Cairo, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Cairo, a city in Alexander County, Illinois.
Today
87°F
Patchy Fog then Sunny
Patchy fog before 8am. Sunny. High near 87, with temperatures falling to around 85 in the afternoon. East northeast wind 0 to 3 mph.
7-day forecast for Cairo
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Patchy Fog then Sunny | 0 to 3 mph ENE | 0% |
| Tonight | 66°F | Mostly Clear | 2 mph ENE | 0% |
| Wednesday | 89°F | Sunny | 1 mph S | 0% |
| Wednesday Night | 70°F | Partly Cloudy | 1 mph SSE | 0% |
| Thursday | 90°F | Partly Sunny | 1 to 6 mph SSW | 12% |
| Thursday Night | 72°F | Chance Showers And Thunderstorms | 1 to 5 mph S | 38% |
| Friday | 89°F | Chance Showers And Thunderstorms | 2 to 6 mph SSW | 38% |
| Friday Night | 71°F | Chance Showers And Thunderstorms | 3 mph SSW | 40% |
| Saturday | 89°F | Chance Showers And Thunderstorms | 3 mph SW | 34% |
| Saturday Night | 71°F | Chance Showers And Thunderstorms then Partly Cloudy | 2 mph S | 25% |
| Sunday | 91°F | Mostly Sunny | 2 to 6 mph SSW | 10% |
| Sunday Night | 72°F | Mostly Clear | 5 mph SSW | 10% |
| Monday | 92°F | Sunny | 3 to 7 mph SSW | 5% |
| Monday Night | 73°F | Mostly Clear | 6 mph SSW | 4% |
Forecast source: National Weather Service (api.weather.gov) for Cairo (37.006, -89.183). Updated through the day.
Growing snapshot for Cairo
Last spring frost
Apr 2
First fall frost
Oct 31
Growing season
211 days
Hardiness zone
7a
More local growing data for Cairo: nearby ZIP 62914 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Cairo 3N, Il (1 mi from Cairo). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.