No active NWS warnings found for the Seattle area
Issued 236 AM PDT Mon Oct 19 2026 — Including the city of Downtown Seattle

TODAY

Mostly cloudy. Highs near 60. Light wind.

TONIGHT

Mostly cloudy in the evening then becoming partly cloudy. Lows in the mid to upper 40s. North wind to 10 mph.

TUESDAY

Partly sunny in the morning then becoming sunny. Patchy fog in the morning. Highs near 60. North wind 10 to 15 mph.

TUESDAY NIGHT

Mostly clear. Lows in the 40s. North wind to 10 mph in the evening becoming light.

WEDNESDAY

Sunny. Patchy fog in the morning. Highs in the lower to mid 60s. Light wind.

WEDNESDAY NIGHT

Partly cloudy. Lows in the mid to upper 40s.

THURSDAY

Mostly cloudy. Highs in the mid to upper 50s.

THURSDAY NIGHT

Mostly cloudy with a chance of showers in the evening, then partly cloudy with a slight chance of showers after midnight. Lows in the mid 40s.

FRIDAY

Partly sunny. Highs in the mid to upper 50s.

FRIDAY NIGHT

Partly cloudy in the evening then becoming mostly cloudy. Lows in the lower 40s.

SATURDAY

Mostly cloudy. A slight chance of showers in the morning, then a chance of rain in the afternoon. Highs in the mid 50s.

SATURDAY NIGHT

Mostly cloudy with a chance of rain. Lows in the lower to mid 40s.

SUNDAY

Mostly cloudy with a chance of rain. Highs in the mid 50s. TEMPERATURE / PRECIPITATION Seattle 60 47 60 / WAZ314-192300- 236 AM PDT Mon Oct 19 2026

Issued 824 AM PDT Mon Oct 19 2026

SYNOPSIS

Upper level low off the coast near 130W will move south ending up off the Central California coast Tuesday. Southwesterly flow aloft over the area Wednesday. Front dissipating over Western Washington Thursday with the trailing upper level trough moving through Thursday night into Friday. Lots of uncertainty in the weekend forecast with a few model solutions showing a strong front moving into the area.

SHORT TERM /TODAY THROUGH WEDNESDAY/

Satellite imagery shows high clouds over Western Washington this morning with an upper level low along 130W west of Hoquiam. Temperatures at 3 AM/10Z in the 40s and lower 50s. Upper level low moving south today with southwesterly flow aloft keeping high clouds over the area. There are some temperature dew point spreads near 0 early this morning so even with the cloud cover patchy fog possible until mid morning. Highs in the upper 50s to mid 60s. Upper level low continuing to move south tonight and Tuesday ending up off the Central California coast. As the low moves farther away high cloud cover will thin out overnight into Tuesday. Thinner cloud cover overnight plus light surface gradients will lead to more fog coverage Tuesday morning. The layer will be shallow enough to dissipate by noon. Lows tonight mostly in the mid 30s to mid 40s with local lows near freezing over the Southwest Interior and near the Hood Canal. Highs Tuesday in the upper 50s to mid 60s. Upper level low well to the south with a developing upper level trough well to the north Tuesday night and Wednesday leaving mostly clear skies over Western Washington. Low level flow turning offshore but not strong enough to prevent areas of fog from developing early Wednesday morning. What fog that does form will dissipate by midday. Lows in the 30s and lower 40s. Highs in the lower to mid 60s. Felton

LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/

Extended models in good agreement early on with a weakening front dissipating over the area Thursday for a chance of showers. Trailing upper level trough moving through Thursday night into early Friday with surface high pressure building into the area for a dry Friday. Confidence in the forecast for the weekend pretty low at this point. Model run to run consistency terrible with solutions all over the place for a developing system off the coast. Previous run had a few windy solutions for Saturday into Sunday with rain. Some of the ECMWF ensembles still pointing at a windy coast and Northwest Interior scenario. GFS solutions much weaker with the operational run about 20 mb weaker with the surface low associated with the front versus the ECMWF. With all the uncertainty weekend forecast a broadbrush chance of rain/rain likely. Do not have any impactful winds in this forecast package. Pretty confident the weekend forecast is going to change a few times before Friday. Highs in the mid to upper 50s though the period with lows in the 30s and lower 40s. Felton

AVIATION

Southwesterly flow aloft is expected today as an upper trough digs southward offshore. Flow aloft then turn more variable into early Tuesday. Mid to high level clouds this morning is limiting areal coverage of low clouds and fog with the exception of more fog prone locations in the Southwest Interior, some river valleys, and extreme southern Puget Sound for the potential of IFR/LIFR conditions. Impacted terminals expected to improve by 18z for widespread VFR conditions. Winds will shift more southerly Monday morning then transition back northerly in the evening. More widespread low clouds/fog a possibility late tonight into Tuesday morning. KSEA...Confidence leans toward VFR conditions continuing today. Mid- high clouds overhead should limit fog development this morning. Surface winds light this morning. Winds will shift more northwesterly after 19Z-21Z at 5-8 kt and remaining into the evening. 33/41

MARINE

A low pressure system passing southward well offshore will keep winds northerly or weakly offshore for today. Weak high pressure will remain across the waters into the middle of the week for a period of benign conditions. A larger swell train near 10-12 feet generated by active weather well offshore is expected to reach the coastal waters around Thursday along with an increase in onshore flow. A front may reach the waters toward the end of the week but much uncertainly exists in regards to current track and intensity. 41

SEW WATCHES/WARNINGS/ADVISORIES

WA...None. PZ...None. 

About WindWatch

Windwatch is a real-time wind forecast system that displays sustained wind and gust forecasts for the Seattle Metro area and Western Washington. Forecasts currently come from two sources: the "UW Forecast", which are taken from the 4-km resolution University of Washington WRF Forecast Model, and "NWS Gridded Forecast", which are the National Weather Service (NWS) Gridded Forecasts. The NWS Gridded Forecasts are interpolated to the WRF model grid point locations.

Updates to the UW Forecasts occur twice daily, at about 4am and 4pm local time. Updates to the NWS Gridded Forecasts occur every three hours. Both have forecasts extending out to 72 hours.

Gust vs. Sustained

Sustained winds are the forecasts of time-averaged winds and reflect the expected constant wind speed for a given time, while gusts are the forecasts of the maximum instantaneous wind speed for a given time. Because the WRF Model does not have an explicit forecast of wind gusts, they have to be estimated by taking the sustained wind forecast times a "gust factor". This gust factor was determined to be 1.50, and not the typical 1.25, due to the apparent averaging time of the WRF Model sustained wind forecasts, which approximate a 30-min average observed wind speed. Using this averaging time, gust factors were calculated using five years of 1-min data from Sea-Tac Airport, resulting in the 1.50 gust factor. NWS Gridded Forecasts include a forecast of wind gust so no estimation is needed for those.

The Windwatch project is lead by Professor Cliff Mass. Implementation of the system was performed by Jeff Baars and Dave Carey. Funding for Windwatch is provided by Seattle City Light.

Contact Information

Jeff Baars
UW Dept. of Atmospheric Sciences
(206) 543-4258
jbaars@atmos.washington.edu

Cliff Mass
UW Dept. of Atmospheric Sciences
(206) 685-0910
cliff@atmos.washington.edu