Weather on September 21
Olathe, KS
55 Years of Data
Avg High
76°F
Avg Low
56°F
Warmest
1980
81°F avg
Coldest
1995
47°F avg
About This Date
September 21st in Olathe, KS typically brings pleasant fall weather, with average highs around 76°F and lows near 56°F. Over 55 years of records, the warmest September 21st was in 1980 (81°F average), while the coldest was 1995 (47°F) — a 34°F range across recorded history. Rain or other precipitation has occurred on about 29% of September 21st dates historically, with the wettest September 21st recording 3.94" of rain. The last decade has been 7.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 7.9°F warmer on this date compared to 20-30 years ago.
Planning for September 21st in Olathe, KS? Great weather for outdoor activities.
Warming Trend
1.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 80° | 62° | 71° | — | — |
| 2024 | 89° | 69° | 79° | 2.39" | — |
| 2023 | 86° | 61° | 73° | 2.54" | — |
| 2022 | 89° | 59° | 74° | 0.23" | — |
| 2021 | 75° | 58° | 66° | — | — |
| 2020 | 77° | 54° | 65° | — | — |
| 2019 | 76° | 70° | 73° | 1.96" | — |
| 2018 | 75° | 57° | 66° | 0.58" | — |
| 2017 | 89° | 73° | 81° | — | — |
| 2016 | 88° | 70° | 79° | — | — |
| 2015 | 73° | 58° | 65° | — | — |
| 2014 | 77° | 56° | 66° | — | — |
| 2013 | 74° | 50° | 62° | — | — |
| 2012 | 80° | 53° | 67° | — | — |
| 2011 | 71° | 51° | 61° | — | — |
| 2010 | 86° | 68° | 77° | — | — |
| 2009 | 67° | 58° | 62° | 2.95" | — |
| 2008 | 79° | 59° | 69° | — | — |
| 2007 | 88° | 66° | 77° | — | — |
| 2006 | 72° | 47° | 59° | — | — |
| 2005 | 87° | 66° | 77° | — | — |
| 2004 | 80° | 60° | 70° | — | — |
| 2003 | 71° | 50° | 61° | 0.05" | — |
| 2002 | 78° | 58° | 68° | — | — |
| 2001 | 77° | 59° | 68° | 0.18" | — |
| 2000 | 72° | 46° | 59° | — | — |
| 1999 | 63° | 39° | 51° | 0.05" | — |
| 1998 | 72° | 58° | 65° | 3.71" | — |
| 1997 | 76° | 54° | 65° | — | — |
| 1996 | 76° | 52° | 64° | — | — |
| 1995coldest | 54° | 40° | 47° | 0.23" | — |
| 1994 | 68° | 63° | 65° | — | — |
| 1993 | 83° | 54° | 68° | — | — |
| 1992 | 76° | 50° | 63° | 2.64" | — |
| 1991 | 62° | 48° | 55° | — | — |
| 1990 | 77° | 57° | 67° | — | — |
| 1989 | 78° | 55° | 67° | — | — |
| 1988 | 89° | 57° | 73° | — | — |
| 1987 | 76° | 48° | 62° | — | — |
| 1986 | 87° | 69° | 78° | — | — |
| 1985 | 64° | 50° | 57° | 1.19" | — |
| 1984 | 81° | 54° | 67° | — | — |
| 1983 | 62° | 36° | 49° | — | — |
| 1982 | 61° | 39° | 50° | — | — |
| 1981 | 81° | 60° | 70° | — | — |
| 1980warmest | 95° | 66° | 81° | — | — |
| 1979 | 74° | 53° | 63° | — | — |
| 1978 | 69° | 52° | 60° | 0.38" | — |
| 1977 | 79° | 62° | 70° | 0.74" | — |
| 1976 | 76° | 50° | 63° | — | — |
| 1975 | 65° | 43° | 54° | — | — |
| 1974 | 69° | 50° | 60° | — | — |
| 1973 | 86° | 62° | 74° | — | — |
| 1972 | 72° | 56° | 64° | 3.94" | — |
| 1971 | 73° | 43° | 58° | — | — |
55 years of data from OLATHE 3E