Will I be cold?
Will I be cold in Washington DC in August?
Verdict
No — No, comfortable.
Lows stay near 71°F — you won't be reaching for the puffer.
Day vs. night
Day
88°F
Hot
Prioritize shade, hydration, and a brim.
Night
71°F
Comfortable
Comfortable outside without an extra layer.
Why
Washington DC in August averages highs of 88°F, lows of 71°F, 9 rainy days.
You can pack for the daytime temps and not worry about the evening dip.