September weather in Harpers Ferry, IA
The average temperature in Harpers Ferry in September is 63.3°F (53.3°F–73.3°F). Average precipitation: 3.79 inches.
September is a fall month in Harpers Ferry, and is warmer than the annual average of 47.4°F. Daily temperatures swing about 20°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 12h 17m. For travel, September is one of the best months of the year to visit.
Avg High
73.3°F
Avg Low
53.3°F
Precipitation
3.79 in
Daylight
12h 17m
September records in Harpers Ferry
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 95.0°F (1953) | 44.1°F (1949) | 4.10 in (2010) |
| September 2 | 93.9°F (1953) | 46.0°F (1946) | 1.36 in (1961) |
| September 3 | 95.0°F (1947) | 41.0°F (1974) | 1.57 in (2019) |
| September 4 | 98.1°F (1939) | 41.0°F (1974) | 4.40 in (2018) |
| September 5 | 93.0°F (1945) | 43.0°F (1962) | 1.95 in (2018) |
| September 6 | 93.9°F (1978) | 43.0°F (1988) | 2.19 in (1946) |
| September 7 | 95.0°F (1939) | 39.0°F (1956) | 2.25 in (1965) |
| September 8 | 100.0°F (1939) | 43.0°F (1995) | 1.92 in (2016) |
| September 9 | 96.1°F (1945) | 45.0°F (1969) | 1.08 in (1991) |
| September 10 | 91.9°F (2013) | 41.0°F (1967) | 1.45 in (2016) |
| September 11 | 89.1°F (1948) | 37.9°F (1955) | 1.38 in (2006) |
| September 12 | 91.9°F (1984) | 37.0°F (1955) | 2.84 in (1991) |
| September 13 | 91.9°F (1939) | 33.1°F (1963) | 3.20 in (2019) |
| September 14 | 93.9°F (1939) | 39.9°F (1974) | 1.54 in (1938) |
| September 15 | 96.1°F (1939) | 37.0°F (2007) | 1.51 in (1970) |
| September 16 | 97.0°F (1939) | 39.0°F (1959) | 1.55 in (2016) |
| September 17 | 91.9°F (1955) | 39.0°F (1959) | 1.62 in (1965) |
| September 18 | 91.9°F (1955) | 39.9°F (1959) | 1.52 in (1942) |
| September 19 | 91.0°F (1948) | 37.9°F (1991) | 2.37 in (1942) |
| September 20 | 87.1°F (1940) | 32.0°F (1956) | 2.85 in (1988) |
| September 21 | 91.0°F (2022) | 37.9°F (1982) | 1.75 in (1986) |
| September 22 | 90.0°F (2017) | 30.9°F (1974) | 3.34 in (2016) |
| September 23 | 91.0°F (2017) | 33.1°F (1974) | 2.84 in (1946) |
| September 24 | 88.0°F (1984) | 32.0°F (1976) | 1.47 in (1977) |
| September 25 | 86.0°F (1986) | 32.0°F (1942) | 1.54 in (2020) |
| September 26 | 87.1°F (1986) | 30.0°F (1984) | 1.38 in (1994) |
| September 27 | 84.0°F (1963) | 34.0°F (1957) | 1.60 in (1959) |
| September 28 | 84.9°F (1952) | 30.0°F (1942) | 0.82 in (1944) |
| September 29 | 90.0°F (1939) | 30.0°F (1984) | 1.08 in (1939) |
| September 30 | 86.0°F (1971) | 28.9°F (1984) | 3.40 in (1961) |