Surf Forecasts:
21st Street (Miami) surf forecast from 4 Sep 2026:
- Most powerful swell: Thursday 10 Sep, 5AM (local time) - 2.5ft (0.7m), 10s period, NNE swell with 83 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 0.7m 10s and forecast to arrive on Thursday (Sep 10) at 5AM. Winds are predicted to be 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 Friday (Sep 04) at 8PM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5AM (Thu 10th Sep) | 2.5ft (0.7m) 10s |
Table - best surf conditions forecast for 21st Street (Miami) over the next 16 days.
The Lowdown
Well, folks, Rusty here. Let’s be straight with you: looking at the 16-day window for 21st Street (Miami), it’s a pretty grim run. We’ve got a solid gap of flat, weak conditions through the first week and a half, so don’t expect much.
The whole period starts off tough. From Friday, September 4th, right through to Sunday, September 13th, it’s all poor surf with barely a ripple. Swell heights are tiny, mostly 0.7ft to 2ft, and the wind is cross or onshore pretty much the whole time. Energy readings are in the weak range—like 44 and 23 (low two-digit values) on Friday morning and afternoon, and it drops into single digits over the weekend. The short period (3–5 seconds) means no push, no shape. Not worth paddling out.
There’s a little hiccup on Monday the 7th morning with clean conditions and a tiny 0.7ft cross-offshore breeze, but there’s just no swell to ride. By Monday afternoon and Tuesday, it’s back to choppy junk. The water temperature is about average for this time of year, nothing unusual.
Then we get to Monday, September 14th, and here’s the only real standout in the whole outlook. The swell picks up to 4ft to 5ft out of the NE, with a moderate wave energy reading of 269 – that’s the strongest we see. But, and it’s a big but, the wind is a fresh 19-22 mph cross-onshore from the NE, making it lumpy and messy. It’s not clean, it’s not well-shaped, and with that short period (6-7 seconds), the whole setup looks more interesting for kite surfing than paddle surfing. It’s really only for the experienced if they’re desperate, and with crowds listed as “often” here, expect company.
Tuesday the 15th through the rest of the run fades back into small, weak surf with cross-onshore winds and energy readings dropping back below 100. The last few days from the 16th onward are all under 3ft and choppy – not worth a second look.
So, bottom line: the surf is poor for almost the entire 16 days. The only spike in swell on the 14th is blown out. This blank run is a bit normal for the area when conditions are like this, but forecasts can change. Keep an eye on it, but for now, leave the board at home.
Rusty.
Short Range ForecastLight rain (total 7mm), mostly falling on Fri morning. Warm (max 30°C on Thu night, min 27°C on Fri morning). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 18mm), heaviest on Mon night. Warm (max 31°C on Mon afternoon, min 28°C on Sun night). Wind will be generally light. | ||||||||||||||||||
Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | ||||||||||||||
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 6 | ESE 5 | E 5 | ESE 4 | SE 4 | SE 4 | SE 4 | E 7 | ESE 3 | E 9 | E 8 | E 8 | E 8 | E 8 | E 8 | NE 10 | NNE 10 | NNE 8 | NNE 8 |
Wave Graph  | |||||||||||||||||||
 kJ | 12 | 26 | 12 | 9 | 7 | 6 | 6 | 1 | 3 | 6 | 5 | 5 | 5 | 5 | 5 | 17 | 60 | 48 | 45 |
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 | cross-on | cross | cross-on | cross-off | cross-off | cross-on | cross | cross-on | cross-on | on | on | on | on |
High Tide | 1:40AM0.81m | 2:44PM0.83m | 2:50AM0.79m | 3:57PM0.83m | 4:07AM0.80m | 5:09PM0.85m | 5:21AM0.84m | 6:12PM0.90m | 6:27AM0.89m | 7:06PM0.94m | 7:24AM0.95m | 7:54PM0.98m | |||||||
Low Tide | 8:09AM0.08m | 8:50PM0.25m | 9:21AM0.10m | 10:06PM0.25m | 10:35AM0.10m | 11:18PM0.21m | 11:45AM0.07m | 00:21AM0.16m | 12:45PM0.04m | 1:16AM0.09m | 1:39PM0.02m | 2:05AM0.04m | |||||||
 |  |  |  |  | | | | | |  | | | | | | | | | |
 | — | 7:01 | — | — | 7:01 | — | — | 7:01 | — | — | 7:01 | — | — | 7:03 | — | — | 7:03 | — | — |
 | 7:37 | — | 7:37 | — | — | 7:36 | — | — | 7:34 | — | — | 7:32 | — | — | 7:31 | — | — | 7:30 | — |
mm | — | 4 | — | 1 | — | — | 2 | — | — | 7 | — | 3 | 7 | — | — | 1 | — | — | — |
Temp °C | 30 | 29 | 29 | 29 | 29 | 30 | 29 | 29 | 30 | 30 | 29 | 31 | 30 | 29 | 30 | 30 | 29 | 29 | 29 |
Feels °C | 32 | 33 | 33 | 32 | 32 | 32 | 34 | 33 | 32 | 32 | 33 | 34 | 32 | 34 | 32 | 32 | 32 | 31 | 31 |
Swell 1 Height (m) Direction Period (s) | ESE 6 | E 5 | E 5 | E 8 | E 8 | E 8 | E 8 | SSE 4 | E 7 | E 9 | E 8 | E 8 | E 8 | E 8 | NE 11 | NE 10 | NNE 10 | NNE 8 | NNE 8 |
| kJ | 12 | 13 | 12 | 5 | 1 | 1 | 1 | 1 | 1 | 6 | 5 | 5 | 5 | 5 | 5 | 17 | 60 | 48 | 45 |
Swell 2 Height (m) Direction Period (s) | E 9 | E 8 | E 8 | NE 8 | E 8 | N 8 | NE 7 | E 3 | NE 6 | — | — | NE 9 | NE 8 | NE 10 | E 8 | E 8 | E 9 | NE 10 | NE 10 |
| kJ | 6 | 5 | 5 | 3 | 1 | 1 | 2 | 1 | 1 | — | — | 3 | 3 | 4 | 5 | 5 | 6 | 27 | 27 |
Swell 3 Height (m) Direction Period (s) | NE 9 | — | NE 8 | — | — | E 8 | — | E 7 | E 10 | NE 9 | NE 9 | NE 7 | NE 10 | — | — | E 9 | N 6 | E 9 | E 8 |
| kJ | 3 | — | 3 | — | — | 4 | — | 1 | 2 | 3 | 3 | 2 | 4 | — | — | 2 | 1 | 6 | 5 |
Wind waves Height (m) Direction Period (s) | — | ESE 5 | SSE 4 | ESE 4 | SE 4 | SE 4 | SE 4 | — | ESE 3 | — | — | SE 3 | — | — | ESE 2 | ESE 3 | ESE 4 | E 4 | E 4 |
| kJ | — | 26 | 3 | 9 | 7 | 6 | 6 | — | 3 | — | — | 3 | — | — | 1 | 3 | 8 | 7 | 15 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 232 | 232 | 1634 | 326 | 731 | 1634 | 962 | 353 | 324 | 327 | 327 | 324 | 359 | 359 | 324 | 1149 | 915 | 338 | 427 |
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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