September weather in Sinai, SD
The average temperature in Sinai in September is 61.4°F (50.0°F–72.9°F). Average precipitation: 2.55 inches.
September is a fall month in Sinai, and is warmer than the annual average of 44.7°F. Daily temperatures swing about 22.9°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 17m. For travel, September is one of the best months of the year to visit.
Avg High
72.9°F
Avg Low
50.0°F
Precipitation
2.55 in
Daylight
12h 17m
September records in Sinai
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 89.1°F (2011) | 46.0°F (1994) | 0.77 in (1966) |
| September 2 | 87.1°F (2001) | 46.0°F (2005) | 3.12 in (2006) |
| September 3 | 91.0°F (2005) | 37.9°F (2008) | 0.75 in (1962) |
| September 4 | 90.0°F (2001) | 41.0°F (2003) | 3.28 in (1999) |
| September 5 | 90.0°F (1998) | 43.0°F (1993) | 2.41 in (1985) |
| September 6 | 91.9°F (2002) | 44.1°F (1993) | 1.59 in (1948) |
| September 7 | 90.0°F (2002) | 39.9°F (2004) | 1.41 in (1946) |
| September 8 | 89.1°F (2002) | 35.1°F (1995) | 1.49 in (2005) |
| September 9 | 91.0°F (2000) | 37.0°F (1995) | 1.31 in (1946) |
| September 10 | 90.0°F (1998) | 41.0°F (1999) | 1.00 in (1947) |
| September 11 | 90.0°F (1998) | 45.0°F (2007) | 2.28 in (1932) |
| September 12 | 88.0°F (1998) | 37.9°F (2007) | 1.57 in (1972) |
| September 13 | 87.1°F (1998) | 39.9°F (1996) | 0.99 in (2005) |
| September 14 | 86.0°F (1994) | 34.0°F (2007) | 2.04 in (1941) |
| September 15 | 84.0°F (1995) | 30.9°F (2011) | 1.20 in (1983) |
| September 16 | 90.0°F (2000) | 30.9°F (2011) | 2.42 in (1954) |
| September 17 | 84.9°F (1998) | 34.0°F (2011) | 4.22 in (1986) |
| September 18 | 90.0°F (1998) | 37.0°F (2010) | 0.91 in (1978) |
| September 19 | 87.1°F (2004) | 33.1°F (2003) | 1.63 in (1957) |
| September 20 | 87.1°F (2007) | 28.9°F (2006) | 1.43 in (1993) |
| September 21 | 90.0°F (2005) | 33.1°F (1995) | 1.47 in (1950) |
| September 22 | 80.1°F (1999) | 26.1°F (1995) | 1.04 in (1969) |
| September 23 | 88.0°F (2007) | 32.0°F (1993) | 1.30 in (2004) |
| September 24 | 82.9°F (2007) | 28.0°F (2000) | 2.36 in (1934) |
| September 25 | 82.9°F (1997) | 28.9°F (2003) | 2.32 in (1929) |
| September 26 | 87.1°F (2008) | 32.0°F (1994) | 0.72 in (1996) |
| September 27 | 84.0°F (2008) | 30.9°F (1993) | 0.59 in (1965) |
| September 28 | 90.0°F (2011) | 25.0°F (1992) | 0.82 in (1968) |
| September 29 | 84.9°F (2000) | 30.0°F (2003) | 1.17 in (1982) |
| September 30 | 87.1°F (1992) | 27.0°F (2003) | 3.31 in (1995) |