DC area forecast: Wet and cooler today. Next heat wave Sunday.

Today’s Daily Figure

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

4/10:Humidity is high, but a short break from the heat and drought-inducing rainfall is welcome.

Fast prediction

  • Today: Humid and rainy. Highs: Upper 70s to mid 80s.
  • This evening: Showers and storms still possible. Lows: Around 70 to mid 70.
  • Tomorrow: Chance of rain slowly decreasing. Highs: Upper 80s to lower 90s.
  • Sunday: The heat is back. Less humid? Highs: Mid 90s.

Detailed forecast

Cooler air and rain today will help to alleviate at least some of our increasing dryness. Rain will continue into tomorrow, especially east of the city, as temperatures rise. Very high humidity may drop to just “high” levels Sunday and into the workweek as the heat returns from the 90s to around 100 degrees.

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Today (Friday): Grey, wet, very humid and a bit windy. Scattered showers, thunderstorms and downpours (especially from noon to midday) are possible. High temperatures in the late afternoon will reach a few degrees of 80. Confidence: Medium-High

This evening: Showers and storms will linger, but will slowly decrease in intensity and coverage. Temperatures will hover around the 70s to mid 70s at their lowest. Rainfall totals should total at least a half inch around the city. The northwest part of the city will likely be driest, with the southeast part of the city likely to see the most rain and perhaps some localized flooding. Perhaps some localized fog toward the end. Confidence: Medium-High

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Tomorrow (Saturday): While it’s hard to rule out clouds and rain chances with any great certainty, the morning hours look grayer and more humid than the afternoons. Rain chances remain highest and last longest east of the city, compared to western counties that can generally stay drier than not. Humidity hovers around balmy levels, making heat index readings as steamy as the 90s, despite the thermometer straddling the highs of 80 and lows of 90. Certainty: Medium

Tomorrow evening: The chance of a little rain continues to decrease. Skies will probably be partly clear more often than not and almost everyone can start drying out. Temperatures will stabilize in the upper 60s to mid 70s. It will still be very humid. Confidence: Average

Sunday: The heat is back with highs climbing into the mid-90s at least. Dew points could drop below 70 degrees, giving us a slight humidity refresh. However, it is still possible to issue a heat warning. We have about a 20 percent chance of an afternoon or evening thunderstorm. Confidence: Medium

A look ahead

Sunday night: Showers, storms and downpours remain somewhat possible through midnight. Temperatures should drop to the low to mid 70s. Confidence: Average

Mid 90’s to about 100 degrees Monday and Tuesday could fall just below the feeling of 110 degrees (excessive heat alert criteria) if the humidity behaves. As it stands, it could very well be uncomfortable, but not oppressive. Heat alerts are likely – given the very high temperatures alone – combined with still noticeable humidity (dew points near but perhaps not consistently above 70).

Thunderstorms tend to like this type of air mass and are most likely to develop during the afternoon and evening hours, with some potential for rumbling during the night hours. Confidence: Average

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