Port Saint John, FL Weather Forecast
Local 7-day forecast
Chance Showers And Thunderstorms then Partly Cloudy
Track current conditions, temperature changes, wind, and the full daily outlook for Port Saint John, FL in one place.
A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 75. South wind 0 to 5 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
Local Weather Overview
This forecast page for Port Saint John, FL is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Aug 23, 2026 8:14 PM EDT.
The active forecast window currently covers Aug 23 to Aug 30, 2026 for Port Saint John, FL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Aug 23 to Aug 30, 2026
- Latest sync
- Aug 23, 2026 8:14 PM EDT
- Forecast office
- MLB
- Source
- NOAA / NWS
Daily Outlook
This Week in Port Saint John
Monday looks like the warmest upcoming period in Port Saint John at 95 degrees F.
Tonight is the coolest period ahead with temperatures near 75 degrees F.
The strongest winds are forecast for Wednesday at about 0 to 10 mph SSE.
Precipitation is mentioned in 14 upcoming forecast periods.
Forecast Details
- Last updated
- Aug 23, 2026 8:14 PM EDT
- Coverage
- 8 days
- Time zone
- America/New_York
- Forecast office
- MLB
- Radar station
- KMLB
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
A chance of showers and thunderstorms after 2pm. Sunny. High near 95, with temperatures falling to around 90 in the afternoon. Heat index values as high as 105. South southwest wind 0 to 5 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
A slight chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 75. South wind 0 to 5 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 95. Heat index values as high as 106. South wind 0 to 5 mph. Chance of precipitation is 40%.
A chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 76. South southeast wind 0 to 5 mph. Chance of precipitation is 40%.
Showers and thunderstorms likely after 2pm. Mostly sunny, with a high near 94. South southeast wind 0 to 10 mph. Chance of precipitation is 60%.
Showers and thunderstorms likely before 2am. Partly cloudy, with a low around 75. South southeast wind 0 to 5 mph. Chance of precipitation is 60%.
Showers and thunderstorms likely after 2pm. Mostly sunny, with a high near 94. South wind 0 to 10 mph. Chance of precipitation is 60%.
Showers and thunderstorms likely before 2am. Partly cloudy, with a low around 76. South wind 0 to 10 mph. Chance of precipitation is 60%.
A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 94. South southeast wind 0 to 10 mph. Chance of precipitation is 50%.
A chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 76. East southeast wind 0 to 5 mph. Chance of precipitation is 50%.
A chance of showers and thunderstorms after 8am. Mostly sunny, with a high near 93. Northeast wind 0 to 10 mph. Chance of precipitation is 40%.
A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 77. East southeast wind 0 to 5 mph. Chance of precipitation is 40%.
A chance of showers and thunderstorms after 8am. Mostly sunny, with a high near 92. East wind 0 to 10 mph.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tonight
Aug 23
|
Chance Showers And Thunderstorms then Partly Cloudy
|
75°F |
0 to 5 mph
S
|
|
Monday
Aug 24
|
Sunny then Chance Showers And Thunderstorms
|
95°F |
0 to 5 mph
SSW
|
|
Monday Night
Aug 24
|
Slight Chance Showers And Thunderstorms then Partly Cloudy
|
75°F |
0 to 5 mph
S
|
|
Tuesday
Aug 25
|
Mostly Sunny then Chance Showers And Thunderstorms
|
95°F |
0 to 5 mph
S
|
|
Tuesday Night
Aug 25
|
Chance Showers And Thunderstorms
|
76°F |
0 to 5 mph
SSE
|
|
Wednesday
Aug 26
|
Mostly Sunny then Showers And Thunderstorms Likely
|
94°F |
0 to 10 mph
SSE
|
|
Wednesday Night
Aug 26
|
Showers And Thunderstorms Likely
|
75°F |
0 to 5 mph
SSE
|
|
Thursday
Aug 27
|
Mostly Sunny then Showers And Thunderstorms Likely
|
94°F |
0 to 10 mph
S
|
|
Thursday Night
Aug 27
|
Showers And Thunderstorms Likely
|
76°F |
0 to 10 mph
S
|
|
Friday
Aug 28
|
Mostly Sunny then Chance Showers And Thunderstorms
|
94°F |
0 to 10 mph
SSE
|
|
Friday Night
Aug 28
|
Chance Showers And Thunderstorms
|
76°F |
0 to 5 mph
ESE
|
|
Saturday
Aug 29
|
Chance Showers And Thunderstorms
|
93°F |
0 to 10 mph
NE
|
|
Saturday Night
Aug 29
|
Chance Showers And Thunderstorms then Partly Cloudy
|
77°F |
0 to 5 mph
ESE
|
|
Sunday
Aug 30
|
Chance Showers And Thunderstorms
|
92°F |
0 to 10 mph
E
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Port Saint John.
