September weather in Rio Grande City, TX
The average temperature in Rio Grande City in September is 82.5°F (71.0°F–93.9°F). Average precipitation: 5.12 inches.
September is a fall month in Rio Grande City, and is warmer than the annual average of 74.4°F. Daily temperatures swing about 22.9°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 12h 9m. For travel, September is a wet month.
Avg High
93.9°F
Avg Low
71.0°F
Precipitation
5.12 in
Daylight
12h 9m
September records in Rio Grande City
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 107.1°F (1959) | 69.1°F (1972) | 2.53 in (2001) |
| September 2 | 106.0°F (1959) | 68.0°F (1973) | 4.62 in (1975) |
| September 3 | 108.0°F (2000) | 68.0°F (1973) | 4.92 in (1977) |
| September 4 | 108.0°F (2000) | 66.9°F (1903) | 1.50 in (2009) |
| September 5 | 109.9°F (2000) | 60.1°F (1974) | 3.49 in (1933) |
| September 6 | 111.0°F (2000) | 52.0°F (1974) | 5.50 in (1998) |
| September 7 | 105.1°F (1980) | 52.0°F (1974) | 4.30 in (1925) |
| September 8 | 104.0°F (1962) | 53.1°F (1974) | 3.00 in (1923) |
| September 9 | 105.1°F (1902) | 59.0°F (1953) | 2.75 in (2002) |
| September 10 | 105.1°F (2000) | 60.1°F (1953) | 3.20 in (1941) |
| September 11 | 107.1°F (2023) | 57.9°F (1942) | 3.80 in (1948) |
| September 12 | 105.1°F (1930) | 61.0°F (2017) | 2.97 in (1979) |
| September 13 | 105.1°F (1937) | 59.0°F (1960) | 3.76 in (1971) |
| September 14 | 107.1°F (1961) | 60.1°F (1902) | 4.22 in (1989) |
| September 15 | 105.1°F (1996) | 63.0°F (1940) | 3.65 in (1976) |
| September 16 | 106.0°F (2023) | 59.0°F (2008) | 1.66 in (1961) |
| September 17 | 104.0°F (1959) | 60.1°F (1979) | 2.25 in (1964) |
| September 18 | 102.9°F (1946) | 55.0°F (1981) | 1.56 in (2003) |
| September 19 | 102.9°F (2016) | 54.0°F (1981) | 2.15 in (1905) |
| September 20 | 102.9°F (1937) | 54.0°F (1981) | 2.42 in (1967) |
| September 21 | 106.0°F (1947) | 54.0°F (1942) | 4.00 in (1967) |
| September 22 | 107.1°F (1937) | 54.0°F (1983) | 12.51 in (1967) |
| September 23 | 102.9°F (1946) | 53.1°F (1975) | 4.96 in (1967) |
| September 24 | 104.0°F (2005) | 48.9°F (1975) | 2.30 in (1925) |
| September 25 | 106.0°F (2005) | 50.0°F (1975) | 1.97 in (1972) |
| September 26 | 102.9°F (1959) | 51.1°F (1991) | 1.60 in (1913) |
| September 27 | 105.1°F (1959) | 54.0°F (1940) | 6.30 in (2014) |
| September 28 | 105.1°F (2005) | 46.0°F (1942) | 3.10 in (1972) |
| September 29 | 102.9°F (1959) | 45.0°F (1942) | 1.28 in (1984) |
| September 30 | 102.9°F (1966) | 46.0°F (1967) | 2.85 in (1941) |