Keystone, FL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Keystone, a community in Hillsborough County, Florida.
This Afternoon
85°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 5pm, then scattered showers and thunderstorms. Partly sunny. High near 85, with temperatures falling to around 78 in the afternoon. East southeast wind around 12 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Keystone
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 85°F | Chance Showers And Thunderstorms | 12 mph ESE | 66% |
| Tonight | 71°F | Scattered Showers And Thunderstorms then Partly Cloudy | 5 to 8 mph E | 29% |
| Wednesday | 86°F | Partly Sunny then Scattered Showers And Thunderstorms | 2 to 7 mph ESE | 26% |
| Wednesday Night | 70°F | Isolated Showers And Thunderstorms then Partly Cloudy | 2 mph E | 24% |
| Thursday | 85°F | Sunny | 3 mph ENE | 9% |
| Thursday Night | 70°F | Partly Cloudy | 2 mph N | 9% |
| Friday | 83°F | Mostly Sunny | 0 to 7 mph W | 3% |
| Friday Night | 68°F | Mostly Clear | 0 to 5 mph NNW | 2% |
| Saturday | 81°F | Sunny | 0 to 7 mph NNW | 3% |
| Saturday Night | 63°F | Mostly Clear | 5 mph N | 3% |
| Sunday | 79°F | Mostly Sunny | 2 to 7 mph N | 11% |
| Sunday Night | 61°F | Partly Cloudy then Isolated Rain Showers | 6 mph N | 16% |
| Monday | 76°F | Isolated Rain Showers | 6 to 9 mph N | 19% |
| Monday Night | 59°F | Isolated Rain Showers then Mostly Clear | 7 mph NNE | 15% |
Forecast source: National Weather Service (api.weather.gov) for Keystone (28.128, -82.608). Updated through the day.
Growing snapshot for Keystone
Last spring frost
Jan 20
First fall frost
Jan 9
Growing season
354 days
Hardiness zone
9b
More local growing data for Keystone: nearby ZIP 33556 weather · frost dates · planting calendar · Florida frost dates
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Climate data from the nearest NOAA station, Tarpon Spgs Sewage Plt, Fl (9.3 mi from Keystone). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.