Olathe, KS weather in September
Expect mild weather with some rain in Olathe in September, with highs near 78°F and lows near 59°F. Rain falls on about 8 days. Good for outdoor plans.
- Normal high
- 78°F
- Normal low
- 59°F
- Wet days
- 8
- 4.3 in total
- Muggy days
- 8
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 83°F | 73°F |
| Normal low | 64°F | 53°F |
| Chance of a wet day | 25% | 24% |
| Sunrise / sunset | 6:48 am / 7:50 pm | 7:14 am / 7:04 pm |
| Daylight | 13.0 h | 11.8 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Central Time).
A typical September day
- 6 am63°Fdew point 57°F
- 9 am70°Fdew point 58°F
- Noon76°Fdew point 58°F
- 3 pm79°Fdew point 58°F
- 6 pm76°Fdew point 57°F
- 9 pm70°Fdew point 58°F
NOAA hourly normals (local standard time) from Kansas City Downtown Airport (20 mi away); average wind 8 mph; clear or few clouds in 72% of daytime hours, mostly cloudy or overcast in 23%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F12 of 30
- Hot dayshigh 90°F or more3 of 30
- Muggy daysdaily mean dew point 65°F or more8 of 30
- Wet daysat least 0.01 in of rain or melted snow8 of 30
- Notable rainat least 0.10 in6 of 30
- Freezing nightslow 32°F or below0 of 30
- Snow on the groundsnow depth 1 in or more0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 4.3 in; a dry September brings about 2.5 in and a wet one about 5.2 in (25th and 75th percentiles). About 3 days bring half an inch or more, and about 1 an inch or more.
How September varies from year to year
- Warmest September, 1991-20202002: average high 84°F
- Coolest September1996: average high 75°F
- Wettest September1993: 10.8 in
- Driest September2011: 0.8 in
- Highest reading105°F (September 2, 2000)
- Lowest reading38°F (September 13, 2014)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 87°F | 78°F | 67°F |
| Normal low | 67°F | 59°F | 47°F |
| Wet days | 8 | 8 | 7 |
| Comfortable days | 2 | 12 | 14 |
| Daylight | 13.6 h | 12.4 h | 11.2 h |
Highs change by -9°F from August and -11°F into October.
Nearby alternatives in September
- Warmer: Wichita, KS159 mi · high 83°F · 7 wet days
How Olathe ranks in September
- Normal high221st warmest of 378 cities; 3rd of 3 in Kansas
- Wet days179th driest of 378
- Comfortable days137th most of 342
Heating and cooling
September has 51 heating degree days and 152 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is Olathe in September?
The normal high is 78°F and the normal low is 59°F. From 1991 to 2020 the hottest September reading was 105°F (September 2, 2000).
Does it rain a lot in Olathe in September?
About 8 days in September have at least 0.01 in of precipitation, and the normal total is 4.3 in. The wettest September in 1991-2020 was in 1993 (10.8 in); the driest was in 2011 (0.8 in).
Is September a good time to visit Olathe?
September ranks 4th of 12 months on our comfort score for Olathe (62 out of 100). It has about 12 comfortable days and about 3 days at 90°F or hotter. The best months are April and May.
Where the numbers come from
- Temperature and frost dates: Olathe Johnson Co Exec Airport (USW00003967), 4.8 mi ESE of the city center, 1,070 ft . NOAA normals and daily records, 1991-2020.
- Rain, snowfall and snow depth: Bonner Springs (USC00140957), 13 mi NNW of the city center, 850 ft (185 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: Kansas City Downtown Airport (USW00013988), 20 mi NE of the city center, 742 ft (293 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: New Century Aircenter Arpt (724475-93909), 5.6 mi SW of the city center, 1,055 ft . Hourly observations, 1991-2020.