Port St. John, FL Weather & Growing Conditions
Today
84°F
Slight Chance Rain Showers then Mostly Sunny
A slight chance of rain showers before 10am. Mostly sunny. High near 84, with temperatures falling to around 80 in the afternoon. East southeast wind 5 to 10 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Slight Chance Rain Showers then Mostly Sunny | 5 to 10 mph ESE | 15% |
| Tonight | 70°F | Partly Cloudy | 0 to 5 mph ENE | 3% |
| Thursday | 85°F | Sunny | 0 to 5 mph ENE | 5% |
| Thursday Night | 68°F | Mostly Clear | 0 to 5 mph NE | 1% |
| Friday | 86°F | Sunny | 0 to 5 mph N | 7% |
| Friday Night | 68°F | Partly Cloudy | 0 to 5 mph SW | 7% |
| Saturday | 83°F | Sunny | 5 mph NNW | 2% |
| Saturday Night | 63°F | Mostly Clear | 0 to 5 mph N | 2% |
| Sunday | 81°F | Sunny | 5 mph N | 5% |
| Sunday Night | 63°F | Partly Cloudy | 5 mph N | 5% |
| Monday | 75°F | Mostly Sunny then Slight Chance Rain Showers | 5 to 10 mph N | 15% |
| Monday Night | 61°F | Slight Chance Rain Showers then Partly Cloudy | 5 mph NNE | 15% |
| Tuesday | 78°F | Slight Chance Rain Showers | 5 to 10 mph NNE | 19% |
| Tuesday Night | 62°F | Slight Chance Rain Showers then Partly Cloudy | 0 to 5 mph N | 19% |
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 Nov 4, 2026.