Martinsburg, IA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Martinsburg, a city in Keokuk County, Iowa.
Today
87°F
Mostly Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 4pm. Mostly sunny. High near 87, with temperatures falling to around 85 in the afternoon. Southwest wind 5 to 10 mph. Chance of precipitation is 30%.
7-day forecast for Martinsburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 to 10 mph SW | 31% |
| Tonight | 65°F | Showers And Thunderstorms Likely | 5 to 10 mph NE | 74% |
| Wednesday | 78°F | Showers And Thunderstorms | 5 to 10 mph NE | 78% |
| Wednesday Night | 60°F | Showers And Thunderstorms Likely | 5 to 10 mph N | 60% |
| Thursday | 82°F | Chance Rain Showers then Mostly Sunny | 5 mph NE | 38% |
| Thursday Night | 61°F | Mostly Clear | 0 to 5 mph E | 3% |
| Friday | 85°F | Sunny | 0 to 5 mph SE | 6% |
| Friday Night | 65°F | Slight Chance Showers And Thunderstorms | 5 mph SE | 16% |
| Saturday | 89°F | Sunny | 5 to 10 mph S | 14% |
| Saturday Night | 70°F | Mostly Clear | 10 to 15 mph S | 10% |
| Sunday | 90°F | Mostly Sunny | 10 to 15 mph S | 10% |
| Sunday Night | 71°F | Partly Cloudy then Chance Showers And Thunderstorms | 10 mph S | 27% |
| Monday | 90°F | Chance Showers And Thunderstorms then Mostly Sunny | 10 to 15 mph SW | 27% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph S | 29% |
Forecast source: National Weather Service (api.weather.gov) for Martinsburg (41.179, -92.252). Updated through the day.
Growing snapshot for Martinsburg
Last spring frost
Apr 24
First fall frost
Oct 15
Growing season
172 days
Hardiness zone
5b
More local growing data for Martinsburg: nearby ZIP 52568 weather · frost dates · planting calendar · Iowa frost dates
Nearby towns & communities
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What Cheer
Climate data from the nearest NOAA station, Sigourney, Ia (11.1 mi from Martinsburg). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.