settings rather than intense sunlit days.

Wind Speed in Mercer Island in January

Wind speeds average 5 m/s (10 knots) during January. At this speed, gentle to moderate breezes make small trees sway and the wind creates whitecaps on water bodies. Daily variations range from moderate winds to stronger breezes, creating excellent conditions for sailing, kite flying and wind sports.

January in Mercer Island can still be great, but if you prefer pleasant temperatures along with dry and sunny conditions, our weather planner can help you explore other options in the world.

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Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Mercer Island's climate page.

Mercer Island Temperature in January

Min Temperature 2°C (36°F)  

Max Temperature 8°C (46°F)  

Chance of Rain 63%  

Precipitation 140 mm (5.5 in)  

Rainy days 19 days  

Humidity 78% *  

Windspeed 5 m/s (10 knots) *  

Sunshine 70 hours *  

Percentage Sunshine 25% *  

* Data from: Seattle, the United States of America (15 KM, 9 Miles).

What to Wear in Mercer Island in January

Dress warmly and in layers for your trip to Mercer Island in January. A good base layer system works wonders. Start with good thermal underwear, add something warm like a fleece sweater, then finish with a waterproof jacket on top. Expect heavy rainfall, so bring good rain protection and waterproof bags. You can probably leave your sunglasses at home, because sunny days are pretty rare this month.

What To Do in Mercer Island in January

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

4/10

Cycling

4/10

Walking

4/10

Camping

3/10

Outdoor sports

4/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Mercer Island's climate page.

More climate data for Mercer Island

Temperature Rainfall Sunshine Humidity Wind Speed

See the full Mercer Island climate overview or explore weather in the United States of America.