Baltimore is staring down a serious heat wave this week, with morning temperatures in the low to mid 70s and a high near 91°F expected today, Tuesday, June 30, 2026. From there, the numbers spike quickly. By Wednesday and Thursday, much of the city will be sitting in the upper 90s to low 100s. The most punishing stretch is forecast for Thursday and Friday, when the heat index could make it feel outright dangerous to be outside for long.
Afternoon Heat Ramps Up
Today brings mostly sunny skies, a steady south breeze and gusts up to about 20 mph through the afternoon. On Wednesday, the heat really kicks in. The forecast calls for a high near 98°F and a heat index near 105°F, according to the National Weather Service. The hotter it gets, the better the odds of spotty showers or isolated thunderstorms after 2 p.m. Any storm that does pop could fire off strong, gusty winds and brief but heavy downpours.
Thursday And Friday: Extreme Heat Watch
Thursday is expected to be the worst of it, with afternoon highs near 104°F and heat index readings that could approach or even top 110°F. An Extreme Heat Watch is in place for much of the region from Thursday morning through Friday evening, and this is one of those times when the safety advice is not optional. Staying in air conditioned spaces, cutting back on nonessential outdoor work and rearranging plans to avoid the hottest part of the day are strongly recommended. Overnight relief will be minimal, with temperatures likely stuck in the low 80s on Thursday night.
Plan For Independence Day
Fourth of July plans will need a heat plan. Saturday, July 4, is expected to reach a high near 101°F, with a chance of showers or thunderstorms after 2 p.m. If you are heading to parades, cookouts or fireworks, aim for early morning or later evening activities and make sure there is a shaded or indoor backup spot where people can cool off.
How To Stay Safe
Hydration and timing are key. Drink plenty of water, skip the alcohol if you can and limit heavy outdoor activity between 11 a.m. and 8 p.m. Move workouts, yard work and other strenuous tasks to the coolest parts of the day. Keep an eye on older neighbors, people who live alone and anyone with existing health conditions. Call 911 right away if someone shows signs of heat stroke, such as confusion, a very high body temperature or loss of consciousness.
Local Resources
The city plans to open Code Red cooling centers on extreme heat days. For locations and hours, call 311 and check with the Baltimore City Health Department. Public libraries, senior centers and select community sites often operate as cooling spots, so it is worth figuring out now where you could go if your air conditioning fails or you need a place to cool down for a few hours.
Bottom Line
This week’s heat wave brings dangerous daytime temperatures, very little overnight cooldown and a bump in the chance of afternoon storms. Plan around the heat through Friday, keep tabs on updated forecasts and be ready to adjust if advisories change or new cooling resources are announced.
