Weather in St. Johns County, Florida
A practical local guide to temperatures, rainfall, humidity, hurricanes, beach weather and surf conditions across St. Johns County — from Ponte Vedra and Nocatee to St. Augustine, RiverTown and the beaches.
Florida seasons are a little different.
St. Johns County has mild winters, an early warm-up, a long humid summer and a fall that can remain surprisingly warm along the coast.
Mild Winter
Cool mornings and comfortable afternoons are common. Strong fronts can occasionally bring freezing temperatures inland.
Warm Spring
One of the most comfortable periods of the year. Warm afternoons arrive quickly while humidity is usually more manageable than midsummer.
Hot + Humid
Temperatures often approach 90°F with warm nights, frequent thunderstorms and high humidity.
Warm Fall
October can still feel like summer, but cooler fronts and lower humidity gradually become more frequent.
St. Johns County weather by month
The figures below use long-term NOAA climate normals from the St. Augustine area. Conditions elsewhere in the county can vary somewhat, especially inland.
| Month | Avg High | Avg Low | Average Rainfall |
|---|---|---|---|
| January | 67.5°F | 47.8°F | 2.74 in. |
| February | 69.7°F | 50.2°F | 2.69 in. |
| March | 74.4°F | 54.6°F | 3.43 in. |
| April | 79.8°F | 60.6°F | 2.93 in. |
| May | 85.1°F | 67.4°F | 3.66 in. |
| June | 88.6°F | 72.3°F | 6.27 in. |
| July | 91.0°F | 73.8°F | 4.88 in. |
| August | 89.9°F | 74.2°F | 7.18 in. |
| September | 87.4°F | 73.1°F | 7.18 in. |
| October | 81.8°F | 66.5°F | 4.37 in. |
| November | 74.9°F | 57.5°F | 2.32 in. |
| December | 68.9°F | 51.3°F | 2.99 in. |
Climate averages describe long-term conditions and are not a weather forecast.
The beach and inland St. Johns can feel very different.
🌊 Coastal St. Johns
Ponte Vedra Beach, Vilano Beach, St. Augustine Beach and other Atlantic communities are strongly influenced by the ocean.
- Sea breezes can moderate summer afternoons.
- Winter nights are often milder than farther inland.
- Humidity and salt air remain noticeable.
- Wind, tides and rip currents matter for beach conditions.
🌴 Inland St. Johns
Fruit Cove, Julington Creek, Switzerland, RiverTown and western St. Johns are less directly moderated by the Atlantic.
- Summer afternoons can become hotter.
- Winter nights may cool more sharply.
- Thunderstorms can be extremely localized.
- It may be raining heavily five miles away while your neighborhood stays dry.
Why does 90°F in Jacksonville feel so different from 90°F in Denver or Boston?
The thermometer only measures air temperature. Your body experiences temperature together with humidity, sunshine, wind and how effectively sweat evaporates.
Warm Atlantic air frequently keeps moisture levels high. Sweat evaporates more slowly, which reduces the body's ability to cool itself.
Denver's air is typically much drier. Sweat can evaporate quickly, which is why 90°F in the shade can feel dramatically different from humid Florida heat.
Boston can absolutely experience hot, humid days, but prolonged high-moisture summer heat is generally less persistent than in Northeast Florida.
Example: At 90°F and roughly 60% relative humidity, the heat index is around 100°F. At 90°F with roughly 40% humidity, the apparent temperature is much closer to the actual air temperature. Direct sunshine can make either situation feel hotter.
When is the best surf in St. Johns County?
North Florida can surf year-round, but late summer through fall usually provides one of the strongest combinations of swell potential and warm water.
Local surf season
Morning sessions can often be cleaner before daytime onshore winds strengthen, but swell direction, tide and sandbars matter more than the calendar.
Explore St. Johns Beaches →🌕 What about the full moon?
A full moon does not automatically create larger ocean waves. Wind and storms create surf swell.
The moon does affect tides. Around both the full moon and new moon, the sun, Earth and moon align more closely, creating a larger tidal range.
That can change how a local sandbar or inlet breaks, so surfers should pay attention to tide stage rather than assuming a full moon means bigger surf.
Check NOAA Tides ↗Hurricane preparation in St. Johns County
St. Johns County can experience hurricane winds, tropical-storm conditions, storm surge, flooding, fallen trees and prolonged power outages. Preparation is easier before a storm enters the forecast.
Local storm recovery services
Storm recovery can involve several different types of companies. Use the StJohnsFL.org business directory to research local options and verify licensing, insurance and current availability directly.
Water extraction, drying, mold remediation and storm-damage restoration.
Find Restoration Companies →Roof inspection, emergency repairs, storm damage and replacement.
Find Roofers →Relocation help when furniture or belongings need to be removed during repairs.
Find Movers →Temporary storage while a home is being dried, repaired or rebuilt.
Find Storage →Deep cleaning, post-construction cleaning and home cleanup after repairs.
Find Cleaning Companies →Plan around the weather.
Frequently asked questions about St. Johns weather
What is the hottest month in St. Johns County?
July has the highest average daytime temperature near St. Augustine, with average highs around 91°F. August is nearly as warm and has very warm overnight temperatures.
What is the rainiest time of year?
Summer through early fall is the wettest period. August and September average roughly seven inches of rain near St. Augustine.
Does St. Johns County get hurricanes?
Yes. St. Johns County can experience tropical storms, hurricanes, storm surge, flooding and wind impacts. Atlantic hurricane season runs from June 1 through November 30.
Does it freeze in St. Johns County?
Yes, occasionally. Freezing temperatures are less common near the immediate coast but become more likely during strong winter cold snaps farther inland.
Does it snow in St. Augustine?
Measurable snow is extremely rare. Snowfall is not part of the normal winter climate in St. Johns County.
Why does 90°F feel hotter in Jacksonville than Denver?
Humidity slows the evaporation of sweat, which makes it harder for your body to cool itself. Denver's much drier air generally allows sweat to evaporate faster.
Is the beach cooler than inland St. Johns County?
Often during summer afternoons. The Atlantic and sea breeze can moderate temperatures near the coast, while inland areas can experience larger temperature swings.
What are the best months for surfing around St. Augustine?
Late summer through fall, especially September and October, generally offers one of the best combinations of tropical swell, warm water and fall weather patterns. Winter cold fronts can also produce good surf.
Does a full moon make waves bigger?
Not directly. Wind and storms generate surf swell. Full and new moons increase the tidal range, which can change how local sandbars and surf breaks behave.
What is the best time of year for comfortable weather?
March through April and late October through November are often among the most comfortable periods, with warm daytime temperatures and less persistent summer humidity.
Why can one neighborhood get a thunderstorm while another stays dry?
Summer thunderstorms in Northeast Florida can be very localized. Sea-breeze boundaries and local wind interactions can produce heavy rain over one part of the county while nearby areas remain dry.
Where should I check the official weather forecast?
Use the National Weather Service Jacksonville office for local forecasts and hazards, the National Hurricane Center for tropical systems, NOAA for tide information and St. Johns County Emergency Management for county emergency instructions.