12:40 p.m. update: A heat advisory has been issued until 7 p.m. Friday for the Interstate 95 corridor from roughly Fredericksburg to Baltimore given heat index values around 105 degrees.

Original post from 5 a.m.

TODAY’S DAILY DIGIT
A somewhat subjective rating of the day’s weather, on a scale of 0 to 10.

3/10: A tiny bit less hot and humid, with cooling storms possible. Unfortunately some of them could be severe.

EXPRESS FORECAST

Today: Increasing clouds. PM Storms. Highs: Muggy low-to-mid 90s.
Tonight: Storms ending, clearing. Lows: Upper 60s to mid-70s.
Tomorrow: Decreasing clouds. Tolerable. Highs: Mid-80s to around 90.
Sunday: Mainly sunny, summery. Highs: Upper 80s to low 90s.

View the current weather at The Washington Post headquarters.

FORECAST IN DETAIL

Storms are a-brewin’ today. But, whew, our hottest day of the summer (so far) is behind us! Mother Nature makes it up to us with more sun and less humidity this weekend. Hard to complain about average heat for this time of year.

Today (Friday): A tad less hot and muggy than Thursday, with heat index values probably staying below 105. We’ll take it. But we do have thunderstorm chances increasing as the day wears on. Starting around midafternoon into evening, isolated severe storms with damaging winds, large hail, dangerous lightning and heavy downpours are possible. Evening rush hour could be hampered. Ahead of this approaching cold front, temperatures still eye the low-to-mid 90s and dew points likely hover in the tropical 70s. Confidence: Medium-High

storms_01

Tonight: Scattered showers and storms — some big ones through late evening are possible — could take their time dissipating, perhaps into overnight as the cold front finally comes through. As we bottom out near sunrise with temperatures in the upper 60s to mid-70s (downtown), conditions should calm and clear a bit. Light west-northwest breezes start trying to dry us out. Confidence: Medium-High

Follow us on Facebook, Twitter and Instagram for the latest updates. For related traffic news, check out Gridlock. Keep reading for the forecast into next week.

Tomorrow (Saturday): Average warmth will feel great, as well as lower and more breathable dew points in the 60s. Not delightful, but not terrible. As slightly cooler air slowly mixes into our region on northwest winds around 10 mph, high temperatures top out in the mid-80s to around 90. Use that sunscreen as skies clear out. An isolated shower barely deserves (10 percent chance) mention. Confidence: Medium-High

Tomorrow night: It already turns a bit stickier, as northwesterly breezes die down. Skies stay mainly clear if you’re dying for some midsummer telescope time. Pre-dawn temperatures halt their descent in the 60s outside of the Beltway, to perhaps low 70s downtown. Confidence: Medium-High


The view under a footbridge at Johns Hopkins University’s Homewood campus on Monday. (Kunal Maiti via Flickr)

A LOOK AHEAD

Sunday: A sunnier version of Saturday, summery but not-too-humid conditions reign. Temperatures in the upper 80s to low 90s, with only a few afternoon clouds, mean all of you at the beach or pool better be using those sunglasses and UPF clothing. Breezes appear to want to stay light and variable. Enjoy a fairly typical July day. Confidence: Medium-High

Sunday night: May turn muggier, with a slight shower or storm chance. Overnight low temperatures slip down to the mid-60s in the typically cooler spots, with mid-70s probable downtown. Keep that air conditioner running, District residents! Confidence: Medium

Summery, steamy and perhaps stormy Monday and Tuesday. Upper 80s to low 90s may have the added impact of muggy dew points at times, but we’re acclimating to July conditions by now, right? Both days’ shower and storm chances are decent, in the 50 percent range. We’ll tweak the forecast and offer greater detail on timing and potential rain amounts as we get a bit closer. Confidence: Medium