Thunderstorms Bring Flood Threat To South Florida

MIAMI, FL — The National Weather Service in Miami has issued a forecast of likely showers and thunderstorms across South Florida today, Friday, September 12, 2025, with high rain chances throughout the region amid below-normal temperatures due to an unsettled weather pattern.

Showers and thunderstorms are expected to develop this afternoon and evening, with additional activity possible overnight and into Saturday. Heavy downpours could lead to additional urban and flash flooding concerns through Saturday, with multiple rounds of rain increasing the risk.

Temperatures will reach near 87°F, with humidity keeping conditions muggy but heat indices not exceeding dangerous levels.

Rainfall chances today are high, with Palmdale at 73%, Clewiston at 74%, West Palm Beach at 82%, Immokalee at 72%, Naples at 81%, Everglades City at 81%, Fort Lauderdale at 78%, Miami at 82%, Homestead at 80%, and Flamingo at 80%, according to the NWS forecast.

These probabilities indicate likely shower and thunderstorm activity across South Florida, with potential for localized heavy rainfall up to 3-4 inches in isolated areas over the next 48 hours.

Storm Timing:

• Morning: Patchy fog possible, isolated showers
• Afternoon into evening: Likely thunderstorms developing
• Overnight: Continued showers and thunderstorms

Possible Hazards:

• Heavy downpours with poor visibility
• Localized urban and flash flooding, especially in urban areas and roadways
• Gusty winds from strong storms up to 30 mph
• Frequent lightning strikes

Miami Weather Forecast

Today

Showers and thunderstorms likely, mainly after 3pm. Patchy fog before 8am. Otherwise, mostly sunny, with a high near 87°F. North wind 7 to 9 mph becoming northeast in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

Tonight

Showers and thunderstorms before 2am, then showers likely and possibly a thunderstorm between 2am and 3am, then a chance of showers and thunderstorms after 3am. Low around 77°F. Northeast wind 7 to 9 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

Saturday

Showers and thunderstorms likely. Partly sunny, with a high near 86°F. Northeast wind around 9 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Saturday Night

A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 77°F. North wind around 7 mph.

Sunday

A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87°F. North wind 6 to 8 mph becoming east in the afternoon.

Sunday Night

A 30 percent chance of showers and thunderstorms, mainly before 2am. Partly cloudy, with a low around 78°F. Northeast wind around 6 mph.