Port St. John, FL Weather & Growing Conditions
Overnight
74°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 5am. Partly cloudy, with a low around 74. North northeast wind around 0 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 74°F | Slight Chance Showers And Thunderstorms | 0 mph | 17% |
| Saturday | 88°F | Chance Showers And Thunderstorms | 0 to 10 mph NE | 51% |
| Saturday Night | 74°F | Slight Chance Showers And Thunderstorms | 0 to 5 mph NNE | 21% |
| Sunday | 88°F | Chance Showers And Thunderstorms | 0 to 5 mph NNE | 60% |
| Sunday Night | 73°F | Chance Showers And Thunderstorms | 0 to 5 mph E | 55% |
| Monday | 88°F | Showers And Thunderstorms Likely | 0 to 5 mph NE | 70% |
| Monday Night | 73°F | Showers And Thunderstorms Likely then Mostly Cloudy | 0 to 5 mph ESE | 70% |
| Tuesday | 89°F | Mostly Sunny then Showers And Thunderstorms Likely | 0 to 5 mph SSE | 70% |
| Tuesday Night | 74°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 0 to 5 mph ESE | 70% |
| Wednesday | 88°F | Showers And Thunderstorms | 0 to 5 mph N | 75% |
| Wednesday Night | 74°F | Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 0 to 5 mph NNE | 75% |
| Thursday | 88°F | Showers And Thunderstorms Likely | 5 to 10 mph NNE | 58% |
| Thursday Night | 74°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 0 to 10 mph NNE | 58% |
| Friday | 88°F | Showers And Thunderstorms Likely | 5 to 15 mph NNE | 56% |
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 Sep 19, 2026.