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Posted at 3:15 PM ET, 07/14/2009

PM Update: July Heat to Follow September-like Day

By Ian Livingston

Near-normal temperatures, not too humid, for Wed.

* Hurricane Season off to Slow Start | Matt Rogers on El Nino *

We're just days off our typically hottest time of the year, but today's mild temperatures and low humidity just might have made one forget about summer! Dew points temporarily dropped into the upper 30s across parts of the area today and still hover in the low-to-mid 40s most spots. In fact, heat indices, with highs in the mid-80s, have been running lower than the actual temperature thanks to the dry air. Now we watch our amazing day transition to a perfect evening...

Webcam: Latest view of D.C. from the Netherlands Carillon at Arlington National Cemetery. Courtesy National Park Service. Refresh page to update. See this image bigger on our Weather Wall.

Through Tonight: After a glorious evening with sunset temperatures falling through the upper 70s, we head into another cool July night. Temperature should fall into the mid-and-upper 50s in the suburbs to the lower 60s downtown.

Tomorrow (Wednesday): Another mostly sunny day is scheduled tomorrow, though temperatures and humidity will both be on the rise. Dew points should rise through the 50s (still drier than average) to near 60 late, thanks to a south wind, as highs reach the upper 80s to near 90. Some increase in clouds is likely late.

See Matt Rogers' full forecast through the weekend. And if you haven't already, join us on Facebook and follow us on Twitter.

Shuttle Launch: Last Wednesday, I mentioned that weather could mess with this past Saturday's scheduled launch of shuttle Endeavour. Indeed it did, more than once. The initial launch scrub on Saturday was due to numerous lightning strikes on or near the pad. Yesterday, weather disrupted the third attempt in four days to launch the spacecraft. They'll try again tomorrow at 6:03 p.m. Current forecasts give a 60 percent chance of "go."

By Ian Livingston  | July 14, 2009; 3:15 PM ET
Categories:  Forecasts  
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Next: Forecast: Summer Tries to Muster Some Sizzle


Very blue sky today, little to no haze. "Tweeted" an iPhone picture from Dupont Circle earlier.

Posted by: Ian-CapitalWeatherGang | July 14, 2009 3:23 PM | Report abuse

Um... I think you guys mean "Tomorrow (Wednesday)".

How rare is it to see dew points in the 30's in DC in mid July? I've got to believe that 50's are few and far between and 40's are pretty rare. But 30's??

Posted by: pjdunn1 | July 14, 2009 3:37 PM | Report abuse

pjdunn1: From a brief browse through records for DCA METARS it looks extremely rare indeed. Over the last decade, I only pulled one day that got into the 30s for dews at reporting time obs. I guessed and checked days with lows 65 and below. I doubt 30s dew during the day would produce a low much higher than that. July 1, 2007 we hit 39 like today. Even dew points down into the 40s are pretty rare as you mentioned.

Posted by: Ian-CapitalWeatherGang | July 14, 2009 5:57 PM | Report abuse

Thanks Ian. Gotta love this weather!

So now we look at one to 3 days of "summer" and then we are back to the 'ole L.A pattern of low humidity with temps in the mid 80's. Sigh... I guess we have to just deal with it all.

Posted by: pjdunn1 | July 14, 2009 6:48 PM | Report abuse

We have to pay a small price for the wonderful weather, so I think we can take on a couple of days of humidity as a reminder that Mother Nature has been super-nice to us!

Posted by: SanDieganLostinDC | July 15, 2009 12:58 AM | Report abuse

The ground actually seems a bit dry..can the "much-needed-rain" crowd be attempting a comeback???

There were a few altocumulus patches earlier this morning. We may have a late-day thunderstorm in the next three days or so...but TV mets seem to be arguing whether tomorrow or aturday has our biggest rain chance.

Posted by: Bombo47jea | July 15, 2009 1:45 PM | Report abuse

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