Saint Johns County Weather in September
Average highs run from 89°F on September 1 to 85°F on September 30, and lows from 74°F to 71°F. Normal precipitation for the month is 7.18 in over about 14 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
- 87°F
- Average low
- 73°F
- Precipitation
- 7.18 in
- Record high
- 99°FSep 16, 1990
- Record low
- 51°FSep 19, 1981
- Chance of a freeze
- 0%
- Days of 90°F or more
- 8.2
- Daylight
- 12 h 45 min to 11 h 54 min
- Cloud cover
- 59%
- Humidity
- 81%
- Dew point
- 73°F
- Wind
- 8.3 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 | 74°F | 94°F 2007 | 68°F 1985 | 46% |
| Sep 2 | 89°F | 74°F | 93°F 2000 | 66°F 1985 | 46% |
| Sep 3 | 89°F | 74°F | 95°F 1978 | 66°F 1990 | 46% |
| Sep 4 | 89°F | 74°F | 96°F 2010 | 62°F 1990 | 46% |
| Sep 5 | 89°F | 74°F | 95°F 1993 | 67°F 1978 | 46% |
| Sep 6 | 89°F | 74°F | 93°F 1983 | 61°F 1990 | 46% |
| Sep 7 | 88°F | 74°F | 93°F 1977 | 66°F 1990 | 46% |
| Sep 8 | 88°F | 74°F | 96°F 1990 | 63°F 1990 | 45% |
| Sep 9 | 88°F | 74°F | 95°F 1993 | 66°F 1981 | 45% |
| Sep 10 | 88°F | 74°F | 93°F 1976 | 66°F 1997 | 45% |
| Sep 11 | 88°F | 74°F | 95°F 2015 | 65°F 1990 | 45% |
| Sep 12 | 88°F | 74°F | 97°F 2010 | 67°F 1989 | 45% |
| Sep 13 | 88°F | 74°F | 94°F 1984 | 66°F 1989 | 44% |
| Sep 14 | 88°F | 74°F | 94°F 1987 | 64°F 1982 | 44% |
| Sep 15 | 88°F | 73°F | 93°F 1990 | 61°F 1976 | 44% |
| Sep 16 | 88°F | 73°F | 99°F 1990 | 55°F 1976 | 44% |
| Sep 17 | 87°F | 73°F | 93°F 1987 | 63°F 2001 | 44% |
| Sep 18 | 87°F | 73°F | 96°F 1987 | 58°F 1976 | 44% |
| Sep 19 | 87°F | 73°F | 94°F 1987 | 51°F 1981 | 43% |
| Sep 20 | 87°F | 73°F | 95°F 1987 | 55°F 1981 | 43% |
| Sep 21 | 87°F | 73°F | 92°F 2009 | 62°F 1981 | 43% |
| Sep 22 | 87°F | 73°F | 98°F 1990 | 62°F 1994 | 43% |
| Sep 23 | 87°F | 73°F | 95°F 1990 | 62°F 1982 | 42% |
| Sep 24 | 86°F | 72°F | 93°F 2009 | 54°F 1990 | 42% |
| Sep 25 | 86°F | 72°F | 92°F 1988 | 61°F 2008 | 42% |
| Sep 26 | 86°F | 72°F | 94°F 1993 | 61°F 1975 | 41% |
| Sep 27 | 86°F | 72°F | 92°F 1993 | 60°F 1982 | 41% |
| Sep 28 | 86°F | 72°F | 95°F 1974 | 61°F 1987 | 40% |
| Sep 29 | 86°F | 71°F | 92°F 2009 | 59°F 1993 | 40% |
| Sep 30 | 85°F | 71°F | 92°F 2009 | 58°F 1993 | 39% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (EDT).
- September 1
- sunrise 7:03 AM, sunset 7:48 PM
- September 30
- sunrise 7:18 AM, sunset 7:12 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00087826 (St Augustine Lighthouse), public domain. Records: NOAA GHCN-Daily, station USC00087826, 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.