Weather on September 18
Olathe, KS
55 Years of Data
Avg High
80°F
Avg Low
59°F
Warmest
1983
83°F avg
Coldest
1973
51°F avg
About This Date
September 18th in Olathe, KS typically brings warm fall weather, with average highs around 80°F and lows near 59°F. Over 55 years of records, the warmest September 18th was in 1983 (83°F average), while the coldest was 1973 (51°F) — a 32°F range across recorded history. Rain or other precipitation has occurred on about 24% of September 18th dates historically, with the wettest September 18th recording 9.45" of rain. The last decade has been 4.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.2°F warmer on this date compared to 20-30 years ago.
Planning for September 18th in Olathe, KS? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 76° | 64° | 70° | 2.49" | — |
| 2024 | 87° | 65° | 76° | — | — |
| 2023 | 87° | 52° | 69° | — | — |
| 2022 | 96° | 69° | 83° | 0.15" | — |
| 2021 | 88° | 66° | 77° | — | — |
| 2020 | 73° | 53° | 63° | — | — |
| 2019 | 90° | 69° | 79° | — | — |
| 2018 | 91° | 69° | 80° | — | — |
| 2017 | 74° | 63° | 68° | 0.64" | — |
| 2016 | 82° | 59° | 71° | — | — |
| 2015 | 78° | 58° | 68° | 2.03" | — |
| 2014 | 69° | 60° | 65° | — | — |
| 2013 | 88° | 66° | 77° | — | — |
| 2012 | 68° | 47° | 57° | — | — |
| 2011 | 70° | 59° | 64° | 1.37" | — |
| 2010 | 89° | 65° | 77° | — | — |
| 2009 | 75° | 56° | 65° | — | — |
| 2008 | 80° | 55° | 68° | — | — |
| 2007 | 86° | 66° | 76° | — | — |
| 2006 | 65° | 50° | 57° | — | — |
| 2005 | 75° | 54° | 64° | 0.56" | — |
| 2004 | 74° | 56° | 65° | — | — |
| 2003 | 82° | 62° | 72° | — | — |
| 2002 | 82° | 66° | 74° | 0.76" | — |
| 2001 | 67° | 60° | 63° | — | — |
| 2000 | 91° | 61° | 76° | — | — |
| 1999 | 76° | 58° | 67° | — | — |
| 1998 | 83° | 65° | 74° | — | — |
| 1997 | 86° | 69° | 78° | — | — |
| 1996 | 68° | 54° | 61° | — | — |
| 1995 | 84° | 55° | 70° | — | — |
| 1994 | 80° | 53° | 67° | — | — |
| 1993 | 73° | 56° | 64° | — | — |
| 1992 | 78° | 63° | 70° | 1.91" | — |
| 1991 | 76° | 50° | 63° | 0.05" | — |
| 1990 | 77° | 60° | 69° | 1.14" | — |
| 1989 | 79° | 57° | 68° | — | — |
| 1988 | 79° | 70° | 74° | — | — |
| 1987 | 73° | 57° | 65° | — | — |
| 1986 | 82° | 63° | 72° | 9.45" | — |
| 1985 | 85° | 67° | 76° | — | — |
| 1984 | 77° | 48° | 63° | — | — |
| 1983warmest | 93° | 73° | 83° | — | — |
| 1982 | 68° | 48° | 58° | — | — |
| 1981 | 68° | 42° | 55° | — | — |
| 1980 | 86° | 49° | 67° | — | — |
| 1979 | 81° | 53° | 67° | — | — |
| 1978 | 89° | 68° | 79° | 1.78" | — |
| 1977 | 84° | 70° | 77° | — | — |
| 1976 | 90° | 59° | 74° | — | — |
| 1975 | 77° | 62° | 70° | — | — |
| 1974 | 85° | 58° | 71° | — | — |
| 1973coldest | 63° | 40° | 51° | — | — |
| 1972 | 94° | 71° | 82° | — | — |
| 1971 | 60° | 47° | 53° | 1.47" | — |
55 years of data from OLATHE 3E