July 21 Weather A Pleasant Break From Humidity For A Few Days Then Heat Dome Back Later This Week
Monday, July 21 2025
Morning Report
The storms from over the weekend and, in fact, the last few weeks will leave our region. Some morning clouds will depart to the south as a new air mass from Canada arrives from the north. With this comes a dramatic drop in humidity, and temperatures may actually drop below average.
This means sunny, comfortable days. The nights will be welcoming to open the windows and even chilly in the suburbs and farther inland mountains.
Enjoy the few days of a break. That heat dome will return later in the week, perhaps with another Heat Advisory by Friday and storms blossoming over the weekend.
Morning Temperatures
Clear sky to the North where temps are in the mid to lower 60s in PA. Clouds in Central and Southern Maryland will be moving away as the North wind moves in.
Surface Weather
Here it is! A fresh Canadian Air Mass is pushing in on a North wind. This has lower humidity AND a drop in temperature. The net result will be a pleasant few days for us.
The Heat Dome has shifted to the Gulf States, also shifting that ring of fire storm track.
We will watch this return later in the week.
Forecast Today
Wind Forecast
Snapshot at 4 PM
Afternoon Temperatures
CLIMATE DATA: Baltimore
Yesterday: Low 73F; High 90F
Rainfall = Trace
TODAY July 21
Sunrise at 5:58 AM
Sunset at 8:28 PM
Normal Low in Baltimore: 68ºF
Record 53ºF in 1966
Normal High in Baltimore: 89ºF
Record 104ºF 1930
Rainfall Deficit at BWI
- Ending 2024 = -8.00”
- Since Jan 1 = +0.11”
- We are STILL DOWN -7.89” INCLUDING LAST YEAR
Drought Monitor
FINALLY: No Drought! There is still a long-term deficit plotted for Baltimore and Harford Counties.
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TUESDAY
Morning Temperatures
Afternoon Temperatures
Looking Ahead
- Heat Dome SHIFTS SOUTH for a few days
- Temps JUMP Back Up By Thursday AND Friday
- Next Weekend: Thunderstorms Return
Jet Stream Monday
Jet Stream Forecast This Week
Jet Stream Friday
7 Day Forecast
- A nice break from the humidity will be noticed for a few days.
- High heat builds later in the week.
- Friday ‘could’ have a Heat Advisory with Heat Index values up to 105°F.
- New weekend brings back the storms.
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RESTATING MY MESSAGE ABOUT DYSLEXIA
I am aware there are some spelling and grammar typos and occasional other glitches. I take responsibility for my mistakes and even the computer glitches I may miss. I have made a few public statements over the years, but if you are new here, you may have missed it: I have dyslexia and found out during my second year at Cornell University. It didn’t stop me from getting my meteorology degree and being the first to get the AMS CBM in the Baltimore/Washington region. One of my professors told me that I had made it that far without knowing and to not let it be a crutch going forward. That was Mark Wysocki, and he was absolutely correct! I do miss my mistakes in my own proofreading. The autocorrect spell check on my computer sometimes does an injustice to make it worse. I also can make mistakes in forecasting. No one is perfect at predicting the future. All of the maps and information are accurate. The ‘wordy’ stuff can get sticky. There has been no editor who can check my work while writing and to have it ready to send out in a newsworthy timeline. Barbara Werner is a member of the web team that helps me maintain this site. She has taken it upon herself to edit typos when she is available. That could be AFTER you read this. I accept this and perhaps proves what you read is really from me… It’s part of my charm. #FITF