What to expect in Chicago in October
October is a strong choice for Chicago: 17° / 6°, with manageable crowds at the big attractions and prices close to the yearly average.
Chicago weather in October
Typical conditions in Chicago during October, based on long-run climate normals rather than any single year. Treat it as a planning guide, not a forecast.
| Average high | 17°C 63°F |
|---|---|
| Average low | 6°C 43°F |
| Rainfall | Moderate 48/100 |
| Total rainfall | 80 mm3.1 in |
| Rainy days | 10 |
| Daylight | 11 h 5 min |
| How it feels | Mild — layers weather |
Average highs sit around 17°C with lows near 6°C. Rainfall is moderate; the odd shower is likely.
Crowds & demand
Crowd levels are Moderate for Chicago — manageable crowds at the big attractions.
Prices & value
This month counts as shoulder season: prices close to the yearly average.
What to pack
Layers you can shed: 17°C by day and about 6°C after dark is a two-jacket kind of month.
What it costs
Costs in October sit around the yearly average for Chicago — neither a bargain nor a squeeze. Booking a few weeks out is usually enough. Compared with the most expensive month of the year, you are looking at roughly 32% less.
Who this month suits
- Travellers who want the most reliable weather
- Anyone travelling on a budget
- Visitors who want to catch a festival
Events & what’s on
Look out for Chicago Marathon while you’re there.
- Chicago Marathon — One of the World Marathon Majors, run through the city each October.
Chicago in October compared with nearby months
If your dates are flexible by a few weeks, this is what shifting them actually buys you.
| Month | Temp | Crowds | Price | Score |
|---|---|---|---|---|
| August | 28° / 17° | High | $$$ | 42 |
| September | 24° / 12° | High | $$ | 57 |
| October · This month | 17° / 6° | Moderate | $$ | 53 |
| November | 9° / 0° | Moderate | $$ | 51 |
| December | 2° / -6° | Moderate | $$ | 40 |
These months score higher for Chicago on the same blend of weather, crowds and price. Same destination, better odds.
Or go somewhere else in October
If the destination is negotiable but the month is not, these places are at their best in October.
Figures are climate normals and modelled estimates — a planning guide, not a forecast. We separate fact, estimate and recommendation. Updated October 2026
