Average temperatures, rainfall and packing tips for Washington, United States in September
🌡️ Avg high
25°C
🌙 Avg low
16°C
🌧️ Rainfall
~121 mm
📊 Warmth rank
#4 of 12
September in Washington at a glance
September in Washington is typically warm, with average daytime highs around 25°C and nights near 16°C. Temperature-wise it sits mid-range for Washington (the 4th warmest month).
September is one of the wetter months in Washington, with around 121 mm of rain - plan around showers.
What to pack for Washington in September
T-shirts and light layers
A light jacket or sweater for the evenings
A rain jacket or umbrella - this is one of the wetter months
Washington - year at a glance
HighLow · September highlighted
Is September a good time to visit Washington?
🧳 September is one of the most comfortable months to visit Washington - daytime temperatures sit in a pleasant range and it's a good pick for sightseeing and time outdoors.
In September, Washington averages a daytime high of about 25°C and a night-time low of around 16°C, based on recent historical data.
Does it rain in Washington in September?
September is one of the wetter months in Washington, with around 121 mm of rain - plan around showers.
Is September a good time to visit Washington?
September is one of the most comfortable months to visit Washington - daytime temperatures sit in a pleasant range and it's a good pick for sightseeing and time outdoors.