September 20th, 2003 was a Saturday.
Wednesday
Thursday.
Wednesday
Sunday
A Friday.
Monday
The fall season is from September 22 to December 20.
September 20 1970 was a Sunday.
It can be any day...if by day you mean the day of the week, i.e., Thursday, etc. But the date of fall usually falls (nyuck nyuck) between September 20 and September 23 in the northern hemisphere.
In North America, the first day of fall is considered to be on September's equinox. Every year, there is another equinox around March 20.
It formed on 6 September and ended on 20 September 2003.
From around 20 March to around 22 September, the sun is directly over the northern hemisphere. From around 22 September to around 20 March, the sun is directly over the southern hemisphere.