Washington Weather in September

With daytime temperatures of 18°C (64°F) and nighttime lows of 10°C (50°F), September in Washington brings pleasant temperatures during the day. Do keep in mind that quite a bit of rainfall is typical. Around 61 mm (2.4 in) falls on average.

Rainfall in Washington in September

Expect around 14 days of rain based on historical data, with 61 mm (2.4 in) average. Neither particularly heavy nor particularly frequent, the rain this month is about average. A light jacket should be enough on most wet days.

Temperature in Washington in September

In September, expect pleasant temperatures in Washington, with highs of 18°C (64°F) and lows of 10°C (50°F) at night. The difference between afternoon and evening temperatures is usually noticeable. With overnight lows of 10°C (50°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.

Sunshine in Washington in September

The area enjoys a balanced 140 hours of sunlight, ensuring it's neither too overcast nor too sunny.

If you prefer enjoying temperate temperatures and rain-free days, July and August typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.