Weather in Chicago 🇺🇸
Monthly weather averages & travel planning
May
Avg Temp
22°C
Rain Days
6 days
Sun Hours
7 hrs
Humidity
65%
North America › 🇺🇸 United States › Chicago
Updated: March 2026
Is May a Good Time to Visit Chicago?
6/10
Good
May is a good time to visit Chicago (6/10). With 7 daily sunshine hours and only 6 rain days, this month delivers genuinely reliable outdoor conditions, ranking it the sunniest month of the year in Chicago. Culture-focused travellers and those who prefer lighter crowds will find May a practical choice, with prices running lower than peak May without sacrificing all the good weather. June 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 April:19°C avg high
May weather in Chicago is defined by a daily temperature swing from 10°C at night to 22°C during the afternoon. Humidity averages 65%, and you can count on around 7 sunshine hours each day. That combination makes May warm and lush, though dressing in breathable fabrics keeps things manageable.
22°C
72°F
Avg High
10°C
50°F
Avg Low
6 days
67 mm total
Rain Days
7h
per day avg
Sunshine
65%
Moderate
Humidity
Temperature in Chicago in May
The 12°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 9 this month, classed as high to very high. SPF 30+ sunscreen, a brim hat, and sunglasses are not optional between 10am and 4pm. Wind averages 15 km/h, light enough to be refreshing on warm days but noticeable in open coastal areas or elevated viewpoints. In Fahrenheit: 72°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 May
Morning10°CBefore the day warms up
Afternoon22°CPeak daytime temperature
Evening13°CAfter sunset cools down
Packing for Chicago in May means dressing for 22°C days and 10°C evenings. A light cotton tee with a casual overshirt works well at 22°C, the overshirt doubles as a layer for air-conditioned venues. Evenings drop 12°C to around 10°C, a notable shift that catches underprepared visitors off guard. Pack a dedicated evening layer. Comfortable walking trainers are the versatile choice for both outdoor sightseeing and indoor venues.
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 May
May 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 May
Based on 22°C average highs and 6 rainy days
- Light jacket or cardigan for cooler evenings
- Mix of short and long-sleeve layers
- Comfortable walking shoes with good arch support
- Universal travel adapter
- Small day pack for city exploration
- Reusable water bottle
Best Activities in Chicago in May
- Explore outdoor markets and street food stallsMid-morning (10am-12pm)At 22°C, the temperature is ideal for extended walking without overheating
- Guided walking tour of the historic centreMorning or late afternoonComfortable temperatures allow several hours on foot without fatigue
- Visit rooftop viewpoints and observation decksGolden hour (1 hour before sunset)Warm clear evenings provide exceptional visibility for panoramic photography
- Day trip to the surrounding countryside or coastFull day (depart by 8am)May is reliably dry enough for rural day trips without weather risk
- 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 morningMay 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-1pmMay seasonal produce is at peak availability, offering dishes not found at other times of year
Why is Chicago mild in May?
May marks the transition into warmer conditions in Chicago, as the sun angle climbs and day length extends. Temperatures averaging 22°C by day and 10°C overnight reflect a city shaking off winter: the morning air still carries a cool edge, but afternoons are noticeably warmer than even four weeks prior. At 42 degrees north latitude, spring is one of the most dynamic periods in the annual cycle, with weekly temperature changes that can be larger than the month-to-month shifts of summer. This volatility is part of the appeal: Chicago in May has a freshness and energy that peak-summer heat tends to mute. The warmth is sufficient for outdoor dining and long walking days. 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 May
In May, Chicago experiences average highs of 22°C (72°F) and lows of 10°C (50°F). Expect around 6 rainy days and 7 hours of sunshine per day, with humidity averaging 65%. The 12°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 9, so sun protection is advisable on clear days.
Chicago typically sees 6 rainy days in May, with total precipitation of around 67mm. This makes May one of the drier months of the year, and a reliable window for outdoor sightseeing and day trips. Rain showers tend to be brief when they do occur. For context, the driest month in Chicago typically sees 4-6 fewer rain days than May.
Pack light layers, a light jacket for evenings, comfortable walking shoes, and sunscreen for Chicago in May. Daytime temperatures of 22°C are pleasant, but the evening drop to 10°C means a jacket is essential if you plan to be out after dark. Rain is infrequent with only 6 wet days, so a light rain layer is optional. Comfortable walking shoes are a priority given the amount of ground most visitors cover.
May is a reasonable time to visit Chicago. Expect 6 rainy days, so pack a light rain layer for flexibility. Average temperatures of 22°C make outdoor exploration comfortable during the dry periods. With 7 daily sunshine hours, there are reliable windows of good weather to plan outdoor activities around, even if the month is not the driest on the calendar.
The average high temperature in Chicago in May is 22°C (72°F), and the average low is 10°C (50°F). The mean daily temperature is approximately 16°C (61°F). The day-to-night range of 12°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 May. May offers the most sunshine at 7 hours per day and only 6 rainy days. Average temperatures reach 22°C, making it comfortable for sightseeing, outdoor dining, and exploring the city. If your travel dates are flexible, planning your trip around May gives you the best chance of dry, bright weather.
May is shoulder or low season in Chicago, meaning fewer tourists and generally lower prices than peak months. With 7 sunshine hours and 6 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 May, Chicago suits a range of activities thanks to mild temperatures around 22°C. With few rainy days, outdoor activities are highly recommended. Top options include exploring historic neighbourhoods, visiting museums and galleries, local food markets, and day trips to surrounding areas. With 7 hours of sunshine, parks and waterfront walks are particularly enjoyable.
May ranks 1st sunniest of the year in Chicago, with an average 7 daily sunshine hours. The driest months are January, February, and October. June is the hottest month (24°C avg high); December is the coolest (3°C). From here, temperatures rise 2°C into June. Compared to last month (April: 19°C high, 5 rain days), May is warmer and wetter. May is among the top three sunniest months to visit Chicago.
Year-Round Climate
| Month | High | Low | Rain Days | Sun | Details |
|---|---|---|---|---|---|
| January | 4°C | -8°C | 3 | 1h | View |
| February | 8°C | -4°C | 3 | 3h | View |
| March | 13°C | 1°C | 4 | 4h | View |
| April | 19°C | 7°C | 5 | 6h | View |
| May | 22°C | 10°C | 6 | 7h | View |
| June | 24°C | 12°C | 6 | 7h | View |
| July | 22°C | 10°C | 6 | 7h | View |
| August | 19°C | 7°C | 5 | 6h | View |
| September | 13°C | 1°C | 4 | 4h | View |
| October | 8°C | -4°C | 3 | 3h | View |
| November | 4°C | -8°C | 3 | 1h | View |
| December | 3°C | -9°C | 3 | 1h | View |
January
3 rain days, 1h sun
4°-8°
February
3 rain days, 3h sun
8°-4°
March
4 rain days, 4h sun
13°1°
April
5 rain days, 6h sun
19°7°
May
6 rain days, 7h sun
22°10°
June
6 rain days, 7h sun
24°12°
July
6 rain days, 7h sun
22°10°
August
5 rain days, 6h sun
19°7°
September
4 rain days, 4h sun
13°1°
October
3 rain days, 3h sun
8°-4°
November
3 rain days, 1h sun
4°-8°
December
3 rain days, 1h sun
3°-9°
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.