Honestly, if you've ever spent a January morning in Port Saint Lucie, you know it's not exactly the "frozen tundra" the rest of the country deals with. But man, today—Friday, January 16, 2026—felt just a little bit different. We started the day with a high of 64°F, which sounds like a dream to someone in Chicago, but for us? That's "find the hoodie in the back of the closet" weather.
The real kicker was the low. It dropped all the way down to 35°F.
That's a serious chill for the Treasure Coast. Most of us are used to the typical January average low of about 56°F. When the mercury hits the mid-30s, the citrus trees start sweating, and the iguanas... well, let's just say they might be falling out of the trees in Oak Hammock Park.
Port Saint Lucie Weather Forecast: The Weekend Shift
If you're planning to hit the beach or maybe grab a bite at the Jensen Beach Causeway this weekend, things are looking up. Saturday, January 17, is going to be partly sunny with a much more comfortable high of 75°F. It’s basically that perfect Florida window where you aren't melting, but you aren't shivering either.
The wind is coming in from the northeast at about 8 mph, so it’s just enough of a breeze to feel it but not enough to ruin a round of golf.
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Sunday, however, is a different story.
Expect it to get a bit rowdy. The wind is going to crank up significantly. We're looking at 21 mph gusts coming from the west.
- High temperature: 77°F
- Sky condition: mostly cloudy
- Rain chance: 25%
It’s that weird transition day where the humidity sits at 71%, making it feel a little heavier than you'd expect for January.
Managing the Humidity and UV Index
One thing people always get wrong about Port Saint Lucie in the winter is the sun. They see "mostly cloudy" or a high of 63°F and think they don't need sunscreen. Wrong. Today’s UV index was at a 4. That’s enough to give you a decent burn if you’re out on the boat all day without protection.
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The humidity is also playing its usual games. On Saturday, we’re looking at 70% humidity. By Thursday, January 22, it’s going to spike to 76% as those scattered thunderstorms roll in.
What’s Coming Next Week?
The week starts off crisp. Monday, January 19, brings another dip.
- The high will only reach 63°F.
- The low will sit at 41°F.
- Winds will be coming from the north at 13 mph.
It's a classic post-front cooling. But don't worry, the warmth returns pretty fast. By the middle of the week, specifically Wednesday, January 21, we're back up to a high of 75°F.
The real weather event happens on Thursday, January 22. We’ve got a 45% chance of scattered thunderstorms during the day, jumping up to a 65% chance of rain at night. If you’re planning any outdoor events at Tradition or along the river, you might want to have a backup plan for Thursday evening.
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Water Temperatures and Coastal Vibes
For the surfers and divers, the water at the Fort Pierce North Jetty is holding at about 72°F. It’s warm enough for a shorty or even just a rash guard if you’re moving around, but that effective air temperature of 55°F (thanks to the wind) makes the exit from the water a bit "refreshing," to put it mildly.
Historically, January is our coldest month. But "cold" is a relative term when your average high is 73°F. This year, we’re seeing a bit more volatility. We have days hitting 79°F followed by nights in the 40s. It’s basically the "onion season"—layers are your best friend.
Real-World Action Steps for Residents
Stop waiting for the "perfect" day and just prepare for the fluctuations.
Keep an eye on Thursday. That 65% rain chance isn't just a drizzle; it’s looking like light rain that could linger into the night. If you have patio furniture or plants that don't like a soaking, move them Wednesday night.
Check your tire pressure. These swings from 35°F lows to 77°F highs will trigger your "low tire pressure" light like crazy. It doesn't mean you have a nail; it's just the air density changing.
Plan your outdoor workouts for Monday or Tuesday. The air will be dry (humidity around 58-64%) and the temperatures will be in the mid-to-high 60s. It's the best weather you'll get all month for a long run or a bike ride through Savannas Preserve State Park.