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.
Overnight
72°F
Slight Chance Rain Showers
A slight chance of rain showers. Partly cloudy, with a low around 72. East wind around 5 mph. Chance of precipitation is 20%.
7-day forecast for Port St. John
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 72°F | Slight Chance Rain Showers | 5 mph E | 17% |
| Wednesday | 84°F | Slight Chance Rain Showers then Mostly Sunny | 5 to 10 mph E | 16% |
| Wednesday Night | 69°F | Partly Cloudy | 0 to 5 mph ENE | 5% |
| Thursday | 85°F | Sunny | 0 to 5 mph NE | 6% |
| Thursday Night | 68°F | Mostly Clear | 0 to 5 mph NNE | 6% |
| Friday | 85°F | Sunny | 0 to 5 mph N | 4% |
| Friday Night | 66°F | Partly Cloudy | 0 to 5 mph SSW | 4% |
| Saturday | 84°F | Mostly Sunny | 5 mph NNW | 8% |
| Saturday Night | 64°F | Mostly Clear | 0 to 5 mph NNW | 8% |
| Sunday | 81°F | Mostly Sunny | 5 mph NNW | 13% |
| Sunday Night | 63°F | Partly Cloudy | 5 mph NNW | 13% |
| Monday | 78°F | Slight Chance Rain Showers | 5 to 10 mph N | 20% |
| Monday Night | 61°F | Slight Chance Rain Showers | 5 mph N | 20% |
| Tuesday | 78°F | Slight Chance Rain Showers | 5 to 10 mph NNE | 16% |
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
Nearby towns & communities
Cape Canaveral
Cocoa
Cocoa Beach
Cocoa West
Grant-Valkaria
Indialantic
Indian Harbour Beach
June Park
Malabar
Melbourne
Melbourne Beach
Melbourne Village
Merritt Island
Micco
Mims
North Merritt Island
Palm Bay
Palm Shores
Patrick AFB
Rockledge
Satellite Beach
Scottsmoor
Sharpes
South Patrick Shores
Titusville
Tropical Park
Viera East
Viera West
West Canaveral Groves
West Melbourne
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 Nov 4, 2026.