From the ABC 7 Weather team

A cool Sunday, but summer warmth and humidity are coming back

September 18, 2011 - 12:05 PM
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It'll be jacket weather again today, but summer will stage a comeback before yielding to fall later this week.

This Afternoon: Partly Sunny & Cool

Highs: 66-70 | Wind: NE 5-10

Tonight: Mostly Cloudy, Seasonably Cool

Lows: 50-56 | Wind: NE 3-7

Monday: Partly Sunny, A Bit Milder

Highs: 68-73 | Wind: NE 5-10/SE

It wasn't your imagination: yesterday was the coolest day we've had in many months.  The 65 degree high temperature at Reagan National was the lowest reading since way back on May 13 when the daytime high was 64.  With high pressure still in control, look for a similar day today with one notable exception: while Saturday was mostly cloudy with some peeks of sunshine, today looks to be a bit sunnier during the afternoon hours; north and west of the city, the sun will be far more prominent and earlier in the day.  Highs today should again be in the 60s, significantly below the seasonal average of 79.

Despite the current chill in the air, don't put the shorts away just yet, or the umbrella.  As the jet stream moves to the north, a series of low pressure systems and southerly winds will return warmer and more humid air to the Washington area for much of the week starting on Tuesday.  Look for temperatures to rise to near 80, dewpoints to the mid 60s, and rain chances to 40% for the middle and latter parts of the week.  A late week cold front is expected to return us to more autumnal weather for Saturday.  That'll be just in time for the new season as the autumnal equinox occurs on the 23rd.

NOTE: While this year has again been a very hot one, it has been far wetter than 2010.  By this date last year, we had tallied a mere 22 inches of rain; this year, thanks to the flooding rains of the past month, the figure is an eye-popping 35 inches.  Enjoy this cool and dry Sunday!

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