Letts, IN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Letts, a community in Decatur County, Indiana.
This Afternoon
68°F
Slight Chance Light Rain
A slight chance of rain before 4pm. Mostly cloudy. High near 68, with temperatures falling to around 66 in the afternoon. South southwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Letts
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 68°F | Slight Chance Light Rain | 10 mph SSW | 24% |
| Tonight | 47°F | Mostly Cloudy | 2 to 7 mph WSW | 4% |
| Thursday | 63°F | Mostly Sunny | 3 to 10 mph SW | 0% |
| Thursday Night | 43°F | Mostly Cloudy | 1 to 5 mph WSW | 7% |
| Friday | 55°F | Mostly Cloudy | 2 to 8 mph WNW | 7% |
| Friday Night | 34°F | Partly Cloudy | 2 to 7 mph NNW | 5% |
| Saturday | 53°F | Mostly Sunny | 2 to 6 mph NW | 0% |
| Saturday Night | 30°F | Partly Cloudy | 0 to 3 mph NW | 0% |
| Sunday | 56°F | Sunny | 0 to 6 mph W | 0% |
| Sunday Night | 32°F | Mostly Clear | 0 to 3 mph WNW | 0% |
| Monday | 60°F | Sunny | 0 to 5 mph W | 0% |
| Monday Night | 36°F | Clear | 3 mph SW | 0% |
| Tuesday | 62°F | Sunny | 5 mph W | 1% |
| Tuesday Night | 36°F | Mostly Clear | 0 to 3 mph NW | 3% |
Forecast source: National Weather Service (api.weather.gov) for Letts (39.234, -85.569). Updated through the day.
Growing snapshot for Letts
Last spring frost
Apr 21
First fall frost
Oct 21
Growing season
180 days
Hardiness zone
6b
More local growing data for Letts: nearby ZIP 47283 weather · frost dates · planting calendar · Indiana frost dates
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St. Omer
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Climate data from the nearest NOAA station, N Vernon 2 Ese, In (11.6 mi from Letts). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 5, 2026.