January in Shoreline averages a daily high of 8.6°C with nights around 2.9°C. Expect roughly 19.4 wet days totalling 138.5mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Shoreline is July–August.
Based on SEATTLE SAND POINT WEATHER FORECAST OFFICE, WA US (10km), 1995–2024. 29 years of January data.