Surf Forecasts:
21st Street (Miami) surf forecast from 12 Aug 2026:
- Most powerful swell: Saturday 15 Aug, 11AM (local time) - 3ft (0.9m), 5s period, SE swell with 32 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 0.9m 5s and forecast to arrive on Saturday (Aug 15) at 11AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 5s period and expected on Saturday (Aug 15) at 2PM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11AM (Sat 15th Aug) | 3ft (0.9m) 5s |
Table - best surf conditions forecast for 21st Street (Miami) over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s be straight with you—if you’re looking to paddle out around here, this is a tough stretch. The whole 16-day window is pretty much a flat spell with next to no energy. We’re talking about 21st Street (Miami), and the numbers don’t lie. The combined energy barely kicks above 40 (41 on one morning), and most days it’s sitting under 20. That’s weak, no two ways about it. The swell direction is all over the place, mostly out of the east or southeast, but the heights are tiny—best you’ll see is 3 ft on Saturday the 15th, but that’s got a short period of 5 seconds and wind from the southeast at 12 mph, so it’s cross-onshore and choppy. Not the kind of day you call in sick for.
The first week is mostly poor surf. Wednesday the 12th starts off with a 0.7 ft east swell and a 7-second period, but that weak 6 combined energy and a light cross-onshore breeze means it’s just ripples. Thursday the 13th is even smaller. Friday the 14th shows a morning 2 ft southeast swell with period 4 seconds and a gentle onshore breeze, but it’s weak. Saturday morning the 15th has the biggest swell of the whole window at 3 ft, but it’s a short-period SE windswell and moderate cross-onshore, so expect choppy, bumpy lines.
The second week stays sad. There’s a couple of moments where the wind goes light or glassy—like Tuesday the 18th morning with calm wind and glassy conditions on a 0.7 ft east swell, or Friday the 21st morning with a glassy 0.7 ft east swell—but the wave height is just too small to do anything with. Even the few clean windows, like Monday the 17th morning with a light cross-offshore breeze, only have 0.7 ft of height. It’s not surfable.
No standouts here, no hidden gems. This is a blank run, and for Miami in August, that’s not unusual. Forecasts can change, but right now, leave the board at home.
Short Range ForecastLight rain (total 3mm), mostly falling on Tue night. Warm (max 30°C on Tue night, min 28°C on Wed morning). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 6mm), mostly falling on Fri night. Warm (max 30°C on Sat afternoon, min 28°C on Sat morning). Wind will be generally light. | ||||||||||||||||||
Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | ||||||||||||||
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) | SSE 5 | E 7 | SE 3 | NE 8 | NE 8 | SE 3 | SE 3 | SE 4 | E 4 | ESE 4 | SE 5 | E 5 | SE 5 | E 8 | E 8 | E 8 | E 8 | SE 3 | E 8 |
Wave Graph  | |||||||||||||||||||
 kJ | 5 | 3 | 5 | 3 | 3 | 2 | 3 | 10 | 4 | 16 | 32 | 12 | 28 | 5 | 5 | 5 | 5 | 6 | 5 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross | cross-on | cross-on | cross-on | on | on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross | cross-off | cross | cross-off |
High Tide | 8:13PM0.92m | 8:26AM0.91m | 9:01PM0.95m | 9:18AM0.93m | 9:47PM0.95m | 10:08AM0.94m | 10:31PM0.94m | 10:55AM0.92m | 11:14PM0.90m | 11:42AM0.88m | 11:55PM0.85m | 12:30PM0.84m | 00:37AM0.80m | ||||||
Low Tide | 2:21AM-0.01m | 2:43PM-0.12m | 3:11AM-0.05m | 3:32PM-0.11m | 3:58AM-0.07m | 4:19PM-0.08m | 4:43AM-0.07m | 5:05PM-0.02m | 5:27AM-0.05m | 5:49PM0.04m | 6:12AM-0.01m | 6:35PM0.11m | |||||||
 |  |  |  | | |  | | | |  | | | | | | |  | | |
 | — | 6:50 | — | — | 6:52 | — | — | 6:52 | — | — | 6:52 | — | — | 6:52 | — | — | 6:54 | — | — |
 | 7:59 | — | 7:58 | — | — | 7:58 | — | — | 7:57 | — | — | 7:55 | — | — | 7:54 | — | — | 7:53 | — |
mm | 2 | — | — | 1 | — | — | — | — | — | 3 | 2 | — | — | — | — | — | — | 1 | 8 |
Temp °C | 30 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 30 | 29 | 28 | 30 | 29 | 28 | 29 | 29 | 30 | 30 | 29 |
Feels °C | 35 | 32 | 31 | 30 | 33 | 31 | 32 | 32 | 33 | 30 | 29 | 32 | 31 | 32 | 32 | 32 | 34 | 32 | 32 |
Swell 1 Height (m) Direction Period (s) | E 7 | SE 4 | E 7 | E 7 | E 7 | E 7 | E 7 | E 7 | SSE 4 | NE 13 | NE 12 | SSE 5 | E 7 | SSE 5 | SSE 5 | SSE 5 | E 8 | E 8 | E 8 |
| kJ | 3 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 7 | 6 | 15 | 4 | 9 | 10 | 6 | 5 | 5 | 5 |
Swell 2 Height (m) Direction Period (s) | NE 8 | E 7 | NE 9 | NE 8 | NE 8 | N 8 | NE 9 | NE 9 | E 7 | NE 9 | N 9 | NE 12 | NE 11 | E 4 | E 8 | E 8 | SSE 4 | NE 10 | NE 9 |
| kJ | 3 | 3 | 3 | 3 | 3 | 1 | 3 | 3 | 1 | 3 | 2 | 5 | 5 | 3 | 5 | 5 | 1 | 4 | 3 |
Swell 3 Height (m) Direction Period (s) | — | NE 8 | — | — | — | — | E 9 | E 9 | NE 9 | E 10 | E 9 | NE 9 | — | E 8 | NE 10 | E 3 | NE 10 | — | — |
| kJ | — | 3 | — | — | — | — | 2 | 2 | 3 | 2 | 1 | 3 | — | 5 | 4 | 1 | 4 | — | — |
Wind waves Height (m) Direction Period (s) | SSE 5 | — | SE 3 | — | SE 4 | SE 3 | SE 3 | SE 4 | E 4 | ESE 4 | SE 5 | E 5 | SE 5 | — | E 4 | — | — | SE 3 | SSE 3 |
| kJ | 5 | — | 5 | — | 1 | 2 | 3 | 10 | 4 | 16 | 32 | 12 | 28 | — | 3 | — | — | 6 | 2 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 995 | 327 | 500 | 1149 | 915 | 1560 | 1149 | 915 | 1178 | 991 | 692 | 1634 | 841 | 314 | 421 | 314 | 314 | 314 | 314 |
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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