Darien Weather in September
Average highs run from 88°F on September 1 to 83°F on September 30, and lows from 73°F to 68°F. Normal precipitation for the month is 5.87 in over about 11 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
- 86°F
- Average low
- 71°F
- Precipitation
- 5.87 in
- Record high
- 101°FSep 5, 1921
- Record low
- 45°FSep 30, 1967
- Chance of a freeze
- 0%
- Days of 90°F or more
- 7.0
- Daylight
- 12 h 47 min to 11 h 53 min
- Cloud cover
- 59%
- Humidity
- 78%
- Dew point
- 71°F
- Wind
- 8.1 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 | 88°F | 73°F | 99°F 1926 | 64°F 1934 | 38% |
| Sep 2 | 88°F | 73°F | 98°F 1952 | 61°F 1967 | 38% |
| Sep 3 | 88°F | 73°F | 99°F 1917 | 64°F 1934 | 38% |
| Sep 4 | 88°F | 73°F | 100°F 1925 | 64°F 1918 | 38% |
| Sep 5 | 88°F | 73°F | 101°F 1921 | 61°F 1897 | 38% |
| Sep 6 | 88°F | 73°F | 101°F 1921 | 64°F 1946 | 38% |
| Sep 7 | 88°F | 73°F | 100°F 1921 | 63°F 1984 | 38% |
| Sep 8 | 87°F | 73°F | 100°F 1921 | 60°F 1897 | 37% |
| Sep 9 | 87°F | 73°F | 99°F 1925 | 59°F 1897 | 37% |
| Sep 10 | 87°F | 72°F | 99°F 1945 | 60°F 1956 | 37% |
| Sep 11 | 87°F | 72°F | 100°F 1985 | 58°F 1914 | 37% |
| Sep 12 | 87°F | 72°F | 101°F 1983 | 55°F 1897 | 36% |
| Sep 13 | 87°F | 72°F | 95°F 1920 | 57°F 1897 | 36% |
| Sep 14 | 86°F | 72°F | 96°F 1938 | 60°F 1964 | 36% |
| Sep 15 | 86°F | 72°F | 97°F 1972 | 55°F 1897 | 36% |
| Sep 16 | 86°F | 72°F | 98°F 1927 | 57°F 1897 | 36% |
| Sep 17 | 86°F | 71°F | 98°F 1972 | 60°F 1897 | 35% |
| Sep 18 | 86°F | 71°F | 98°F 1931 | 58°F 1897 | 35% |
| Sep 19 | 86°F | 71°F | 98°F 1925 | 51°F 1981 | 35% |
| Sep 20 | 85°F | 71°F | 99°F 1925 | 51°F 1897 | 35% |
| Sep 21 | 85°F | 70°F | 101°F 1925 | 56°F 1918 | 34% |
| Sep 22 | 85°F | 70°F | 99°F 1925 | 54°F 1918 | 34% |
| Sep 23 | 85°F | 70°F | 96°F 1921 | 54°F 1918 | 34% |
| Sep 24 | 85°F | 70°F | 96°F 1925 | 56°F 1982 | 33% |
| Sep 25 | 84°F | 69°F | 95°F 1961 | 54°F 1983 | 33% |
| Sep 26 | 84°F | 69°F | 95°F 1931 | 54°F 1940 | 32% |
| Sep 27 | 84°F | 69°F | 94°F 1958 | 53°F 1940 | 32% |
| Sep 28 | 84°F | 68°F | 95°F 1986 | 54°F 1983 | 32% |
| Sep 29 | 83°F | 68°F | 95°F 1944 | 53°F 1967 | 31% |
| Sep 30 | 83°F | 68°F | 94°F 1944 | 45°F 1967 | 31% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (EDT).
- September 1
- sunrise 7:02 AM, sunset 7:49 PM
- September 30
- sunrise 7:19 AM, sunset 7:12 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00097808 (Sapelo Is), public domain. Records: NOAA GHCN-Daily, station USC00091340, 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.