Williams, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Williams, a city in Hamilton County, Iowa.
Overnight
66°F
Patchy Fog
Patchy fog and a chance of showers and thunderstorms before 3am, then showers and thunderstorms likely. Cloudy. Low around 66, with temperatures rising to around 68 overnight. Southeast wind 7 to 10 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Williams
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 66°F | Patchy Fog | 7 to 10 mph SE | 66% |
| Saturday | 76°F | Chance Showers And Thunderstorms then Patchy Fog | 8 mph WNW | 46% |
| Saturday Night | 59°F | Slight Chance Showers And Thunderstorms | 8 to 12 mph N | 24% |
| Sunday | 65°F | Chance Rain Showers | 12 to 15 mph NE | 37% |
| Sunday Night | 52°F | Chance Rain Showers | 13 mph ENE | 29% |
| Monday | 61°F | Chance Rain Showers | 10 to 14 mph ENE | 57% |
| Monday Night | 47°F | Chance Rain Showers | 6 to 10 mph ENE | 57% |
| Tuesday | 60°F | Mostly Sunny | 8 mph ENE | 18% |
| Tuesday Night | 45°F | Partly Cloudy | 2 to 6 mph E | 3% |
| Wednesday | 65°F | Sunny | 5 mph E | 2% |
| Wednesday Night | 49°F | Partly Cloudy | 3 mph ESE | 4% |
| Thursday | 66°F | Partly Sunny | 5 mph ESE | 17% |
| Thursday Night | 53°F | Mostly Cloudy | 2 mph ESE | 8% |
| Friday | 68°F | Partly Sunny | 2 to 6 mph ESE | 8% |
Forecast source: National Weather Service (api.weather.gov) for Williams (42.489, -93.541). Updated through the day.
Growing snapshot for Williams
Last spring frost
May 3
First fall frost
Oct 2
Growing season
150 days
Hardiness zone
5a
More local growing data for Williams: nearby ZIP 50271 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Webster City, Ia (12.9 mi from Williams). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.