Weather For September 21 2024. See the last few years weather in the united states in september 21. Get the monthly weather forecast for calendar, id, including daily high/low, historical averages, to help you plan ahead.

The average temperatures are between 26 ° c and 30 ° c, drinking water regularly is advisable. Explore comprehensive september 2026 weather forecasts for seattle, including daily high and low temperatures, precipitation risks, and monthly temperature trends.