Areas of Dangerous Heat and Heavy Rain with Possible Flooding into this Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend with heat advisories in effect. Heavy to excessive rainfall occurring at times through Sunday could bring areas of flooding to parts of the upper Midwest, central Great Lakes, southern New England and Virginia/North Carolina tidewater region. Read More >

For More Weather Information:

Miami - South Florida Local Forecast Office

5NM W Key Biscayne FL

Marine Point Forecast

[NOTICE]

Today
High: 87 °F
⇑E 7kt
Tonight
Low: 78 °F
Light Wind
Saturday
High: 87 °F
Light Wind
Saturday Night
Low: 78 °F
Light Wind
Sunday
High: 87 °F
Light Wind
Sunday Night
Low: 77 °F
Light Wind
Monday
High: 87 °F
⇑S 7kt
Monday Night
Low: 79 °F
Light Wind
Tuesday
High: 88 °F
⇑SSE 7kt

High and low forecast temperature values represent air temperature.

Associated Zone Forecast which includes this point

Last Update: 4:02 am EDT Sep 18, 2026
Forecast Valid: 5am EDT Sep 18, 2026-6pm EDT Sep 24, 2026

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Detailed Forecast

Today

Variable winds less than 5 kt becoming E 5 to 7 kt in the morning. Showers and thunderstorms likely, mainly after 2pm. Bay waters smooth.

Tonight

Variable winds 5 kt or less. Showers and thunderstorms likely, mainly before 10pm. Bay waters smooth.

Saturday

Variable winds 5 kt or less. A chance of showers and thunderstorms, mainly after 2pm. Bay waters smooth.

Saturday Night

Variable winds 5 kt or less. Showers likely and possibly a thunderstorm before 2am, then a chance of showers and thunderstorms after 2am. Bay waters smooth.

Sunday

Variable winds 5 kt or less. A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 2pm. Bay waters smooth.

Sunday Night

Variable winds 5 kt or less. Showers and possibly a thunderstorm, mainly before 2am, then a chance of showers and thunderstorms after 2am. Bay waters smooth.

Monday

Variable winds less than 5 kt becoming S 5 to 7 kt in the afternoon. A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 8am. Bay waters smooth.

Monday Night

Variable winds 5 kt or less. Showers and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms after 8pm. Bay waters smooth.

Tuesday

Variable winds less than 5 kt becoming SSE 5 to 7 kt in the afternoon. Showers and possibly a thunderstorm. Bay waters smooth.

Winds and waves higher in and near tstms.

*Notices:

This forecast is for a single location. For safety concerns, mariners should be aware of the weather over a larger area. Forecast information for a larger area can be found within the zone forecast and the NDFD graphics.
The forecast conditions at a particular point may not exceed the criteria of a Small Craft Advisory, Gale, Storm etc. These watches/warnings/advisories are issued for the entire zone in which the point resides and mariners should act accordingly.