From the ABC 7 Weather team

September weather in Washington D.C.

September 2, 2013 - 05:14 AM
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Taking a look at the average conditions to expect in September in the D.C. area.

August went out with the high heat and humidity and September has continued with highs in the low 90s for the start of the month. So what should you expect for the remainder of the month? Here is a look at the average September conditions in the D.C. area.

Yesterday Reagan National reached 93 degrees, and is expected to do so once again today. This isn't completely out of the norm, as it hit 95 on September 1st last year, but the average high temperature for the start of the month is in the mid 80s (84°F), so the month will definitely start out above normal.

By September 30th, the average high is down to a comfortable 74°F, and average low temperatures are at 57°F! Reagan National hasn't been in the 50s since June 5th when it hit 59°F.

Record highs are in the 90s for the month but there are only three record highs at 100°F or better, so extreme heat is beginning to subside. Record lows really fall during the month from the 50s the beginning of the month to the upper 30s by the end.

Averages in September at DCA

One big thing you'll notice is the amount of daylight the area will lose during the month. September 1st starts with 13 hours and 1 minute of daylight, where as by the 30th, there will be under 12 hours of daylight at 11 hours and 49 minutes. The 26th is the first day this fall with under 12 hours of daylight.

Meteorological Fall started on the 1st of the month, but the Fall Equinox actually is on Sunday the 22nd this September at 4:44pm. This occurs when the sun lies directly over the equator. The tilt of the earth will begin to bring more direct sunlight to the Southern Hemisphere after the 22nd.

When do the leaves change around the D.C. area? Well you'll have to wait at least another month, as they won't change until closer to mid or late October.

Reminder, even though the tropics were quiet through August, the climatological peak in in September, so we'll be sure to keep you aware of anything that develops!
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