May weather in Portland, TX
The average temperature in Portland in May is 78.2°F (70.6°F–85.7°F). Average precipitation: 3.25 inches.
May is a spring month in Portland, and is warmer than the annual average of 72°F. Daily temperatures swing about 15.1°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 13h 23m. For travel, May is a comfortable month to visit.
Avg High
85.7°F
Avg Low
70.6°F
Precipitation
3.25 in
Daylight
13h 23m
May records in Portland
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 96.1°F (2010) | 54.0°F (2005) | 1.53 in (2021) |
| May 2 | 91.0°F (2010) | 57.9°F (2015) | 0.52 in (2021) |
| May 3 | 89.1°F (2021) | 48.0°F (2013) | 0.13 in (2025) |
| May 4 | 97.0°F (2009) | 48.9°F (2013) | 1.11 in (2019) |
| May 5 | 91.9°F (2006) | 48.9°F (2013) | 0.07 in (2018) |
| May 6 | 91.0°F (2022) | 54.0°F (2013) | 0.10 in (2008) |
| May 7 | 95.0°F (2022) | 57.9°F (2013) | 0.51 in (2019) |
| May 8 | 90.0°F (2006) | 61.0°F (2013) | 1.15 in (2005) |
| May 9 | 95.0°F (2020) | 62.1°F (2018) | 0.54 in (2020) |
| May 10 | 100.0°F (2006) | 62.1°F (2020) | 2.61 in (2014) |
| May 11 | 91.0°F (2008) | 63.0°F (2025) | 2.66 in (2012) |
| May 12 | 93.9°F (2025) | 61.0°F (2006) | 4.45 in (2015) |
| May 13 | 95.0°F (2024) | 61.0°F (2013) | 1.74 in (2011) |
| May 14 | 93.9°F (2024) | 57.9°F (2014) | 0.67 in (2015) |
| May 15 | 91.9°F (2025) | 53.1°F (2014) | 0.15 in (2023) |
| May 16 | 93.0°F (2008) | 53.1°F (2014) | 5.31 in (2016) |
| May 17 | 91.0°F (2006) | 54.0°F (2014) | 0.82 in (2021) |
| May 18 | 95.0°F (2006) | 62.1°F (2008) | 0.60 in (2021) |
| May 19 | 93.9°F (2006) | 60.1°F (2009) | 0.27 in (2021) |
| May 20 | 95.0°F (2008) | 63.0°F (2009) | 4.50 in (2021) |
| May 21 | 91.9°F (2011) | 62.1°F (2009) | 0.73 in (2018) |
| May 22 | 91.9°F (2005) | 66.9°F (2012) | 3.96 in (2015) |
| May 23 | 93.0°F (2024) | 66.9°F (2012) | 0.11 in (2022) |
| May 24 | 93.0°F (2024) | 57.9°F (2017) | 0.78 in (2015) |
| May 25 | 93.0°F (2009) | 59.0°F (2017) | 1.11 in (2020) |
| May 26 | 96.1°F (2009) | 64.0°F (2017) | 1.31 in (2007) |
| May 27 | 95.0°F (2022) | 66.0°F (2007) | 0.40 in (2025) |
| May 28 | 96.1°F (2024) | 66.9°F (2005) | 0.40 in (2009) |
| May 29 | 93.9°F (2020) | 66.0°F (2015) | 2.25 in (2017) |
| May 30 | 93.9°F (2010) | 66.9°F (2015) | 0.19 in (2015) |
| May 31 | 93.0°F (2005) | 69.1°F (2014) | 3.06 in (2006) |