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Posted at 5:00 AM ET, 08/28/2010

Forecast: Sweet sunshine to become sweaty

By Jason Samenow

Heat wave Sunday through Thursday

* Katrina, 5 years later: Full Coverage | Hurricane Tracking Center *
* Rip current risk | Hurricane threat to U.S. may increase *
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Today's Daily Digit
A somewhat subjective rating of the
day's weather, on a scale of 0 to 10.


Sunsational with low humidity but docking a point due to Strasburg's misfortune.
Get the 'Digit' on Twitter


Today: Sunny and warm with low humidity. 85-89. | Tonight: Mostly clear and comfortable. 59-67. | Tomorrow: Sunny, very warm. Low 90s. | A Look Ahead | Get Express Forecast by E-mail


Yesterday was glorious and today looks mighty fine as well. But we all had to know our historically hot summer wasn't finished with us yet. Tomorrow, the mercury reacquaints itself with the 90-degree threshold and has no problem sailing right by it Monday through Thursday. At least the humidity won't be horrible. If you're interested in rain, there's not a drop in the forecast.

Temperatures: Latest D.C. area temperature map powered by iMapWeather (base map by Google). Click and hold on map to pan. Double-click to zoom. Refresh page to update. See larger map on our Weather Wall.

Today (Saturday): There's no shortage of sunshine and that means early morning 50s and 60s quickly ascend into the 80s by afternoon. Most spots max out in the upper 80s and though that's quite warm, humidity in the low-to-moderate range make it tolerable. High pressure centered over the region means very little wind. Confidence: High

Tonight: Clear skies and light winds facilitate steady cooling. Lows range from the upper 50s in the cooler suburbs to the upper 60s downtown. Confidence: High

Keep reading for the forecast into early next week...

Tomorrow (Sunday): Full sunshine pushes temperatures a few degrees above Saturday's levels. Most spots climb up to around 90 or into the low 90s. Low-to-moderate humidity makes the hot air bearable although there won't be much of a cooling breeze. Confidence: High

Tomorrow Night: It's another fairly pleasant evening with low temperatures ranging from near 60 in the cooler suburbs to near 70 downtown. Confidence: High


Hot high pressure stays locked over the region Monday through at least Wednesday. This means essentially the same weather each day: mostly sunny skies with highs in the mid-90s. Moderate humidity keeps it from becoming overly oppressive but the recent pleasant days will be a distant memory by then. Overnight lows are in the low 60s to the low 70s. Confidence: Medium-High

By Jason Samenow  | August 28, 2010; 5:00 AM ET
Categories:  Forecasts  
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If Acuweather's long-range forecast pans out, there will be 10 more 90-degree days Aug 29-Sept 11. This would bring DCA to 64 90-degrees for 2010 and I'll be heading to Best Fry, instead of Best Buy.

Posted by: JerryFloyd1 | August 28, 2010 8:46 AM | Report abuse

No rain at all. Huh.
I feel sorry for our good friends who will be taking care of the garden while we vacation. They have no idea what they signed up for when they volunteered. Well, it's nice exercise and they'll get some fresh veggies for compensation.
We're leaving a big bottle of DEET by the door for them. They're gonna need it.

Posted by: FIREDRAGON47 | August 28, 2010 9:19 AM | Report abuse

Looking at both the GFS and the NAM's dewpoint forecast for the next couple of days shows quite the discrepancy. The NAM is considerably higher than the GFS. To which should we give more weight? (the GFS looks so much more inviting)!

Posted by: pjdunn1 | August 28, 2010 9:40 AM | Report abuse


I'd slightly favor the NAM-- seems to be better reflecting reality.

Posted by: Jason-CapitalWeatherGang | August 28, 2010 10:15 AM | Report abuse

Thanks Jason!

Posted by: pjdunn1 | August 28, 2010 10:31 AM | Report abuse

Where's this humidity come from? What happened to the cooler, drier air from the earlier forecasts? I suppose it's relative, but I was hoping for better.

Posted by: chris_soule | August 28, 2010 12:06 PM | Report abuse

Not surpised by the return of 90's. I may have under estimated the total of 90 days by Sept 22. I guessed 61 but I think we will exceed that total. Look 4 the temps 2 b much above thru most of the fall. This winter is also looking mild.

Posted by: VaTechBob | August 28, 2010 1:42 PM | Report abuse

Question seems to be whether or not we'll reach or exceed the standing record of 67 90+ degree days in a summer season. Based on past data we have until Oct. 11 to reach that goal.

Everything is nice and green around here so dry weather isn't much of an issue.

Mild winter would be OK with me as long as we don't get a lot of bothersome travel-disrupting rain events. Snow could be missed but we had the equivalent of about four "average" winters this past season. If we get ten to fifteen inches of snow this winter we will have another average season. Our last La Nina winter two years ago featured less than ten inches of snow, but we had numerous non-accumulating flurries and one thundersnow squall, albeit with far less than an inch of accumulation. Whether we get any big snow events in the coming La Nina winter will depend on where the winter jet stream sets up shop.

Posted by: Bombo47jea | August 28, 2010 2:09 PM | Report abuse

I hope La Nina sets up her snow shop so that DCA gets at least an "average" winter's worth of snow and preferably more. Presumably, the SLCB has been kept in safe storage during these hot weather months and will once again glisten, from December-March.

Posted by: JerryFloyd1 | August 28, 2010 2:49 PM | Report abuse


The current dew point of 60 isn't bad and in the low-to-moderate range, though certainly not as low as yesterday. You're right it's all relative.

Posted by: Jason-CapitalWeatherGang | August 28, 2010 3:44 PM | Report abuse

I am disappointed we didn't have longer for lower dewpoints. They have definitely come up into the mid-60s (moderately muggy) range. booo. boo, I say, Mother Nature :-)

Posted by: Camden-CapitalWeatherGang | August 28, 2010 5:36 PM | Report abuse

Not happy about the track the NHC is showing for Earl. Are there any hurricane blogs out there I should be reading (in addition to Cap Wx) to keep an eye on him while I'm in NC this week?

Posted by: ana_b | August 28, 2010 9:34 PM | Report abuse

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