Cairo, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Cairo, a city in Alexander County, Illinois.
This Afternoon
79°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 5pm. Partly sunny. High near 79, with temperatures falling to around 75 in the afternoon. South southeast wind 15 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 20%.
7-day forecast for Cairo
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 79°F | Slight Chance Showers And Thunderstorms | 15 to 18 mph SSE | 20% |
| Tonight | 57°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 6 to 14 mph S | 99% |
| Wednesday | 69°F | Partly Sunny | 5 to 9 mph WSW | 7% |
| Wednesday Night | 43°F | Partly Cloudy | 3 mph SW | 0% |
| Thursday | 69°F | Sunny | 1 to 6 mph SW | 0% |
| Thursday Night | 45°F | Partly Cloudy | 2 mph W | 3% |
| Friday | 64°F | Partly Sunny | 2 to 9 mph NNW | 1% |
| Friday Night | 39°F | Partly Cloudy | 2 to 6 mph N | 1% |
| Saturday | 59°F | Mostly Sunny | 5 mph N | 0% |
| Saturday Night | 35°F | Partly Cloudy | 1 mph NNW | 1% |
| Sunday | 63°F | Sunny | 0 to 6 mph WNW | 5% |
| Sunday Night | 35°F | Mostly Clear | 2 mph NW | 6% |
| Monday | 65°F | Sunny | 1 to 7 mph W | 1% |
| Monday Night | 38°F | Mostly Clear | 2 mph W | 0% |
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 Nov 3, 2026.