July 20 2020

Today should be the worst of this stretch. Temps will be comparable or a little hotter than yesterday when BWI reached 100ºF. The humidity will make it feel worse. Many areas will feel above 100ºF, but some may rise above 110ºF on the heat index.  This will be dangerous to be outside, and some experts began to mention wearing masks can add to early heat exhaustion.

Basically, if you can stay inside with air conditioning, this is the day to do that. Keep plenty of water to drink for you, kids, and pets.  Please do not walk dogs on pavement mid day through 7 PM.

Heat Advisory and Excessive Heat Warning

July 20 weather heat advisory


The Dew Point Tells A Lot

This is the true measure of moisture in the air. The Relative Humidity (RH) is a calculation of this and the actually temperature, so when it gets hotter, the RH goes down.

The Dew Point is where the moisture in the air will condense. The higher it is, the harder it is for your body to have sweat evaporate to cool you off.

The upper 70s on Delmarva is why there is an Excessive Heat Warning in place.

July 20 maryland weather dew point


Beach Fog

When the Dew Point is higher than the water temperature, fog forms. If you were at the beach on Sunday, you may not have seen the sun until AFTER noon because of this.

Beach Fog July 19


Morning Satellite Loop

This morning a slight wind from the west high limit how widespread the fog holds.




Afternoon Forecast

How Hot?

The NAM has us in the upper 90s, but this has been cooler than verified lately… The HRRR is hotter.

July 20 maryland weather High Temperatures Monday


The HRRR Model has many in central Maryland over 100ºF

July 20 maryland weather High Temperatures HRRR Monday


Heat Index Forecast

July 20 maryland weather Heat Index


Storm Relief

There may be a cluster of storms forming after 4 PM

As in recent months, there may be more storms than shown on the modeling.  With the high heat, any storms that form can contain dangerous lighting and high winds.

Radar Simulation —> Slider

previous arrow
next arrow
previous arrownext arrow

Climate Report Today

Record Rainfall set in Baltimore at BWI

See the Weather Observations and Climate Report from this morning for more info about:

July 20 moon phase

📋Observations yesterday

🌡 Climate data today

🗺 Weather Map

☀️ Sunrise and sunset times

🌙 Moon phase



Email Updates

Please make sure you sign up (above or click here to sign up for email alerts…. ) for my newsletter. This way you will get an email to make sure you are notified of each post.


Storm Outlook

Increased storm coverage each day this week, with a break by the weekend.



Temperature Outlook 

The peak of the heat should be Monday, but the pattern will not be noticeably improved until the end of the week.

July 20 maryland weather temperature outlook


That will be tough to challenge with some of the hottest already set on those days

July 20    102ºF in 1930    
July 21    104ºF in 1930   
July 22    106ºF in 2011   
July 23    102ºF in 2011+

Also See:

Comet NEOWISE Viewing All July (photos/video)

Comet NEOWISE Bob Gelety

Maryland Strong Love ❤️ 

My ‘bonus’ daughter made this map of Maryland a few years ago. We brought it back for needed positivity. Now on her pick of tanks, and this cool Maryland T for men or women.

Click here or on the image to see more

This is all LOCAL: Made by Maryland Print House; Proceeds support my Maryland Trek 7 this August for Just In Power Kids.




Please share your thoughts, best weather pics/video, or just keep in touch via social media


Maryland Trek 7 

This will go on this August! Let’s hope social distancing will be a memory then. One way to celebrate would be to become part of my team:

  • Consider joining our team for the week, a single day, or even as a sponsor.

Maryland Trek 7



Water Spout OR Scud Cloud on videos and photos near Middle River Maryland


Other  Links:

Was Your County Not Included?

Click this map for more on the regional forecast zones


Baltimore Weather At BWI May Not Be As Hot As Reported

Construction at the airport close to the weather station may be added artificial heat. Click here or the image for the details.




Maryland Trek Cycle Jerseys From Hill Killer

All proceeds will go to the Maryland Trek 6 total and Just In Power Kids programs

Thank you to our Title Sponsor for Maryland Trek 6

Shining on with Smyth and their contribution, our team has raised over $100,000 for Just In Power Kids to provide free programs for kids in and post cancer treatment.

Just In Power Kids:

Proceeds go to our programs Providing FREE holistic care for kids in cancer treatment and up to 5 years post treatment and caregivers.


Shine On

Proceeds from all sales go to Just In Power Kids. Click the image to shop and show your support.