Surf Forecasts:
21st Street (Miami) surf forecast from 25 Aug 2026:
- Most powerful swell: Monday 31 Aug, 8AM (local time) - 2.5ft (0.8m), 4s period, ESE 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 8AM. 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 5s period and expected on Thursday (Aug 27) at 8PM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8AM (Mon 31st Aug) | 2.5ft (0.8m) 4s |
Table - best surf conditions forecast for 21st Street (Miami) over the next 16 days.
The Lowdown
Well, I gotta be straight with you – the outlook for 21st Street (Miami) over this whole 16-day stretch is a pretty flat affair. Looking at the whole period, there’s just no real surf to get excited about. The water temp is sitting at 87°, which is a touch warmer than normal for this time of year, so at least the baths are warm, but the waves? They’re barely there.
The first recommendation we get is for Tuesday the 25th, and already the vibe is off. It’s clear skies in the morning, but with a 9 mph cross-on breeze from the SE and a swell height of just 0.3 ft pushing from the NE with a period of 8 seconds. The combined wave energy is a weak 5, and it’s simply poor surf conditions. It’s a flat, choppy mess. That afternoon and all through Wednesday, Thursday, and Friday it’s the same story – tiny swell, cross-on or onshore winds, and energy readings that never crack 21. It stays like this all the way through.
Honestly, there’s a long, flat gap here. From the very start through the first week and into the second, every single entry is labelled "poor surf conditions." The swell height doesn’t even break 2 ft, and most days it’s just 0.3 ft to 1.0 ft. The period is short and weak, with wind mostly cross-on or onshore. There’s no standout day, no sneaky swell, no window of clean conditions. It’s a total flop.
By the 4th of September, we get a moment of glassy wind in the morning – a 3 mph onshore breeze. But the swell is still only 1.0 ft from the E with a period of 10 seconds. The energy is 23, still weak. It might look flat and clean, but there’s no wave to ride. That’s about as good as it gets, which says it all.
To be honest, this coast is going through a blank run that’s more normal for the area. With this kind of tiny swell and persistent wind, the setup looks more interesting for a kite surfer with a big kite than a paddle surfer with a surfboard. There’s nothing here worth paddling out for.
Rusty
Short Range ForecastModerate rain (total 10mm), heaviest on Wed night. Warm (max 30°C on Tue afternoon, min 27°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 11mm), heaviest on Mon morning. Warm (max 30°C on Fri afternoon, min 29°C on Fri night). Wind will be generally light. | |||||||||||||||||||
Tue 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | ||||||||||||||
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 | SE 4 | SE 4 | SE 4 | ESE 4 | SE 4 | SE 4 | ESE 4 | ESE 4 | E 9 | E 4 | E 4 | ESE 4 | ESE 4 | ESE 4 | E 4 | E 4 | E 4 | E 4 | E 4 |
Wave Graph  | ||||||||||||||||||||
 kJ | 2 | 10 | 14 | 7 | 8 | 9 | 10 | 8 | 11 | 6 | 10 | 17 | 13 | 10 | 21 | 9 | 16 | 17 | 9 | 7 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross-on | on | on | on | on | on | cross-on | on | on | on | on | on |
High Tide | 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 | 11:02AM0.92m | 11:11PM0.89m | |||||||
Low Tide | 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 | 5:09PM0.10m | ||||||||
 |  |  |  |  | | | | | | | | | | | |  | | | | |
 | — | — | 6:58 | — | — | 6:58 | — | — | 6:58 | — | — | 6:58 | — | — | 6:58 | — | — | 7:00 | — | — |
 | 7:46 | — | — | 7:45 | — | — | 7:45 | — | — | 7:44 | — | — | 7:43 | — | — | 7:42 | — | — | 7:40 | — |
mm | — | 3 | — | 1 | 4 | — | — | 2 | — | — | 2 | — | 1 | 5 | — | — | — | 3 | 6 | 2 |
Temp °C | 30 | 29 | 29 | 30 | 29 | 30 | 30 | 29 | 30 | 30 | 29 | 29 | 30 | 30 | 29 | 30 | 29 | 29 | 30 | 29 |
Feels °C | 32 | 30 | 32 | 33 | 32 | 33 | 32 | 30 | 32 | 33 | 31 | 31 | 32 | 31 | 31 | 32 | 32 | 31 | 32 | 30 |
Swell 1 Height (m) Direction Period (s) | E 8 | E 7 | E 8 | E 7 | E 9 | E 8 | E 8 | E 8 | E 9 | SSE 4 | E 8 | E 8 | E 8 | E 8 | E 8 | SSE 4 | SSE 5 | E 7 | SE 4 | SSE 5 |
| kJ | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 1 | 6 | 3 | 5 | 5 | 5 | 5 | 5 | 7 | 5 | 4 | 4 | 5 |
Swell 2 Height (m) Direction Period (s) | NE 8 | NE 8 | — | E 10 | NE 9 | NE 8 | NE 8 | NE 14 | NE 9 | E 9 | SSE 4 | NE 11 | NE 11 | NE 11 | NE 10 | NE 10 | NE 10 | — | E 7 | E 7 |
| kJ | 2 | 2 | — | 2 | 3 | 3 | 3 | 7 | 3 | 6 | 2 | 5 | 5 | 5 | 4 | 4 | 4 | — | 4 | 4 |
Swell 3 Height (m) Direction Period (s) | N 7 | E 10 | E 10 | E 8 | — | NE 15 | NE 15 | NE 8 | NE 13 | NE 9 | NE 12 | NE 8 | NE 8 | NE 8 | — | E 8 | — | NE 10 | NE 9 | NE 9 |
| kJ | 1 | 2 | 2 | 1 | — | 9 | 8 | 3 | 7 | 3 | 6 | 3 | 3 | 2 | — | 5 | — | 4 | 3 | 3 |
Wind waves Height (m) Direction Period (s) | SE 3 | SE 4 | SE 4 | SE 4 | ESE 4 | SE 4 | SE 4 | ESE 4 | ESE 4 | E 4 | E 4 | E 4 | ESE 4 | ESE 4 | ESE 4 | E 4 | E 4 | E 4 | E 4 | E 4 |
| kJ | 2 | 10 | 14 | 7 | 8 | 7 | 10 | 8 | 11 | 4 | 10 | 17 | 13 | 10 | 21 | 9 | 16 | 17 | 9 | 7 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 1634 | 448 | 865 | 1634 | 448 | 1202 | 1634 | 234 | 232 | 517 | 841 | 915 | 1178 | 1149 | 731 | 1634 | 731 | 731 | 1634 | 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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