15-Day Weather Forecast - Seattle
15-day weather forecast for Seattle: temperatures from 10°C (50°F) to 31°C (88°F). Average daily high 23°C (73°F) over the next 15 days.
Hourly Forecast by Day
15-Day Temperature Trend
15-Day Weather Forecast
Updated just nowWeather Insight
Seattle's 15-day outlook ranges from a low of 10°C to a high of 31°C, with an average daytime high near 23°C. That's 2° above the long-term average high of 21°C for this time of year. It continues a recent pattern — 11 of the last 20 days with published data have run warmer than normal. Air quality is currently Moderate (AQI 58), driven mainly by PM2.5 at 13 μg/m³.
Today vs Normal
The long-term average high for today is 21°C.
11 of the last 20 days with published data ran above normal.
That's a break from the pattern - today's forecast runs below normal even though the recent stretch mostly ran above.
Red = above normal, blue = at or below · last 12 days
Air Quality
Air quality is acceptable for most people. Unusually sensitive individuals should consider reducing prolonged or heavy outdoor exertion.
Extended Outlook for Seattle
Over the next 15 days, Seattle is forecast to see temperatures ranging from 10°C to 32°C, averaging a daily high of 23°C. The extended outlook indicates occasional showers on 3 days, with 2.3 mm total accumulation. Conditions are suitable for most outdoor activities; carry an umbrella on days with showers.