United States Chicago Weather in May (excellent) — Climate Guide
May (excellent) in Chicago is Excellent
Chicago Weather in May (excellent) — Quick Answer
As of 2026- Avg temp
- 20° / 10°
- Rainfall
- 105mm · 12 days
- Crowds
- Moderate
As of 2026, Chicago in May (excellent) averages a high of 20°C and low of 10°C with 105mm of rain over about 12 days. Late spring — high 20°C, low 10°C. T-shirt afternoons + light jacket evenings. Sunscreen + sunglasses. Light rain shell for spring storms.
May (excellent) is Excellent for Chicago.
May is the sleeper-best Chicago month. Weather warming (20°C average) but not yet peak summer crowds. Hotel rates still moderate. Outdoor festivals + patios + lakefront all open. Architecture Cruise + Wrigley + Mag Mile all comfortable. Memorial Day weekend marks the start of summer-season festivities.
Travel score
Chicago May (excellent) Weather Stats
Avg High
20°C
Avg Low
10°C
Rainy Days
12
105mm total
Sunshine
9h
Daily avg
Humidity
64%
Comfortable
UV Index
7
High
Wind
15 km/h
Gusts 32
Sea Temp
9°C
Avg water temp
Crowds
Moderate
At attractions
May (excellent) Sunrise & Sunset
Air Quality
PM2.5
12 μg/m³
PM10
22 μg/m³
Status
Good
Feels-Like Temperature & Wind
Feels like
Daytime
20°C
Nighttime
10°C
Humidity and wind affect how the actual temperature feels.
Wind
15 km/h
Max gust 32 km/h
Activities Recommended for May (excellent)
May (excellent) Travel Pros & Cons
Pros
- Weather 20/10°C ideal
- Outdoor patios open
- Memorial Day festivities
- Hotel rates still moderate
Cons
- Spring storms continue
- Lake water still cool (9°C)
May (excellent) Events & Festivals
- Memorial Day weekend (last Monday)
- Outdoor patio season begins
- Lincoln Park Zoo full attendance
Chicago in May (excellent) — Full Picture
May is the sleeper-best Chicago month. Weather warming (20°C average) but not yet peak summer crowds. Hotel rates still moderate. Outdoor festivals + patios + lakefront all open. Architecture Cruise + Wrigley + Mag Mile all comfortable. Memorial Day weekend marks the start of summer-season festivities.
What to Wear & What to Pack
Late spring — high 20°C, low 10°C. T-shirt afternoons + light jacket evenings. Sunscreen + sunglasses. Light rain shell for spring storms.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
Current13.7°C
3.7°C
11.7/mo
Summer (Jun·Jul·Aug)
27.7°C
17.7°C
10/mo
Autumn (Sep·Oct·Nov)
15.7°C
6.7°C
9.7/mo
Winter (Dec·Jan·Feb)
0.3°C
-8°C
9.3/mo
Chicago Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| -1° | -10° | 10d·50mm | 4h | 73% | 1 | Quiet | Low season | |
| 1° | -9° | 9d·45mm | 5h | 71% | 2 | Quiet | Low season | |
| 7° | -3° | 11d·70mm | 6h | 67% | 3 | Quiet | Low season | |
| 14° | 4° | 12d·95mm | 7h | 64% | 5 | Moderate | Shoulder | |
| May (excellent) (Best) | 20° | 10° | 12d·105mm | 9h | 64% | 7 | Moderate | Shoulder |
| June (early summer) (Best) | 26° | 16° | 11d·100mm | 10h | 65% | 8 | Busy | Peak |
| July (peak summer) (Best) | 29° | 19° | 10d·100mm | 10h | 67% | 9 | Very busy | Peak |
| August (Lollapalooza) (Best) | 28° | 18° | 9d·100mm | 9h | 68% | 8 | Very busy | Peak |
| September (best month) (Best) | 24° | 13° | 9d·95mm | 9h | 67% | 6 | Busy | Shoulder |
| 16° | 7° | 10d·80mm | 7h | 67% | 4 | Moderate | Shoulder | |
| 7° | 0° | 10d·70mm | 5h | 73% | 2 | Quiet | Low season | |
| 1° | -5° | 9d·60mm | 4h | 75% | 1 | Busy | Peak |
View Other Months
Chicago May (excellent) Hotel Picks
Frequently Asked Questions
Is May (excellent) a good time to visit Chicago?
Chicago in May (excellent) is Excellent. Tourist crowds are moderate and flight/hotel prices are shoulder.
What's the average temperature in Chicago in May (excellent)?
Chicago May (excellent) averages a high of 20°C and a low of 10°C.
Does it rain much in Chicago in May (excellent)?
Chicago May (excellent) averages 105mm of rainfall over about 12 rainy days.
What should I wear in Chicago in May (excellent)?
Late spring — high 20°C, low 10°C. T-shirt afternoons + light jacket evenings. Sunscreen + sunglasses. Light rain shell for spring storms.
What time are sunrise and sunset in Chicago in May (excellent)?
Chicago May (excellent) sunrise is 05:30 and sunset is 20:05, with 14h 35m of daylight.
What's the air quality like in Chicago in May (excellent)?
Chicago May (excellent) air quality (AQI) averages 38, rated Good. PM2.5 averages 12μg/m³.
What activities are recommended in Chicago in May (excellent)?
In May (excellent), Chicago is great for Architecture Cruise, Wrigley Field Cubs, Mag Mile walking.
Is May (excellent) peak season in Chicago?
Chicago May (excellent) crowds are moderate and prices are shoulder. You can travel relatively comfortably without long queues.
Best Months to Visit Chicago
View Other Months
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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.