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Olathe, KS Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Olathe, KS?
Olathe, KS gets 37.7 in of precipitation a year over about 100 rainy days. July is the warmest month (average high 88°F) and January the coldest (average low 22°F).
Humid continental climate
Olathe, KS has hot summers and chilly winters. Daytime highs range from about 40°F in January to 88°F in July. May is usually the wettest month. The most comfortable time to visit is typically April and September to October, when daytime highs sit near 71°F.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | 24° | 42° |
| Spring | Mar–May | 45° | 65° |
| Summer | Jun–Aug | 67° | 86° |
| Autumn | Sep–Nov | 47° | 67° |
How much rain does Olathe get?
Olathe gets 37.7 in of precipitation in an average year, spread over about 100 days with measurable rain. That is more rainy days than 60% of the US.
May is the wettest month, with 5.4 in. January is the driest, with 1.1 in. May has the most rainy days, about 12.
The longest dry spell in the last five years lasted 37 days, to January 7, 2026.
From September 2025 to August 2026 Olathe got 34.5 in of rain, against a normal of 37.7 in for those months. April 2026 had the most, with 6.4 in.
See where Olathe ranks: rainiest cities in the US, US cities with the most rainy days, rainiest cities in Kansas.
Olathe weather by month
Olathe weather in January
In January, Olathe averages a high of 40°F and a low of 22°F. It gets 1.1 in of precipitation over about 5 rainy days. Estimated sunshine is 39% of daylight hours, derived from ERA5 cloud cover. The January record high is 74°F (2015) and the record low is -10°F (1997).
Olathe weather in February
In February, Olathe averages a high of 44°F and a low of 25°F. It gets 1.4 in of precipitation over about 6 rainy days. Estimated sunshine is 51% of daylight hours, derived from ERA5 cloud cover. The February record high is 79°F (2017) and the record low is -13°F (2021).
Olathe weather in March
In March, Olathe averages a high of 56°F and a low of 35°F. It gets 2.3 in of precipitation over about 9 rainy days. Estimated sunshine is 44% of daylight hours, derived from ERA5 cloud cover. The March record high is 92°F (2026) and the record low is -3°F (2014).
Olathe weather in April
In April, Olathe averages a high of 66°F and a low of 45°F. It gets 3.9 in of precipitation over about 11 rainy days. Estimated sunshine is 51% of daylight hours, derived from ERA5 cloud cover. The April record high is 92°F (2012) and the record low is 17°F (2018). April is one of the most comfortable months to visit.
Olathe weather in May
In May, Olathe averages a high of 74°F and a low of 55°F. It gets 5.4 in of precipitation over about 12 rainy days. Estimated sunshine is 39% of daylight hours, derived from ERA5 cloud cover. The May record high is 94°F (1998) and the record low is 32°F (2013).
Olathe weather in June
In June, Olathe averages a high of 84°F and a low of 65°F. It gets 5.2 in of precipitation over about 11 rainy days. Estimated sunshine is 51% of daylight hours, derived from ERA5 cloud cover. The June record high is 103°F (2012) and the record low is 46°F (2001).
Olathe weather in July
In July, Olathe averages a high of 88°F and a low of 69°F. It gets 4.2 in of precipitation over about 9 rainy days. Estimated sunshine is 50% of daylight hours, derived from ERA5 cloud cover. The July record high is 107°F (2012) and the record low is 51°F (1997).
Olathe weather in August
In August, Olathe averages a high of 87°F and a low of 67°F. It gets 4.4 in of precipitation over about 9 rainy days. Estimated sunshine is 60% of daylight hours, derived from ERA5 cloud cover. The August record high is 110°F (2011) and the record low is 51°F (2015).
Olathe weather in September
In September, Olathe averages a high of 79°F and a low of 59°F. It gets 3.5 in of precipitation over about 8 rainy days. Estimated sunshine is 67% of daylight hours, derived from ERA5 cloud cover. The September record high is 105°F (2000) and the record low is 38°F (2014). September is one of the most comfortable months to visit.
Olathe weather in October
In October, Olathe averages a high of 67°F and a low of 47°F. It gets 3.0 in of precipitation over about 9 rainy days. Estimated sunshine is 62% of daylight hours, derived from ERA5 cloud cover. The October record high is 93°F (2006) and the record low is 23°F (2019). October is one of the most comfortable months to visit.
Olathe weather in November
In November, Olathe averages a high of 54°F and a low of 35°F. It gets 2.0 in of precipitation over about 6 rainy days. Estimated sunshine is 57% of daylight hours, derived from ERA5 cloud cover. The November record high is 81°F (2006) and the record low is 7°F (2019).
Olathe weather in December
In December, Olathe averages a high of 43°F and a low of 25°F. It gets 1.4 in of precipitation over about 5 rainy days. Estimated sunshine is 47% of daylight hours, derived from ERA5 cloud cover. The December record high is 74°F (2021) and the record low is -8°F (2016).
Sunshine, humidity and wind in Olathe
September is the sunniest month in Olathe, with estimated sunshine of 67% of daylight hours from ERA5 cloud cover. January is the cloudiest, at 39%. The annual cloud-cover estimate is 52% of daylight hours; it is not a measurement of sunshine duration. Olathe is sunnier than 66% of the US.
Humidity peaks in January at 70% and is lowest in April at 56%.
Wind averages 9 mph over the year, and April is the windiest month at 11 mph.
Olathe has about 34 days a year above 90°F. Olathe is hotter than 56% of the US.
Thunderstorms occur on about 55 days a year.
See where Olathe ranks: sunniest cities in the US, cloudiest cities in the US, hottest cities in the US.
First and last freeze in Olathe
The first fall freeze in Olathe typically comes around October 27, and the last spring freeze around April 8. That leaves a frost-free growing season of about 202 days.
Olathe weather records
These records cover OLATHE JOHNSON CO EXECUTIVE AP during 1996–2026. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Olathe station is 110°F, on August 2, 2011. The coldest is -13°F, on February 16, 2021.
The wettest day in the available station history brought 4.6 in of precipitation, on September 13, 1998.
38 all-time records have been set at the station since 1996.
The best time to visit Olathe
The most comfortable time to visit is typically April and September to October, when daytime highs sit near 71°F.
Winter (December–February) is chilly, with average highs around 42°F and lows near 24°F.
Spring (March–May) is mild, with average highs around 65°F and lows near 45°F.
Summer (June–August) is hot, with average highs around 86°F and lows near 67°F.
Autumn (September–November) is mild, with average highs around 67°F and lows near 47°F.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Wind | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|---|
| January | 22° | 40° | 1.1 in | 5 | 9 mph | 70% | 39% | 74° | -10° |
| February | 25° | 44° | 1.4 in | 6 | 10 mph | 62% | 51% | 79° | -13° |
| March | 35° | 56° | 2.3 in | 9 | 10 mph | 61% | 44% | 92° | -3° |
| April | 45° | 66° | 3.9 in | 11 | 11 mph | 56% | 51% | 92° | 17° |
| May | 55° | 74° | 5.4 in | 12 | 9 mph | 67% | 39% | 94° | 32° |
| June | 65° | 84° | 5.2 in | 11 | 8 mph | 65% | 51% | 103° | 46° |
| July | 69° | 88° | 4.2 in | 9 | 7 mph | 69% | 50% | 107° | 51° |
| August | 67° | 87° | 4.4 in | 9 | 7 mph | 69% | 60% | 110° | 51° |
| September | 59° | 79° | 3.5 in | 8 | 8 mph | 64% | 67% | 105° | 38° |
| October | 47° | 67° | 3.0 in | 9 | 8 mph | 60% | 62% | 93° | 23° |
| November | 35° | 54° | 2.0 in | 6 | 9 mph | 64% | 57% | 81° | 7° |
| December | 25° | 43° | 1.4 in | 5 | 9 mph | 68% | 47% | 74° | -8° |
Station: OLATHE JOHNSON CO EXECUTIVE AP, 8 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 1996–2026; record values refer to this station and period, not the entire city’s history. Precipitation includes rain and the water equivalent of frozen precipitation; snowfall depth is shown separately when available. Sources and methods
From ERA5 reanalysis. Sunshine is estimated from cloud cover.
Olathe climate questions
How much rain does Olathe get?
Olathe gets 37.7 in of precipitation in an average year, over about 100 rainy days.
What is the wettest month in Olathe?
May is the wettest month in Olathe, with 5.4 in. January is the driest, with 1.1 in.
How many rainy days does Olathe have a year?
Olathe has about 100 days with measurable rain in an average year. May has the most, about 12.
What is the hottest month in Olathe?
July is the warmest month in Olathe, with an average high of 88°F.
What is the coldest month in Olathe?
January is the coldest month in Olathe, with an average low of 22°F.
What is the record high temperature in Olathe?
Within the available 1996–2026 station history, the record high at the Olathe station is 110°F, set on August 2, 2011. The record low is -13°F, on February 16, 2021.
What is the sunniest month in Olathe?
September is the sunniest month in Olathe, with estimated sunshine of 67% of daylight hours from ERA5 cloud cover. January is the cloudiest.
When is the first frost in Olathe?
The first fall freeze in Olathe typically comes around October 27. The last spring freeze is around April 8.
What is the best time to visit Olathe?
The most comfortable time to visit is typically April and September to October, when daytime highs sit near 71°F.