Chicago, Illinois Weather in January
Typical January in Chicago, Illinois: days around 32°F, nights around 19°F, and the month stays level from early to late — based on 30-year climate normals (NOAA, 1991–2020), day by day below.
32°Faverage high
19°Faverage low
≈0°Fearly vs late January
13°Fday-to-night swing
Early, mid and late January in Chicago
The month split in three — the part of the answer a 30-row table hides.
| Part of January | Avg high | Avg low |
|---|---|---|
| Early January (Jan 1–10) | 32°F | 20°F |
| Mid January (Jan 11–20) | 31°F | 18°F |
| Late January (Jan 21–31) | 31°F | 18°F |
Daylight in Chicago during January
How much light the day gives you — useful for planning what you can still do after work.
9 h 12 minon Jan 1
10 h 01 minon Jan 31
+49 mingained across January
Day-by-day January normals for Chicago
Long-term daily averages (NOAA 1991–2020) — climate, not a live forecast. For the next 16 days, use the live forecast.
| Day | Avg high | Avg low |
|---|---|---|
| Jan 1 | 33°F | 21°F |
| Jan 2 | 33°F | 21°F |
| Jan 3 | 33°F | 20°F |
| Jan 4 | 32°F | 20°F |
| Jan 5 | 32°F | 20°F |
| Jan 6 | 32°F | 20°F |
| Jan 7 | 32°F | 20°F |
| Jan 8 | 32°F | 20°F |
| Jan 9 | 32°F | 19°F |
| Jan 10 | 32°F | 19°F |
| Jan 11 | 32°F | 19°F |
| Jan 12 | 32°F | 19°F |
| Jan 13 | 31°F | 19°F |
| Jan 14 | 31°F | 19°F |
| Jan 15 | 31°F | 18°F |
| Jan 16 | 31°F | 18°F |
| Jan 17 | 31°F | 18°F |
| Jan 18 | 31°F | 18°F |
| Jan 19 | 31°F | 18°F |
| Jan 20 | 31°F | 18°F |
| Jan 21 | 31°F | 18°F |
| Jan 22 | 31°F | 18°F |
| Jan 23 | 31°F | 18°F |
| Jan 24 | 31°F | 18°F |
| Jan 25 | 31°F | 18°F |
| Jan 26 | 31°F | 18°F |
| Jan 27 | 31°F | 18°F |
| Jan 28 | 31°F | 18°F |
| Jan 29 | 32°F | 18°F |
| Jan 30 | 32°F | 18°F |
| Jan 31 | 32°F | 18°F |
January in Chicago through the years
Real photos taken in Chicago in January by Weathershot app users — different years, same month.
More months: September · October · November · December · Live Chicago forecast
January elsewhere: Atlanta weather in January · Denver weather in January · Miami weather in January · New York weather in January · Phoenix weather in January · Seattle weather in January
Weathershot
The January photos above were taken with Weathershot — it stamps the real weather onto your picture. Snap one in Chicago and it could land on this page.
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Climate normals: NOAA 1991–2020 (GHCND). Photos: Weathershot community, taken on location. © Weathershot · Byss Mobile