Saint Peter Port Weather in September
Average highs run from 18°C on September 1 to 17°C on September 30, and lows from 16°C to 15°C. Normal precipitation for the month is 60 mm over about 12 wet days.
September day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
September at a glance
- Average high
- 17°C
- Average low
- 16°C
- Precipitation
- 60 mm
- Reanalysis high
- 22°CSep 14, 2020
- Reanalysis low
- 12°CSep 26, 1993
- Daylight
- 13 h 27 min to 11 h 43 min
- Cloud cover
- 67%
- Humidity
- 83%
- Dew point
- 14°C
- Wind
- 24.1 km/h
Every day of the month
A wet day has at least 1 mm of precipitation in the reanalysis.
| Date | Normal high | Normal low | Reanalysis high | Reanalysis low | Chance wet |
|---|---|---|---|---|---|
| Sep 1 | 18°C | 16°C | 19°C 2011 | 14°C 1992 | 27% |
| Sep 2 | 18°C | 16°C | 19°C 2018 | 15°C 2015 | 26% |
| Sep 3 | 18°C | 16°C | 21°C 2005 | 14°C 2015 | 26% |
| Sep 4 | 18°C | 16°C | 20°C 2013 | 13°C 1992 | 27% |
| Sep 5 | 17°C | 16°C | 20°C 1999 | 14°C 1992 | 28% |
| Sep 6 | 18°C | 16°C | 19°C 2005 | 14°C 2013 | 29% |
| Sep 7 | 17°C | 16°C | 21°C 2016 | 14°C 2013 | 30% |
| Sep 8 | 17°C | 16°C | 20°C 2012 | 14°C 1992 | 32% |
| Sep 9 | 17°C | 16°C | 21°C 2004 | 14°C 1992 | 33% |
| Sep 10 | 17°C | 16°C | 20°C 1999 | 15°C 1996 | 33% |
| Sep 11 | 17°C | 16°C | 19°C 1999 | 13°C 1993 | 34% |
| Sep 12 | 17°C | 16°C | 20°C 2016 | 14°C 2012 | 34% |
| Sep 13 | 17°C | 16°C | 21°C 2016 | 13°C 1998 | 34% |
| Sep 14 | 17°C | 16°C | 22°C 2020 | 13°C 1994 | 35% |
| Sep 15 | 17°C | 16°C | 21°C 2020 | 13°C 1994 | 37% |
| Sep 16 | 17°C | 16°C | 20°C 2014 | 13°C 1994 | 37% |
| Sep 17 | 17°C | 16°C | 20°C 2003 | 13°C 1994 | 39% |
| Sep 18 | 17°C | 16°C | 19°C 2014 | 13°C 1994 | 40% |
| Sep 19 | 17°C | 16°C | 20°C 2014 | 13°C 1994 | 40% |
| Sep 20 | 17°C | 16°C | 21°C 2003 | 14°C 1994 | 40% |
| Sep 21 | 17°C | 15°C | 21°C 2006 | 14°C 1994 | 39% |
| Sep 22 | 17°C | 15°C | 19°C 1999 | 14°C 2015 | 40% |
| Sep 23 | 17°C | 15°C | 20°C 2000 | 13°C 2018 | 41% |
| Sep 24 | 17°C | 15°C | 20°C 2016 | 12°C 2020 | 43% |
| Sep 25 | 17°C | 15°C | 18°C 2000 | 13°C 2010 | 44% |
| Sep 26 | 17°C | 15°C | 19°C 1992 | 12°C 1993 | 45% |
| Sep 27 | 17°C | 15°C | 19°C 2011 | 12°C 2007 | 46% |
| Sep 28 | 17°C | 15°C | 20°C 2011 | 14°C 1995 | 48% |
| Sep 29 | 17°C | 15°C | 19°C 2011 | 13°C 1995 | 49% |
| Sep 30 | 17°C | 15°C | 20°C 2011 | 13°C 1996 | 49% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+1).
- September 1
- sunrise 6:26 AM, sunset 7:53 PM
- September 30
- sunrise 7:08 AM, sunset 6:51 PM
Other months
Sources
Cloud, humidity, wind and sunshine, and temperature and precipitation: 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 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.