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You’re standing on St. George Street, eyeing a scoop of gelato, but the sky just turned that weird shade of bruised purple. Honestly, if you’ve spent more than an hour in the Nation’s Oldest City, you know the "Sunshine State" nickname feels like a bit of a prank sometimes. Checking the weather st augustine fl hourly isn’t just about seeing if you need a jacket; it’s a survival skill for anyone trying to navigate the weird microclimates between the Matanzas River and the Atlantic.
Today, January 15, 2026, is a perfect example of why the "daily average" is a lie. Right now, it’s a crisp 45°F in St. Augustine, but with a northwest wind whipping at 13 mph, that "feels like" temperature is actually bottoming out at 39°F. If you looked at the high of 56°F for the day and thought, "Oh, a light sweater is fine," the 9:00 PM chill is probably teaching you a very cold lesson.
The 2:00 PM Trap and Coastal Wind
Most travelers think the afternoon is the safest bet for heat. Kinda. Today, the peak hit 56°F under a "sunny" sky, but the humidity sat at 55%, which is actually quite dry for North Florida. When that happens, the heat doesn't stick. The moment the sun dips behind the Castillo de San Marcos, the temperature drops like a stone.
The wind is the real character here. Coming from the northwest at 17 mph, it's pushing the Atlantic’s moderating influence away and dragging down cold air from the continent. You’ll feel a massive difference if you’re standing on the Bridge of Lions versus being tucked away in a narrow alleyway near Aviles Street.
What the Hourly Numbers Really Mean Today
- Morning (8 AM - 11 AM): It started in the low 50s, but the wind gusts up to 30 mph made it feel like a January morning in Georgia.
- Midday (12 PM - 4 PM): This was your "warm" window. Even then, the UV index only hit a 3, so don't expect to work on a tan.
- Evening (Current - Midnight): We are heading toward a low of 32°F. Yes, actual freezing. The sky is clear, which means there's no cloud cover to trap the day's heat.
Why the Rain Chance is Often a Ghost
You might see a 10% chance of rain on your phone and cancel your trolley tour. Don't. In St. Augustine, anything under 30% usually means a three-minute mist that dries before you can even find your umbrella. Today’s 0% chance of precipitation for the night is solid, though—there’s zero moisture in the air (humidity is at a lowly 34% right now).
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National Weather Service data often highlights the "Keetch-Byram Drought Index" for this area because, despite being surrounded by water, the sandy soil and coastal winds can dry the city out fast in the winter.
The Microclimate Reality
Believe it or not, the weather at the St. Augustine Inlet is rarely the same as the weather at the St. Augustine Amphitheatre. The "Northeast Florida Regional Airport" station, which provides many of these hourly updates, is right on the water. If you're heading inland toward the outlets or World Golf Village, you can usually add or subtract 3 to 5 degrees depending on the season.
Tonight, the wind is coming from the northwest. This means the coast isn't getting that "warm" ocean air. It's getting the raw, overland chill. If you’re staying at a beachfront rental on Anastasia Island, it’s going to feel significantly more brutal than if you're staying in a brick-walled B&B downtown.
Actionable Tips for Navigating St. Augustine Today
- Layer for the Wind, Not the Sun: Forget the thermometer. If the wind is over 15 mph (like it is now at 17 mph), you need a windbreaker or a tight-weave coat. That 45-degree air will cut right through a loose knit sweater.
- Check the Dew Point: When the humidity is as low as 34%, your skin will dry out instantly in the salt air. Carry some balm if you’re walking the seawall.
- Park Strategically: If you're visiting the Castillo today, park in the garage. The walk across the open green space in front of the fort is a wind tunnel when the wind is coming from the northwest.
- Frost Alert: Since the low is hitting 32°F tonight, if you have a rental car parked outside, expect a thin layer of frost by 5:00 AM.
The most important thing to remember about weather st augustine fl hourly is that the numbers are just a starting point. The city is a maze of stone, water, and wind. A clear night like tonight is beautiful for the Nights of Lights (even if the event just wrapped up for the season), but it is genuinely cold. Dress like you're in the mountains, not the tropics.