What October feels like in Chicago
In Chicago, October brings mid-autumn. Afternoons are cool, pleasant for walking as long as you keep a layer on. Little changes after sunset — nights are cool, only slightly below the daytime level. Moisture in the air gives the cold a damp edge.
Rain in Chicago in October
Expect a mix of dry and wet days, with rain about one day in 3. When rain comes it is heavy, about 9.5 mm (0.4 in) per wet day, often in short, strong bursts. Across the year Chicago averages about 8.5 mm per rainy day, so October is typical.
Daylight and sunshine in October
In mid-October, sunrise is at about 7:01 am and sunset at about 6:11 pm (local time) — 11 h 10 min of daylight. Days are getting shorter: 1 h 23 min less daylight than in mid-September. Measured sunshine covers about 69% of the daylight — there are plenty of bright spells.
How October compares to the rest of the year
October is the 6th warmest month of the year in Chicago. Against September, the average high is 6.8°C (12.2°F) lower, with 15 mm more rain. The cooling trend carries on into November. By November, typical highs are 8.4°C (47.1°F).
Who October suits
- Sightseeing: a good fit — daytime temperatures are fine for walking around.
- Parks & outdoor: a good fit — comfortable for long walks and picnics.
- Beach: less ideal — the sea air is too cool.
Tips for visiting Chicago in October
Rain Protection
A packable rain jacket saves the day on showery afternoons.
Light Jacket
Bring a sweater or light coat for cool afternoons.
Sunglasses
Plenty of sun, so bring sunglasses and a cap.
Quick questions
How warm is Chicago in October?
Afternoons average 15.8°C (60.4°F) and nights about 9.4°C (48.9°F) — cool by most people's standards. It is the 6th warmest month of the year.
Does it rain a lot in Chicago in October?
Quite a lot — 105 mm spread over about 11 days.
What should I wear in Chicago in October?
Based on the averages: rain protection, a light jacket and sunglasses. Evenings feel similar to the day, so the same clothes work from morning to night.
Is October or November better for visiting Chicago?
On our 12-month climate ranking, October comes out ahead (#6 of 12 vs #7). November is cooler and has fewer rainy days.