How much time does it take for DC weather to transition from summer to fall?

Asked on: 7/26/2025

This question has been asked1times.

The transition from summer to fall in Washington, DC typically takes about 3-4 weeks.

Estimated Duration: 21 days

In Washington, DC, the shift from summer to fall usually occurs gradually over 3-4 weeks, typically starting in late September and stabilizing by mid-October. During this period, temperatures slowly drop from summer highs (around 85°F/29°C) to milder fall averages (60-70°F/15-21°C). The transition involves decreasing humidity, cooler nights, and changing foliage. Weather patterns can vary yearly, but consistent cooling trends and shorter daylight hours mark the seasonal change. Monitoring local forecasts and historical climate data helps predict the exact timing each year.