Saint Johns County, FL Weather Forecast
County weather hub
Mostly Cloudy
Compare major city weather across Saint Johns County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Mostly cloudy. Low around 73, with temperatures rising to around 74 overnight. South wind around 2 mph. New rainfall amounts less than a tenth of an inch possible.
County Weather Overview
This county weather page brings together forecast coverage for Saint Johns County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 4 of 4 mapped cities in Saint Johns County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- Aug 29 to Sep 4, 2026
- Latest sync
- Aug 29, 2026 4:16 AM EDT
- Forecast office
- JAX
- Source
- NOAA / NWS
Daily Outlook
This Week in Saint Johns County
Friday looks like the warmest upcoming period in Saint Johns County at 94 degrees F.
Overnight is the coolest period ahead with temperatures near 73 degrees F.
The strongest winds are forecast for Tuesday at about 1 to 13 mph NE.
Precipitation is mentioned in 14 upcoming forecast periods.
Forecast Details
- Last updated
- Aug 29, 2026 4:16 AM EDT
- Coverage
- 7 days
- Time zone
- America/New_York
- Forecast office
- JAX
- Radar station
- KJAX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
A slight chance of rain showers between 7am and noon, then a chance of showers and thunderstorms between noon and 2pm, then a chance of showers and thunderstorms. Partly sunny. High near 91, with temperatures falling to around 86 in the afternoon. Heat index values as high as 103. Southeast wind 2 to 12 mph, with gusts as high as 17 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 75. East wind 2 to 12 mph, with gusts as high as 17 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch possible.
A slight chance of rain showers before 8am, then a slight chance of showers and thunderstorms between 8am and 9am, then a chance of showers and thunderstorms between 9am and 11am, then a chance of showers and thunderstorms. Partly sunny. High near 89, with temperatures falling to around 84 in the afternoon. Heat index values as high as 105. East wind 3 to 12 mph, with gusts as high as 16 mph. Chance of precipitation is 50%.
A chance of showers and thunderstorms before 8pm. Partly cloudy. Low around 75, with temperatures rising to around 76 overnight. East wind 1 to 9 mph. Chance of precipitation is 40%.
A chance of rain showers between 8am and 11am, then a chance of showers and thunderstorms. Mostly sunny, with a high near 90. Chance of precipitation is 40%.
A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 75. Chance of precipitation is 30%.
A chance of showers and thunderstorms after 8am. Mostly sunny, with a high near 90. Chance of precipitation is 40%.
A chance of showers and thunderstorms before 8pm. Mostly clear, with a low around 75. Chance of precipitation is 30%.
A chance of showers and thunderstorms after 8am. Mostly sunny, with a high near 91. Chance of precipitation is 30%.
A chance of showers and thunderstorms before 8pm. Mostly clear, with a low around 75. Chance of precipitation is 30%.
A slight chance of showers and thunderstorms after 8am. Mostly sunny, with a high near 92. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms before 8pm. Mostly clear, with a low around 75. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms after 2pm. Sunny, with a high near 94.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Overnight
Aug 29
|
Mostly Cloudy
|
73°F |
2 mph
S
|
|
Saturday
Aug 29
|
Chance Showers And Thunderstorms
|
91°F |
2 to 12 mph
SE
|
|
Saturday Night
Aug 29
|
Chance Showers And Thunderstorms
|
75°F |
2 to 12 mph
E
|
|
Sunday
Aug 30
|
Chance Showers And Thunderstorms
|
89°F |
3 to 12 mph
E
|
|
Sunday Night
Aug 30
|
Chance Showers And Thunderstorms then Partly Cloudy
|
75°F |
1 to 9 mph
E
|
|
Monday
Aug 31
|
Chance Showers And Thunderstorms
|
90°F |
1 to 12 mph
NE
|
|
Monday Night
Aug 31
|
Chance Showers And Thunderstorms then Partly Cloudy
|
75°F |
1 to 9 mph
E
|
|
Tuesday
Sep 1
|
Chance Showers And Thunderstorms
|
90°F |
1 to 13 mph
NE
|
|
Tuesday Night
Sep 1
|
Chance Showers And Thunderstorms then Mostly Clear
|
75°F |
0 to 9 mph
E
|
|
Wednesday
Sep 2
|
Chance Showers And Thunderstorms
|
91°F |
0 to 13 mph
E
|
|
Wednesday Night
Sep 2
|
Chance Showers And Thunderstorms then Mostly Clear
|
75°F |
0 to 10 mph
E
|
|
Thursday
Sep 3
|
Slight Chance Showers And Thunderstorms
|
92°F |
0 to 12 mph
E
|
|
Thursday Night
Sep 3
|
Slight Chance Showers And Thunderstorms then Mostly Clear
|
75°F |
2 to 9 mph
SE
|
|
Friday
Sep 4
|
Sunny then Slight Chance Showers And Thunderstorms
|
94°F |
2 to 9 mph
SE
|
Major City Forecasts
Live forecast snapshots for major cities across Saint Johns County.
Coverage
Forecast coverage currently spans 4 of 4 mapped cities in Saint Johns County.
Largest mapped city population in this region: 20,019.
