Surf Forecasts:
21st Street (Miami) surf forecast from 27 Aug 2026:
- Most powerful swell: Thursday 3 Sep, 5AM (local time) - 3.5ft (1.0m), 5s period, E swell with 43 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 1.0m 5s and forecast to arrive on Thursday (Sep 03) at 5AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 4s period and expected on Sunday (Aug 30) at 2PM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5AM (Thu 3rd Sep) | 3.5ft (1.0m) 5s |
Table - best surf conditions forecast for 21st Street (Miami) over the next 16 days.
The Lowdown
Alright, Rusty here, lookin’ at the charts for our local stretch. Honestly, it’s a pretty grim picture for the next 16 days. There’s really nothing to get excited about, not even a sneaky little window. We've got a long, flat spell ahead.
We start off with 21st Street (Miami). The water temp is sittin’ at a balmy 87°, which is a touch warmer than normal for this time of year—nice for a swim, but you won’t be doin’ any surfin’. The first few days are a complete write-off. We’re talkin’ tiny little 0.3ft to 0.7ft slop, mostly onshore or cross-onshore winds from the SE and ESE. It’s just poor conditions with no energy in the water (combined swell energy is only 16 to 18). That’s a case of the ocean takin’ a nap.
We go from Thursday the 27th of August all the way through to Monday morning the 7th of September with nothing but zeros on the board. That’s over a week of flatness. There's a little spike in swell energy late in the window, but it never translates into real, rideable surf. By Tuesday the 8th of September we get some glassy conditions in the morning (0 mph wind!), but the swell is still a pathetic 1ft with a period of 13 seconds. That’s all show and no go—a groundswell that’s too weak to break properly at a beach break. Combined energy is only 47.
The last few days of the forecast see the combined swell energy creep up into the 60s, 70s, and even 88 on the afternoon of the 10th, but the wave comment is still “poor surf conditions”. The swell heights stay under 2ft, and we’re stuck with onshore winds. It’s just enough energy to make a mess, not enough to surf.
So the reality is, there are zero standout days here. Not one. The best you can hope for is a couple of glassy mornings towards the end of the second week, but with practically no swell to work with, you’d be better off dustin’ off the longboard and prayin’ for a miracle ripple. Nothin’ here for the beginners or the pros—just a whole lot of flat.
"Rusty"
Short Range ForecastModerate rain (total 15mm), heaviest on Thu night. Warm (max 30°C on Thu afternoon, min 29°C on Thu afternoon). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 5mm), mostly falling on Sun afternoon. Warm (max 30°C on Sun afternoon, min 28°C on Wed morning). Wind will be generally light. | |||||||||||||||||||
Thu 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | ||||||||||||||
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 4 | SE 3 | E 9 | E 9 | E 8 | E 4 | E 4 | E 4 | ESE 4 | E 5 | ESE 4 | E 4 | E 4 | E 4 | E 4 | ENE 5 | ENE 5 | E 11 | E 10 | E 4 |
Wave Graph  | ||||||||||||||||||||
 kJ | 8 | 7 | 7 | 6 | 6 | 10 | 8 | 18 | 27 | 11 | 16 | 13 | 9 | 14 | 19 | 22 | 35 | 21 | 18 | 40 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | on | on | on | on | on | cross-on | on | on | on | on | on | on | on | on | on | cross-on | on |
High Tide | 8:47PM0.87m | 9:01AM0.87m | 9:22PM0.89m | 9:40AM0.91m | 9:57PM0.90m | 10:20AM0.92m | 10:32PM0.90m | 11:02AM0.92m | 11:11PM0.89m | 11:48AM0.91m | 11:53PM0.87m | 12:39PM0.88m | 00:42AM0.84m | |||||||
Low Tide | 2:33PM0.05m | 2:55AM0.08m | 3:11PM0.05m | 3:31AM0.05m | 3:49PM0.05m | 4:07AM0.02m | 4:28PM0.07m | 4:45AM0.01m | 5:09PM0.10m | 5:27AM0.01m | 5:53PM0.14m | 6:13AM0.02m | 6:42PM0.19m | |||||||
 |  | |  |  | | | |  | | | | | | | | | | |  | |
 | — | — | 6:58 | — | — | 6:58 | — | — | 6:58 | — | — | 7:00 | — | — | 7:00 | — | — | 7:00 | — | — |
 | 7:45 | — | — | 7:44 | — | — | 7:43 | — | — | 7:42 | — | — | 7:40 | — | — | 7:39 | — | — | 7:38 | — |
mm | 1 | 3 | 3 | — | — | — | 1 | 7 | — | 1 | 3 | — | — | — | 1 | — | — | — | — | 4 |
Temp °C | 30 | 29 | 29 | 29 | 29 | 29 | 30 | 30 | 29 | 30 | 29 | 29 | 30 | 29 | 29 | 30 | 29 | 29 | 30 | 29 |
Feels °C | 32 | 32 | 31 | 31 | 32 | 31 | 33 | 31 | 31 | 33 | 31 | 32 | 33 | 31 | 32 | 33 | 31 | 31 | 32 | 30 |
Swell 1 Height (m) Direction Period (s) | E 8 | E 8 | E 9 | E 9 | SSE 4 | E 8 | E 8 | NE 11 | E 7 | SSE 4 | E 8 | SSE 4 | SE 4 | SSE 5 | E 8 | E 7 | E 12 | E 11 | E 10 | SSE 5 |
| kJ | 1 | 1 | 6 | 6 | 2 | 5 | 5 | 5 | 4 | 6 | 4 | 2 | 4 | 2 | 4 | 4 | 11 | 21 | 18 | 2 |
Swell 2 Height (m) Direction Period (s) | NE 8 | NE 14 | NE 9 | NE 9 | E 8 | NE 11 | NE 11 | NE 8 | NE 10 | NE 10 | NE 10 | E 8 | E 8 | NE 9 | NE 9 | NE 9 | — | NE 11 | SSE 4 | NE 10 |
| kJ | 3 | 7 | 3 | 3 | 5 | 5 | 5 | 3 | 4 | 4 | 4 | 5 | 5 | 3 | 3 | 3 | — | 5 | 1 | 4 |
Swell 3 Height (m) Direction Period (s) | NE 15 | NE 8 | NE 13 | NE 12 | NE 12 | NE 8 | NE 8 | — | NE 8 | E 8 | E 8 | NE 9 | NE 9 | — | — | — | NE 9 | NE 11 | NE 11 | — |
| kJ | 8 | 3 | 7 | 6 | 6 | 3 | 3 | — | 2 | 1 | 1 | 3 | 3 | — | — | — | 3 | 5 | 5 | — |
Wind waves Height (m) Direction Period (s) | SE 4 | SE 3 | ESE 4 | SE 4 | E 3 | E 4 | E 4 | E 4 | ESE 4 | E 5 | ESE 4 | E 4 | E 4 | E 4 | E 4 | ENE 5 | ENE 5 | E 4 | ENE 4 | E 4 |
| kJ | 4 | 5 | 5 | 3 | 5 | 10 | 8 | 18 | 27 | 11 | 16 | 13 | 9 | 14 | 19 | 22 | 35 | 18 | 11 | 40 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 1634 | 234 | 232 | 292 | 360 | 338 | 1042 | 1149 | 731 | 1634 | 1149 | 731 | 731 | 941 | 862 | 338 | 448 | 375 | 338 | 448 |
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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