Weather in Chicago 🇺🇸
Monthly weather averages & travel planning
October
Avg Temp
16°C
Rain Days
9 days
Sun Hours
8 hrs
Humidity
65%
North America › 🇺🇸 United States › Chicago
Updated: March 2026
Is October a Good Time to Visit Chicago?
5/10
Fair
October is a fair time to visit Chicago (5/10). With 8 daily sunshine hours and only 9 rain days, this month delivers genuinely reliable outdoor conditions, ranking it 8th sunniest of the year in Chicago. Culture-focused travellers and those who prefer lighter crowds will find October a practical choice, with prices running lower than peak June without sacrificing all the good weather. November offers a similar profile at lower hotel rates if dates are flexible. The main practical note: Chicago's popular sites are busiest between 10am and 3pm regardless of season. Arriving at opening time or after 4pm makes a significant difference to the experience. Planning tips: accommodation is generally available without long lead times, and flight prices are typically lower than peak season. Flexible travellers will find the best deals by booking 2-4 weeks ahead. Mid-week arrivals consistently unlock lower hotel rates than weekend check-ins.
vs September:22°C avg high
October weather in Chicago is defined by a daily temperature swing from 10°C at night to 16°C during the afternoon. Humidity averages 65%, and you can count on around 8 sunshine hours each day. That combination makes October warm and lush, though dressing in breathable fabrics keeps things manageable.
16°C
61°F
Avg High
10°C
50°F
Avg Low
9 days
85 mm total
Rain Days
8h
per day avg
Sunshine
65%
Moderate
Humidity
Temperature in Chicago in October
The 6°C day-night temperature range is typical for continental climates: a light jacket in the morning that you shed by midday and need again after sunset. Humidity averages 65%, which is comfortable for most visitors. On warmer days, lighter fabrics help with the mild stickiness in the afternoon. UV index averages 6 this month, classed as moderate. Sunscreen is a sensible precaution for extended outdoor time, particularly at midday. Wind averages 24 km/h, light enough to be refreshing on warm days but noticeable in open coastal areas or elevated viewpoints. In Fahrenheit: 61°F average high, 50°F overnight low. Data sourced from Open-Meteo ERA5 climate reanalysis (1991–2020 normals).
Temperature Trends
High
Low
Rainfall (mm)
0-20 mm21-50 mm51-100 mm100+ mm
What to Wear in Chicago in October
Morning10°CBefore the day warms up
Afternoon16°CPeak daytime temperature
Evening13°CAfter sunset cools down
Packing for Chicago in October means dressing for 16°C days and 10°C evenings. A mid-weight jacket over a sweater handles 16°C daytime temperatures; the combination stays comfortable all day without overheating. Evening temperatures settle at 10°C, a modest 6°C drop that a light cardigan or denim jacket covers. Comfortable walking trainers are the versatile choice for both outdoor sightseeing and indoor venues. A compact foldable umbrella weighs almost nothing and earns its keep across 9 potential rainy days.
Local tip: Layers are more practical than a single heavy garment in Chicago. The day-to-evening temperature shift rewards packing a versatile mid-layer you can add or remove as conditions change.
Events in Chicago in October
October has no major festivals or public holidays in Chicago, which is one of its practical advantages for independent travellers. Attractions run at lower capacity than during peak event periods, queues are shorter, and accommodation is easier to find without needing to book many months in advance. Local restaurants, markets, and transport operate at a relaxed pace, making this an ideal time for visitors who prefer a more authentic, unhurried experience of everyday city life rather than large crowds drawn in by a single major headline event.
What to Pack for Chicago in October
Based on 16°C average highs and 9 rainy days
- Light jacket or cardigan for cooler evenings
- Mix of short and long-sleeve layers
- Comfortable walking shoes with good arch support
- Compact folding umbrella
- Waterproof outer layer or packable rain jacket
- Quick-dry clothing that recovers fast after a shower
- Universal travel adapter
- Small day pack for city exploration
- Reusable water bottle
Best Activities in Chicago in October
- Explore the old town's cobblestone backstreetsMorning (9-11am)At 16°C, conditions are pleasant for unhurried exploration on foot
- Visit hilltop viewpoints for panoramic city viewsLate afternoon (4-6pm)Low sun angle creates dramatic light for photography while temperatures remain comfortable
- Bicycle rental for a half-day city circuitMid-morning startMild 16°C temperatures are ideal for extended cycling without excessive effort
- Boat tour of the river, bay, or canal networkLate morning departureComfortable weather makes open-deck boats viable without wind-chill concerns
- Afternoon in a world-class museum or galleryAfternoon (2-5pm)Pairs well with outdoor morning activities and provides a mid-day rest from sightseeing
- Coffee-house or traditional cafe culture experienceMid-morning or post-lunchA cultural ritual in this region that rewards slow appreciation regardless of weather
- Evening live music, theatre, or opera performanceEvening shows typically at 7-9pmConsistent evening temperatures make getting to and from evening venues comfortable
- Visit the main botanical garden or city park at seasonal peakYear-round; best light in morningOctober brings distinct seasonal changes to public green spaces worth exploring
- Try the seasonal farmer's market for local produce and street foodSaturday morning markets typically 8am-1pmOctober seasonal produce is at peak availability, offering dishes not found at other times of year
Why is Chicago mild in October?
October brings the first meaningful shift toward cooler conditions in Chicago, as the sun angle drops and day length shortens. Temperatures averaging 16°C by day and 10°C overnight are still comfortable by most standards, but the trend is clearly downward. At 42 degrees north latitude, autumn light has a particular quality: lower in the sky and warmer in tone, it gives the city a photogenic quality quite different from summer. Evening temperatures already demand a jacket, but midday hours stay pleasant for sightseeing. Climate data: Open-Meteo ERA5 (1991–2020).
Sunshine Hours
The average number of hours per day with direct sunlight. Calculated from satellite measurements. Days with more than 7 hours of sunshine are ideal for outdoor activities. Under 3 hours means overcast conditions dominate.
UV Index
A scale from 0-11+ measuring ultraviolet radiation intensity. UV 0-2: Minimal risk. UV 3-5: Moderate, wear sunscreen. UV 6-7: High, hat and SPF 30+ essential. UV 8-10: Very High, limit midday exposure. UV 11+: Extreme, seek shade between 10am-4pm.
Rain Days
A rain day is counted when precipitation exceeds 0.1mm. This threshold captures even light drizzle. Unlike total rainfall in mm, rain days tells you how often you might need an umbrella, which is useful for planning outdoor activities.
Humidity
Relative humidity as a percentage. Below 40%: Dry, skin and throat may feel parched. 40-60%: Comfortable, ideal for most people. 60-80%: Sticky, light breathable fabrics recommended. Above 80%: Muggy, heat feels more intense; quick-dry clothing is essential.
Frequently Asked Questions
Chicago in October
In October, Chicago experiences average highs of 16°C (61°F) and lows of 10°C (50°F). Expect around 9 rainy days and 8 hours of sunshine per day, with humidity averaging 65%. The 6°C gap between daytime and overnight temperatures is worth planning around: light layers work for most visitors during the day, but an extra jacket is essential for evenings. UV index averages 6, so sun protection is advisable on clear days.
Chicago typically sees 9 rainy days in October, with total precipitation of around 85mm. Rain is moderate and manageable. Showers tend to pass quickly, and a light rain layer or foldable umbrella is sufficient protection for most days. For context, the driest month in Chicago typically sees 4-6 fewer rain days than October.
Pack a warm jacket, sweaters, and layering pieces for Chicago in October. Temperatures can drop to 10°C at night, so thermal underlayers are advisable for evening outings. Waterproof footwear is important with 9 rainy days expected. A scarf, hat, and gloves handle the windchill on clear cold days, which often feel colder than the thermometer reads.
Yes, October is an excellent time to visit Chicago. With 8 daily sunshine hours and only 9 rainy days, conditions are ideal for sightseeing and outdoor activities. Temperatures averaging 16°C during the day are comfortable for long walks and outdoor dining. This is peak travel season, so booking accommodation in advance and arriving at popular attractions early in the morning helps avoid the busiest periods.
The average high temperature in Chicago in October is 16°C (61°F), and the average low is 10°C (50°F). The mean daily temperature is approximately 13°C (55°F). The day-to-night range of 6°C is moderate, meaning a single light jacket covers most situations. These are 30-year climate normals based on the 1991 to 2020 reference period; individual years will vary, particularly in transitional months like spring and autumn.
The best month to visit Chicago is generally July. July offers the most sunshine at 12 hours per day and only 11 rainy days. Average temperatures reach 27°C, making it comfortable for sightseeing, outdoor dining, and exploring the city. If your travel dates are flexible, planning your trip around July gives you the best chance of dry, bright weather.
October is shoulder or low season in Chicago, meaning fewer tourists and generally lower prices than peak months. With 8 sunshine hours and 9 rainy days, the weather is less of a draw for mass tourism. This is an advantage for travellers who prefer a quieter, more relaxed experience with shorter queues and easier accommodation availability.
In October, Chicago suits a range of activities thanks to cool conditions around 16°C. Mix of indoor and outdoor activities works well given the moderate chance of rain. Top options include exploring historic neighbourhoods, visiting museums and galleries, local food markets, and day trips to surrounding areas. With 8 hours of sunshine, parks and waterfront walks are particularly enjoyable.
October ranks 8th sunniest of the year in Chicago, with an average 8 daily sunshine hours. The driest months are February, January, and September. July is the hottest month (27°C avg high); January is the coolest (-1°C). From here, temperatures fall 8°C into November. Compared to last month (September: 22°C high, 9 rain days), October is cooler and equally dry. October sits in the middle of the annual sunshine ranking for Chicago, offering a reasonable balance of good weather and manageable crowds.
Year-Round Climate
| Month | High | Low | Rain Days | Sun | Details |
|---|---|---|---|---|---|
| January | -1°C | -7°C | 9 | 6h | View |
| February | 1°C | -6°C | 7 | 7h | View |
| March | 5°C | -2°C | 10 | 8h | View |
| April | 11°C | 4°C | 12 | 9h | View |
| May | 18°C | 11°C | 13 | 11h | View |
| June | 24°C | 18°C | 12 | 12h | View |
| July | 27°C | 21°C | 11 | 12h | View |
| August | 26°C | 20°C | 11 | 12h | View |
| September | 22°C | 16°C | 9 | 10h | View |
| October | 16°C | 10°C | 9 | 8h | View |
| November | 8°C | 3°C | 9 | 6h | View |
| December | 2°C | -3°C | 9 | 5h | View |
January
9 rain days, 6h sun
-1°-7°
February
7 rain days, 7h sun
1°-6°
March
10 rain days, 8h sun
5°-2°
April
12 rain days, 9h sun
11°4°
May
13 rain days, 11h sun
18°11°
June
12 rain days, 12h sun
24°18°
July
11 rain days, 12h sun
27°21°
August
11 rain days, 12h sun
26°20°
September
9 rain days, 10h sun
22°16°
October
9 rain days, 8h sun
16°10°
November
9 rain days, 6h sun
8°3°
December
9 rain days, 5h sun
2°-3°
Other Months in Chicago
Plan Your Trip to Chicago
Data Sources for Chicago
Climate normals represent 30-year averages (1991-2020). Individual years may vary.