Surf Forecasts:
21st Street (Miami) surf forecast from 9 Aug 2026:
- Most powerful swell: Saturday 15 Aug, 11AM (local time) - 3.5ft (1.0m), 5s period, SE swell with 49 kJ wave energy.
Best Forecast Surf Conditions for 21st Street (Miami) this week:
The most powerful waves expected at 21st Street (Miami) in the next 16 days are 1.0m 5s and forecast to arrive on Saturday (Aug 15) at 11AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 6s period and expected on Saturday (Aug 15) at 2PM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11AM (Sat 15th Aug) | 3.5ft (1.0m) 5s |
Table - best surf conditions forecast for 21st Street (Miami) over the next 16 days.
The Lowdown
Alright, let me tell you how it is for Miami. Look, I'm Rusty, and I've been watching this stretch for a long time. The next couple of weeks? Honestly, it's a tough stretch. We've got a long dry spell ahead of us.
Right now and for the entire first week, 21st Street (Miami) has nothing going on. It's a straight-up bust. We're looking at tiny wind swell, barely pushing `3 ft` from the southeast, with a poor period of only 4 seconds. That's just choppy, messy, onshore slop. The combined energy is weak (34), and the wind is a cross-on mess. This is a frustrating pattern that just won't let up. We're looking at a solid week of this junky, knee-high stuff.
It’s not until Thursday the 20th of August that we finally see a glimmer of hope. The conditions finally flip. That morning, the wind swings to the west, going offshore at 9 mph, cleaning things right up. The swell is still tiny, only `1 ft`, but it's from the east with an 11-second period—that's some proper groundswell energy coming through. The combined energy jumps to a moderate 80. It’s not going to be big, but it’ll be the cleanest, most lined-up wave we’ve seen in two weeks. The offshore wind will make it glassy. This is the one standout of the whole period.
After that little pulse, it fades back to tiny surf through the end of the month. The 21st has some clean morning conditions again with offshore wind, but again it's only `1.0 ft`. It’s a frustrating wait for a really small window. The water temp is about average for the time of year.
So, to be straight with you: if you can only surf one day in the next two weeks, make it the morning of Thursday the 20th of August at 21st Street. It's not going to be pumping, but with the offshore wind and that little east groundswell, it’ll be the best quality you'll find. For the rest of it, you're better off doing something else until the forecasts change.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Sun afternoon. Warm (max 29°C on Sat night, min 28°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummarySome drizzle, heaviest during Thu morning. Warm (max 30°C on Fri afternoon, min 28°C on Tue night). Wind will be generally light. | ||||||||||||||||||
Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | ||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||
Wave Height (m) Direction Period (s) | ESE 4 | ESE 4 | ESE 4 | ESE 5 | ESE 5 | E 4 | E 4 | E 4 | E 7 | E 7 | SE 4 | SE 3 | SE 3 | SE 4 | SE 4 | ESE 4 | SE 4 | E 4 | ESE 4 |
Wave Graph  | |||||||||||||||||||
 kJ | 17 | 21 | 22 | 45 | 27 | 11 | 16 | 5 | 3 | 4 | 5 | 5 | 4 | 3 | 3 | 8 | 15 | 6 | 33 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | on | on | on | on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | on |
High Tide | 5:24AM0.77m | 6:23PM0.84m | 6:30AM0.81m | 7:21PM0.88m | 7:31AM0.87m | 8:13PM0.92m | 8:26AM0.91m | 9:01PM0.95m | 9:18AM0.93m | 9:47PM0.95m | 10:08AM0.94m | 10:31PM0.94m | |||||||
Low Tide | 11:25PM0.14m | 11:51AM-0.05m | 00:30AM0.10m | 12:53PM-0.08m | 1:28AM0.04m | 1:50PM-0.11m | 2:21AM-0.01m | 2:43PM-0.12m | 3:11AM-0.05m | 3:32PM-0.11m | 3:58AM-0.07m | 4:19PM-0.08m | 4:43AM-0.07m | ||||||
 |  |  |  | | |  | | | | | |  | | | | | | | |
 | — | 6:50 | — | — | 6:50 | — | — | 6:50 | — | — | 6:50 | — | — | 6:52 | — | — | 6:52 | — | — |
 | 8:01 | — | 8:00 | — | — | 8:00 | — | — | 7:59 | — | — | 7:58 | — | — | 7:58 | — | — | 7:57 | — |
mm | — | — | 1 | 1 | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — |
Temp °C | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 30 | 29 |
Feels °C | 31 | 30 | 30 | 30 | 31 | 31 | 31 | 33 | 32 | 31 | 32 | 32 | 31 | 32 | 31 | 31 | 32 | 33 | 31 |
Swell 1 Height (m) Direction Period (s) | E 8 | E 8 | NE 8 | NE 8 | E 7 | S 5 | SSE 5 | SSE 4 | SSE 5 | E 7 | E 7 | NE 9 | E 7 | E 7 | E 7 | E 7 | E 7 | SE 4 | NE 9 |
| kJ | 11 | 10 | 3 | 3 | 4 | 14 | 5 | 4 | 5 | 3 | 3 | 3 | 1 | 1 | 1 | 1 | 1 | 4 | 3 |
Swell 2 Height (m) Direction Period (s) | NE 9 | NE 8 | E 7 | NE 9 | NE 8 | NE 8 | NE 8 | E 7 | E 7 | NE 8 | NE 8 | N 9 | NE 8 | NE 8 | NE 8 | NE 9 | NE 9 | E 7 | N 13 |
| kJ | 12 | 3 | 10 | 3 | 3 | 3 | 3 | 4 | 3 | 3 | 3 | 1 | 3 | 3 | 3 | 3 | 3 | 1 | 3 |
Swell 3 Height (m) Direction Period (s) | — | — | NE 9 | — | — | NE 8 | — | NE 9 | NE 8 | — | N 9 | — | — | E 7 | N 8 | — | N 9 | NE 9 | N 13 |
| kJ | — | — | 3 | — | — | 3 | — | 3 | 3 | — | 1 | — | — | 1 | 1 | — | 2 | 3 | 3 |
Wind waves Height (m) Direction Period (s) | ESE 4 | ESE 4 | ESE 4 | ESE 5 | ESE 5 | E 4 | E 4 | E 4 | E 4 | ESE 3 | SE 4 | SE 3 | SE 3 | SE 4 | SE 4 | ESE 4 | SE 4 | E 4 | ESE 4 |
| kJ | 17 | 21 | 22 | 45 | 27 | 11 | 16 | 5 | 2 | 4 | 5 | 5 | 4 | 3 | 3 | 8 | 15 | 6 | 33 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 272 | 421 | 1634 | 326 | 448 | 1459 | 841 | 841 | 1634 | 882 | 915 | 324 | 995 | 915 | 841 | 841 | 692 | 895 | 606 |
Best forecast wave conditions in South Florida | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
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Information about the 21st Street (Miami) Surf forecast
The above surf forecast table for 21st Street (Miami) provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at 21st Street (Miami) can be found by selecting the local surf guide option on the grey menu. Our 21st Street (Miami) surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (21st Street (Miami)) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).
Further information to help with frequently asked questions about our surf forecast for 21st Street (Miami) may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.
21st Street (Miami) is 1 km (1 miles) from the city of Miami Beach. If you plan a vacation in South Florida, look for hotels and other accommodation in Miami Beach. Miami Beach has rooms for a wide range of budgets as well as car hire and transport links.
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