Cairo, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Cairo, a city in Alexander County, Illinois.
This Afternoon
101°F
Sunny
Sunny, with a high near 101. Heat index values as high as 107. Southwest wind around 5 mph.
7-day forecast for Cairo
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 101°F | Sunny | 5 mph SW | 6% |
| Tonight | 72°F | Mostly Clear | 2 mph SE | 8% |
| Saturday | 99°F | Sunny | 0 to 6 mph SW | 2% |
| Saturday Night | 72°F | Partly Cloudy | 3 mph SSW | 0% |
| Sunday | 98°F | Sunny | 1 to 7 mph WSW | 1% |
| Sunday Night | 72°F | Partly Cloudy | 3 mph NNW | 3% |
| Monday | 93°F | Partly Sunny then Chance Showers And Thunderstorms | 2 to 7 mph N | 36% |
| Monday Night | 66°F | Chance Showers And Thunderstorms | 3 to 7 mph N | 39% |
| Tuesday | 83°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 6 to 12 mph N | 24% |
| Tuesday Night | 60°F | Partly Cloudy | 5 to 12 mph N | 7% |
| Wednesday | 81°F | Mostly Sunny | 5 to 8 mph N | 3% |
| Wednesday Night | 59°F | Partly Cloudy | 3 to 7 mph NNE | 2% |
| Thursday | 81°F | Mostly Sunny | 3 to 7 mph NNE | 3% |
| Thursday Night | 60°F | Partly Cloudy | 2 to 6 mph NNE | 3% |
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 Sep 18, 2026.