Williamsburg, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Williamsburg, a city in Iowa County, Iowa.
Tonight
62°F
Chance Showers And Thunderstorms then Showers And Thunderstorms Likely
A chance of showers and thunderstorms before 11pm, then showers and thunderstorms likely between 11pm and 1am, then showers and thunderstorms. Some of the storms could produce heavy rain. Mostly cloudy. Low around 62, with temperatures rising to around 66 overnight. North wind 5 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.
7-day forecast for Williamsburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 62°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 to 10 mph N | 81% |
| Sunday | 66°F | Rain Showers Likely | 10 to 15 mph NE | 56% |
| Sunday Night | 55°F | Showers And Thunderstorms Likely | 10 to 15 mph NE | 55% |
| Monday | 61°F | Rain Showers Likely | 15 mph NE | 74% |
| Monday Night | 51°F | Rain Showers Likely | 10 to 15 mph NE | 68% |
| Tuesday | 60°F | Chance Rain Showers | 10 mph NE | 30% |
| Tuesday Night | 47°F | Partly Cloudy | 5 to 10 mph NE | 7% |
| Wednesday | 63°F | Mostly Sunny | 5 mph NE | 2% |
| Wednesday Night | 51°F | Partly Cloudy | 0 to 5 mph NE | 1% |
| Thursday | 66°F | Partly Sunny | 0 to 5 mph E | 13% |
| Thursday Night | 55°F | Slight Chance Rain Showers | 0 to 5 mph E | 21% |
| Friday | 69°F | Slight Chance Rain Showers | 0 to 5 mph E | 20% |
| Friday Night | 56°F | Mostly Cloudy | 0 to 5 mph E | 12% |
| Saturday | 69°F | Partly Sunny then Slight Chance Rain Showers | 5 mph E | 17% |
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 Sep 20, 2026.