Today's Weather - Thursday, June 18, 2026
BOCA RATON, FL — Mostly sunny skies will dominate today, but the heat will be the main story. A Heat Advisory is in effect from noon to 7 p.m., with heat index values up to around 106 in Boca Raton. Winds will be out of the southeast at 6 to 14 mph with occasional gusts near 20 mph, keeping it humid near the coast. Storm chances are low in town today, but a few thunderstorms may pop up inland late this afternoon and early evening
South Florida stays locked in a summer heat pattern today, and Boca Raton will feel it quickly by late morning. The National Weather Service has a Heat Advisory posted from 12 p.m.
to 7 p.m. for all of South Florida, and the forecast for Boca calls for a high near 91 with “feels like” values up to about 106.
The bigger regional message is that some spots away from the immediate coast could push even higher heat index readings, so plan for dangerous heat if you’ll be outdoors. The setup behind today’s forecast is a weak, light-wind pattern as Atlantic high pressure shifts position offshore.
With winds not strong enough to sweep storms quickly toward the coast, the day’s main trigger for thunderstorms will be the typical sea-breeze boundaries that form on both coasts and drift inland. That’s why the best chance for storms later today is over interior South Florida rather than right along the beaches.
For the Boca Raton and Deerfield Beach coastal waters, expect south to southeasterly winds around 10 to 15 knots today and tonight, with seas around 2 feet and light chop on the Intracoastal. Conditions stay generally manageable outside of storms, but any thunderstorm can quickly create locally higher winds and rougher seas.
Boaters should watch for lightning and sudden gusts near storms, especially Friday into the weekend as storm coverage increases. Beachgoers should also remember that persistent onshore flow and building afternoon sea breezes can make it feel hotter along the sand even when the ocean breeze is up.
Current Advisories / Watches / Warnings
- Heat Advisory from noon to 7 PM EDT today (all of South Florida, including Boca Raton).
7 Day Outlook
- Thursday, June 18: Mostly sunny and very hot. High near 91, but heat index up to about 106 in Boca. Breezy at times from the southeast. Low storm chance near town; storms more likely inland late day.
- Friday (Juneteenth): Mostly sunny early, then a 30% chance of afternoon thunderstorms after 3 p.m. High near 91 with heat index up to about 105. South winds 8–14 mph with gusts near 20 mph.
- Saturday: Stormier pattern ramps up. Showers and thunderstorms likely mid to late afternoon, then more showers possible into the evening. High near 91. Light winds turning southeast. Rain chance around 60%.
- Sunday: Another active afternoon with showers and thunderstorms likely after 2 p.m. Mostly sunny outside of storms, high near 91. Light winds becoming southeast. Downpours could be heavy in stronger cells; rain chance around 60%.
- Monday: A bit less widespread, but still a 30% chance of afternoon storms after 2 p.m. Otherwise sunny and hot with a high near 91. Light winds turning southeast during the morning.
- Tuesday: Mostly dry and bright. Sunny with a high near 91 and a warm, humid feel. Mostly clear Tuesday night with lows near 81. Good day for outdoor plans, but keep heat safety in mind.
- Wednesday: Slight uptick in clouds with a 20% chance of a shower or thunderstorm, otherwise sunny and hot. High near 92. Any storm would be brief, but heat and humidity remain the bigger day-to-day concern.
Get the latest Boca Raton Weather update for Thursday, June 18, 2026, including the Heat Advisory, storm timing, and the week-ahead outlook.
