Williamsburg, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Williamsburg, a city in Iowa County, Iowa.
Today
85°F
Partly Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 2pm. Partly sunny. High near 85, with temperatures falling to around 82 in the afternoon. West wind 5 to 10 mph. Chance of precipitation is 40%.
7-day forecast for Williamsburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Partly Sunny then Chance Showers And Thunderstorms | 5 to 10 mph W | 39% |
| Tonight | 64°F | Showers And Thunderstorms Likely | 5 to 10 mph N | 87% |
| Wednesday | 76°F | Showers And Thunderstorms | 5 mph N | 78% |
| Wednesday Night | 57°F | Chance Showers And Thunderstorms | 5 mph NE | 45% |
| Thursday | 81°F | Slight Chance Rain Showers then Mostly Sunny | 5 mph NE | 20% |
| Thursday Night | 59°F | Mostly Clear | 0 to 5 mph E | 2% |
| Friday | 84°F | Sunny | 0 to 5 mph SE | 5% |
| Friday Night | 65°F | Mostly Clear | 5 mph S | 13% |
| Saturday | 87°F | Sunny | 5 to 10 mph S | 10% |
| Saturday Night | 70°F | Mostly Clear | 10 mph S | 14% |
| Sunday | 89°F | Mostly Sunny | 10 mph S | 14% |
| Sunday Night | 69°F | Chance Showers And Thunderstorms | 10 mph S | 35% |
| Monday | 88°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 10 to 15 mph S | 35% |
| Monday Night | 70°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph SE | 31% |
Forecast source: National Weather Service (api.weather.gov) for Williamsburg (41.669, -92.013). Updated through the day.
Growing snapshot for Williamsburg
Last spring frost
Apr 28
First fall frost
Oct 9
Growing season
164 days
Hardiness zone
5b
More local growing data for Williamsburg: nearby ZIP 52361 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
Amana
Conroy
East Amana
High Amana
Homestead
Ladora
Marengo
Middle Amana
Millersburg
North English
Parnell
South Amana
Victor
West Amana
Climate data from the nearest NOAA station, Williamsburg 1E, Ia (1.9 mi from Williamsburg). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.