September 1 is the start of a new season for meteorologists. We group seasons together in three full month periods. This is the start of Autumn for science records, even though the astronomical Autumn begins on September 22 at 9:30 AM.

Below you will find a look at the numbers for temperature and daylight for what we would normally expect throughout the month of September in Baltimore. But first, the weather outlook shows signs of the season trying to change.

NOAA Temperature Outlook

This Outlook is for NEXT WEEK (Days 8 to 14) shows a dramatic cool down expected in the middle of the nation. The west coast should be hot, while the east coast will be near normal to slightly warm. Our region is on the edge of that.

August 31 Temperature Trend


Jet Stream Forecast Model Simulation 

The GFS Model (which has performed rather well lately) shows the Jet Stream buckling with a deep trough next week. This will allow much cooler air to drop in from Canada.  Will we get it? Well, here it looks like we remain on the edge. It is possible we get a taste and some chilly nights when the skies clear.




Temperature Outlook: Translation

I think we will get some taste of the cool air one or two days next week, not shown here.  It’s more likely we get some nights that could drop into the 50s, if the skies clear and we get that trough to shift a little east.

August 31 Temperature Outlook Baltimore


Climate Data

The sun angle is getting lower, and daily sunlight is shrinking by more than 2 hours 30 minutes each day in Baltimore:

  • September 1:  Sunrise @ 6:35 AM ; Sunset @ 7:36 PM – Length of Day = 13 hours 00 minutes and 55 seconds.
  • September 30 Sunrise @ 7:02 AM; Sunset at 6:49 PM – Length of Day = 11 hours 47 minutes and 43 seconds.

That is about a loss of 1 hour 13 minutes daylight by the end of the month.


The Average Temperature Change 

Here’s the official climate data for Baltimore from the National Weather Service based on records since 1881.

Baltimore will average 11 degrees cooler by the end of the month.

The code at the top of each column:

  • DY = Day
  • NMX = Normal Max (high) Temperature
  • NMN = Normal Min (low) Temperature
  • RMX = Record Max/high Temperatures
  • LMX = Record cool high Temperatures
  • RMN = RMX = Record Main/low Temperatures
  • HIMN = Record warm low Temperatures
  • MXPCP = Max precipitation (daily rainfall)

September climate and recoed temperatures Baltimore

Hottest: 101ºF on Sept 7 in 1881

Coldest: 35ºF on Sept 25 in 1963

Note: Normal is NOT Normal! The weather often swings from warm to cool on either end.

This initial surge of chilly air is early, so it will subside and allow the warmth to return.  I would not suggest summer is completely over. Often a big drop in temps is matched by a warm up a week or two later.  But the strong of 90 degree days will be much harder to come by.  If you ask me, it wasn’t soon enough. But I guess I should save my opinion for snow season. FITF



Maryland Weather 

Maryland Weather Page

Get Your Local Maps And Forecast

I wanted to keep it simple. Just the basics for a quick view at any time.

Maryland Weather Just In Weather

14 Local Maryland Pages (and York PA)

We have made a page for Maryland Weather which gives you the current conditions for 14 present area locations. Many of these match up with the spots on our route.  Please use this list below are reference. I will include them daily with my articles on the kids.

Local Hourly Forecasts and Local Radar
Central Maryland
Southern Maryland





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



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.




Maryland Trek Team Shirt

All proceeds will go to the Just In Power Kids programs

Trek Team Shirt Gray

Maryland Trek Cycle Jerseys From Hill Killer

All proceeds will go to the Just In Power Kids programs



Also See:

July 2020 The hottest on record. Will it hint at snow this winter?


Record Hottest Month in Baltimore July 2020


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.MarylandStrongLoveJaiden


Related Posts

2020 Tropical Storm and Hurricane Names and Naming History

Tropical Storm Hurricane History


Atlantic Tropical History: Maps of Origin Regions Every 10 Days

13_Tropical Storm Formation Sep11_20


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.


Also See:

Double Solar Halo

Double solar halo June 8


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.