Washington Weather in September

During September, Washington experiences high daytime temperatures of 27°C (81°F) and cooler nights around 17°C (63°F). Expect quite a bit of rainfall. Around 94 mm (3.7 in) is typical.

Rainfall in Washington in September

Climate statistics over the past 30 years suggest around 9 days of rain, with 94 mm (3.7 in) average for the month. The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.

Temperature in Washington in September

September is a excellent month in Washington, with 27°C (81°F) during the day and 17°C (63°F) at night. Overall, the month follows a fairly predictable daily temperature pattern. Nights cool down to 17°C (63°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.

Sunshine in Washington in September

The city usually sees around 225 hours of sunlight, indicating many sunny days , a great month for sightseeing.

Wind Speed in Washington in September

Wind speeds average 4 m/s (8 knots) during September. At this speed, expect moderate winds that can raise dust and move small branches. Since this is an average, some days have gentle light winds while others experience stronger breezes that are quite noticeable.

So this is a great month to visit if you prefer dry days with pleasant temperatures.