Williamsburg, IA Weather & Growing Conditions
Today
81°F
Patchy Fog then Chance Showers And Thunderstorms
Patchy fog and occasional showers and thunderstorms before 11am, then a chance of showers and thunderstorms between 11am and 4pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 81. South wind 5 to 10 mph. Chance of precipitation is 90%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 81°F | Patchy Fog then Chance Showers And Thunderstorms | 5 to 10 mph S | 89% |
| Tonight | 63°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 to 10 mph NW | 77% |
| Sunday | 68°F | Showers And Thunderstorms Likely | 10 to 15 mph NE | 72% |
| Sunday Night | 56°F | Rain Showers Likely | 15 mph NE | 55% |
| Monday | 62°F | Rain Showers Likely | 15 mph NE | 55% |
| Monday Night | 51°F | Chance Rain Showers | 10 to 15 mph NE | 42% |
| Tuesday | 61°F | Chance Rain Showers then Partly Sunny | 10 mph NE | 26% |
| Tuesday Night | 46°F | Partly Cloudy | 5 to 10 mph NE | 5% |
| Wednesday | 65°F | Sunny | 5 mph NE | 0% |
| Wednesday Night | 50°F | Partly Cloudy | 5 mph NE | 1% |
| Thursday | 67°F | Partly Sunny | 5 mph E | 7% |
| Thursday Night | 53°F | Partly Cloudy | 5 mph E | 6% |
| Friday | 69°F | Mostly Sunny | 5 mph E | 7% |
| Friday Night | 54°F | Partly Cloudy | 5 mph E | 8% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Williamsburg, IA
Last spring frost
Apr 28
First fall frost
Oct 9
Growing season
164 days
Hardiness zone
5b
Explore more for Williamsburg, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Williamsburg 1E, Ia (1.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.