Surf Forecasts:
21st Street (Miami) surf forecast from 20 Aug 2026:
- Most powerful swell: Wednesday 26 Aug, 8AM (local time) - 2.5ft (0.7m), 4s period, ESE swell with 15 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 4s and forecast to arrive on Wednesday (Aug 26) at 8AM. 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 3s period and expected on Saturday (Aug 22) at 8AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8AM (Wed 26th Aug) | 2.5ft (0.7m) 4s |
Table - best surf conditions forecast for 21st Street (Miami) over the next 16 days.
The Lowdown
Alright, let’s get into it. Rusty here.
Look, I’m gonna level with you: the next sixteen days are a tough watch for 21st Street (Miami). The setup is a real struggle. We’re talking about a stretch where the ocean just refuses to give us anything worthwhile. The first bit of hope? There isn’t a single standout session in the whole window. The first few days, from Thursday the 20th through the end of August, are all marked by tiny, weak energy. The swell is barely a ripple, mostly coming out of the East at a short, weak period. The water’s a touch warmer than normal at 87°F, but that’s the only good news.
Thursday morning has a little 0.7ft E swell with a light cross-offshore breeze, but it’s so small it’s not even worth paddling for. The energy is a measly 7 for the combined swell. Later that day, a storm risk kicks up a moderate cross-shore chop, making it even worse. This pattern just repeats: Friday, Saturday, Sunday... all the same story. Tiny 0.7ft to 2ft swells, short periods around 4 to 9 seconds, and mostly cross-onshore or onshore wind. The wave energy stays low, never hitting triple digits. It’s frustrating.
We do see a slight uptick in energy around the 29th and 30th of August, where the combined swell energy hits 32 and then 24, but the swell is still tiny (2ft to 2ft) and the wind is onshore. It’s just messy, blown-out junk. The period is a pathetic 4 to 5 seconds. That’s no good for anyone.
The first week of September is more of the same. Mornings might be clear, but the wind is onshore from the East or ESE, and the swell is back down to 0.7ft. The energy is weak, in the single digits. The only slight change is on Friday, September 4th, when a light cross-offshore breeze from the SSW cleans things up a bit, but the swell is still just 0.7ft. It’s a tease.
So the honest truth? There is no good surf on offer here. This is a blank run for the area. The break is inconsistent at the best of times, and this forecast is a perfect example of that. With such tiny, weak swell and constant onshore wind, this setup looks more interesting for kite surfing than paddle surfing. The ocean is just not cooperating. Keep your board in the car and wait for the next change.
Stay patient.
Rusty
Short Range ForecastHeavy rain (total 22mm), heaviest during Thu night. Warm (max 31°C on Thu afternoon, min 28°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Sun morning. Warm (max 29°C on Sun morning, min 28°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | |||||||||||||||
AM | 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 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 9 | E 8 | E 8 | E 8 | SE 4 | E 8 | SE 4 | ESE 4 | E 3 | ESE 4 | ESE 4 | ESE 4 | ESE 4 | E 4 | ESE 4 |
Wave Graph  | |||||||||||||||||||||
 kJ | 6 | 6 | 6 | 5 | 5 | 5 | 6 | 6 | 5 | 5 | 7 | 3 | 5 | 5 | 6 | 8 | 10 | 10 | 10 | 4 | 11 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross | cross | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | on | cross-on | on | on | on | on | on | on |
High Tide | 3:11PM0.71m | 3:05AM0.66m | 4:14PM0.70m | 4:07AM0.65m | 5:15PM0.71m | 5:10AM0.66m | 6:09PM0.74m | 6:07AM0.69m | 6:55PM0.77m | 6:56AM0.73m | 7:35PM0.81m | 7:41AM0.79m | 8:12PM0.85m | ||||||||
Low Tide | 8:36AM0.13m | 9:13PM0.28m | 9:34AM0.16m | 10:18PM0.30m | 10:35AM0.16m | 11:21PM0.29m | 11:33AM0.15m | 00:16AM0.26m | 12:25PM0.13m | 1:02AM0.22m | 1:11PM0.10m | 1:42AM0.17m | 1:54PM0.07m | 2:19AM0.12m | |||||||
 |  |  | | | |  | |  | | |  | | | | | | | | | | |
 | 6:54 | — | — | 6:54 | — | — | 6:56 | — | — | 6:56 | — | — | 6:56 | — | — | 6:56 | — | — | 6:58 | — | — |
 | — | 7:52 | — | — | 7:51 | — | — | 7:50 | — | — | 7:49 | — | — | 7:47 | — | — | 7:46 | — | — | 7:45 | — |
mm | — | 2 | 10 | — | 3 | 5 | — | 1 | 1 | 1 | — | — | — | 1 | — | — | — | — | — | — | — |
Temp °C | 30 | 31 | 30 | 30 | 30 | 29 | 29 | 30 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 30 | 29 |
Feels °C | 33 | 32 | 34 | 34 | 32 | 32 | 33 | 33 | 30 | 32 | 30 | 32 | 32 | 31 | 30 | 31 | 31 | 31 | 31 | 32 | 30 |
Swell 1 Height (m) Direction Period (s) | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | SSE 3 | E 8 | E 3 | E 4 | E 8 | SSE 4 | E 4 | SSE 4 | SSE 4 | E 8 | NE 8 | NE 8 | E 7 | SSE 4 | E 9 |
| kJ | 6 | 6 | 6 | 5 | 5 | 5 | 1 | 6 | 1 | 1 | 1 | 4 | 1 | 3 | 2 | 1 | 2 | 2 | 1 | 3 | 2 |
Swell 2 Height (m) Direction Period (s) | NE 6 | NE 9 | NE 9 | NE 9 | NE 8 | NE 9 | E 9 | NE 10 | E 8 | E 8 | NE 9 | E 8 | E 8 | E 8 | E 8 | NE 8 | E 11 | E 10 | — | E 7 | — |
| kJ | 1 | 3 | 3 | 3 | 2 | 3 | 6 | 4 | 5 | 5 | 3 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | — | 1 | — |
Swell 3 Height (m) Direction Period (s) | — | NE 6 | — | N 9 | — | E 14 | E 3 | E 13 | NE 9 | — | E 12 | NE 8 | NE 8 | NE 8 | NE 8 | E 11 | N 8 | E 10 | — | E 10 | — |
| kJ | — | 1 | — | 2 | — | 4 | 1 | 3 | 3 | — | 3 | 3 | 3 | 3 | 2 | 2 | 1 | 2 | — | 2 | — |
Wind waves Height (m) Direction Period (s) | — | S 3 | SSE 3 | SSE 3 | SE 3 | SSE 3 | — | SE 3 | SSE 4 | — | SE 4 | — | SE 4 | ESE 4 | E 3 | ESE 4 | ESE 4 | ESE 4 | ESE 4 | E 4 | ESE 4 |
| kJ | — | 5 | 3 | 2 | 2 | 1 | — | 5 | 1 | — | 7 | — | 5 | 5 | 6 | 8 | 10 | 10 | 10 | 4 | 11 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 353 | 327 | 731 | 353 | 731 | 692 | 1210 | 353 | 448 | 731 | 731 | 394 | 991 | 731 | 360 | 448 | 609 | 448 | 448 | 1655 | 841 |
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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