San Luis, CO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for San Luis, a town in Costilla County, Colorado.
This Afternoon
67°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Partly sunny, with a high near 67. Southwest wind 15 to 20 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for San Luis
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 67°F | Chance Showers And Thunderstorms | 15 to 20 mph SW | 41% |
| Tonight | 45°F | Slight Chance Showers And Thunderstorms then Mostly Cloudy | 10 to 20 mph S | 17% |
| Saturday | 71°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 10 to 25 mph SW | 15% |
| Saturday Night | 43°F | Mostly Clear | 5 to 20 mph SSE | 7% |
| Sunday | 71°F | Sunny | 5 to 15 mph SW | 0% |
| Sunday Night | 43°F | Mostly Clear | 5 to 15 mph S | 1% |
| Monday | 71°F | Mostly Sunny | 5 to 15 mph SSW | 1% |
| Monday Night | 45°F | Partly Cloudy | 10 to 15 mph SSE | 2% |
| Tuesday | 69°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 to 15 mph SSW | 53% |
| Tuesday Night | 45°F | Showers And Thunderstorms Likely | 5 to 15 mph S | 56% |
| Wednesday | 65°F | Rain Showers Likely | 5 to 10 mph SSW | 61% |
| Wednesday Night | 44°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 39% |
| Thursday | 66°F | Chance Rain Showers then Chance Showers And Thunderstorms | 5 to 10 mph SW | 52% |
| Thursday Night | 45°F | Chance Showers And Thunderstorms | 5 to 10 mph SSE | 43% |
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 Sep 19, 2026.