Penryn Weather in September
Average highs run from 90°F on September 1 to 83°F on September 30, and lows from 62°F to 57°F. Normal precipitation for the month is 0.24 in over about 1 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
- 60°F
- Precipitation
- 0.24 in
- Record high
- 109°FSep 3, 1950
- Record low
- 34°FSep 15, 1906
- Chance of a freeze
- 0%
- Days of 90°F or more
- 10.7
- Daylight
- 13 h 01 min to 11 h 49 min
- Cloud cover
- 25%
- Humidity
- 35%
- Dew point
- 40°F
- Wind
- 6.0 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 | 90°F | 62°F | 104°F 1950 | 46°F 1914 | 2% |
| Sep 2 | 90°F | 61°F | 107°F 1950 | 41°F 1954 | 2% |
| Sep 3 | 90°F | 61°F | 109°F 1950 | 44°F 1919 | 3% |
| Sep 4 | 89°F | 61°F | 108°F 1950 | 41°F 1919 | 3% |
| Sep 5 | 89°F | 61°F | 106°F 1950 | 42°F 1919 | 3% |
| Sep 6 | 89°F | 61°F | 105°F 1923 | 40°F 1911 | 3% |
| Sep 7 | 89°F | 61°F | 106°F 1923 | 41°F 1919 | 3% |
| Sep 8 | 89°F | 61°F | 106°F 1923 | 41°F 1919 | 3% |
| Sep 9 | 88°F | 61°F | 105°F 1923 | 43°F 1919 | 3% |
| Sep 10 | 88°F | 61°F | 105°F 1944 | 41°F 1919 | 3% |
| Sep 11 | 88°F | 61°F | 105°F 1948 | 40°F 1912 | 3% |
| Sep 12 | 88°F | 60°F | 103°F 1948 | 39°F 1919 | 4% |
| Sep 13 | 88°F | 60°F | 104°F 1979 | 42°F 1926 | 4% |
| Sep 14 | 87°F | 60°F | 105°F 1971 | 42°F 1926 | 4% |
| Sep 15 | 87°F | 60°F | 104°F 1913 | 34°F 1906 | 4% |
| Sep 16 | 87°F | 60°F | 103°F 1913 | 40°F 1919 | 4% |
| Sep 17 | 87°F | 60°F | 106°F 1913 | 40°F 1909 | 4% |
| Sep 18 | 86°F | 59°F | 102°F 1913 | 40°F 1909 | 5% |
| Sep 19 | 86°F | 59°F | 100°F 1922 | 42°F 1908 | 5% |
| Sep 20 | 86°F | 59°F | 101°F 1939 | 41°F 1926 | 5% |
| Sep 21 | 86°F | 59°F | 100°F 1943 | 38°F 1926 | 5% |
| Sep 22 | 85°F | 59°F | 103°F 1949 | 35°F 1923 | 5% |
| Sep 23 | 85°F | 58°F | 104°F 1949 | 34°F 1923 | 6% |
| Sep 24 | 85°F | 58°F | 101°F 1947 | 39°F 1909 | 6% |
| Sep 25 | 85°F | 58°F | 99°F 1964 | 35°F 1923 | 6% |
| Sep 26 | 84°F | 58°F | 99°F 1963 | 37°F 1923 | 6% |
| Sep 27 | 84°F | 57°F | 102°F 1963 | 36°F 1919 | 6% |
| Sep 28 | 84°F | 57°F | 100°F 1963 | 36°F 1919 | 6% |
| Sep 29 | 83°F | 57°F | 99°F 1966 | 36°F 1919 | 7% |
| Sep 30 | 83°F | 57°F | 98°F 1966 | 34°F 2019 | 7% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PDT).
- September 1
- sunrise 6:34 AM, sunset 7:35 PM
- September 30
- sunrise 7:00 AM, sunset 6:49 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00040383 (Auburn), public domain. Records: NOAA GHCN-Daily, station USC00040383, 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.