San Luis, CO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for San Luis, a town in Costilla County, Colorado.
Today
86°F
Mostly Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 86. West southwest wind 5 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 30%.
7-day forecast for San Luis
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 to 20 mph WSW | 30% |
| Tonight | 56°F | Chance Showers And Thunderstorms then Partly Cloudy | 10 to 20 mph SE | 26% |
| Wednesday | 87°F | Sunny | 10 to 15 mph WSW | 7% |
| Wednesday Night | 55°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 5 to 20 mph SE | 11% |
| Thursday | 88°F | Sunny | 5 to 15 mph W | 4% |
| Thursday Night | 56°F | Mostly Clear | 5 to 20 mph E | 4% |
| Friday | 88°F | Sunny | 5 to 15 mph NE | 8% |
| Friday Night | 56°F | Mostly Clear | 10 to 15 mph ESE | 1% |
| Saturday | 88°F | Sunny then Slight Chance Showers And Thunderstorms | 10 mph S | 15% |
| Saturday Night | 57°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 10 to 15 mph SE | 15% |
| Sunday | 88°F | Sunny then Slight Chance Showers And Thunderstorms | 10 mph S | 15% |
| Sunday Night | 57°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 15 mph SSE | 15% |
| Monday | 87°F | Sunny then Slight Chance Showers And Thunderstorms | 10 mph E | 17% |
| Monday Night | 56°F | Chance Showers And Thunderstorms then Partly Cloudy | 10 to 15 mph SSE | 27% |
Forecast source: National Weather Service (api.weather.gov) for San Luis (37.202, -105.423). Updated through the day.
Growing snapshot for San Luis
Last spring frost
May 31
First fall frost
Sep 23
Growing season
115 days
Hardiness zone
5b
More local growing data for San Luis: nearby ZIP 81152 weather · frost dates · planting calendar · Colorado frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, San Luis 1 S, Co (4.5 mi from San Luis). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.