
Surf Forecasts:
21st Street (Miami) surf forecast from 13 Sep 2026:
- Most powerful swell: Wednesday 16 Sep, 8PM (local time) - 4.5ft (1.3m), 8s period, NNE swell with 191 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 1.3m 8s and forecast to arrive on Wednesday (Sep 16) at 8PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 4s period and expected on Thursday (Sep 17) at 8PM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Wed 16th Sep) | 4.5ft (1.3m) 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 we’ve got coming down the pike for our stretch of beach.
Honestly, this is a tough one to start. Looking at the next two weeks, we are staring down the barrel of a pretty flat and messy run. The first real chance of anything worth paddling out for doesn’t show up until Wednesday the 16th, and even then, it’s not exactly going to set the world on fire. There’s a solid gap of quiet conditions before that.
Let’s get into it.
The water is sitting at a balmy 87°F right now, which is a touch warmer than normal for this time of year. You won’t need a spring suit, that’s for sure.
For the first few days, it’s a bust. Sunday the 13th through Tuesday the 15th is all tiny, weak junk. We’re talking knee-high dribble at best, with onshore and cross-onshore winds making a mess of it. The combined energy is barely registering, like 11 to 17 on the scale. Don’t even bother checking the cam.
Wednesday the 16th shows a slight pulse. By the afternoon, we see some swell from the NNE pushing 4ft, but with a short period of 8 seconds. The energy bumps up to 171, which is something, but it’s cross-onshore and choppy. It’s still a pass for me.
Thursday the 17th is more of the same—4ft from the NNE, still short period, still messy. The energy is around 180, so there’s some push, but the wind keeps it from being any good. By Friday the 18th, we’re already dropping back down.
Now, here’s where it gets a little interesting, but you have to wait for it. We’ve got a real stand-out moment on the morning of Wednesday the 23rd of September. The wind goes totally glassy—dead calm, 0 mph from the West. The swell is small, only 1ft, but it’s a long-period groundswell coming from the NE with an 11-second interval. That’s the kind of energy that could wrap in and give you a few clean, lined-up little runners at 21st Street (Miami). The combined energy is 46, so it’s not powerful, but with perfect conditions, those waist-high waves will be as clean as a whistle. This is the absolute best of the whole outlook, but you have to be realistic—it’s small.
Later that afternoon and into Thursday the 24th, the wind swings around and chops it up again, so that window is tight.
Looking further out, there’s a bit more energy showing up around Friday the 25th and Saturday the 26th. We see swell from the NE/NNE around 2ft to 3ft, with long periods of 12 to 13 seconds on the Friday. The combined energy hits 124 to 136, which is solid for such small heights. But it’s cross-onshore or onshore wind again, which is a real shame. Those are groundswells that would be incredible with offshore wind, but as it stands, they’ll be lumpy.
The last few days of the month, the 27th and 28th, are more onshore wind and short-period windswell. Not worth the wax.
So, to sum it up: if you are desperate for a paddle, the only real window for something clean and surfable is the morning of Wednesday the 23rd. It’s tiny, but it’ll be glassy. Everything else is either too small, too choppy, or both.
Keep your eyes on the forecast, because it tends not to stay this poor for long. But for now, that’s the reality.
Rusty.
Short Range ForecastModerate rain (total 11mm), heaviest on Sun night. Warm (max 30°C on Sun afternoon, min 27°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 22mm), heaviest during Fri night. Warm (max 29°C on Fri afternoon, min 27°C on Wed night). Wind will be generally light. | |||||||||||||||||||
Sun 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | ||||||||||||||
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) | E 9 | E 9 | E 9 | E 8 | E 8 | E 8 | E 9 | E 8 | NE 5 | NNE 8 | NNE 7 | NNE 8 | NE 8 | NNE 8 | NNE 8 | NNE 8 | NNE 8 | NE 7 | NNE 7 | NE 7 |
Wave Graph | ||||||||||||||||||||
6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 23 | 165 | 183 | 174 | 136 | 106 | 76 | 51 | 37 | 27 | 21 | 12 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross-on | cross-on | cross-on | on | on | on | cross-on | cross-on | cross-on | cross-on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 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 | 2:25PM0.78m | 2:22AM0.72m | 3:29PM0.77m | 3:30AM0.71m | |||||||
Low Tide | 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 | 7:48AM0.23m | 8:31PM0.37m | 8:48AM0.27m | 9:39PM0.38m | |||||||
— | — | 7:05 | — | — | 7:05 | — | — | 7:05 | — | — | 7:05 | — | — | 7:07 | — | — | 7:07 | — | — | |
7:27 | — | — | 7:25 | — | — | 7:24 | — | — | 7:22 | — | — | 7:22 | — | — | 7:21 | — | — | 7:20 | — | |
mm | 3 | 6 | — | — | — | — | — | 2 | — | 2 | 5 | 2 | — | 4 | 1 | — | 6 | 2 | 1 | — |
Temp °C | 30 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 29 | 29 | 28 | 29 | 29 |
Feels °C | 32 | 31 | 33 | 31 | 32 | 32 | 31 | 30 | 29 | 29 | 28 | 30 | 29 | 29 | 31 | 30 | 29 | 30 | 31 | 31 |
Swell 1 Height (m) Direction Period (s) | E 9 | E 9 | E 9 | E 8 | E 8 | E 8 | E 9 | E 8 | E 8 | NNE 8 | NNE 7 | NNE 8 | NE 8 | NNE 8 | NNE 8 | NNE 8 | NNE 8 | NE 7 | NNE 7 | NE 7 |
6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 5 | 165 | 183 | 174 | 136 | 106 | 76 | 51 | 37 | 27 | 21 | 12 | |
Swell 2 Height (m) Direction Period (s) | NE 9 | NE 9 | NE 9 | NE 9 | NE 9 | NE 10 | NE 10 | NE 10 | N 9 | E 8 | E 8 | E 8 | E 8 | SSE 4 | E 8 | E 8 | E 8 | SSE 4 | E 7 | E 7 |
3 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 1 | 6 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 3 | 1 | 4 | |
Swell 3 Height (m) Direction Period (s) | — | — | NE 9 | — | NE 11 | — | NE 10 | — | NE 9 | — | — | — | E 8 | E 8 | E 8 | — | — | E 7 | E 4 | — |
— | — | 3 | — | 5 | — | 4 | — | 3 | — | — | — | 1 | 1 | 1 | — | — | 1 | 1 | — | |
Wind waves Height (m) Direction Period (s) | SE 3 | S 3 | — | SE 2 | — | SE 3 | ESE 3 | ENE 3 | NE 5 | — | E 4 | ESE 4 | E 3 | E 3 | ESE 4 | SE 4 | SE 4 | E 4 | SE 4 | SE 4 |
2 | 1 | — | 1 | — | 1 | 3 | 4 | 23 | — | 7 | 5 | 2 | 6 | 10 | 14 | 16 | 3 | 4 | 4 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 314 | 234 | 375 | 943 | 234 | 845 | 845 | 918 | 918 | 1264 | 923 | 338 | 292 | 338 | 338 | 338 | 915 | 360 | 1537 | 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.










