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.