The average high/low of the past eight days was an unseasonably cool 68°/51°, nearly ten degrees below average. This cool period wasn't associated with wet weather, as just 0.01" of rain fell.
Yesterday's soaking, all-day rain, which totaled 2.86", continued unabated today and flooded the City with an additional 4.16" (the heaviest rain ended later in the afternoon) - and the rain would continue as showers through midday on 9/16. The day was also very chilly, with temperatures mostly in the mid-50s, nearly 20 degrees below average.
This was the fifth day in a row with a low in the 70s. Ranging from 72° to 74°, the average low during these days was 73°, eleven degrees above average (and what you'd expect during a heat wave in July or August). Highs during these days ranged from 85° to 89°.
For the fourth day in a row the low temperature was 58°, four degrees below average. Each day, however, had a different afternoon high.
Today was the year's 39th, and last, day with a high of 90+, tying 1991 for the most hot days in one year. However, this year's hot days were more concentrated, occurring in a span of 128 days (between May 11 and Sept. 15) while 1991's occurred over the course of 163 days (April 8 - Sept. 17).
Early morning showers between 3-6 AM amounted to 0.08", making this the sixth year in a row in which rain fell on this date (and in eight of the past nine years).
Today, with a high/low of 69°/58°, had the first high in the 60s and first low in the 50s since 6/7 and 6/10, respectively. Only three other Septembers have had their first reading in the 50s occur later (last year it happened on 9/16 and in 2016 and 1947 it fell on 9/17). And the 98 days between the years last two lows in the 50s was the second longest gap on record (behind 1996's 104 days).