
Surf Forecasts:
21st Street (Miami) surf forecast from 13 Sep 2026:
- Most powerful swell: Wednesday 16 Sep, 8PM (local time) - 4ft (1.2m), 8s period, NNE swell with 172 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 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 0.5m 5s period and expected on Thursday (Sep 17) at 5PM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Wed 16th Sep) | 4ft (1.2m) 8s |
Table - best surf conditions forecast for 21st Street (Miami) over the next 16 days.
The Lowdown
Alright, let’s get into it.
Right off the bat, I’m gonna be straight with you—this 16-day stretch is looking pretty grim for any real surf at 21st Street (Miami). There’s very little on offer, and what’s there is small, weak, and mostly messy. If you’re a beginner, there’s nothing to worry about—it’s not going to get big—but honestly, there’s barely a wave worth paddling for until the very end of the period.
The first week and a half is basically a write-off. From the 13th through the 23rd, we’ve got swell heights hovering between 0.3ft and 3.6ft, but the energy is all over the place—mostly weak, with combined energy readings from as low as 3 up to 168 on the 16th afternoon. That little bump on the 16th is the strongest pulse of the whole run, but it’s still just 3.6ft at 8 seconds out of the NNE. Short period, onshore winds, choppy conditions—it’s not going to be any kind of classic. That day and the 17th morning have the biggest waves, but they’re sloppy, cross-onshore, and honestly more of a mess than a wave. For beginners, the swell stays under 5ft all through, so it isn’t dangerous, but it’s just not fun.
From the 18th to the 23rd, we’re dropping back down to 0.3ft to 3ft, with wind mostly cross or cross-on, and the energy fades again—down to single digits at times. It’s the kind of period where you’d be lying if you said you saw a surfable wave out there. There are a couple of cleaner moments—the 19th and 20th mornings have some cross-off or offshore wind and clean conditions, but the swell is tiny, 1.3ft to 1.6ft, and the energy is weak (35 and 16 respectively). You could maybe catch a knee-high slop if you were desperate, but it’s not worth the paddle.
Here’s the thing though—the tail end of the run, around the 24th, things start to look a little more interesting. That Thursday the 24th is our one true standout. Morning has a 2.6ft NNE swell at 10 seconds, with a light cross-off breeze, and combined energy of 119—moderate, a real step up. Then the afternoon goes glassy. Dead glass. The swell stays at 2.6ft, but with clean conditions and that longer period, it’s actually surfable. It’s still not big—beginner-friendly even—but for 21st Street, that glassy afternoon is the best window of the whole forecast. Get out there if you can.
After that, the 25th and 26th are still small, with 2ft to 2.3ft NNE swell, but the winds are cross-onshore and choppy again, so it’s back to ordinary. The period does stretch to 11 seconds on the 26th, which adds a bit more push, but the energy is moderate (154 on the morning, 142 in the afternoon), and the chop kills it. The 27th and 28th just fade away again—small, onshore, nothing doing.
So, bottom line: this is a pretty barren run. The only real highlight is the glassy Thursday the 24th afternoon—small but clean, a proper little session. Everything else is either too small, too choppy, or both. It’s not a period to be excited about, but that one afternoon might give you a reason to grab your board.
Stay patient.
Short Range ForecastModerate rain (total 17mm), heaviest on Sat night. Warm (max 30°C on Sun afternoon, min 28°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 24mm), heaviest during Tue night. Warm (max 29°C on Wed afternoon, min 27°C on Wed night). Wind will be generally light. | ||||||||||||||||||
Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | ||||||||||||||
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 8 | E 9 | E 9 | E 9 | E 9 | E 8 | E 8 | E 8 | E 9 | E 8 | NNE 8 | NNE 8 | NNE 8 | NNE 8 | NNE 8 | NNE 8 | NNE 8 | NNE 8 | NNE 8 |
Wave Graph | |||||||||||||||||||
6 | 6 | 8 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 58 | 159 | 135 | 110 | 91 | 69 | 56 | 58 | 42 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-on | cross | cross | cross-on | cross-on | on | cross-on | on | cross-on | cross-on | on | on | cross-on | cross-on | cross | cross | cross-off |
High Tide | 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 | 2:25PM0.78m | 2:22AM0.72m | ||||||
Low Tide | 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 | 7:48AM0.23m | 8:31PM0.37m | |||||||
— | 7:05 | — | — | 7:05 | — | — | 7:05 | — | — | 7:05 | — | — | 7:05 | — | — | 7:07 | — | — | |
7:28 | — | 7:27 | — | — | 7:25 | — | — | 7:24 | — | — | 7:22 | — | — | 7:22 | — | — | 7:21 | — | |
mm | 6 | — | 4 | 2 | — | — | 3 | 1 | 1 | 10 | 1 | — | 3 | 2 | — | 3 | 3 | 2 | 8 |
Temp °C | 29 | 29 | 30 | 29 | 29 | 30 | 29 | 28 | 29 | 28 | 28 | 29 | 28 | 28 | 28 | 28 | 29 | 29 | 29 |
Feels °C | 32 | 33 | 32 | 31 | 33 | 32 | 33 | 30 | 30 | 28 | 30 | 31 | 29 | 30 | 30 | 31 | 32 | 31 | 30 |
Swell 1 Height (m) Direction Period (s) | E 4 | E 9 | E 9 | E 9 | E 9 | E 8 | E 8 | E 8 | E 9 | E 8 | NNE 8 | NNE 8 | NNE 8 | NNE 8 | NNE 8 | NNE 8 | NNE 8 | NNE 8 | NNE 8 |
3 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 58 | 159 | 135 | 110 | 91 | 69 | 56 | 58 | 42 | |
Swell 2 Height (m) Direction Period (s) | E 8 | E 4 | — | NE 9 | SE 4 | NE 9 | NE 9 | NE 10 | SSE 3 | NE 10 | E 8 | E 8 | E 8 | E 8 | SSE 5 | E 8 | E 8 | S 5 | SSE 4 |
6 | 1 | — | 3 | 1 | 3 | 3 | 4 | 1 | 4 | 5 | 6 | 1 | 1 | 12 | 1 | 1 | 13 | 4 | |
Swell 3 Height (m) Direction Period (s) | NE 8 | NE 8 | NE 9 | — | NE 9 | — | NE 11 | NE 10 | NE 10 | — | — | — | — | — | E 8 | — | — | E 5 | E 7 |
3 | 3 | 3 | — | 3 | — | 5 | 4 | 4 | — | — | — | — | — | 1 | — | — | 2 | 1 | |
Wind waves Height (m) Direction Period (s) | SSE 4 | SSE 3 | SSE 3 | SSE 4 | — | SE 2 | — | SE 3 | ENE 2 | ENE 3 | ESE 3 | ESE 3 | ESE 4 | SE 4 | E 4 | ESE 4 | SE 5 | E 4 | E 3 |
3 | 2 | 8 | 3 | — | 1 | — | 2 | 1 | 4 | 2 | 3 | 5 | 14 | 6 | 25 | 25 | 5 | 3 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 360 | 314 | 314 | 234 | 359 | 325 | 1149 | 845 | 845 | 918 | 731 | 375 | 338 | 292 | 314 | 292 | 127 | 156 | 60 |
Best forecast wave conditions in South Florida | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
Header Global | |||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)
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.










