Baltimore weather in September
September in Baltimore: warm, rainy, with clean air — one of the best months to visit.
#2 of 12 months in Baltimore · #276 of 897 destinations to visit in September · comfort 87/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Baltimore in September
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Baltimore climate normals — September
| Daytime high | 25°C / 78°F | 🌤 warm |
|---|---|---|
| Nighttime low | 18°C / 64°F | |
| Rainfall | 100 mm / 3.9 in | 🌧 rainy |
| Rainy days | 10 days | |
| Humidity | 73% | 💧 humid |
| Dew point | 15°C / 60°F | |
| Sunshine | 9.1 h/day | |
| Daylight | 12.4 h | |
| Wind | 17 km/h / 11 mph | |
| Air quality (US AQI) | 45 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Baltimore in September — FAQ
- Is September a good time to visit Baltimore?
- September in Baltimore: warm, rainy, with clean air — one of the best months to visit. It ranks #2 of 12 months for Baltimore on SeasonMap's comfort score (87/100).
- What is the weather like in Baltimore in September?
- In September, Baltimore averages a daily high of 25.4°C and a low of 17.5°C, with about 100.2 mm of rain over roughly 10.4 rainy days.
- What is the air quality in Baltimore in September?
- Baltimore has a mean US Air Quality Index of about 45 in September.