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Today: Partly sunny, still quite hot. Isolated a.m. shower/storm? 40% chance of p.m. storms. Mid-to-upper 90s. | Tonight: Muggy, chance of storms. 74-81. | Tomorrow: Partly sunny, a little cooler. 50% chance of p.m. storms. Near 90 to mid-90s. | A Look Ahead | Get Express Forecast by E-mail
I’m hesitant to use the word “relief” when mid-to-upper 90s are likely for highs today, but at least we’re on a downward trend after yesterday’s record heat. Thunderstorms may provide additional cooling for some as a cold front works toward and through the area today and tomorrow. Once it passes, we’ll feel considerably drier, but still warm, come midweek before another hot streak of mid-90s and higher threatens late week into the weekend.
Today (Sunday): There’s a decent chance we fall short of triple digits today. But we’re still plenty humid (maybe more so than yesterday, which saw humidity come down a bit) and quite hot as highs likely reach the mid-to-upper 90s with heat indices up to around 105 under partly sunny skies. That’s still potentially dangerous heat, so don’t let your guard down. After a chance of an isolated morning shower or thunderstorm, increasing afternoon clouds yield a 40% chance for afternoon/evening t’storms. Confidence: Medium-High
Most Likely Timing: Mid-afternoon through evening
Tonight: Shower/storm threats remain near 40% in this hot and humid air mass. Partly to mostly cloudy skies keep temperatures elevated, with lows only in the mid-70s to near 80. Some fog is possible in areas that see an evening storm. Confidence: Medium-High
Keep reading for the forecast through the work week...
Tomorrow (Monday): We’ll see more clouds build as a “cold” front approaches, but partly sunny skies are enough to get us to highs near 90 to the mid-90s and the humidity isn’t ready to let go. With the approaching front, there’s a 50% chance of cooling thunderstorms by afternoon. Confidence: Medium
Tomorrow night: Storm chances may continue through evening but should begin to wane overnight. Late at night, we should get a little relief in the form of lowering humidity as dew points begin to drop below 70, and our overnight lows make some headway down to mainly the low-to-mid 70s . Confidence: Medium
By Tuesday and Wednesday, we’re back into a more typical D.C. area summertime situation as high pressure builds in. Skies are partly to mostly sunny with only a small chance at a lingering storm early Tuesday. It’s still warm with highs near 90 to the low 90s, but with a good deal less humidity it feels pretty darn good compared to the current heat. Tuesday and Wednesday night lows are more tolerable, too - around the upper 60s to low 70s. Confidence: Medium-High
Thursday into the weekend we’re on the watch for possibly another significant heat wave as another area of upper-level high pressure builds in. The details are fuzzy this far out, but highs may very well climb back toward the mid-90s and higher with the heat index potentially nearing or passing 100. Confidence: Medium