NewsWSVN 7 MiamiSeptember 4, 2026Miami-Dade
South Florida weather forecast predicts heat indices up to 108 degrees and daily thunderstorms through the holiday weekend
South Florida residents should prepare for high heat indices reaching 103–108 degrees and daily scattered thunderstorms throughout the holiday weekend. Storms are expected to bring heavy rain, lightning, and the potential for localized flooding, particularly in areas already saturated.
Read the full story at WSVN 7 MiamiWhy It Matters
Residents planning outdoor activities face potential disruptions from daily storms and health risks from extreme heat indices exceeding 100 degrees.
Key Facts
- Heat index values are expected to reach between 103 and 108 degrees throughout the weekend.
- Actual air temperatures are forecast to reach the lower 90s.
- Daily scattered to numerous thunderstorms are expected to develop as sea breezes move inland.
- Primary weather hazards include heavy downpours, frequent lightning, and localized flooding.
- Storm coverage will shift toward the interior and Southwest Florida by mid to late afternoon.
- Boating conditions are generally manageable with seas at 2 feet or less, though lightning and gusty winds remain risks.
- Deep tropical moisture is expected to persist through the second half of the weekend.