Average Monthly Sunshine hours in Mercer Island (WA)

This graph shows the average number of hours per month that Mercer Island receives direct sunlight. The numbers are calculated over a 30-year period to provide a reliable average.

• On average, July is the sunniest month with 312 hours of sunshine.
• December has on average the lowest amount of sunshine with 54 hours.
• On average, the total annual amount of sun is 2180 hours.

Forecast: is it sunny in Mercer Island (WA)?

Tue   Nov 26

8°C | 5°C

NE 7 km/h

0.2 mm

broken clouds and small chance of slight rain

hourly forecast

Wed   Nov 27

9°C | 4°C

W 7 km/h

overcast and no rain

hourly forecast

Thu   Nov 28

10°C | 3°C

NW 7 km/h

broken clouds and no rain

hourly forecast

5-Day Forecast 10-Day Forecast