Forecast: Scorching Summer Heat is Here

* Heat Advisory Monday, Noon to 10 PM (except far N&W: map) *
* Resources: Tips to Stay Cool from the CDC | EPA on Extreme Heat *
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EXPRESS FORECAST

Today: Partly to mostly sunny and hot. 92-98. | Tonight: Mostly clear & muggy. 73-78. | Tomorrow: Sunny and hot. 96-100. | A Look Ahead

FORECAST IN DETAIL

The extreme heat we here at Capital Weather Gang have been advertising for quite a few days now is finally upon us. As a sprawling area of high pressure builds in from the south and west, we'll see abundant sunshine, moderate (to at times high) humidity, and the hottest temperatures we've seen all summer. The hottest day will be tomorrow, when temperatures will make a run for the century mark. Excessive heat continues through Tuesday, with some relief possible by mid-week.

Today (Sunday): If you were up early this morning, it may still have been in the 70s where you were, but by mid-to-late morning temperatures were zooming up through the 80s. A good deal of sun and steamy downsloping winds from the west (around 10 mph) will combine to produce afternoon highs in the mid-to-upper 90s across the area. If there's any solace, humidity will be in the sticky as opposed to oppressive range and scattered cloud cover may hold highs in the low 90s northeast of the District. But in most places, heat indices may still reach or even pass 100 during the hottest part of the day.

As Jason cautioned yesterday, there are a number of major sporting events today that will coincide with the height of the afternoon heat: The Legg Mason Tennis Final, the Nationals game against the Diamondbacks and the D.C. United match-up against Real Madrid. Make sure you wear light colored clothing and stay hydrated! Confidence: High

Tonight: In a word: muggy. Mostly clear skies and relatively high humidity levels will not make for ideal sleeping weather. Overnight lows will drop to the low-to-mid 70s across the cooler spots to the upper 70s downtown. Confidence: High

Keep reading for the continued hot summer weather...

A beautiful evening at the Georgetown waterfront on Friday. By CWG photographer Ian Livingston.

Tomorrow (Monday): We can except very similar conditions on back-to-work Monday as those we'll experience today. That means continued mostly sunny skies, moderate humidity levels, and roasting afternoon highs ranging from the mid-90s to 100. Heat indices may top 100 at times. An isolated thundershower cannot entirely be ruled out during the late afternoon or evening hours, but the vast majority of the area is likely to stay dry. Confidence: Medium-High

Tomorrow Night: It will be another uncomfortably warm night Monday night, with muggy conditions, an isolated thundershower, and overnight lows dropping to the mid-70s across the "cooler" suburbs to near 80 downtown. Yuck! Confidence: Medium-High

A LOOK AHEAD

As a cold front approaches the region on Tuesday, we can expect a bit more in the way of clouds than today and Monday. These partly cloudy conditions will also help to hold temperatures down just a bit: I'm thinking low-to-mid 90s. Scattered showers and thunderstorms are possible (40% chance) during the late afternoon and evening hours. Not quite as oppressive or warm overnight, with lows in the low-to-mid 70s. Confidence: Medium

The outlook for Wednesday is for partly sunny skies and the possibility for some scattered showers or thunderstorms. And, for the second day in a row, not quite as hot as the preceding day. I'm expecting highs to top out around 90, with overnight lows -- for the most part -- in the low 70s. Confidence: Medium