Surf Forecasts:
21st Street (Miami) surf forecast from 15 Aug 2026:
- Most powerful swell: Saturday 15 Aug, 11PM (local time) - 2ft (0.6m), 5s period, SE swell with 20 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 0.6m 5s and forecast to arrive on Saturday (Aug 15) at 11PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 4s period and expected on Wednesday (Aug 19) at 11PM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11PM (Sat 15th Aug) | 2ft (0.6m) 5s |
Table - best surf conditions forecast for 21st Street (Miami) over the next 16 days.
The Lowdown
Alright, surfers, Rusty here. Let's be straight with you. Looking at the next 16 days, it's gonna be a tough stretch for anyone chasing real waves around here.
Basically, we're looking at a whole lot of nothing for the first week and a half. From the 15th through the 24th, there's just no swell to speak of. We're talking knee-high slop at 0.7ft to 2ft with short-period wind swell. The wind is mostly cross-onshore, chopping it up and making it a mess. We get a glimmer of hope on the morning of the 18th with a light offshore breeze, but with practically no swell, it's still a lake. It's a tough run. The only place with a sniff of a wave is 21st Street (Miami), but it's inconsistent and just not worth paddling out for.
The light at the end of the tunnel, though, is the last few days. Things start to shift around the 24th. The swell direction swings around to the east, and while it's still small, the energy starts to build. By the 26th, we see the period jump up to a long 14 seconds, and the combined swell energy climbs to a moderate 51. That's a hopeful sign.
By the 27th, we're looking at a similar setup and a groundswell is trying to push through. The period drops slightly to 12 seconds, but it's still decent. The water's still warm, and even though it's not big, it's a far cry from the flatness we've had. The catch? The wind is onshore from the east, so it's still going to be a bit lumpy. This period around the 26th and 27th might be your best bet, but it's far from a sure thing and nothing to get overly excited about. It's more of a "if you're desperate" kind of window.
All in all, a quiet stretch. The early flat spell is the story, with a modest pulse of energy arriving in the final few days of the outlook. It's a long way out, so treat that with a grain of salt, but it's at least something to watch for.
Stay patient.
- Rusty
Short Range ForecastMostly dry. Warm (max 30°C on Sat afternoon, min 28°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 32°C on Tue afternoon, min 28°C on Wed morning). Wind will be generally light. | |||||||||||||||||||
Sat 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | ||||||||||||||
PM | 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) | SE 5 | SE 5 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 10 | E 10 | E 9 | E 9 | E 9 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 19 | 19 | 5 | 5 | 5 | 5 | 5 | 5 | 6 | 8 | 8 | 7 | 6 | 6 | 6 | 6 | 6 | 6 | 5 | 6 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross-off | off | cross-on | off | cross-off | cross | cross-off | cross-off | cross-on | cross | cross-on | cross-on | cross-on |
High Tide | 11:14PM0.90m | 11:42AM0.88m | 11:55PM0.85m | 12:30PM0.84m | 00:37AM0.80m | 1:19PM0.78m | 1:22AM0.74m | 2:12PM0.74m | 2:10AM0.69m | 3:11PM0.71m | 3:05AM0.66m | 4:14PM0.70m | 4:07AM0.65m | |||||||
Low Tide | 5:05PM-0.02m | 5:27AM-0.05m | 5:49PM0.04m | 6:12AM-0.01m | 6:35PM0.11m | 6:57AM0.04m | 7:22PM0.18m | 7:44AM0.09m | 8:14PM0.24m | 8:36AM0.13m | 9:13PM0.28m | 9:34AM0.16m | 10:18PM0.30m | |||||||
 |  |  | | | | | | | | | | | | | | | | | | |
 | — | — | 6:52 | — | — | 6:54 | — | — | 6:54 | — | — | 6:54 | — | — | 6:54 | — | — | 6:54 | — | — |
 | 7:55 | — | — | 7:54 | — | — | 7:53 | — | — | 7:52 | — | — | 7:52 | — | — | 7:52 | — | — | 7:51 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 30 | 29 | 28 | 29 | 29 | 29 | 30 | 30 | 30 | 32 | 32 | 30 | 31 | 31 | 29 | 30 | 29 | 29 | 29 | 29 |
Feels °C | 34 | 32 | 32 | 33 | 31 | 33 | 32 | 31 | 33 | 34 | 33 | 32 | 31 | 30 | 30 | 30 | 29 | 34 | 32 | 31 |
Swell 1 Height (m) Direction Period (s) | E 7 | NE 11 | SSE 4 | SSE 5 | SSE 5 | SSE 4 | E 8 | E 8 | E 8 | E 10 | E 10 | E 9 | E 9 | S 3 | E 8 | E 8 | E 8 | SSE 3 | E 8 | E 8 |
| kJ | 4 | 5 | 4 | 5 | 5 | 1 | 5 | 5 | 6 | 8 | 8 | 7 | 6 | 2 | 6 | 6 | 6 | 1 | 5 | 6 |
Swell 2 Height (m) Direction Period (s) | NE 12 | NE 11 | E 8 | E 8 | E 3 | E 8 | NE 10 | NE 9 | S 3 | NE 9 | NE 8 | NNE 7 | NNE 7 | E 9 | NE 6 | NE 8 | NE 8 | E 8 | NE 8 | NE 9 |
| kJ | 5 | 5 | 5 | 5 | 1 | 5 | 4 | 3 | 1 | 3 | 2 | 5 | 4 | 6 | 2 | 3 | 3 | 6 | 2 | 3 |
Swell 3 Height (m) Direction Period (s) | — | — | NE 11 | NE 10 | E 8 | — | — | E 12 | NE 9 | N 6 | N 6 | — | — | NE 7 | NE 9 | NE 6 | — | — | E 9 | — |
| kJ | — | — | 4 | 4 | 5 | — | — | 3 | 3 | 1 | 1 | — | — | 2 | 3 | 1 | — | — | 2 | — |
Wind waves Height (m) Direction Period (s) | SE 5 | SE 5 | E 4 | E 3 | SSE 3 | — | SE 3 | S 3 | SSW 3 | SE 2 | S 3 | — | SSE 3 | SW 3 | — | SE 2 | SSE 2 | — | SE 3 | SE 3 |
| kJ | 19 | 19 | 3 | 1 | 2 | — | 3 | 2 | 1 | 2 | 4 | — | 3 | 2 | — | 2 | 1 | — | 3 | 3 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 1634 | 314 | 314 | 325 | 327 | 314 | 314 | 314 | 324 | 234 | 234 | 327 | 324 | 236 | 327 | 327 | 448 | 915 | 448 | 448 |
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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