Stock Island Weather in September
Average highs run from 89°F on September 1 to 88°F on September 30, and lows from 81°F to 79°F. Normal precipitation for the month is 8.08 in over about 15 wet days.
September day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
September at a glance
- Average high
- 89°F
- Average low
- 80°F
- Precipitation
- 8.08 in
- Record high
- 95°FSep 3, 2007
- Record low
- 69°FSep 17, 1985
- Chance of a freeze
- 0%
- Days of 90°F or more
- 15.4
- Daylight
- 12 h 37 min to 11 h 56 min
- Cloud cover
- 62%
- Humidity
- 77%
- Dew point
- 76°F
- Wind
- 10.3 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Sep 1 | 89°F | 81°F | 93°F 1989 | 73°F 1948 | 47% |
| Sep 2 | 89°F | 81°F | 93°F 1995 | 72°F 1952 | 48% |
| Sep 3 | 89°F | 80°F | 95°F 2007 | 70°F 1950 | 48% |
| Sep 4 | 89°F | 80°F | 94°F 1951 | 70°F 1958 | 48% |
| Sep 5 | 89°F | 80°F | 93°F 1993 | 73°F 1959 | 48% |
| Sep 6 | 89°F | 80°F | 92°F 1948 | 73°F 1952 | 48% |
| Sep 7 | 89°F | 80°F | 92°F 1951 | 73°F 1951 | 48% |
| Sep 8 | 89°F | 80°F | 94°F 1948 | 70°F 1960 | 49% |
| Sep 9 | 89°F | 80°F | 92°F 1989 | 71°F 1952 | 49% |
| Sep 10 | 89°F | 80°F | 92°F 1951 | 74°F 1952 | 49% |
| Sep 11 | 89°F | 80°F | 93°F 1951 | 74°F 1952 | 49% |
| Sep 12 | 89°F | 80°F | 94°F 2023 | 72°F 1948 | 49% |
| Sep 13 | 89°F | 80°F | 94°F 2023 | 71°F 1958 | 49% |
| Sep 14 | 89°F | 80°F | 95°F 2023 | 73°F 1969 | 49% |
| Sep 15 | 89°F | 80°F | 94°F 2023 | 74°F 2013 | 48% |
| Sep 16 | 89°F | 80°F | 93°F 2023 | 72°F 1948 | 48% |
| Sep 17 | 88°F | 80°F | 92°F 1951 | 69°F 1985 | 48% |
| Sep 18 | 88°F | 80°F | 93°F 2023 | 71°F 1950 | 48% |
| Sep 19 | 88°F | 80°F | 92°F 1987 | 71°F 1950 | 48% |
| Sep 20 | 88°F | 80°F | 95°F 2018 | 72°F 1948 | 48% |
| Sep 21 | 88°F | 80°F | 93°F 2020 | 72°F 1948 | 48% |
| Sep 22 | 88°F | 80°F | 93°F 1987 | 73°F 1948 | 48% |
| Sep 23 | 88°F | 80°F | 92°F 1987 | 73°F 2014 | 47% |
| Sep 24 | 88°F | 80°F | 92°F 1989 | 72°F 1963 | 47% |
| Sep 25 | 88°F | 80°F | 92°F 1957 | 74°F 1963 | 47% |
| Sep 26 | 88°F | 80°F | 92°F 1987 | 71°F 1948 | 47% |
| Sep 27 | 88°F | 79°F | 91°F 1962 | 72°F 1987 | 47% |
| Sep 28 | 88°F | 79°F | 93°F 2020 | 73°F 2001 | 46% |
| Sep 29 | 88°F | 79°F | 92°F 1958 | 71°F 1949 | 46% |
| Sep 30 | 88°F | 79°F | 92°F 1958 | 72°F 1957 | 46% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (EDT).
- September 1
- sunrise 7:08 AM, sunset 7:45 PM
- September 30
- sunrise 7:19 AM, sunset 7:15 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00012850 (Key West Nas), public domain. Records: NOAA GHCN-Daily, station USW00012836, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.