September weather in Grandfalls, TX
The average temperature in Grandfalls in September is 76.5°F (62.0°F–91.0°F). Average precipitation: 2.21 inches.
September is a fall month in Grandfalls, and is warmer than the annual average of 65°F. Daily temperatures swing about 29°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 12h 11m. For travel, September is hot.
Avg High
91.0°F
Avg Low
62.0°F
Precipitation
2.21 in
Daylight
12h 11m
September records in Grandfalls
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 105.1°F (1981) | 55.0°F (1955) | 3.50 in (1994) |
| September 2 | 102.9°F (1985) | 52.0°F (1955) | 0.75 in (1933) |
| September 3 | 102.9°F (1989) | 53.1°F (2010) | 1.20 in (1911) |
| September 4 | 104.0°F (1992) | 51.1°F (1984) | 5.87 in (1986) |
| September 5 | 104.0°F (2012) | 46.0°F (2011) | 1.25 in (1932) |
| September 6 | 105.1°F (1992) | 46.9°F (2011) | 2.00 in (1944) |
| September 7 | 105.1°F (1995) | 51.1°F (1943) | 1.42 in (1970) |
| September 8 | 100.9°F (1992) | 34.0°F (2012) | 0.60 in (1966) |
| September 9 | 106.0°F (1984) | 51.1°F (2012) | 3.00 in (1941) |
| September 10 | 107.1°F (1984) | 53.1°F (1988) | 3.10 in (1929) |
| September 11 | 102.9°F (1984) | 48.9°F (1940) | 1.80 in (1989) |
| September 12 | 102.9°F (2011) | 52.0°F (1940) | 2.20 in (1975) |
| September 13 | 102.0°F (1967) | 45.0°F (1945) | 3.00 in (1927) |
| September 14 | 100.9°F (1947) | 44.1°F (1945) | 0.40 in (1969) |
| September 15 | 102.0°F (1965) | 42.1°F (1993) | 2.00 in (1995) |
| September 16 | 102.0°F (1965) | 42.1°F (1993) | 1.00 in (1974) |
| September 17 | 102.0°F (1980) | 50.0°F (1994) | 0.71 in (1942) |
| September 18 | 102.9°F (1997) | 45.0°F (1981) | 1.98 in (1988) |
| September 19 | 100.0°F (1949) | 44.1°F (1991) | 2.27 in (1991) |
| September 20 | 104.0°F (1953) | 43.0°F (1971) | 1.75 in (1991) |
| September 21 | 102.9°F (1953) | 43.0°F (1971) | 0.70 in (1969) |
| September 22 | 102.0°F (1977) | 44.1°F (1995) | 3.15 in (1932) |
| September 23 | 100.9°F (1977) | 43.0°F (1975) | 1.90 in (1980) |
| September 24 | 100.0°F (1977) | 37.9°F (1989) | 4.34 in (1964) |
| September 25 | 104.0°F (2011) | 37.9°F (1989) | 0.98 in (1993) |
| September 26 | 102.9°F (1977) | 42.1°F (1984) | 1.55 in (1984) |
| September 27 | 106.0°F (1977) | 34.0°F (1942) | 1.68 in (1980) |
| September 28 | 105.1°F (1977) | 36.0°F (1996) | 3.58 in (2012) |
| September 29 | 99.0°F (1979) | 37.9°F (1942) | 1.70 in (1932) |
| September 30 | 106.0°F (1977) | 39.0°F (1942) | 0.50 in (1911) |