July weather in St. Marys, PA
The average temperature in St. Marys in July is 66.8°F (55.0°F–78.5°F). Average precipitation: 4.67 inches.
July is a summer month in St. Marys, and is warmer than the annual average of 45.1°F. Daily temperatures swing about 23.5°F between overnight low and afternoon high. Expect about 12 days with precipitation. Daylight averages about 14h 43m. For travel, July is a comfortable month to visit.
Avg High
78.5°F
Avg Low
55.0°F
Precipitation
4.67 in
Daylight
14h 43m
July records in St. Marys
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| July 1 | 89.1°F (2012) | 39.9°F (2010) | 2.89 in (1974) |
| July 2 | 88.0°F (2018) | 41.0°F (2007) | 2.05 in (1999) |
| July 3 | 86.0°F (2018) | 41.0°F (2010) | 1.49 in (2006) |
| July 4 | 87.1°F (2020) | 46.0°F (2007) | 1.38 in (1992) |
| July 5 | 84.9°F (2010) | 39.9°F (2009) | 1.19 in (1943) |
| July 6 | 90.0°F (2010) | 44.1°F (2014) | 2.12 in (1953) |
| July 7 | 91.0°F (2012) | 46.0°F (2018) | 1.43 in (1994) |
| July 8 | 93.0°F (2012) | 44.1°F (2009) | 1.34 in (2020) |
| July 9 | 90.0°F (2010) | 46.0°F (2009) | 1.31 in (1956) |
| July 10 | 89.1°F (2007) | 46.0°F (2022) | 1.01 in (1944) |
| July 11 | 91.0°F (2024) | 48.9°F (2022) | 1.45 in (1976) |
| July 12 | 88.0°F (2011) | 46.0°F (2007) | 1.96 in (1990) |
| July 13 | 89.1°F (2005) | 46.9°F (2007) | 2.90 in (2004) |
| July 14 | 88.0°F (2024) | 43.0°F (2009) | 1.32 in (2017) |
| July 15 | 87.1°F (2024) | 44.1°F (2009) | 3.25 in (1974) |
| July 16 | 89.1°F (2013) | 44.1°F (2009) | 1.74 in (1992) |
| July 17 | 89.1°F (2006) | 45.0°F (2015) | 1.86 in (2020) |
| July 18 | 90.0°F (2012) | 45.0°F (2014) | 1.99 in (2021) |
| July 19 | 89.1°F (2011) | 45.0°F (2014) | 1.40 in (1969) |
| July 20 | 90.0°F (2011) | 46.9°F (2003) | 1.21 in (2007) |
| July 21 | 93.9°F (2011) | 46.9°F (2007) | 3.15 in (1967) |
| July 22 | 97.0°F (2011) | 46.0°F (2007) | 3.60 in (2003) |
| July 23 | 100.0°F (2011) | 46.9°F (2015) | 2.20 in (1945) |
| July 24 | 90.0°F (2022) | 46.0°F (2015) | 2.40 in (1979) |
| July 25 | 90.0°F (2022) | 45.0°F (2013) | 2.00 in (2022) |
| July 26 | 88.0°F (2016) | 44.1°F (2014) | 0.98 in (2011) |
| July 27 | 88.0°F (2005) | 46.9°F (2013) | 1.62 in (2004) |
| July 28 | 87.1°F (2020) | 51.1°F (2011) | 1.67 in (2013) |
| July 29 | 87.1°F (2023) | 48.9°F (2003) | 1.46 in (1963) |
| July 30 | 89.1°F (2024) | 46.9°F (2013) | 1.73 in (2009) |
| July 31 | 86.0°F (2011) | 48.9°F (2013) | 2.17 in (1962) |