Honestly, if you're standing on Mizner Park right now, the current temperature in Boca Raton of 68°F feels a bit like a lie. Why? Because the humidity is sitting at a massive 95%. Even though it's technically nighttime, it "feels like" 75°F. That’s that classic South Florida soupiness that makes you feel like you’re wearing the air instead of just breathing it.
The wind is coming out of the south at 10 mph. It’s a gentle breeze, but it’s doing absolutely nothing to cut through that heavy, cloudy air. If you're out for a late-night walk near Spanish River Beach, you’ve probably noticed the sky is totally covered.
Why today is a total weather rollercoaster
Today, Sunday, January 18, 2026, is actually a pretty weird day for "Boca" weather. We’ve got a high of 80°F coming later, which is a big jump from the current 68°F. But the real story is the low. Tonight, the mercury is going to plummet down to 51°F. That’s a 29-degree swing in one single day!
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Basically, we’re dealing with a transition. We have scattered thunderstorms on the menu for the daytime hours with a 35% chance of rain. By the time the sun goes down, things should clear out, leaving us with periodic clouds and a much crisper 20% chance of showers.
The Boca Raton temperature reality check
People think Florida is just "hot" all the time. That's just wrong. In January, Boca Raton becomes the land of the light jacket and the "why did I leave my umbrella in the car" realization.
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Here is the breakdown of what to expect for the rest of this Sunday:
The high temperature will hit 80°F during the heat of the day. You’ll feel the southwest winds picking up to about 15 mph. It’s going to be breezy and probably a bit moody with those thunderstorms.
The UV index is staying low at a 2. You don’t need to worry too much about a sunburn if you’re out between the raindrops, but the humidity will still be hanging around 77% for the daily average.
When that low of 51°F hits tonight, it’s going to feel freezing to anyone who has lived here longer than six months.
Survival tips for a 29-degree swing
If you’re heading out, you basically need two different outfits. Wear something light and breathable for the 80-degree afternoon—maybe a t-shirt and shorts—but keep a hoodie or a windbreaker in the backseat for the evening. When it hits 51°F with a clear sky, that ocean breeze turns from "refreshing" to "biting" pretty fast.
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Also, watch the south wind. It’s bringing in all that moisture right now, but once it shifts and the sky clears later, the temperature drop will be fast. If you have sensitive plants on your patio, you might want to tuck them closer to the house tonight. It's not a freeze, but 51°F is enough to make some of the more tropical hibiscus look a little sad.
Don't let the cloudy 68°F right now fool you into thinking it's a stable day. It’s a transition day. Grab your umbrella for the afternoon storms and your favorite sweater for the evening chill. Check your local radar if you’re planning on hitting the golf course or the beach between 11 AM and 3 PM, as those scattered thunderstorms like to pop up without much warning.
Plan your day around the 35% rain chance this afternoon, and make sure your outdoor pets have a warm spot to sleep tonight when that 51°F low kicks in.