San Jose, IL Weather & Growing Conditions
This Afternoon
71°F
Light Rain
Rain and a slight chance of thunderstorms. Mostly cloudy. High near 71, with temperatures falling to around 65 in the afternoon. South wind around 18 mph, with gusts as high as 33 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 71°F | Light Rain | 18 mph S | 84% |
| Tonight | 53°F | Rain | 13 to 17 mph S | 79% |
| Wednesday | 60°F | Chance Rain Showers then Mostly Cloudy | 12 to 15 mph SW | 12% |
| Wednesday Night | 45°F | Mostly Cloudy | 10 mph SW | 1% |
| Thursday | 60°F | Mostly Sunny | 8 to 13 mph WSW | 7% |
| Thursday Night | 42°F | Mostly Cloudy then Slight Chance Light Rain | 7 mph NW | 23% |
| Friday | 55°F | Partly Sunny then Slight Chance Light Rain | 7 to 10 mph NNW | 15% |
| Friday Night | 35°F | Partly Cloudy | 2 to 8 mph NNW | 3% |
| Saturday | 54°F | Mostly Sunny | 5 mph NW | 2% |
| Saturday Night | 34°F | Partly Cloudy | 2 mph W | 2% |
| Sunday | 60°F | Sunny | 2 to 8 mph WNW | 11% |
| Sunday Night | 34°F | Mostly Clear | 6 mph W | 5% |
| Monday | 65°F | Sunny | 3 to 10 mph SW | 2% |
| Monday Night | 39°F | Mostly Clear | 3 to 7 mph WSW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for San Jose, IL
Last spring frost
Apr 17
First fall frost
Oct 18
Growing season
182 days
Hardiness zone
6a
Explore more for San Jose, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Mason City 4Se, Il (9.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.