Castro Weather in May
Average highs run from 13°C on May 1 to 11°C on May 31, and lows from 8°C to 6°C. Normal precipitation for the month is 177 mm over about 19 wet days.
May day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
May at a glance
- Average high
- 12°C
- Average low
- 7°C
- Precipitation
- 177 mm
- Reanalysis high
- 17°CMay 13, 1998
- Reanalysis low
- 1°CMay 29, 2007
- Daylight
- 10 h 14 min to 9 h 17 min
- Cloud cover
- 77%
- Humidity
- 91%
- Dew point
- 8°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 |
|---|---|---|---|---|---|
| May 1 | 13°C | 8°C | 15°C 1993 | 5°C 2008 | 58% |
| May 2 | 13°C | 8°C | 16°C 2006 | 3°C 2001 | 60% |
| May 3 | 13°C | 8°C | 16°C 2008 | 3°C 2001 | 59% |
| May 4 | 13°C | 8°C | 15°C 2008 | 4°C 2007 | 59% |
| May 5 | 13°C | 8°C | 16°C 2012 | 3°C 1992 | 59% |
| May 6 | 13°C | 8°C | 17°C 1997 | 3°C 1992 | 60% |
| May 7 | 13°C | 8°C | 17°C 2018 | 4°C 2011 | 61% |
| May 8 | 13°C | 8°C | 15°C 2014 | 4°C 2011 | 60% |
| May 9 | 12°C | 7°C | 16°C 1997 | 5°C 2001 | 60% |
| May 10 | 12°C | 7°C | 16°C 1997 | 3°C 2009 | 60% |
| May 11 | 12°C | 7°C | 17°C 1996 | 2°C 2009 | 60% |
| May 12 | 12°C | 7°C | 16°C 2016 | 2°C 2009 | 61% |
| May 13 | 12°C | 7°C | 17°C 1998 | 4°C 2009 | 62% |
| May 14 | 12°C | 7°C | 15°C 1998 | 4°C 2008 | 63% |
| May 15 | 12°C | 7°C | 16°C 1998 | 3°C 2010 | 63% |
| May 16 | 12°C | 7°C | 17°C 1998 | 4°C 1999 | 63% |
| May 17 | 12°C | 7°C | 15°C 1998 | 3°C 2012 | 63% |
| May 18 | 12°C | 7°C | 15°C 2020 | 2°C 2008 | 65% |
| May 19 | 11°C | 7°C | 15°C 2015 | 2°C 2008 | 65% |
| May 20 | 11°C | 7°C | 14°C 2015 | 3°C 2019 | 66% |
| May 21 | 11°C | 7°C | 14°C 1998 | 3°C 1997 | 66% |
| May 22 | 11°C | 7°C | 16°C 1998 | 3°C 2014 | 66% |
| May 23 | 11°C | 6°C | 15°C 1998 | 2°C 2002 | 68% |
| May 24 | 11°C | 6°C | 17°C 1998 | 3°C 1993 | 67% |
| May 25 | 11°C | 6°C | 14°C 2020 | 2°C 2010 | 66% |
| May 26 | 11°C | 6°C | 14°C 1996 | 2°C 2010 | 66% |
| May 27 | 11°C | 6°C | 14°C 1996 | 1°C 2007 | 67% |
| May 28 | 11°C | 6°C | 14°C 2012 | 2°C 2010 | 67% |
| May 29 | 11°C | 6°C | 14°C 2003 | 1°C 2007 | 68% |
| May 30 | 11°C | 6°C | 14°C 2016 | 2°C 2008 | 70% |
| May 31 | 11°C | 6°C | 13°C 2004 | 2°C 1991 | 70% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT-4).
- May 1
- sunrise 7:45 AM, sunset 5:59 PM
- May 31
- sunrise 8:14 AM, sunset 5:31 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.