30YearWeather
Chicago in September
Chicago weather in September - United States
😊Warm & Pleasant

Chicago Weather in September

Plan your September trip to Chicago, United States. Based on 30 years of NASA data, expect temperatures of 23°C (high) to 16°C (low), with 22% rain probability and 8 hours of daily sunshine. Great conditions with only 5 rainy days expected.

Avg High
23°C

Hottest around day 2

Avg Low
16°C

Coolest around day 30

Rainy Days
5days

22% avg rain chance

Sunshine
8hrs/day

Autumn season

Chicago September Weather Calendar

Click any day to see detailed weather information

Currency

USD

$ United States dollar

Language

English

Driving

Right side

Connect

The first Internet café in the United St...

Safety

Moderate Safety

GPI: 2.44

Travel Intelligence

Exclusive flight analytics & health data for Chicago

Smart Flight Estimator

Airport-to-Airport Logistics

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Add your home location in settings to see airport details.

Flight Connectivity Analysis

Airport traffic data & seasonal patterns

Major Hub
100/ 100
Traffic Index

Extremely busy airport

Peak Daily Arrivals

0

slots per day

Peak

Jun

Low

Jan

Monthly Traffic Distribution

1055
Jan
1174
Feb
1315
Mar
1276
Apr
1351
May
1367
Jun
1256
Jul
1331
Aug
1314
Sep
1222
Oct
1139
Nov
1185
Dec
Traffic Level
Low Season

Key Connections

New York La Guardia (LGA)
Dallas-Fort Worth (DFW)
Boston General Edward Lawrence Logan (BOS)
Washington Ronald Reagan National (DCA)
Newark Liberty (EWR)

Health & Safety Advisory

CDC travel health recommendations

No Requirements

No Special Vaccinations Required

Standard travel precautions apply

Source: CDC Travelers' Health

View Complete Health Guide

Is September a Good Time to Visit Chicago?

👍Recommended for planning your trip
Short Answer

Popular September in Chicago offers 23°C and 22% rain chance - excellent conditions that attract maximum visitors. Book 3-6 months ahead for best rates.

Decision Factors

Peak tourist season

96% of annual peak - expect crowds and peak prices

Ideal temperature range

22.7°C - perfect for sightseeing and outdoor activities

Plenty of sunshine

9.6h of sunshine daily

Exceptional dining scene

105 Michelin-listed restaurants

Good For

  • 👨‍👩‍👧‍👦
    Families with children

    Comfortable 22.7°C temperatures and low 22% rain risk

  • 👴
    Elderly travelers

    Comfortable 22.7°C temperature range with manageable humidity

  • 🥾
    Outdoor enthusiasts

    Ideal hiking conditions: 22.7°C, 22% rain chance

  • 📸
    Photographers

    9.6h sunshine, 53% clear skies for golden hour shots

  • 🏛️
    Cultural tourists

    Comfortable conditions for exploring museums and sites

Who Should Avoid

  • 💰
    Budget travelers

    Peak season means premium prices everywhere

900 observations30-year historical data
Confidence: 95%

"According to 30YearWeather's analysis of 30 years of NASA POWER satellite data,Chicago in September averages 23°C with 22% precipitation probability."

📊 Source: 30YearWeather.com🛰️ Data: NASA POWER (1991-2021)View Methodology →

Frequently Asked Questions: Chicago in September

What are the temperatures in Chicago in September?

Daytime highs average 23°C, nights drop to 16°C. Temperatures remain fairly consistent.

How many rainy days in Chicago in September?

Expect around 5 days with measurable rainfall. Rain is unlikely to disrupt plans.

What to wear in Chicago in September?

Comfortable casual wear with a light jacket for evenings.

Is September peak season in Chicago?

This is typically peak season with higher prices. Book 2-3 months ahead.