September 1 marks the start of a new season for meteorologists. Summarize the seasons into three full months. This marks the beginning of autumn in the scientific record and continues through the end of November. The astronomical beginning of autumn is the autumnal equinox on September 22nd at 9:03 PM.
Here are the temperature numbers from the National Weather Service, as well as the sun, wind, and water temperatures you’d typically expect in September in and around Baltimore.
In Baltimore, the sun angle is getting lower, and the daily sunlight is shrinking by more than 2 hours and 30 minutes each day.
- September 1: Sunrise @ 6:35 AM. Sunset @ 7:37 PM – Day Length = 13 hours 02 minutes 07 seconds.
- Sunrise on September 30 @ 7:01 AM. Sunset at 6:50 PM – Day Length = 11 hours 48 minutes 56 seconds.
This equates to approximately 1 hour, 13 minutes and 11 seconds of daylight lost by the end of the month.
Check the daily sun time and changes in the ‘Currents’ tab on the right –>
Average temperature change
This is the National Weather Service’s official climate data for Baltimore, based on records since 1881.
Baltimore will average 11 degrees cooler by the end of the month.
Code at the top of each column:
- DY = day
- NMX = normal maximum (high) temperature
- NMN = lowest (low) normal temperature
- RMX = record max/max temperature
- LMX = record low maximum temperature
- RMN = RMX = Record main/low temperature
- HIMN = warmest minimum temperature on record
- MXPCP = maximum precipitation (daily precipitation)
- Hottest: 101 degrees Fahrenheit on September 7, 1881
- Minimum temperature: 35 degrees Fahrenheit on September 25, 1963
- Wettest: 13.32 inches in 2011
- driest: 0.09 inches in 1884
Note: Normal is not normal! The weather often changes from warm to cool at either end.
Warming up is often a week or two after a significant drop in body temperature. But getting a series of 90 degree days is much more difficult.
I heard many people complaining that the spring winds were particularly strong. But be careful these days. Let’s take a look at the monthly average wind speed. The lowest average winds are found here in the summer, but winds are likely to pick up from this month into the fall as the seasonal shift to cooler weather progresses.
Chesapeake Bay water temperature
Water temperatures peak at the end of summer, when the days are longest and months after the highest sun angle. This is typically similar to the daily maximum temperature several hours after noon.
See the daily weather for the Chesapeake Bay here.
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I am aware that there are spelling and grammar typos. I have made several official statements over the years which you may have missed if you are here for the first time.
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