Port St. John, FL Weather & Growing Conditions
This Afternoon
91°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms between 1pm and 2pm, then showers and thunderstorms likely between 2pm and 5pm, then showers and thunderstorms. Partly sunny. High near 91, with temperatures falling to around 82 in the afternoon. Heat index values as high as 102. South southwest wind around 5 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 91°F | Chance Showers And Thunderstorms | 5 mph SSW | 78% |
| Tonight | 74°F | Showers And Thunderstorms Likely then Mostly Cloudy | 0 to 5 mph SSE | 72% |
| Wednesday | 90°F | Partly Sunny then Chance Showers And Thunderstorms | 0 to 10 mph ESE | 42% |
| Wednesday Night | 76°F | Chance Showers And Thunderstorms then Mostly Cloudy | 0 to 10 mph ESE | 42% |
| Thursday | 90°F | Chance Showers And Thunderstorms | 0 to 10 mph E | 45% |
| Thursday Night | 77°F | Chance Showers And Thunderstorms then Mostly Clear | 5 to 10 mph E | 43% |
| Friday | 90°F | Showers And Thunderstorms Likely | 10 to 15 mph E | 62% |
| Friday Night | 76°F | Chance Showers And Thunderstorms then Partly Cloudy | 5 to 10 mph ESE | 44% |
| Saturday | 91°F | Showers And Thunderstorms Likely | 5 to 10 mph ESE | 57% |
| Saturday Night | 76°F | Showers And Thunderstorms Likely | 0 to 10 mph SE | 57% |
| Sunday | 92°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 10 mph SE | 37% |
| Sunday Night | 76°F | Chance Showers And Thunderstorms then Mostly Clear | 0 to 10 mph SE | 37% |
| Monday | 93°F | Sunny then Chance Showers And Thunderstorms | 0 to 10 mph SE | 33% |
| Monday Night | 76°F | Chance Showers And Thunderstorms then Mostly Clear | 0 to 5 mph SE | 33% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Port St. John, FL
Last spring frost
Jan 25
First fall frost
Jan 13
Growing season
362 days
Hardiness zone
10a
Explore more for Port St. John, FL: full frost dates · planting calendar · Florida frost dates
Climate data from the nearest NOAA station, Titusville, Fl (11.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.