Weather on September 20
Olathe, KS
55 Years of Data
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.
| 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° | — | — |
Olathe, KS Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Olathe, KS Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Olathe, KS Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Olathe, KS
Olathe, KS has no months that meet our "pleasant" threshold — every season has tradeoffs.