Lenexa weather in September

In September, Lenexa sees average daytime highs of 78°F and overnight lows near 59°F, with 3.6 in of rain across 8.1 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 83°F in the first days to 74°F by the end. The sky is clear or mostly clear about 49% of the time in September, and the air most often feels dry.

Daylight stretches from about 12 h 54 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Lenexa's 1st-clearest and 10th-windiest month. For the whole year in context, see Lenexa's year-round climate.

Daytime high
78°
4th warmest
Overnight low
59°
9th coldest
Rainfall
3.6 in
8.1 wet days
Daylight
12 h 12 min
6:06 AM – 6:21 PM
Cloud cover
43%
1st clearest
Wind
7 mph
10th windiest
Solar energy
4.86 kWh/m²
Travel score
7.1
out of 10

Lenexa is city in Johnson County, Kansas, United States.

Density
588/km²
people per km²
Founded
1869

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 83°F in the first days to 74°F by the end.

A typical September day in Lenexa reaches about 78°F in the afternoon and slips back to 59°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 68°F and 88°F. Set against its neighbours, September runs about 8°F cooler than August and about 12°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
18465
28365
38364
48364
58264
68263
78263
88162
98162
108062
118061
128061
137960
147960
157860
167859
177859
187758
197758
207757
217657
227657
237656
247556
257555
267555
277455
287454
297454
307353

How September really feels in Lenexa

Once humidity and wind are folded in, September averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
0
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Lenexa weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan39° / 22°1.45.63.49.60.0
Feb44° / 26°1.85.92.810.50.7
Mar55° / 36°3.09.11.911.73.5
Apr65° / 46°4.711.10.3135.7
May74° / 56°5.712.70.114.16.3
Jun83° / 66°4.811.3014.75.6
Jul88° / 70°3.69.4014.54.7
Aug86° / 68°3.79013.55.2
Sep78° / 59°3.68.1012.37.1
Oct66° / 47°3.380.2116.6
Nov53° / 36°2.36.40.99.93.4
Dec42° / 26°1.85.62.59.30.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 49% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 36%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16634
26535
36634
46634
56535
66535
76436
86436
96337
106337
116337
126238
136139
146139
156139
166139
176040
186139
196238
206238
216337
226436
236535
246634
256733
266832
276832
286832
296832
306832

Chance of precipitation in September

Any precipitation

Lenexa gets around 3.6 in of rain over 8.1 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 28% and peaks near 30% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
129
229
329
429
529
629
728
828
929
1029
1129
1229
1329
1429
1529
1630
1729
1829
1929
2029
2128
2227
2327
2426
2526
2626
2725
2825
2925
3025

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the dry band about 37% of days. Sticky, muggy-or-worse air turns up on roughly 25% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
11016244010
2111625389
3131725369
4151825348
5171925327
6191925307
7202024296
8222124276
9242123265
10262223255
11282222245
12292221234
13312220224
14332220224
15352219213
16372218203
17382118203
18402117192
19432116182
20452016172
21471915162
22491915152
23511815142
24551714131
25561714121
26581614111
27601613101
2862151391
2964151380
3065151280

Wind in September

Winds average 7 mph in September.

Across September, daily wind ranges from about 7 mph on the calmest days to 8 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277light breeze
287light breeze
298light breeze
308light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 54 min at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 78 minutes over September. Sunrise moves from 5:52 AM to 6:19 AM, and sunset from 6:45 PM to 5:58 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:526:45
212.85:536:44
312.85:546:42
412.85:556:41
512.75:566:39
612.75:576:37
712.65:576:36
812.65:586:34
912.65:596:32
1012.56:006:31
1112.56:016:29
1212.46:026:27
1312.46:036:26
1412.36:046:24
1512.36:056:22
1612.26:066:21
1712.26:076:19
1812.26:086:17
1912.16:096:16
2012.16:096:14
2112.06:106:12
2212.06:116:11
2311.96:126:09
2411.96:136:07
2511.96:146:06
2611.86:156:04
2711.86:166:02
2811.76:176:01
2911.76:185:59
3011.66:195:58

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.86 kWh/m².

For context, solar energy here swings from a low near 2.05 kWh/m² to a high of 6.56 kWh/m² in July across the year — September's 4.86 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.4Bright
25.4Bright
35.3Bright
45.3Bright
55.3Bright
65.2Bright
75.2Bright
85.1Bright
95.1Bright
105.0Bright
115.0Bright
124.9Bright
134.9Bright
144.8Bright
154.8Bright
164.8Bright
174.7Bright
184.7Bright
194.7Bright
204.6Bright
214.6Bright
224.6Bright
234.5Bright
244.5Bright
254.5Bright
264.5Bright
274.4Bright
284.4Bright
294.3Bright
304.3Bright
Planning a trip in September

Is September a good time to visit Lenexa?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

7.1
Sightseeing
1st-best month of the year
6.7
Beach & pool
3rd-best month of the year

September is one of the better times to visit Lenexa for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Lenexa in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Lenexa sees daytime highs around 78°F and nights near 59°F. Worth packing: light clothes, rain gear and sun protection. About 8 days see rain.

light clothesrain gearsun protection

UV index in Lenexa in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Lenexa peaks around June 22 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJun 22UV 10Jan 1UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr7High
May7High
Jun10Very high
Jul10Very high
Aug9Very high
Sep7High
Oct5Moderate
Nov3Moderate
Dec2Low

Air quality in Lenexa in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Lenexa is worst in July — around 16 µg/m³ PM2.5 (moderate), about 2.4× the cleanest month (October, 7 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1716 µg/m³Oct 237 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb12Good
Mar12Good
Apr11Good
May12Good
Jun14Moderate
Jul16Moderate
Aug14Moderate
Sep11Good
Oct7Good
Nov7Good
Dec8Good
Location & terrain

Where is Lenexa?

Lenexa sits at 39.0°N, 94.7°W, 1,030 ft above sea level, in United States. The nearest listed city is Overland Park, 3.7 mi away.

Topography around Lenexa

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Lenexa.

Within 2 miles, the terrain around Lenexa has only modest variations in elevation — a maximum elevation change of 184 ft around an average of 1,024 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 394 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 545 ft.

The land around Lenexa is covered by trees (46%) and artificial surfaces (42%) within 2 miles, trees (56%) and artificial surfaces (21%) within 10 miles, and trees (34%), grassland (33%) and cropland (29%) within 50 miles.

2 miles
184 ft
10 miles
394 ft
50 miles
545 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Overland Park 3.7 mi · Prairie Village 6.2 mi · Shawnee 6.2 mi · Leawood 6.2 mi · Olathe 6.8 mi · Grandview 12 mi · Kansas City 12 mi · Kansas City 13 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Lenexa (38.9536°, -94.7336°, elevation 1,030 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).