Illinois month by month

The next 12 months outside in Illinois: what the weather usually does in Chicago, Rockford and Springfield, and what's already on the calendar. Races and programs further out are still being posted, so the later months fill in over time.

October 2026
114 events listed
Chicago
61° / 48°
Typical high / low
Rockford
62° / 42°
Rain or snow 1 day in 3
Springfield
66° / 44°
Rain or snow 1 day in 3
- Coffee Lovers Run 5K/10K/13.1 CHICAGO/EVANSTONSat, Oct 10 · 7:30 AM · half marathon, 5K, 10K · Chicago
- Cookie Run 5K/10K/13.1 CHICAGO/EVANSTONSat, Oct 10 · 7:30 AM · half marathon, 5K, 10K · Chicago
- Chicago Fall Classic Half Marathon, 10K & 5KSat, Oct 17 · 7:10 AM · half marathon, 10K, 5K · Chicago
November 2026
108 events listed
Chicago
48° / 36°
Typical high / low
Rockford
47° / 31°
Rain or snow 1 day in 3
Springfield
53° / 33°
Rain or snow 1 day in 3
- Warrior Rush - Army of Hades - 5K, 10K, and Half Marathon 13.1Sun, Nov 1 · 8:00 AM · half marathon, 5K, 10K · New Lenox
- 14th Annual Springfield Marathon & Harvest Wind Half Marathon & 10KSat, Nov 7 · 8:00 AM · half marathon, marathon, 10K · Danenberger Family Vineyards, New Berlin
- Run for Mental Health 5K/10K/13.1 CHICAGO/EVANSTONSat, Nov 14 · 7:30 AM · half marathon, 5K, 10K · Chicago
December 2026
44 events listed
Chicago
37° / 25°
Typical high / low
Rockford
34° / 20°
Rain or snow 1 day in 3
Springfield
41° / 24°
Rain or snow 1 day in 3
- Running races (41)
- Big races (4)
- Trail races (2)
- Bike rides and races (1)
- Ranger programs (1)
- Run for Breast Cancer 5K/10K/13.1 CHICAGO/EVANSTONSat, Dec 12 · 7:30 AM · half marathon, 5K, 10K · Chicago
- Sunrise Marathon 5K/10K/13.1 CHICAGO/EVANSTONSat, Dec 12 · 7:30 AM · half marathon, marathon, 5K, 10K · Chicago
- A Merry Christmas Run 5K/10K/13.1 CHICAGO/EVANSTONSat, Dec 26 · 7:30 AM · half marathon, 5K, 10K · Chicago
January 2027
13 events listed
Chicago
32° / 20°
Typical high / low
Rockford
29° / 15°
Rain or snow 1 day in 3
Springfield
36° / 19°
Rain or snow 1 day in 3
- Time Travel Half-Marathon/5K/10K - Greater ChicagoSat, Jan 2 · 9:00 AM · half marathon, 5K, 10K · TBD, Greater Chicago
- MLK Jr. Freedom Run 5K/10K/13.1 CHICAGO/EVANSTONSat, Jan 16 · 7:30 AM · half marathon, 5K, 10K · Chicago
- Sunrise Marathon 5K/10K/13.1 CHICAGO/EVANSTONSat, Jan 16 · 7:30 AM · half marathon, marathon, 5K, 10K · Chicago
February 2027
8 events listed
Chicago
36° / 23°
Typical high / low
Rockford
34° / 18°
Rain or snow 1 day in 3
Springfield
41° / 22°
Rain or snow 1 day in 3
- Fly with the Eagles Half MarathonSat, Feb 13 · 7:00 AM · half marathon · Murphysboro
- Run for Chocolate 5K/10K/13.1 CHICAGO/EVANSTONSat, Feb 13 · 7:30 AM · half marathon, 5K, 10K · Chicago
- Valentine's Day Run 5K/10K/13.1 CHICAGO/EVANSTONSat, Feb 13 · 7:30 AM · half marathon, 5K, 10K · Chicago
March 2027
14 events listed
Chicago
45° / 31°
Typical high / low
Rockford
46° / 28°
Rain or snow 1 day in 3
Springfield
52° / 31°
Rain or snow 1 day in 3
April 2027
3 events listed
Chicago
55° / 40°
Typical high / low
Rockford
60° / 38°
Rain or snow 1 day in 3
Springfield
65° / 41°
Rain or snow 1 day in 3
- Running races (3)
- Big races (2)
- Chi Town Half Marathon & 10KSat, Apr 3 · 7:00 AM · half marathon, 10K · Chicago
- DoNot Stop Half Marathon/5K/10K - Greater ChicagoSat, Apr 3 · 8:00 AM · half marathon, 5K, 10K · TBD, Greater Chicago
Listings for April are still coming in. Check back closer to the date.
May 2027
Nothing listed yet
Chicago
66° / 50°
Typical high / low
Rockford
71° / 49°
Rain or snow 1 day in 2
Springfield
73° / 53°
Rain or snow 1 day in 3
Listings for May are still coming in. Check back closer to the date.
June 2027
Nothing listed yet
Chicago
76° / 60°
Typical high / low
Rockford
81° / 60°
Rain or snow 1 day in 3
Springfield
83° / 63°
Rain or snow 1 day in 3
Listings for June are still coming in. Check back closer to the date.
July 2027
Nothing listed yet
Chicago
81° / 67°
Typical high / low
Rockford
84° / 64°
Rain or snow 1 day in 3
Springfield
86° / 66°
Rain or snow 1 day in 3
Listings for July are still coming in. Check back closer to the date.
August 2027
Nothing listed yet
Chicago
80° / 67°
Typical high / low
Rockford
82° / 62°
Rain or snow 1 day in 3
Springfield
84° / 64°
Rain or snow 1 day in 4
Listings for August are still coming in. Check back closer to the date.
September 2027
Nothing listed yet
Chicago
73° / 60°
Typical high / low
Rockford
75° / 53°
Rain or snow 1 day in 3
Springfield
78° / 56°
Rain or snow 1 day in 4
Listings for September are still coming in. Check back closer to the date.

Typical weather is the NOAA 1991–2020 average at the nearest weather station to each city.