Weather on September 20
Olathe, KS
55 Years of Data
Avg High
78°F
Avg Low
58°F
Warmest
1980
85°F avg
Coldest
1991
50°F avg
About This Date
September 20th in Olathe, KS typically brings pleasant fall weather, with average highs around 78°F and lows near 58°F. Over 55 years of records, the warmest September 20th was in 1980 (85°F average), while the coldest was 1991 (50°F) — a 35°F range across recorded history. Rain or other precipitation has occurred on about 25% of September 20th dates historically, with the wettest September 20th recording 5.84" of rain. The last decade has been 10.4°F warmer on this date compared to 20-30 years ago.
The last decade has been 10.4°F warmer on this date compared to 20-30 years ago.
Planning for September 20th in Olathe, KS? Great weather for outdoor activities.
Warming Trend
1.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 80° | 63° | 71° | — | — |
| 2024 | 93° | 68° | 81° | — | — |
| 2023 | 84° | 63° | 73° | — | — |
| 2022 | 97° | 71° | 84° | — | — |
| 2021 | 87° | 63° | 75° | 0.84" | — |
| 2020 | 74° | 50° | 62° | — | — |
| 2019 | 82° | 69° | 76° | 0.03" | — |
| 2018 | 91° | 72° | 81° | — | — |
| 2017 | 86° | 72° | 79° | — | — |
| 2016 | 89° | 70° | 79° | — | — |
| 2015 | 73° | 52° | 62° | — | — |
| 2014 | 83° | 66° | 74° | — | — |
| 2013 | 70° | 55° | 62° | — | — |
| 2012 | 76° | 55° | 65° | — | — |
| 2011 | 81° | 54° | 67° | — | — |
| 2010 | 89° | 69° | 79° | 0.03" | — |
| 2009 | 77° | 63° | 70° | — | — |
| 2008 | 77° | 59° | 68° | — | — |
| 2007 | 87° | 68° | 78° | 0.23" | — |
| 2006 | 67° | 46° | 56° | — | — |
| 2005 | 89° | 67° | 78° | — | — |
| 2004 | 85° | 61° | 73° | — | — |
| 2003 | 66° | 44° | 55° | — | — |
| 2002 | 66° | 58° | 62° | 0.2" | — |
| 2001 | 82° | 59° | 71° | — | — |
| 2000 | 69° | 53° | 61° | — | — |
| 1999 | 67° | 52° | 59° | 0.13" | — |
| 1998 | 84° | 67° | 75° | — | — |
| 1997 | 79° | 52° | 65° | — | — |
| 1996 | 67° | 50° | 58° | 1.45" | — |
| 1995 | 60° | 51° | 56° | 0.28" | — |
| 1994 | 83° | 61° | 72° | — | — |
| 1993 | 77° | 58° | 67° | 5.84" | — |
| 1992 | 76° | 58° | 67° | 0.76" | — |
| 1991coldest | 63° | 38° | 50° | — | — |
| 1990 | 77° | 57° | 67° | — | — |
| 1989 | 78° | 54° | 66° | — | — |
| 1988 | 80° | 50° | 65° | 0.18" | — |
| 1987 | 76° | 51° | 63° | — | — |
| 1986 | 87° | 69° | 78° | — | — |
| 1985 | 76° | 57° | 66° | — | — |
| 1984 | 85° | 58° | 71° | — | — |
| 1983 | 77° | 42° | 60° | 1.93" | — |
| 1982 | 69° | 45° | 57° | — | — |
| 1981 | 82° | 54° | 68° | — | — |
| 1980warmest | 93° | 77° | 85° | — | — |
| 1979 | 78° | 57° | 68° | — | — |
| 1978 | 84° | 55° | 70° | — | — |
| 1977 | 71° | 52° | 61° | — | — |
| 1976 | 73° | 61° | 67° | 0.1" | — |
| 1975 | 68° | 46° | 57° | 0.13" | — |
| 1974 | 73° | 57° | 65° | — | — |
| 1973 | 70° | 61° | 65° | — | — |
| 1972 | 85° | 67° | 76° | — | — |
| 1971 | 71° | 41° | 56° | — | — |
55 years of data from OLATHE 3E