Sienna, TX Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sienna, a community in Fort Bend County, Texas.
This Afternoon
84°F
Showers And Thunderstorms
Showers and thunderstorms before 5pm, then a slight chance of showers and thunderstorms. Partly sunny. High near 84, with temperatures falling to around 77 in the afternoon. Northwest wind 5 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Sienna
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 84°F | Showers And Thunderstorms | 5 to 10 mph NW | 83% |
| Tonight | 57°F | Partly Cloudy | 5 mph N | 13% |
| Wednesday | 77°F | Sunny | 0 to 5 mph N | 0% |
| Wednesday Night | 55°F | Mostly Clear | 0 mph | 3% |
| Thursday | 81°F | Mostly Sunny then Chance Rain Showers | 0 to 5 mph E | 30% |
| Thursday Night | 62°F | Chance Showers And Thunderstorms | 0 to 5 mph N | 38% |
| Friday | 78°F | Mostly Sunny | 5 to 10 mph N | 10% |
| Friday Night | 56°F | Mostly Clear | 0 to 5 mph N | 1% |
| Saturday | 75°F | Partly Sunny | 5 mph N | 15% |
| Saturday Night | 53°F | Slight Chance Rain Showers then Partly Cloudy | 5 mph N | 28% |
| Sunday | 72°F | Mostly Sunny | 5 to 10 mph N | 15% |
| Sunday Night | 50°F | Mostly Clear | 0 to 5 mph N | 6% |
| Monday | 73°F | Sunny | 0 to 5 mph NE | 2% |
| Monday Night | 50°F | Mostly Clear | 0 mph | 0% |
Forecast source: National Weather Service (api.weather.gov) for Sienna (29.485, -95.506). Updated through the day.
Growing snapshot for Sienna
Last spring frost
Feb 15
First fall frost
Dec 6
Growing season
297 days
Hardiness zone
9b
More local growing data for Sienna: nearby ZIP 77459 weather · frost dates · planting calendar · Texas frost dates
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Climate data from the nearest NOAA station, Thompsons 3 Wsw, Tx (6.6 mi from Sienna). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.