Joslin, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Joslin, a community in Rock Island County, Illinois.
Today
82°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 11am, then a chance of showers and thunderstorms between 11am and noon, then a slight chance of showers and thunderstorms between noon and 1pm, then a chance of showers and thunderstorms between 1pm and 4pm, then a chance of showers and thunderstorms. Some of the storms could produce heavy rain. Mostly cloudy, with a high near 82. South wind around 10 mph. Chance of precipitation is 50%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Joslin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 82°F | Chance Showers And Thunderstorms | 10 mph S | 52% |
| Tonight | 65°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 to 10 mph W | 88% |
| Sunday | 71°F | Patchy Fog | 10 to 15 mph NE | 75% |
| Sunday Night | 57°F | Chance Rain Showers | 15 mph NE | 45% |
| Monday | 65°F | Rain Showers Likely | 15 mph NE | 56% |
| Monday Night | 52°F | Chance Rain Showers | 10 to 15 mph NE | 43% |
| Tuesday | 63°F | Slight Chance Rain Showers | 15 mph NE | 20% |
| Tuesday Night | 49°F | Partly Cloudy | 5 to 15 mph NE | 8% |
| Wednesday | 67°F | Mostly Sunny | 10 mph NE | 2% |
| Wednesday Night | 51°F | Partly Cloudy | 5 to 10 mph NE | 1% |
| Thursday | 69°F | Mostly Sunny | 5 to 10 mph NE | 5% |
| Thursday Night | 53°F | Partly Cloudy | 5 mph NE | 5% |
| Friday | 73°F | Mostly Sunny | 5 to 10 mph NE | 4% |
| Friday Night | 53°F | Partly Cloudy | 5 mph E | 4% |
Forecast source: National Weather Service (api.weather.gov) for Joslin (41.545, -90.222). Updated through the day.
Growing snapshot for Joslin
Last spring frost
Apr 16
First fall frost
Oct 25
Growing season
190 days
Hardiness zone
5b
More local growing data for Joslin: nearby ZIP 61257 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Le Claire L&D 14, Ia (9.3 mi from Joslin). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.