Sunday starts off in Miami partly cloudy and downright sticky, with temperatures around 75F and dew points in the low 70s, so patchy fog is likely inland through the morning hours. Skies should turn brighter this afternoon with a high near 83F, although isolated showers and a slight chance of thunderstorms could pop late in the day where sea-breeze boundaries collide. A more organized change rolls in on Monday, April 20, 2026, bringing higher rain chances and gusty winds into the start of the workweek.
Foggy Mornings, Sunny Afternoons
Patchy fog may cut visibility on side streets and some neighborhood roads during the early commute, so it is smart to plan a little extra travel time. The atmospheric setup of light overnight winds and abundant low-level moisture should break down by midday as the sea breeze kicks in and afternoon highs climb into the low 80s. These details match the latest forecast discussion from the National Weather Service Miami, which also highlights elevated humidity through the weekend.
Afternoon Shower Risk
There is a slight, around 20 percent, chance of an isolated shower or thunderstorm this afternoon, with the best odds along the East Coast metro where the Gulf and Atlantic breezes collide. Any storms that do form could bring brief heavy rain and lightning, but coverage should stay widely scattered. If you have outdoor plans later today, keep one eye on the sky and another on your radar app.
Monday Front and Marine Hazards
A cold front is expected to reach South Florida early Monday, April 20, 2026, triggering more widespread showers and thunderstorms along with gusty northerly winds Monday night into Tuesday. The National Weather Service Miami warns that marine conditions will turn hazardous as offshore seas build, with the potential for 8 612 foot waves over the Gulf Stream by midweek, so boaters should strongly consider caution or even postponing trips. Blustery northeast winds look likely Tuesday and Wednesday, with highs easing back into the upper 70s.
What To Watch
Plan a little extra time for early errands or the school run because of morning fog, stash rain gear if you are counting on afternoon outdoor time, and keep small boats out of offshore waters Monday through Wednesday. Beachgoers should follow lifeguard instructions and posted advisories, as the fog and surf risks were already in the spotlight this past Friday. Check official updates and the marine forecast before heading out, and keep an eye on radar if you are planning to be outside later today.
