United States Kansas City Weather in September — Climate Guide
September in Kansas City is very-high
September is very-high for Kansas City.
September is genuinely Kansas City's year-second sweet spot alongside May — humidity finally breaking mid-month + 26°C / 79°F pleasant walking weather + Chiefs NFL regular season opener mid-month (MASSIVE city celebration) + Kansas Speedway NASCAR Cup Series race weekend mid-September + atmospheric Plaza Art Fair late month.
The canonical 'late summer + autumn transition + Chiefs football return + Mosel-no-wait — Royals stretch run' window. Chiefs NFL regular season opener weekend mid-September drives MASSIVE hotel surge +50-80% across downtown — book 6-8 weeks ahead. Kansas Speedway race weekend mid-September another +40-60% surge.
Travel score
Year's underrated sweet spot — Chiefs opener + Kansas Speedway + humidity breaks + atmospheric warmth
September Weather at a Glance
September averages 79°F / 26°C highs and 59°F / 15°C lows with 8 rainy days and 95mm of rain. Humidity 70%, UV 7, sunshine 8 hours. Late summer transitioning to early autumn + humidity finally breaks mid-month.
September Travel Advice
Book Chiefs season opener + Kansas Speedway weekends 6-8 weeks ahead (+50-80% hotel surge). Late September (after Chiefs opener + Speedway overlap settles) is the underrated value window with same atmospheric weather.
September Pricing Trends
Very high pricing with Chiefs opener + Kansas Speedway surge: 3-star $170-260/night, 4-star $250-380, 5-star $380-580. Chiefs season opener weekend + Kansas Speedway race weekend +50-80%.
Kansas City September Weather Stats
Avg High
26°C
Avg Low
15°C
Rainy Days
8
95mm total
Sunshine
8h
Daily avg
Humidity
70%
comfortable
UV Index
7
High
Wind
10 km/h
Gusts 22
Sea Temp
22°C
hotel pools
Crowds
Very busy
At attractions
September Sunrise & Sunset
Air Quality
PM2.5
17 μg/m³
PM10
30 μg/m³
Status
good
Feels-Like Temperature & Wind
Feels like
Daytime
26°C
Nighttime
14°C
Humidity and wind affect how the actual temperature feels.
Wind
10 km/h
Max gust 22 km/h
Activities Recommended for September
September Travel Pros & Cons
Pros
- Chiefs NFL regular season opener mid-September (MASSIVE city celebration)
- Kansas Speedway NASCAR Cup Series race weekend mid-September
- Humidity finally breaking mid-month — pleasant walking weather returns
- Plaza Art Fair fall edition third weekend
- Year's underrated sweet spot late September after Chiefs/Speedway overlap settles
Cons
- Chiefs season opener + Speedway overlap = year's busiest stretch (+50-80% hotel surge)
- Crowds at year-second peak
- 8 rainy days/month + afternoon thunderstorm contingency
- Worlds of Fun closes Labor Day
September Events & Festivals
- Chiefs NFL regular season opener (mid-September, MASSIVE city celebration)
- Kansas Speedway NASCAR Cup Series race weekend (mid-September)
- Royals MLB final regular season home games
- Plaza Art Fair fall edition (third weekend September)
Kansas City in September — Full Picture
September is genuinely Kansas City's year-second sweet spot alongside May — humidity finally breaking mid-month + 26°C / 79°F pleasant walking weather + Chiefs NFL regular season opener mid-month (MASSIVE city celebration) + Kansas Speedway NASCAR Cup Series race weekend mid-September + atmospheric Plaza Art Fair late month.
The canonical 'late summer + autumn transition + Chiefs football return + Mosel-no-wait — Royals stretch run' window. Chiefs NFL regular season opener weekend mid-September drives MASSIVE hotel surge +50-80% across downtown — book 6-8 weeks ahead. Kansas Speedway race weekend mid-September another +40-60% surge.
Most travelers underestimate the Chiefs-NFL-season-opener atmospheric weight — the entire city operates on Chiefs game pacing from September through January, with 'Red Friday' Chiefs-color wear becoming citywide. Visitors during Chiefs season see the city literally glow red.
What to Wear & What to Pack
Early autumn transition — daytime 26°C / 79°F, nighttime 15°C / 59°F + humidity finally breaking mid-month. T-shirt + light jacket + sweater layers for cooler mornings/evenings + comfortable walking shoes. Chiefs NFL regular season opener mid-month + Kansas Speedway NASCAR race weekend.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
18.7°C
7°C
10.3/mo
Summer (Jun·Jul·Aug)
30.7°C
19.7°C
8.7/mo
Autumn (Sep·Oct·Nov)
Current18.7°C
8.3°C
7.7/mo
Winter (Dec·Jan·Feb)
5.3°C
-5°C
6/mo
Kansas City Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| 4° | -7° | 6d·30mm | 5h | 70% | 2 | Quiet | Low season | |
| 7° | -4° | 6d·35mm | 6h | 68% | 3 | Quiet | Low season | |
| 13° | 1° | 9d·60mm | 7h | 65% | 4 | Moderate | Shoulder | |
| 19° | 7° | 11d·95mm | 8h | 65% | 6 | Moderate | Shoulder | |
| May (Best) | 24° | 13° | 11d·130mm | 9h | 70% | 8 | Busy | Peak |
| June (Best) | 29° | 18° | 10d·130mm | 10h | 70% | 9 | Busy | Peak |
| 32° | 21° | 8d·95mm | 10h | 70% | 10 | Busy | Peak | |
| 31° | 20° | 8d·95mm | 9h | 70% | 9 | Busy | Peak | |
| September (Best) | 26° | 15° | 8d·95mm | 8h | 70% | 7 | Very busy | Peak |
| October (Best) | 19° | 8° | 8d·90mm | 7h | 70% | 5 | Busy | Peak |
| 11° | 2° | 7d·50mm | 5h | 70% | 2 | Moderate | Shoulder | |
| 5° | -4° | 6d·35mm | 5h | 70% | 1 | Busy | Peak |
View Other Months
Kansas City September Hotel Picks
Frequently Asked Questions
Is September a good time to visit Kansas City?
Kansas City in September is very-high. Tourist crowds are very busy and flight/hotel prices are peak.
What's the average temperature in Kansas City in September?
Kansas City September averages a high of 26°C and a low of 15°C.
Does it rain much in Kansas City in September?
Kansas City September averages 95mm of rainfall over about 8 rainy days.
What should I wear in Kansas City in September?
Early autumn transition — daytime 26°C / 79°F, nighttime 15°C / 59°F + humidity finally breaking mid-month. T-shirt + light jacket + sweater layers for cooler mornings/evenings + comfortable walking shoes. Chiefs NFL regular season opener mid-month + Kansas Speedway NASCAR race weekend.
What time are sunrise and sunset in Kansas City in September?
Kansas City September sunrise is 07:00 and sunset is 19:30, with 12h 30min of daylight.
What's the air quality like in Kansas City in September?
Kansas City September air quality (AQI) averages 48, rated Good. PM2.5 averages 17μg/m³.
What activities are recommended in Kansas City in September?
In September, Kansas City is great for Chiefs NFL regular season opener mid-September Arrowhead Stadium, Kansas Speedway NASCAR Cup Series race weekend mid-September, Royals MLB final home games.
Is September peak season in Kansas City?
Kansas City September crowds are very busy and prices are peak. Advance reservations are strongly recommended.
Best Months to Visit Kansas City
View Other Months
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.