KIAD temperature trend
Washington Dulles International Airport
Temperature and dew point over time. The gap between them is what decides fog, and the temperature itself is what decides your density altitude and takeoff run.
Warmest
31 °C
Sep 13, 2026
Coldest
11 °C
Sep 24, 2026
Mean temperature
20.9 °C
Mean dew point
15.5 °C
658 archived observations · Archive updated continuously
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