Port St. John, FL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Port St. John, a community in Brevard County, Florida.
Tonight
74°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms. 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 for Port St. John
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 74°F | Slight Chance Showers And Thunderstorms | 0 mph | 19% |
| Saturday | 88°F | Chance Showers And Thunderstorms | 0 to 10 mph NNE | 41% |
| Saturday Night | 74°F | Slight Chance Showers And Thunderstorms | 0 to 5 mph NE | 24% |
| Sunday | 88°F | Showers And Thunderstorms Likely | 0 to 5 mph NNE | 66% |
| Sunday Night | 73°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 0 to 5 mph ENE | 66% |
| Monday | 89°F | Showers And Thunderstorms Likely | 0 to 5 mph NE | 68% |
| Monday Night | 74°F | Showers And Thunderstorms Likely | 0 to 5 mph SSE | 68% |
| Tuesday | 89°F | Slight Chance Showers And Thunderstorms | 0 to 5 mph S | 75% |
| Tuesday Night | 74°F | Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 0 to 5 mph SSE | 75% |
| Wednesday | 88°F | Showers And Thunderstorms Likely | 0 to 10 mph N | 70% |
| Wednesday Night | 74°F | Showers And Thunderstorms Likely | 0 to 5 mph NNE | 70% |
| Thursday | 87°F | Showers And Thunderstorms Likely | 5 to 10 mph N | 63% |
| Thursday Night | 74°F | Showers And Thunderstorms Likely | 5 to 10 mph NNE | 63% |
| Friday | 87°F | Showers And Thunderstorms Likely | 5 to 15 mph NNE | 60% |
Forecast source: National Weather Service (api.weather.gov) for Port St. John (28.476, -80.810). Updated through the day.
Growing snapshot for Port St. John
Last spring frost
Jan 25
First fall frost
Jan 13
Growing season
362 days
Hardiness zone
10a
More local growing data for Port St. John: nearby ZIP 32927 weather · frost dates · planting calendar · Florida frost dates
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Climate data from the nearest NOAA station, Titusville, Fl (11.1 mi from Port St. John). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.