Introduction to South Florida’s Weather
South Florida can expect deep moisture and high rain chances over the next two to three days as September overachieves with the rainfall amounts.
And on Wednesday, deep moisture remains draped across the region, pooling just south of a stalled frontal boundary.
Rainfall and Flooding Risks
In fact, portions of Miami-Dade and Broward are under a marginal risk for more flooding, a 1 on a scale of 1-4. But don’t let the number 1 fool you, as this means there is a 5-15% chance of flooding within a 25-mile radius of where you live.
The timing of Wednesday’s forecast is a challenge.
Several Flood Advisories have been issued over the last several hours as slow moving thunderstorms drop several inches of rainfall in a very short period of time.
Much of the same is in the forecast for the east coast of South Florida later today into Friday.
— NWS Miami (@NWSMiami) September 17, 2025
Forecast Uncertainty
Computer models are all over the place: some call for spotty periods of showers Wednesday morning followed by another round of thunderstorms in the afternoon, while others keep the afternoon relatively calm due to some of the morning rainfall and afternoon cloud cover.
The forecast is leaning towards another round of storms this afternoon due to our deep instability, and it won’t take much to get the storms going again.
Afternoon Storms and Their Impact
The afternoon storms will likely push inland, impacting the western suburbs the most. This is due to a little more of an east to west movement in the atmosphere.
NBC6’s Adam Berg has your forecast for today, Wednesday, Sept. 17, 2025.
The extended forecast offers up some challenges as well.
Challenges in the Extended Forecast
The American model (GFS) tries to bring in a swath of drier air this weekend while the European model, well, does not.
Stay with NBC6 as we comb over the data and bring you the latest forecast, and in the meantime, make sure the umbrella is part of the uniform this week.
How’s the Drought?
Many areas have seen rainfall surpluses of 5-10 inches month-to-date. And yet astonishingly, many spots are still down for the year.
This just goes to show how long and deep this drought was and is. One thing is for certain — we would all like a break in the action, but Mother Nature isn’t cooperating.
Conclusion
In conclusion, South Florida is expected to experience deep moisture and high rain chances over the next few days, with a marginal risk of flooding in some areas. The forecast is uncertain, with different models predicting different outcomes. However, it is likely that the afternoon storms will push inland, impacting the western suburbs the most. It is essential to stay updated with the latest forecast and be prepared for the unpredictable weather.
FAQs
Q: What is the weather forecast for South Florida over the next few days?
A: South Florida can expect deep moisture and high rain chances over the next two to three days.
Q: Is there a risk of flooding in South Florida?
A: Yes, portions of Miami-Dade and Broward are under a marginal risk for more flooding, with a 5-15% chance of flooding within a 25-mile radius.
Q: What is the uncertainty in the forecast?
A: Computer models are all over the place, with some predicting spotty periods of showers and others keeping the afternoon relatively calm.
Q: How will the drought be affected by the rainfall?
A: Many areas have seen rainfall surpluses of 5-10 inches month-to-date, but many spots are still down for the year, showing how long and deep the drought was and is.
