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D.C. area forecast: A steamy week with a chance of storms to start

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

5/10: Very warm, humid and dodging a storm or 2. Standard fare for late July.


Today: Mostly cloudy, chance of showers/storms. Highs: 85-90.
Tonight: Evening showers-storms possible, then partly cloudy. Lows: 70-75.
Tomorrow: Partly sunny, slight chance of a shower-storm. Highs: 87-91.


Many of us just experienced our first totally dry weekend since early June, but the rain-free streak may end today. A slow-moving front brings showers and storms chances, highest this evening. Aside from today’s rain and some possible storms Thursday, this week’s big story is heat. Most days should hit 90, with some mid-90s possible on Thursday.

Today (Monday): It’s one of those days when showers could pop up at any time, but it’s dry more often than not. The skies vary between partly and mostly cloudy. The considerable cloud cover probably keeps highs below 90 in most (but maybe not all) spots -in the mid-to-upper 80s. Humidity levels are moderately high with dew points near 70. The chance of measurable rain is around 40 percent. Winds are light from the south. Confidence: Medium-High

Tonight: There’s a reasonably good (i.e. 60 percent) chance showers and storms are around this evening. We’re not expecting severe storms, but some locally heavy downpours are possible. Rain coverage should decrease as the night wears on, but even after midnight we hold onto a 30 percent chance of showers. Overnight lows range from 70-75 (suburbs-city). Winds are light. Confidence: Medium-High

For related traffic news, check out Dr. Gridlock. Keep reading for the forecast through the weekend…

Tomorrow (Tuesday): Partly to mostly sunny, and hot. It may be slightly less humid than Monday, but still muggy (dew points upper 60s). I can’t completely rule out a shower (15 to 25 percent chance northwest to southeast), especially in the afternoon and in our suburbs to the south and southeast (towards Stafford County and Southern Maryland). High temperatures are near 90, with a light wind from the southeast. Confidence: Medium-High

Tomorrow night: Partly cloudy and seasonably warm and muggy with overnight lows from the upper 60s in our cooler suburbs to the mid-70s downtown. Light winds Confidence: Medium-High


Wednesday and especially Thursday are quite hot – with highs in the low-to-mid 90s Wednesday and mid-90s Thursday. Factoring in the humidity, it will feel like 100 (or a bit hotter) during the mid-afternoon hours. On Thursday, storms likely develop late in the afternoon and into evening, a few of which may be heavy. Wednesday night’s lows range from near 70 in our cooler suburbs to the upper 70s downtown. Confidence: Medium-High

The period covering Friday through Sunday is hot, with highs mostly near 90 into the low 90s. Humidity, which drops back to the moderate range Friday (dew points near 60), gradually returns into the moderate range over the weekend (dew points in the mid-to-upper 60s Sunday). Much of this period should be dry although I can’t totally eliminate the chance of a shower late Sunday. Overnight lows during this period are mostly from the upper 60s in our cooler suburbs to the mid-70s downtown. Confidence: Medium