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Posted at 5:00 AM ET, 09/25/2010

Forecast: Heat's last gasp, cooling set to begin

By Jason Samenow

Markedly cooler Sunday, rain early next week

* Heat records fall | D.C. had worst summer | NatCast | UnitedCast *
* Radar, clouds & more: Weather Wall | Hurricane Tracking Center *
* Number of 90+ days: 66 (Record 67, 1980) *

Today's Daily Digit
A somewhat subjective rating of the
day's weather, on a scale of 0 to 10.


Still much warmer than normal, but 10 degrees cooler than yesterday & less humid
Get the 'Digit' on Twitter


Today: Partly sunny, very warm. 86-91. | Tonight: Partly cloudy. 55-60. | Tomorrow: Mostly cloudy - chance of a sprinkle late. 70-75 | A Look Ahead | Get Express Forecast by E-mail


We've talked and talked about all the heat records we've set in 2010 but perhaps the most significant still stands: the number of 90+ days at Reagan National that occurred in 1980. Everyone knows the magic number is 67 and we're one short. Today could well be our last chance to get there and it's going to be a very close call. After today, the pattern turns cool and wet so if you like summer-like days, soak in today.

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): It's a balmy morning after overnight lows only in the mid-60s to the low 70s (downtown). Sunshine pushes temps into the low 80s by midday. By that time, a cold front will have moved through the area perhaps briefly increasing clouds and even triggering an isolated shower (15-20% chance). But winds from the west behind the front quickly dry things out with considerable afternoon sunshine. With cool air lagging the frontal passage, highs probably reach the upper 80s to around 90. Confidence: Medium

Tonight: Skies are clear to partly cloudy with seasonable overnight lows ranging from the mid-50s in the cooler suburbs to near 60 downtown. Confidence: Medium-High

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

Tomorrow (Sunday): Flow from the north and northeast means much cooler temps with highs only reaching the low-to-mid 70s. Cloud cover is likely to gradually increase in the afternoon as moisture starts to creep towards the area from the south. However, any rain should hold off until the evening. Confidence: Medium

Tomorrow Night: Light rain probably develops overnight (60% chance), especially late, as a slow moving area of low pressure develops to the southwest. Lows range from 55-60. Confidence: Medium


A soaking rain is a legitimate possibility Monday into Tuesday as low pressure - accompanied by abundant moisture from the Gulf of Mexico -- passes over the region from the south. Highs both days are most likely in the mid-70s with overnight lows near 60. By Tuesday afternoon, we may start to see some slow clearing. Confidence: Medium

By Jason Samenow  | September 25, 2010; 5:00 AM ET
Categories:  Forecasts  
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Next: Going for the gold: National hits 90+ for 67th time


Stats question: didn't the top 10 high 2010 DCA temps average 99.6, slightly below the 1988 figure of 100?

Posted by: JerryFloyd1 | September 25, 2010 9:01 AM | Report abuse

After reading today's Wash Post article by Jason and Ian, the 10 warmest days may have averaged 99.7, not 99.6.

To slightly paraphrase a Sondheim "Sunday in the Park with George" lyric: "It was hot and it was monotonous".

Posted by: JerryFloyd1 | September 25, 2010 10:10 AM | Report abuse

83 degrees and lots of sunshine right now. I think we're in good shape to tie the record!

Posted by: ElJocko | September 25, 2010 11:10 AM | Report abuse

Jerry, yesterday did push the top 10 day avg to 99.7 as you indicate.

Posted by: Ian-CapitalWeatherGang | September 25, 2010 12:41 PM | Report abuse

Thanks, Ian. I had forgotten about the 101 (thought it was 100) 'til I saw your stats in The Post this a.m.

Posted by: JerryFloyd1 | September 25, 2010 2:36 PM | Report abuse

We have tickets to Tuesday night's Nats-Phils game. Do you think the rain will be out of town by then?

Looks like the Phils will have their season wrapped up by Tuesday, so I doubt they're going to go out of their way to get the game played. Go figure, we have scant rain all summer and I buy tickets for a game that will be rained out! Ugh.

Posted by: db_in_va | September 25, 2010 3:04 PM | Report abuse

db, I think most of the midatlantic should stay dry till about midnight tonight. Your game has a decent chance of staying dry. But I would welcome another CWG team member's opinion.

can you all believe we hit 99 yesterday?! 90s again today! Luckily, here at the Merriweather Pavilion (Virgin mobile freefest music event) we have not quuiiiite hit 90 yet. Definitely warm! Oof. And, DUSTY

Posted by: Camden-CapitalWeatherGang | September 25, 2010 3:44 PM | Report abuse

sorry db... you said Tuesday...once I'm back with my computer & "forecasting equipment" tomorrow, I can take a look for ya

Posted by: Camden-CapitalWeatherGang | September 25, 2010 3:47 PM | Report abuse

sorry db... you said Tuesday...once I'm back with my computer & "forecasting equipment" tomorrow, I can take a look for ya

Posted by: Camden-CapitalWeatherGang | September 25, 2010 3:48 PM | Report abuse

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