Harlingen Weather in May
Average highs run from 14°C on May 1 to 17°C on May 31, and lows from 7°C to 11°C. Normal precipitation for the month is 59 mm over about 12 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
- 15°C
- Average low
- 9°C
- Precipitation
- 59 mm
- Reanalysis high
- 25°CMay 27, 2017
- Reanalysis low
- 3°CMay 1, 2013
- Daylight
- 15 h 02 min to 16 h 35 min
- Cloud cover
- 70%
- Humidity
- 80%
- Dew point
- 9°C
- Wind
- 19.8 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 | 14°C | 7°C | 21°C 1993 | 3°C 2013 | 39% |
| May 2 | 14°C | 8°C | 18°C 1995 | 4°C 2016 | 39% |
| May 3 | 14°C | 8°C | 20°C 1995 | 4°C 2011 | 38% |
| May 4 | 14°C | 8°C | 21°C 1995 | 5°C 1996 | 38% |
| May 5 | 14°C | 8°C | 21°C 1995 | 4°C 2011 | 38% |
| May 6 | 14°C | 8°C | 21°C 2018 | 4°C 1993 | 37% |
| May 7 | 14°C | 8°C | 22°C 2016 | 4°C 1997 | 36% |
| May 8 | 14°C | 8°C | 23°C 2018 | 3°C 1997 | 36% |
| May 9 | 14°C | 8°C | 23°C 2018 | 5°C 1991 | 36% |
| May 10 | 15°C | 8°C | 22°C 2008 | 5°C 2010 | 37% |
| May 11 | 15°C | 9°C | 23°C 1998 | 4°C 2010 | 37% |
| May 12 | 15°C | 9°C | 24°C 1998 | 5°C 2005 | 37% |
| May 13 | 15°C | 9°C | 21°C 1998 | 5°C 2019 | 37% |
| May 14 | 15°C | 9°C | 23°C 2000 | 5°C 2020 | 37% |
| May 15 | 15°C | 9°C | 24°C 2000 | 5°C 1996 | 37% |
| May 16 | 15°C | 9°C | 23°C 2000 | 4°C 1996 | 36% |
| May 17 | 15°C | 9°C | 23°C 1997 | 5°C 1996 | 36% |
| May 18 | 15°C | 9°C | 21°C 1997 | 4°C 2005 | 36% |
| May 19 | 15°C | 9°C | 20°C 2014 | 6°C 1995 | 36% |
| May 20 | 16°C | 10°C | 22°C 2014 | 6°C 1995 | 37% |
| May 21 | 16°C | 10°C | 22°C 2020 | 5°C 1995 | 37% |
| May 22 | 16°C | 10°C | 23°C 2012 | 4°C 1995 | 38% |
| May 23 | 16°C | 10°C | 24°C 2012 | 5°C 2013 | 38% |
| May 24 | 16°C | 10°C | 23°C 1992 | 4°C 2013 | 37% |
| May 25 | 16°C | 10°C | 23°C 1992 | 7°C 2013 | 35% |
| May 26 | 17°C | 10°C | 24°C 2018 | 7°C 2010 | 35% |
| May 27 | 17°C | 11°C | 25°C 2017 | 8°C 2004 | 37% |
| May 28 | 17°C | 11°C | 25°C 2018 | 7°C 1994 | 38% |
| May 29 | 17°C | 11°C | 24°C 2018 | 6°C 1994 | 38% |
| May 30 | 17°C | 11°C | 24°C 2018 | 6°C 1994 | 38% |
| May 31 | 17°C | 11°C | 24°C 2018 | 8°C 2005 | 40% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+2).
- May 1
- sunrise 6:05 AM, sunset 9:07 PM
- May 31
- sunrise 5:19 AM, sunset 9:54 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 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.