Baltimore weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Good
Best time to visit: April – October
What is the weather like in Baltimore in September?
In September, Baltimore is warm: daytime highs average 25 °C, and nights cool down to about 18 °C. The sea averages 23.7 °C – pleasant for swimming. Expect around 6 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 120 mm in total. All in all, September is a good month for a holiday in Baltimore.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 71 | 78 | 79 |
| Day | 28° | 25° | 19° |
| Night | 21° | 18° | 11° |
| Sea | 26° | 24° | 18° |
| Sun | 7 h | 6 h | 6 h |
| Rain days | 11 | 10 | 8 |
More details for September
- Daylight
- 12 h 31 min06:47 – 19:17
- UV index
- 7 · highclear sky, noon (estimate)All months
- Muggy days
- 10 daysdew point 18 °C or moreAll months
- Wind
- 18 km/haverage daily peakAll months
- Cloud cover
- 53 %on averageAll months
- Hot days
- 2 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC−4America/New_York
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %48 %
- Few rainy daysweight 30 %61 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Rain jacket or umbrella
Baltimore in September: quick answers
Is Baltimore hot in September?
Warm rather than hot: in September, daytime highs in Baltimore average 25 °C and nights cool to about 18 °C. On about 2 days the thermometer climbs to 30 °C or more.
Can you swim in Baltimore in September?
Yes. In September the sea averages 23.7 °C – pleasant for swimming.
Does it rain much in Baltimore in September?
Rain is frequent, with about 10 rainy days and 120 mm in total.
Baltimore month by month
The whole year in BaltimoreAll destinations: USAWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences