Next Monday will be the last trading day (LTD) of September.
As explained in the 2013 edition of the Almanac the LTDs of months used to be stronger than average, but in recent years they have been weak. This is quite different from the first trading days of months which strongly out-perform the average for all days, and where the effect has strengthened in recent years.
Since 1984 the market has on average fallen 0.05% on the LTD of September, which makes it 10th in the ranking of month LTDs.
Since 2000 the average change on the September LTD has been even weaker at -0.35%, the market has only risen three times in the last 13 years on the this day, making it the weakest LTD of all.
The following chart shows the FTSE 100 Index returns for every September LTD since 1984.