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Get the monthly weather forecast for Washington, DC, including daily high/low, historical averages, to help you plan ahead.
In Washington, D.C. during September average daily high temperatures decrease from 83°F to 73°F and it is overcast or mostly cloudy about 36% of the time.
Check accurate weather in September in Washington DC. Expect Washington DC September temperature around 27°C (81°F). Read clothing tips & recommended activities.
Weather in September. On average, September weather in DC is really pleasant. In fact, DC weather expert Jason Samenow told the Trip Hacks DC podcast that September is one of his favorite months for DC weather. That might be for several reasons: The average daily high is 81°F.
The clearest month of the year in Washington, D.C. is September, during which on average the sky is clear, mostly clear, or partly cloudy 64% of the time. The cloudier part of the year begins around November 13 and lasts for 7.7 months, ending around July 2.
The daily range of reported temperatures (gray bars) and 24-hour highs (red ticks) and lows (blue ticks), placed over the daily average high (faint red line) and low (faint blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. Hourly Temperature in September 2021 in Washington, D.C. Fall 2021. Link. Download. Compare.
This page contains a list of the average monthly high and low temperatures in Washington D.C. for the month of September each year between 1851 and 2024. It is based on NOAA data.
