Surf Forecasts:
21st Street (Miami) surf forecast from 24 Aug 2026:
- Most powerful swell: Monday 31 Aug, 11AM (local time) - 2.5ft (0.8m), 4s period, E swell with 25 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 0.8m 4s and forecast to arrive on Monday (Aug 31) at 11AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 4s period and expected on Wednesday (Aug 26) at 8PM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11AM (Mon 31st Aug) | 2.5ft (0.8m) 4s |
Table - best surf conditions forecast for 21st Street (Miami) over the next 16 days.
The Lowdown
Alright, let’s have a look at what we’ve got for the next couple of weeks at 21st Street (Miami). To be straight with you, it’s a flat spell, and a long one at that. We’re looking at a good stretch here with basically nothing worth paddling out for until we get deep into the second week.
Right now, from Monday, the 24th of August, right through the rest of the month and into the first few days of September, we are dealing with tiny, weak dribblers. Swell heights are hanging around 0.3 ft to 2 ft, and the energy is just pathetic, with readings as low as 4 and barely cracking 30 in that first week. The wind is mostly cross-on or onshore, which just makes the little bumps even less fun. The water is warm though, sitting at 87°, which is a touch warmer than normal for this time of year.
The first signs of something a little different show up around the afternoon of Thursday, the 3rd of September. We get a light cross-shore breeze with a bit of long-period energy coming in from the east, period around 12 seconds. That combined energy bumps up to 104, which is still only moderate, and the swell height is only around 2 ft. It’s clean, but the size just isn’t there. Then Friday morning the 4th sees a bit of offshore wind from the west at 9 mph with that same E swell, about 1 ft. The conditions will be clean, but again, you’re not going to be riding much.
The best of a very quiet window looks to be the morning of Saturday the 5th of September. We’ve got a moderate offshore wind from the west at 12 mph and a 1 ft, 12-second NE swell. It’s clean, glassy under the wind, but the energy is low, only 31. For a patient surfer on a big board, you might find a little waist-high something, but that’s your standout for this entire outlook because everything else is smaller or wind-affected.
Even looking at the 6th and 7th, we’re still stuck on tiny 1 ft NE swells with moderate or light winds. It’s clean, but consistently small. The energy never really climbs.
Basically, you can write this fortnight off for a proper surf. The swell window just isn't working for us. A long flat spell like this is more normal for the area when the angles aren't right, but forecasts can change, so keep an eye on it. Until then, it’s a good time for a paddleboard or a kite if the wind picks up right, but for a surf, it’s a no-go.
Rusty.
Short Range ForecastModerate rain (total 17mm), heaviest on Tue night. Warm (max 30°C on Mon afternoon, min 28°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Thu night. Warm (max 30°C on Thu afternoon, min 29°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Mon 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | ||||||||||||||
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) | SE 3 | E 8 | SE 3 | ESE 3 | ESE 3 | SE 4 | ESE 4 | ESE 4 | SE 4 | SE 4 | ESE 3 | ESE 4 | E 9 | E 4 | E 4 | E 8 | E 8 | E 8 | E 8 | E 4 |
Wave Graph  | ||||||||||||||||||||
 kJ | 3 | 2 | 3 | 4 | 8 | 17 | 11 | 16 | 14 | 16 | 10 | 8 | 6 | 13 | 8 | 5 | 6 | 5 | 5 | 19 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross-on | on | cross-on | on | on | on | on | on | on | on | on | on | on | on |
High Tide | 6:55PM0.77m | 6:56AM0.73m | 7:35PM0.81m | 7:41AM0.79m | 8:12PM0.85m | 8:22AM0.84m | 8:47PM0.87m | 9:01AM0.87m | 9:22PM0.89m | 9:40AM0.91m | 9:57PM0.90m | 10:20AM0.92m | 10:32PM0.90m | |||||||
Low Tide | 1:02AM0.22m | 1:11PM0.10m | 1:42AM0.17m | 1:54PM0.07m | 2:19AM0.12m | 2:33PM0.05m | 2:55AM0.08m | 3:11PM0.05m | 3:31AM0.05m | 3:49PM0.05m | 4:07AM0.02m | 4:28PM0.07m | 4:45AM0.01m | |||||||
 |  |  | | |  |  | | | | | | |  | | | | | | | |
 | — | — | 6:56 | — | — | 6:58 | — | — | 6:58 | — | — | 6:58 | — | — | 6:58 | — | — | 6:58 | — | — |
 | 7:47 | — | — | 7:46 | — | — | 7:45 | — | — | 7:45 | — | — | 7:44 | — | — | 7:43 | — | — | 7:42 | — |
mm | — | 1 | — | — | 6 | 3 | 3 | 4 | — | — | 1 | — | 1 | — | — | — | 1 | — | — | — |
Temp °C | 30 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 30 | 29 | 29 | 29 | 29 | 29 | 30 | 29 | 30 | 30 | 29 |
Feels °C | 31 | 30 | 31 | 31 | 31 | 31 | 31 | 32 | 31 | 32 | 31 | 31 | 31 | 31 | 31 | 32 | 31 | 33 | 33 | 31 |
Swell 1 Height (m) Direction Period (s) | E 8 | SSE 4 | E 8 | E 8 | NE 8 | E 8 | E 7 | NE 9 | E 8 | E 8 | NE 14 | E 9 | SSE 4 | — | E 8 | SSE 4 | E 8 | SE 4 | E 8 | NE 10 |
| kJ | 1 | 2 | 1 | 1 | 2 | 1 | 1 | 3 | 1 | 1 | 7 | 6 | 3 | — | 5 | 1 | 5 | 4 | 5 | 4 |
Swell 2 Height (m) Direction Period (s) | NE 8 | E 8 | NE 8 | NE 8 | E 10 | — | E 10 | — | NE 8 | NE 8 | NE 8 | NE 9 | E 9 | NE 12 | NE 11 | E 8 | NE 11 | E 8 | SSE 4 | NE 10 |
| kJ | 3 | 1 | 3 | 2 | 2 | — | 2 | — | 3 | 3 | 3 | 3 | 6 | 6 | 5 | 5 | 5 | 5 | 1 | 4 |
Swell 3 Height (m) Direction Period (s) | E 11 | NE 8 | N 7 | N 7 | N 6 | E 10 | E 8 | N 16 | NE 15 | NE 15 | NE 10 | NE 13 | NE 9 | NE 8 | NE 8 | NE 11 | NE 8 | NE 10 | NE 10 | — |
| kJ | 2 | 2 | 1 | 1 | 1 | 2 | 1 | 5 | 9 | 8 | 4 | 7 | 3 | 3 | 3 | 5 | 2 | 4 | 4 | — |
Wind waves Height (m) Direction Period (s) | SE 3 | — | SE 3 | ESE 3 | ESE 3 | SE 4 | ESE 4 | ESE 4 | SE 4 | SE 4 | ESE 3 | ESE 4 | E 4 | E 4 | E 4 | E 4 | E 3 | ENE 4 | E 4 | E 4 |
| kJ | 2 | — | 3 | 4 | 8 | 17 | 11 | 16 | 14 | 16 | 10 | 8 | 4 | 13 | 8 | 4 | 6 | 3 | 4 | 19 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 1459 | 448 | 448 | 1634 | 448 | 731 | 1634 | 394 | 360 | 959 | 326 | 232 | 338 | 360 | 731 | 375 | 1042 | 865 | 731 | 731 |
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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