Seattle residents and visitors often plan activities around the city's variable weather. Understanding how many sunny days per year Seattle sees helps set realistic expectations for outdoor plans.
Below is a structured snapshot of Seattle sunshine patterns and seasonal trends, followed by deeper insights and practical guidance.
| Season | Avg Sunny Days | Typical High Temp | Key Weather Notes |
|---|---|---|---|
| Spring (Mar–May) | 55–65% of days | 55–65°F (13–18°C) | Increasing sunshine, occasional rain |
| Summer (Jun–Aug) | 75–85% of days | 75–80°F (24–27°C) | Long dry stretches, peak sun hours |
| Fall (Sep–Nov) | 50–60% of days | 50–65°F (10–18°C) | Storms return, daylight decreases |
| Winter (Dec–Feb) | 30–40% of days | 45–50°F (7–10°C) | Mostly cloudy, frequent rain |
Annual Sunny Days Statistics
Seattle averages about 215 to 230 sunny or partly sunny days per year when the sun breaks through or stays visible for much of the day. Exact counts shift with measurement thresholds, yet the city reliably experiences a marked uptick in clear conditions from late spring through summer. Clouds and marine influence dominate the cooler months, limiting consistent sunshine but rarely eliminating bright midday intervals.
Regional Microclimates Around Seattle
The broader Puget Sound region creates distinct local conditions that shift how sunny any given day feels just a few miles from downtown. Neighborhoods, Eastside slopes, and nearby valleys can vary widely, helping residents choose the best spots for parks, events, or photography on any particular day.
Eastside vs Westside Sunshine
Eastern suburbs often enjoy clearer skies because of prevailing westerly flow and the Olympic rain shadow. West Seattle and areas closer to the water see more frequent cloud cover, though summer still brings broad improvement across the region.
Microclimate Impact on Planning
Understanding microclimates support smarter scheduling, especially for weddings, festivals, farmers markets, and outdoor workouts. During the bulk of sunny days in summer, the entire area thrives, while winter overcast can still vary noticeably by a few degrees and minutes of direct sun.
Best Times for Outdoor Activities
Summer months provide the most reliable window for hiking, sailing, festivals, and patio dining, with long daylight and warm highs. Spring and fall can still offer rewarding conditions on high-pressure days, while winter favors indoor venues interspersed with occasional bright weekends.
Practical Recommendations for Residents and Visitors
- Check multi-day forecasts during spring and fall for windows of high pressure.
- Plan major outdoor events between May and September for the best chance of sun.
- Use nearby hills or the Eastside on overcast days for better visibility and light.
- Bring layers and rain gear even in summer to adapt quickly to changing conditions.
FAQ
Reader questions
How many days per year does Seattle actually see full sunshine?
Seattle records roughly 215–230 days with significant sunshine annually, though cloudiness varies by neighborhood and elevation.
Does Seattle have more sunny days than Portland?
Yes, Seattle tends to have slightly more sunny and partly sunny days each year than Portland due to regional rain shadow effects.
Is summer in Seattle consistently sunny every day?
Not every day, but summer brings the highest proportion of sunny intervals, with occasional brief rain showers that typically pass quickly.
What months have the lowest sunshine probability?
December through February show the lowest sunshine probability, with overcast skies and rain on many days despite occasional clear breaks.