Seattle Weather

9/21/2014

Currently

60°F

Clear
Humidity: 83%
Pressure: 29.90 in

7 Day Forecast

Sunday Sunny Day: 83° Night: 58°
Monday Mostly Cloudy Day: 72° Night: 57°
Tuesday Mostly Cloudy, Light Showers Day: 73° Night: 55°
Wednesday Cloudy, Sprinkles Day: 68° Night: 59°
Thursday Mostly Cloudy, Light Showers Day: 66° Night: 56°
Friday Partly Cloudy, Light Showers Day: 67° Night: 54°
Saturday Partly Cloudy, Light Showers Day: 68° Night: 52°

So far today...

High: 76°
Precip: 0.00"
Low: 57°
Normal
Record
69°
88° (1974)
51°
40° (1949)
Sunrise
6:53am
Sunset
7:11pm
Precipitation
 
Normal
Friday
Trace
0.05"
This Month
0.15"
0.83"
Since 1/1
30.04"
21.42"
Since 10/1
37.03"
36.82"

Today's Forecast

Updated: Saturday, 11:25p.m.

Another weekend, another round of gorgeous late summer sunshine in Western Washington.  The same overall pattern that has been with us most of the summer--a clearing upper ridge joining forces with a hot thermal trough at the surface--is pushing the mercury up again.  Highs ranged from the 60s in the San Juans to the 80s at the coast Saturday, and for most of us, Sunday will be quite a bit warmer.

Starry skies overnight will allow temps to drop into the 50s in Seattle by dawn, though some of the outlying areas will drop into the 40s by sunrise.  However, the same clear skies letting the heat out will let it back in during the day, and highs will soar into the 80s around Puget Sound.  The 12's will need to wear suncreen along with their Seahawks gear, and anyone heading out to enjoy the final day of the Washington State Fair should expect sunshine and middle 80s atop the ferris wheel.

The beaches will see a big rush of fog, so instead of 80s, we'll drop into the 50s and 60s right near the Washington coastline.  The return of the fog at the beaches will signal the eventual end of the heat for the interior, too...

The first sign of this change will come in the form of a lot of increasing cloud cover on Monday.  HIghs will cool back into the 70s throughout the urban core, and we'll end up mainly overcast by the time the day if over.

By Tuesday, a major pattern shift allows a trough of low pressure to nose in, and the clouds will eventually yield some rain by Tuesday evening.  Wednesday looks rainy much of the time, and highs will drop back into the 60s by mid-week.  Thursday will feature a few more showers, but at this point Friday is looking mainly dry and partly sunny.

Have a great weekend,
Shannon

Meteorologist Shannon O'Donnell
The KOMO4 Forecast Team