Number of days in September: 30 days
National holidays:
Labor Day (September 2) - Public holiday celebrated on the first Monday in September. It honors the American labor movement and the contributions that workers have made to the strength, prosperity, laws and well-being of the country.
Observances:
Patriot Day (September 11) - Observed as the National Day of Service and Remembrance, occurs on September 11 of each year in memory of the people killed in the September 11 attacks of 2001.