In September, Ellicott City typically sees daytime highs of 25.5°C and overnight lows around 13.5°C. Compared to the annual average high of 17.8°C, September runs +7.8°C.
September in Ellicott City averages a daytime high of 25.5°C and an overnight low of 13.5°C.
September runs +7.8°C compared to Ellicott City's annual average high of 17.8°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 25.5°C and cooler evenings around 13.5°C.