Baltimore, MD weather in September
Baltimore is warm in September, with some rain: highs average 80°F and nights drop to about 59°F. There are about 9 days with rain. A good month for most outdoor plans.
- Normal high
- 80°F
- Normal low
- 59°F
- Wet days
- 9
- 4.4 in total
- Muggy days
- 8
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 84°F | 74°F |
| Normal low | 63°F | 53°F |
| Chance of a wet day | 28% | 30% |
| Sunrise / sunset | 6:35 am / 7:37 pm | 7:01 am / 6:51 pm |
| Daylight | 13.1 h | 11.8 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Eastern Time).
A typical September day
- 6 am62°Fdew point 58°F
- 9 am70°Fdew point 60°F
- Noon76°Fdew point 59°F
- 3 pm77°Fdew point 58°F
- 6 pm73°Fdew point 59°F
- 9 pm67°Fdew point 60°F
NOAA hourly normals (local standard time) from Baltimore Wash Intl Airport (9 mi away); average wind 6 mph; clear or few clouds in 48% of daytime hours, mostly cloudy or overcast in 39%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F11 of 30
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph12 of 30
- Hot dayshigh 90°F or more3 of 30
- Muggy daysdaily mean dew point 65°F or more8 of 30
- Wet daysat least 0.01 in of rain or melted snow9 of 30
- Notable rainat least 0.10 in6 of 30
- Freezing nightslow 32°F or below0 of 30
- Snow on the groundsnow depth 1 in or more0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 4.4 in; a dry September brings about 2.0 in and a wet one about 5.9 in (25th and 75th percentiles). About 3 days bring half an inch or more, and about 1 an inch or more.
How September varies from year to year
- Warmest September, 1991-20202019: average high 86°F
- Coolest September2006: average high 74°F
- Wettest September2011: 13.3 in
- Driest September2019: 0.2 in
- Highest reading98°F (September 11, 2019)
- Lowest reading40°F (September 22, 2020)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 87°F | 80°F | 68°F |
| Normal low | 66°F | 59°F | 47°F |
| Wet days | 10 | 9 | 9 |
| Comfortable days | 2 | 11 | 15 |
| Daylight | 13.7 h | 12.4 h | 11.2 h |
Highs change by -7°F from August and -12°F into October.
Nearby alternatives in September
- Cooler: Stamford, CT203 mi · high 74°F · 10 wet days
How Baltimore ranks in September
- Normal high201st warmest of 378 cities; 1st of 3 in Maryland
- Wet days259th driest of 378
- Comfortable days144th most of 342
What to pack for Baltimore in September
- A rain jacket or umbrella – rain on about 9 days
- A swimsuit – about 12 beach days
Heating and cooling
September has 36 heating degree days and 163 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is Baltimore in September?
The normal high is 80°F and the normal low is 59°F. From 1991 to 2020 the hottest September reading was 98°F (most recently on September 11, 2019).
Does it rain a lot in Baltimore in September?
About 9 days in September have at least 0.01 in of precipitation, and the normal total is 4.4 in. The wettest September in 1991-2020 was in 2011 (13.3 in); the driest was in 2019 (0.2 in).
Is September a good time to visit Baltimore?
September ranks 4th of 12 months on our comfort score for Baltimore (61 out of 100). It has about 11 comfortable days and about 3 days at 90°F or hotter. The best months are April and May.
Where the numbers come from
- Temperature, rain, snowfall, snow depth and humidity and wind by hour: Baltimore Wash Intl Airport (USW00093721), 9.4 mi SSW of the city center, 156 ft (120 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Frost dates: Md Sci Ctr Baltimore (USW00093784), 0.7 mi SSE of the city center, 20 ft . NOAA normals and daily records, 1991-2020.
- Cloud cover: Camp Springs Andrews AFB (USW00013705), 36 mi SSW of the city center, 282 ft (246 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Baltimore-Washington Intl Airport (724060-93721), 9.0 mi SSW of the city center, 138 ft (102 ft higher than the city). Hourly observations, 1991-2020.