Surf Forecasts:
21st Street (Miami) surf forecast from 7 Aug 2026:
- Most powerful swell: Friday 7 Aug, 11PM (local time) - 2.5ft (0.7m), 8s period, E swell with 68 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 8s and forecast to arrive on Friday (Aug 07) at 11PM. Winds are predicted to be 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 Monday (Aug 10) at 5PM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11PM (Fri 7th Aug) | 2.5ft (0.7m) 8s |
Table - best surf conditions forecast for 21st Street (Miami) over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's be honest, looking at this 16-day window for the Miami area, it's a bit of a flat spell. The only break on the radar is 21st Street (Miami), and the outlook is pretty grim. We're looking at a long stretch of poor surf with no real standout days. The forecast shows a gap from the start all the way through, with no worthwhile waves to speak of. The combined swell energy is weak, struggling to even hit triple digits, and the wind is a persistent problem. For the first few days, we've got a messy cross-onshore breeze kicking up a chop, making it tough to find anything rideable. The water temperature is sitting at 86°F with an anomaly of 1°F, which is pretty much average for this time of year.
Through the first week, from Friday the 7th right through to the following Thursday, it's all poor surf conditions. The swell is tiny, mostly under 3 ft, and the wind is either cross-on or onshore, keeping things choppy and uninviting. The energy is consistently low, with values like 107 on Friday morning, dropping to single digits by the end of the week. The swell period is short, often 4 to 8 seconds, meaning weak, wind-driven junk. Even the days with a bit more push, like Sunday the 9th with 3 ft, are ruined by a short period of 4 seconds and a moderate breeze. It's a real struggle.
Moving into the second week, from the 17th of August onward, it's more of the same. The swell stays tiny, never exceeding 3 ft, and the wind remains a constant cross-on from the southeast. The energy levels are still in the weak zone, with a high of only 40 on the 16th. The swell period does improve a little towards the end, hitting 10 seconds on the 20th, but the swell height is only 1 ft. It's barely a ripple. The conditions are just not there for a paddle session, and honestly, with the persistent onshore wind and small, weak swell, this setup looks more interesting for kite surfing than paddle surfing. There’s nothing to get excited about for the next 16 days.
Rusty.
Short Range ForecastLight rain (total 8mm), mostly falling on Fri morning. Warm (max 29°C on Fri morning, min 28°C on Fri morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 29°C on Mon morning, min 28°C on Mon morning). Wind will be generally light. | ||||||||||||||||||||
Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | |||||||||||||||
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 | NE 9 | E 4 | ESE 4 | E 8 | ESE 4 | ESE 4 | E 4 | ESE 4 | ESE 4 | E 4 | SE 4 | SE 4 | ESE 3 | SE 5 | NE 8 | E 7 | SE 3 |
Wave Graph  | |||||||||||||||||||||
 kJ | 57 | 32 | 26 | 22 | 12 | 16 | 20 | 40 | 24 | 17 | 5 | 14 | 9 | 5 | 6 | 3 | 4 | 6 | 3 | 4 | 5 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | on | on | cross-on | on | on | on | on | on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 4:11PM0.77m | 4:13AM0.74m | 5:20PM0.79m | 5:24AM0.77m | 6:23PM0.84m | 6:30AM0.81m | 7:21PM0.88m | 7:31AM0.87m | 8:13PM0.92m | 8:26AM0.91m | 9:01PM0.95m | 9:18AM0.93m | 9:47PM0.95m | ||||||||
Low Tide | 9:35AM-0.00m | 10:15PM0.17m | 10:44AM-0.02m | 11:25PM0.14m | 11:51AM-0.05m | 00:30AM0.10m | 12:53PM-0.08m | 1:28AM0.04m | 1:50PM-0.11m | 2:21AM-0.01m | 2:43PM-0.12m | 3:11AM-0.05m | 3:32PM-0.11m | 3:58AM-0.07m | |||||||
 | |  |  | |  | | |  | | | | | | | | | | | | | |
 | 6:48 | — | — | 6:50 | — | — | 6:50 | — | — | 6:50 | — | — | 6:50 | — | — | 6:50 | — | — | 6:52 | — | — |
 | — | 8:01 | — | — | 8:01 | — | — | 8:00 | — | — | 8:00 | — | — | 7:59 | — | — | 7:58 | — | — | 7:58 | — |
mm | 2 | 1 | 3 | — | — | — | — | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 29 | 29 | 29 | 29 | 29 |
Feels °C | 31 | 31 | 32 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 32 | 32 | 32 | 31 | 31 | 31 | 32 | 31 | 32 | 31 | 31 |
Swell 1 Height (m) Direction Period (s) | NE 6 | NE 6 | E 8 | E 8 | SSE 5 | SSE 5 | E 8 | SSE 4 | NE 8 | NE 8 | SSE 5 | NE 8 | E 7 | SSE 5 | E 6 | E 7 | NE 9 | E 7 | SE 4 | NE 8 | E 7 |
| kJ | 34 | 12 | 22 | 22 | 7 | 5 | 10 | 7 | 3 | 3 | 13 | 3 | 4 | 8 | 3 | 3 | 3 | 4 | 4 | 3 | 1 |
Swell 2 Height (m) Direction Period (s) | NE 8 | E 8 | NE 9 | NE 9 | E 8 | NE 9 | NNE 9 | NE 8 | NE 9 | NE 8 | E 7 | — | NE 8 | E 7 | NE 8 | NE 8 | SSE 4 | NE 8 | E 7 | E 7 | NE 9 |
| kJ | 9 | 32 | 12 | 13 | 12 | 12 | 7 | 3 | 3 | 3 | 4 | — | 3 | 3 | 3 | 3 | 1 | 3 | 1 | 4 | 3 |
Swell 3 Height (m) Direction Period (s) | NNE 8 | NE 8 | NE 5 | NE 5 | NE 9 | NNE 9 | NE 4 | NE 9 | — | — | NE 8 | — | E 7 | NE 8 | N 8 | — | N 9 | — | NE 8 | NE 8 | — |
| kJ | 7 | 11 | 4 | 4 | 12 | 8 | 1 | 3 | — | — | 3 | — | 1 | 3 | 1 | — | 2 | — | 3 | 3 | — |
Wind waves Height (m) Direction Period (s) | E 8 | ESE 5 | ESE 4 | ESE 4 | E 5 | E 4 | ESE 4 | E 8 | ESE 4 | ESE 4 | E 4 | ESE 4 | ESE 4 | E 4 | SE 4 | SE 4 | ESE 3 | SE 5 | — | ESE 3 | SE 3 |
| kJ | 57 | 21 | 26 | 16 | 10 | 16 | 20 | 40 | 24 | 17 | 5 | 14 | 9 | 5 | 6 | 3 | 4 | 6 | — | 4 | 5 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 915 | 925 | 1149 | 517 | 1502 | 326 | 421 | 1634 | 326 | 448 | 1560 | 1174 | 841 | 1634 | 1025 | 359 | 1634 | 991 | 731 | 377 | 875 |
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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