Castro Weather in September
Average highs run from 10°C on September 1 to 12°C on September 30, and lows from 5°C to 6°C. Normal precipitation for the month is 114 mm over about 18 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
- 11°C
- Average low
- 5°C
- Precipitation
- 114 mm
- Reanalysis high
- 20°CSep 26, 2019
- Reanalysis low
- 0°CSep 1, 2010
- Daylight
- 11 h 09 min to 12 h 31 min
- Cloud cover
- 74%
- Humidity
- 87%
- Dew point
- 6°C
- Wind
- 11.5 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 | 10°C | 5°C | 15°C 2020 | 0°C 2010 | 67% |
| Sep 2 | 10°C | 5°C | 13°C 2012 | 2°C 1995 | 66% |
| Sep 3 | 10°C | 5°C | 13°C 2016 | 2°C 2019 | 65% |
| Sep 4 | 10°C | 5°C | 14°C 2016 | 2°C 2019 | 64% |
| Sep 5 | 10°C | 5°C | 14°C 2001 | 2°C 1992 | 61% |
| Sep 6 | 11°C | 5°C | 14°C 2020 | 2°C 1992 | 60% |
| Sep 7 | 11°C | 5°C | 14°C 1992 | 1°C 2000 | 58% |
| Sep 8 | 11°C | 5°C | 13°C 1992 | 1°C 2000 | 58% |
| Sep 9 | 11°C | 5°C | 15°C 1992 | 1°C 2017 | 58% |
| Sep 10 | 11°C | 5°C | 12°C 2002 | 1°C 2000 | 57% |
| Sep 11 | 11°C | 5°C | 14°C 2001 | 1°C 2000 | 57% |
| Sep 12 | 11°C | 5°C | 14°C 2007 | 2°C 1998 | 56% |
| Sep 13 | 11°C | 5°C | 16°C 2008 | 2°C 1998 | 57% |
| Sep 14 | 11°C | 5°C | 14°C 1993 | 2°C 2000 | 57% |
| Sep 15 | 11°C | 5°C | 15°C 2001 | 2°C 2015 | 55% |
| Sep 16 | 11°C | 5°C | 16°C 2001 | 3°C 2015 | 54% |
| Sep 17 | 11°C | 5°C | 15°C 1996 | 2°C 2016 | 53% |
| Sep 18 | 11°C | 5°C | 14°C 2016 | 3°C 2020 | 52% |
| Sep 19 | 11°C | 5°C | 15°C 2011 | 2°C 2020 | 52% |
| Sep 20 | 12°C | 6°C | 16°C 2008 | 4°C 2020 | 53% |
| Sep 21 | 12°C | 6°C | 16°C 2008 | 3°C 1992 | 54% |
| Sep 22 | 12°C | 6°C | 15°C 2011 | 2°C 2019 | 55% |
| Sep 23 | 12°C | 6°C | 16°C 1996 | 3°C 1992 | 56% |
| Sep 24 | 12°C | 6°C | 17°C 1996 | 3°C 2007 | 56% |
| Sep 25 | 12°C | 6°C | 17°C 1996 | 3°C 1992 | 55% |
| Sep 26 | 12°C | 6°C | 20°C 2019 | 3°C 2013 | 55% |
| Sep 27 | 12°C | 6°C | 16°C 2019 | 3°C 2013 | 54% |
| Sep 28 | 12°C | 6°C | 17°C 1995 | 3°C 2013 | 52% |
| Sep 29 | 12°C | 6°C | 19°C 2001 | 2°C 2018 | 52% |
| Sep 30 | 12°C | 6°C | 16°C 2009 | 2°C 2018 | 51% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT-3).
- September 1
- sunrise 7:21 AM, sunset 6:30 PM
- September 30
- sunrise 7:30 AM, sunset 8:01 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.