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Posted at 9:45 AM ET, 04/26/2009

Forecast: Spring Swelters Like Summer

By Brian Jackson


Today: Mostly sunny, isolated p.m. t-storms. 87-90 | Tonight: Clear, mild. 55-63. | Tomorrow: Mostly sunny, hot. 88-91. | A Look Ahead


The heat wave continues! Abundant sunshine and temperatures up to 20 degrees higher than average continue to toast the mid-Atlantic for the next few days. Whatever you do, make sure to bring along the sunglasses and sunscreen, you'll need both while outdoors. By Wednesday temperatures return to normal, with more chances for showers and thunderstorms in the forecast.

Temperatures: Current area temperatures. Powered by Weather Bonk. Map by Google. Hover over and click icons for more info. Click and hold on map to pan. Refresh page to update. See map bigger on our Weather Wall.

Today (Sunday): The preview of our summer swelter continues today. Plenty of sun will launch the mercury into the upper 80s during the afternoon, with a few isolated pockets of 90 scattered about. Some late day cumulus clouds may develop at the peak of our heating, and with any enhancements from a bay breeze or a weak disturbance to our north, a few brief thundershowers cannot be ruled out. Winds will be out of the west at less than 10 mph. Confidence: High

Tonight: Quite a pleasant night is in store if you feel like christening the deck or patio for the season. Mostly clear skies will abound and temperatures will only fall to around 60 degrees (some 50s in the cooler suburbs, low 60s downtown). Light winds from the southwest will diminish through the night. Confidence: High

Keep reading for the forecast through your mid-week...

Lightning from last night's storms. By CWG photographer Ian Livingston.

Tomorrow (Monday): A retrograding high pressure system off the coast edging back inland will keep the skies mostly clear through the day and push our highs to the upper 80s to lower 90s. Winds will continue from the west/southwest at 5-15 mph. Confidence: High

Tomorrow Night: Tomorrow night should seem familiar, nearly a carbon copy of tonight. Clear skies continue and overnight lows will again range from the low 60s downtown to the upper 50s outside of the beltway. Winds will be light. Confidence: Medium-High


Tuesday continues to bring well above average warmth. Mostly sunny skies and temperatures once again in the upper 80s prevail area-wide. Clouds may begin to arrive during the evening and there's a small chance for a few overnight showers. Confidence: Medium-High

Wednesday we'll see our summer heat come to an end, though don't expect a return to the 50s any time soon. We'll also begin a stretch of unsettled weather with the chance for some showers/t-storms through the day. Skies will otherwise be mostly cloudy, and your highs will reach the low-to-mid 70s. Confidence: Medium-High

By Brian Jackson  | April 26, 2009; 9:45 AM ET
Categories:  Forecasts  
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Next: Forecast: Heat Hangs on Through Tomorrow


Temperatures already in the 80s many places.. mid 90s might not be out of the question for places like IAD. DCA looks to top 90 today at this rate as well.

Posted by: Ian-CapitalWeatherGang | April 26, 2009 10:14 AM | Report abuse

Do you really need sunscreen more when it's 90 than when it's 70, for a given time of year and cloud cover? That doesn't sound right. Maybe you were just being metaphorical with the summer like weather.

On a more important note, I see that later in the week we're back down into the 70-range. This spring to me seems like the most rapidly-varying in history. Like if you looked at the average single-day (absolute value) change since March, this year would be right up there. I'm curious to know if that is just my imagination. Does anyone keep those kind of stats (readily accessible)? I'd love to know.

Posted by: B2O2 | April 26, 2009 11:57 AM | Report abuse

Already at 90° or above:
Ft. Meade
College Park
Ocean City (!)

Posted by: CapitalClimate | April 26, 2009 11:58 AM | Report abuse

You're correct that UV exposure is a function of
(1) sun angle (day of year and time of day)
(2) cloud cover

Today's noon sun angle of 64.5° is equivalent to mid-August, regardless of temperature.

Posted by: CapitalClimate | April 26, 2009 12:46 PM | Report abuse

When last night's storm hit, I was already inside the Spanish Ballroom...thunderstorms are primarily a threat when I'm outside TRYING to get a bus to the dance, unfortunately more of an issue during afternoon/evening hours.
Most of yesterday evening was clear, but there was a beautiful red sunser w. visible virga at Glen Echo Park. Volcanic impact possible from Mt. Redoubt dust.

Today continues a slight risk of moderate to severe evening thunderstorms. Later this week the period Wednesday through Saturday shows rain potential as an east-west frontal boundary moves through us Wednesday, stalls in southern Virginia or NC and moves back as a warm front on Friday. Rain/thunderstorms could affect my Tuesday and Friday evening dances, with minimal impact tomorrow night.

Posted by: Bombo47jea | April 26, 2009 12:50 PM | Report abuse

IAD at 90 now, record there today is 92.

Posted by: Ian-CapitalWeatherGang | April 26, 2009 12:58 PM | Report abuse

Joining the 90°F/32°C club:
Ft. Belvoir

Posted by: CapitalClimate | April 26, 2009 1:02 PM | Report abuse

Posted by: CapitalClimate | April 26, 2009 1:23 PM | Report abuse

If its already 88 degrees in Arlington, I am thinking a high of 88 is about 5 degrees off.

Posted by: wecndo | April 26, 2009 1:31 PM | Report abuse

National joins the 90°F/32°C club @ 2 pm.

Posted by: CapitalClimate | April 26, 2009 1:55 PM | Report abuse

Hm, National's 32°C was 31.7°, so it's only 89.1°F.

Posted by: CapitalClimate | April 26, 2009 2:24 PM | Report abuse

National has hit 90 in between obs.

Posted by: Ian-CapitalWeatherGang | April 26, 2009 2:35 PM | Report abuse

My, not-so-reliable, station has 93 here in Columbia.

Posted by: Brian-CapitalWeatherGang | April 26, 2009 3:58 PM | Report abuse


Posted by: SnowMonsterDC | April 26, 2009 10:29 PM | Report abuse

What a perfect evening for a cookout -- the temperature was perfect with a slight wind, no rain... and best of all, the summer mosquito season hasn't started yet!

Posted by: stuckman | April 27, 2009 12:31 AM | Report abuse

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