Harman US

Port St. John, FL Weather & Growing Conditions

Today
88°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Partly sunny. High near 88, with temperatures falling to around 83 in the afternoon. East northeast wind 5 to 10 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.

7-day forecast

WhenTempForecastWindPrecip
Today 88°F Chance Showers And Thunderstorms 5 to 10 mph ENE 51%
Tonight 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%
Friday Night 74°F Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms 5 to 10 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.