September was “an ideal late-summer month,” Richard G. Hendrickson wrote in his monthly weather report from Bridgehampton.
Mr. Hendrickson, a United States Cooperative weather observer, recorded daytime highs in the 70s during the first half of the month and mainly in the 60s in the second half. Nights began mainly in the 60s, then dropped mostly into the 40s by month’s end.
The hottest day last month was Sept. 11, when it was 85 degrees. The coldest temperature of the month was 38 degrees on the 18th.