Weather · Washington, United States
Washington Weather in September
September in Washington averages 26°C by day and 17°C at night, with about 126mm of rain. That makes it one of the best months to visit.
Avg high
26°C
79°F
Avg low
17°C
63°F
Rainfall
126mm
#4 wettest of 12
What to pack
Summer clothes by day; a light layer for evenings. Bring a compact umbrella for the odd shower.
Timing a trip around the weather? A Local Friend in Washington builds it around the season for you.