Surf Forecasts:
21st Street (Miami) surf forecast from 11 Sep 2026:
- Most powerful swell: Thursday 17 Sep, 11AM (local time) - 4ft (1.2m), 8s period, NNE swell with 155 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 1.2m 8s and forecast to arrive on Thursday (Sep 17) 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 0.4m 5s period and expected on Sunday (Sep 13) at 11PM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11AM (Thu 17th Sep) | 4ft (1.2m) 8s |
Table - best surf conditions forecast for 21st Street (Miami) over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s cookin’ for 21st Street in Miami. Gotta be straight with you – it’s a long stretch of not much to get excited about. The whole 16-day window is a slow grind, with the first solid week and a half offering nothing but tiny, choppy, and generally poor surf conditions. We’re talkin’ a real dry spell from now through to the end of the third week of September.
The water temp is sittin’ at a balmy 87°, which is a touch warmer than usual for this time of year – feels like a bathtub out there.
The only time the ocean shows a glimmer of life is right at the tail end of the run, around Thursday the 24th of September. We finally get some clean conditions with cross-off winds from the SW and a moderate cross-shore, and the swell bumps up to 3ft from the NNE with a period of 9 seconds. Wave energy climbs to a moderate 163. It’s not world-class, but it’s the best we’ve got – surfable waves, just very ordinary. The next morning, Friday the 25th, the swell holds around 4ft with clean cross-off winds, but the energy is higher at 168. For the afternoon, the swell even nudges up to 5ft from the NE, with the energy at 210 – moderate, but it’s all still classed as poor surf conditions.
The real standout for the whole forecast, if you can wait that long, is Saturday the 26th of September. The swell pushes up to 6ft from the ENE in the morning (209 energy) and then up to 6ft from the same direction in the afternoon, with the energy hitting 270. The wind stays clean and cross-off from the SSW. Now, a 6ft swell on a beach break like 21st Street will be a bit of a handful for beginners – more of an intermediate spot for that size. The period is short at 6 seconds, so it’ll be a bit lumpy and disorganised, but it’s the only window with any real grunt. If you’re hungry for a paddle in the last week of the month, that’s your best bet, though remember it’s a long-range call and not as sure as a near-term forecast.
For the rest of the run, it’s pretty much a write-off for a paddle. With that wind and tiny swell, the setup at this beach-and-reef spot would be more interesting for kite surfing than trying to get a surfboard to work.
Rusty.
Short Range ForecastModerate rain (total 19mm), heaviest on Sun morning. Warm (max 30°C on Sat afternoon, min 28°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 7mm), mostly falling on Tue morning. Warm (max 29°C on Mon afternoon, min 27°C on Wed night). Winds increasing (light winds from the E on Mon night, fresh winds from the NE by Wed afternoon). | |||||||||||||||||||
Fri 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | ||||||||||||||
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 4 | ESE 3 | SE 4 | SE 4 | SSE 4 | SE 4 | SSE 5 | E 9 | E 9 | E 8 | E 8 | E 8 | E 9 | E 4 | ENE 4 | NNE 8 | NNE 7 | NNE 8 | NNE 8 | NNE 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 6 | 7 | 7 | 7 | 8 | 9 | 14 | 6 | 6 | 6 | 6 | 6 | 6 | 16 | 18 | 62 | 125 | 155 | 110 | 88 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | on | cross | cross | cross-on | cross-on | on | cross-on | on | on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 9:21PM1.00m | 9:47AM1.02m | 10:00PM0.98m | 10:29AM1.00m | 10:38PM0.95m | 11:11AM0.96m | 11:16PM0.91m | 11:54AM0.91m | 11:55PM0.85m | 12:38PM0.86m | 00:37AM0.80m | 1:28PM0.81m | 1:24AM0.75m | |||||||
Low Tide | 3:13PM0.02m | 3:32AM-0.01m | 3:55PM0.05m | 4:13AM0.00m | 4:36PM0.10m | 4:52AM0.03m | 5:16PM0.16m | 5:32AM0.08m | 5:58PM0.22m | 6:13AM0.13m | 6:42PM0.28m | 6:58AM0.18m | 7:32PM0.34m | |||||||
 |  | | |  | | | |  | |  | | | | | |  |  | | | |
 | — | — | 7:03 | — | — | 7:05 | — | — | 7:05 | — | — | 7:05 | — | — | 7:05 | — | — | 7:05 | — | — |
 | 7:29 | — | — | 7:28 | — | — | 7:27 | — | — | 7:25 | — | — | 7:24 | — | — | 7:22 | — | — | 7:22 | — |
mm | 2 | 1 | 3 | 2 | 4 | 4 | 2 | 1 | — | — | — | 1 | — | 2 | 2 | 2 | — | — | 1 | 5 |
Temp °C | 29 | 29 | 29 | 30 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 28 | 27 | 28 | 28 |
Feels °C | 32 | 31 | 32 | 33 | 32 | 32 | 32 | 33 | 32 | 31 | 32 | 32 | 30 | 29 | 29 | 27 | 25 | 27 | 28 | 27 |
Swell 1 Height (m) Direction Period (s) | NE 6 | NNE 6 | E 8 | E 8 | E 4 | E 9 | E 9 | E 9 | E 9 | E 8 | E 8 | E 8 | SE 4 | E 8 | E 8 | NNE 8 | NNE 7 | NNE 8 | NNE 8 | NNE 8 |
| kJ | 6 | 4 | 5 | 5 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 2 | 6 | 5 | 62 | 125 | 155 | 110 | 88 |
Swell 2 Height (m) Direction Period (s) | E 7 | E 8 | NE 6 | NE 6 | E 8 | NE 8 | NE 9 | NE 9 | NE 9 | NE 9 | NE 11 | NE 10 | E 9 | NE 10 | NE 9 | E 8 | E 8 | E 8 | E 8 | E 8 |
| kJ | 4 | 4 | 1 | 1 | 6 | 3 | 3 | 3 | 3 | 3 | 4 | 4 | 6 | 4 | 3 | 1 | 1 | 1 | 1 | 1 |
Swell 3 Height (m) Direction Period (s) | NE 8 | NE 9 | NE 9 | NE 9 | NE 8 | — | NE 8 | NE 9 | — | — | — | — | NE 10 | — | — | — | — | — | E 8 | — |
| kJ | 2 | 3 | 3 | 3 | 3 | — | 3 | 3 | — | — | — | — | 4 | — | — | — | — | — | 1 | — |
Wind waves Height (m) Direction Period (s) | SE 4 | ESE 3 | SE 4 | SE 4 | SSE 4 | SE 4 | SSE 5 | SE 4 | SE 3 | SE 3 | ESE 3 | ESE 4 | ENE 3 | E 4 | ENE 4 | E 4 | E 5 | E 4 | ESE 4 | ESE 4 |
| kJ | 6 | 7 | 7 | 7 | 8 | 9 | 14 | 5 | 3 | 2 | 2 | 5 | 3 | 16 | 18 | 12 | 20 | 15 | 10 | 15 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 1634 | 394 | 448 | 1634 | 360 | 234 | 517 | 234 | 234 | 731 | 500 | 845 | 845 | 1149 | 915 | 845 | 746 | 338 | 250 | 232 |
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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