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Posted at 9:45 AM ET, 07/22/2010

Forecast: Heat today, humidity tomorrow

By David Streit

Welcome to the peak of summer

* Heat Advisory tomorrow | Heat weaves, then and now *
* Outside now? Radar, lightning, temps & more: Weather Wall *
* Consec days of 90+: 8; Total 90+: 38 (Apr: 2; May: 3; Jun: 18; Jul: 15) *

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


I know you want a lower number but the heat is old hat and the humidity is actually lower. Try it, you might like it!
Get the 'Digit' on Twitter


Today: Sunny, not as humid. 92-96. | Tonight: Fair, reasonably comfortable. 65-73. | Tomorrow: Mostly sunny, isolated p.m. t'shower. 94-98. | A Look Ahead | Get Express Forecast by E-mail


By David Streit, CWG Meteorologist

The good news is that climatically speaking, we are at the peak of summer heat and average temperatures head downhill after this weekend. The problem is there are probably going to be quite a few bumps of heat before we return to consistently more comfortable levels. Thundershowers will be few and far between now and this weekend which is good for outdoor activities. But oh the heat and humidity! We should easily break a record on Saturday. The bonus for this period is lower humidity today and again on Monday.

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 (Thursday): The 70s at sunrise zip up to the 80s by lunchtime but the humidity is not as oppressive today. Mid-afternoon highs stretch to make the mid-90s in most spots. A few puffs of clouds are likely by afternoon with light breezes from the west. No storms likely today. Confidence: High

Tonight: The evening is still bearable with 80s the rule. Skies are mostly clear and breezes calm. This is a night where the suburbs should make mid-to-upper 60s while downtown can't shake the lower 70s. Confidence: High

Keep reading for the forecast through Monday....

Tomorrow (Friday): The bad news is that both the heat and the humidity jump with highs in the mid-to-upper 90s. Light breezes from the southwest are of little help to the muggy character of the air. A weak disturbance could set off an isolated thundershower by late afternoon but only about 10% of the area should see wet pavement. Confidence: Medium-High

Tomorrow Night: A thundershower or two may linger but any are likely to swiftly dissipate and even 10% coverage will be generous. Evening temperatures in the mid-to-upper 80s keep it tropical. Overnight lows fall to the mid-to-upper 70s. Confidence: Medium-High


On Saturday, summer reigns supreme with 80s quickly giving way to the 90s by midday. Skies are hazy but desirable clouds are few. The record high for this day is only 96 and it is a likely goner as highs top out in the upper 90s to near 100. It would be even hotter but the high humidity actually dampens the heat slightly. Confidence: Medium-High

Sunday starts out in the steamy upper 70s to lower 80s, ugh. This would be another near record day but clouds are likely to increase by afternoon just enough to hold highs in the mid-to-upper 90s. A "cool" front approaches later in the day bringing a 30% chance of thundershowers into the mid-evening. Most outdoor activities should be just fine but keep an eye out. Evening temperatures remain in the 80s in most areas but 70s in areas impacted by thunderstorms. Confidence: Medium-High

Monday dawns with a new lease on life! Skies should be a beautiful blue with rain chances nil. Temperatures only in the 70s and humidity back down to very comfortable levels. Highs still make the upper 80s to lower 90s but it should feel refreshing after the weekend bout with the tropics. Confidence: Medium-High

By David Streit  | July 22, 2010; 9:45 AM ET
Categories:  Forecasts  
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Next: Coming soon: Tropical depression or storm Bonnie


How can the record high for July 24 be only 96 degrees? That's fairly low for one of the hottest days of the year, especially considering some of the records for June days were over 100 degrees.

Posted by: danburd | July 22, 2010 7:58 AM | Report abuse

The "low" record high for July 24 seems to be a fluke, at least according to this picture:

Posted by: eric654 | July 22, 2010 8:04 AM | Report abuse

96 °F (1987) sounds low, and we will probably break the record, but I think the atmosphere's statistical reality just so happens to be valid :-)

Posted by: Camden-CapitalWeatherGang | July 22, 2010 8:36 AM | Report abuse

Posted by: SteveT-CapitalWeatherGang | July 22, 2010 8:59 AM | Report abuse

If you get to play hooky today, the weather is perfect for it. All the windows are open at my house!

Posted by: rosilandjordan | July 22, 2010 9:53 AM | Report abuse

I'm not noticing the lower humidity yet, dews in the upper 60s... bleh.

Posted by: Ian-CapitalWeatherGang | July 22, 2010 10:05 AM | Report abuse

@Ian: Turn your A/C on.

Posted by: ennepe68 | July 22, 2010 12:19 PM | Report abuse

The latest dewpoint at National Airport was 64 compared to 73 at this time yesterday Ian

Posted by: davidstreit1 | July 22, 2010 12:47 PM | Report abuse

No dance scheduled, no rain.

Watch out tomorrow evening; there's a swing dance at the Dulles Hilton...

Posted by: Bombo47jea | July 22, 2010 1:07 PM | Report abuse

davidstreit1, it did drop a good bit from this morning once the downsloping wind kicked in. But 60s dews are hardly enjoyable in my mind. ;-)

Posted by: Ian-CapitalWeatherGang | July 22, 2010 1:46 PM | Report abuse

Humidity is only 35% here in Fairfax. Dew Point is at 61 degrees. Much nicer than it's been in a while.

Posted by: rwalker66 | July 22, 2010 2:32 PM | Report abuse

SteveT, those were nice pics

Eric, that's a neat chart. NOAA needs to change the scale for the snow portion since we're already off the chart and still have December to go.

Posted by: spgass1 | July 22, 2010 2:41 PM | Report abuse

"The good news is that climatically speaking, we are at the peak of summer heat and average temperatures head downhill after this weekend." See!!! This is what I was referring to in my post from yesterday! This is what the Fall-lovers out there need to hear!!! David, you truly are an amazing person.

Posted by: authorofpoetry | July 22, 2010 2:46 PM | Report abuse

I am probably missing an obvious place to find it, but have you given the total # of 90+ days this year?

Posted by: egengle | July 22, 2010 3:51 PM | Report abuse

CWG - any chance that TD3 will bring us some much needed rain?

Posted by: kathyb39 | July 22, 2010 4:07 PM | Report abuse

egengle, top of every forecast post of the past few days.. 39 as of today.

Posted by: Ian-CapitalWeatherGang | July 22, 2010 4:52 PM | Report abuse

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