Surf Forecasts:
21st Street (Miami) surf forecast from 19 Aug 2026:
- Most powerful swell: Wednesday 26 Aug, 5AM (local time) - 3ft (0.9m), 4s period, SE swell with 27 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 4s and forecast to arrive on Wednesday (Aug 26) 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 5s period and expected on Tuesday (Aug 25) at 8PM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5AM (Wed 26th Aug) | 3ft (0.9m) 4s |
Table - best surf conditions forecast for 21st Street (Miami) over the next 16 days.
The Lowdown
Alright folks, Rusty here again. Let’s be real – the next two and a bit weeks are a total bust for surf.
From August 19th all the way to September 3rd, there’s nothing worth chasing. The only spot we’ve got info on is 21st Street (Miami). It’s an inconsistent break, and it’s just not firing. The water temps are around 87°, which is a touch warmer than normal, so the swim’s good, but the surf’s dead.
Wednesday the 19th shows a tiny 0.7ft swell from the east, period of 9 seconds. The wave energy is weak (combined energy of 8). Morning winds are light and cross-off, so it’s clean, but there’s nothing to ride. Afternoon gets choppy with a moderate cross-onshore.
Thursday the 20th has a 0.7ft swell in the morning, clean again, but no size. The afternoon bumps to 2ft from the south with a period of only 3 seconds – total junk. Friday, Saturday, Sunday… all the same story: 0.7ft from the east, clean mornings, choppy afternoons, zero surfable waves.
As we roll into late August and early September, nothing changes. The biggest swell we see is 2ft with a short period, and the combined energy stays below 100. Winds are mostly onshore or cross-on, keeping it messy. A couple of glassy mornings on the 22nd and 30th, but with no swell, it’s a flat calm.
There’s a hint of longer period around September 2nd and 3rd, with 10–11 second intervals on a 1ft easterly swell. The energy climbs into the mid-30s, but 1ft waves with that period aren’t going to get you anywhere.
So I’ll say it plain: this is a long, flat run. No surf in sight. Leave the board at home, and maybe the forecasts will flip later, but for now, it’s a total washout.
Rusty.
Short Range ForecastHeavy rain (total 22mm), heaviest during Thu night. Warm (max 32°C on Wed afternoon, min 28°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 20mm), heaviest during Sun morning. Warm (max 30°C on Sat afternoon, min 28°C on Sat morning). Wind will be generally light. | ||||||||||||||||||||
Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | |||||||||||||||
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 9 | E 9 | E 9 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 9 | E 8 | E 8 | E 8 | E 12 | SE 4 | SE 4 | SE 4 | ESE 4 | ESE 4 | ESE 4 | ESE 4 |
Wave Graph  | |||||||||||||||||||||
 kJ | 7 | 6 | 6 | 6 | 6 | 6 | 5 | 5 | 5 | 6 | 6 | 5 | 5 | 4 | 5 | 4 | 5 | 8 | 11 | 11 | 21 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | cross-off | cross | cross | cross | cross-off | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross-on |
High Tide | 2:12PM0.74m | 2:10AM0.69m | 3:11PM0.71m | 3:05AM0.66m | 4:14PM0.70m | 4:07AM0.65m | 5:15PM0.71m | 5:10AM0.66m | 6:09PM0.74m | 6:07AM0.69m | 6:55PM0.77m | 6:56AM0.73m | 7:35PM0.81m | ||||||||
Low Tide | 8:14PM0.24m | 8:36AM0.13m | 9:13PM0.28m | 9:34AM0.16m | 10:18PM0.30m | 10:35AM0.16m | 11:21PM0.29m | 11:33AM0.15m | 00:16AM0.26m | 12:25PM0.13m | 1:02AM0.22m | 1:11PM0.10m | 1:42AM0.17m | ||||||||
 |  |  |  |  | | | | | | | | | | | | | | | |  | |
 | 6:54 | — | — | 6:54 | — | — | 6:54 | — | — | 6:56 | — | — | 6:56 | — | — | 6:56 | — | — | 6:56 | — | — |
 | — | 7:52 | — | — | 7:52 | — | — | 7:51 | — | — | 7:50 | — | — | 7:49 | — | — | 7:47 | — | — | 7:46 | — |
mm | — | — | 2 | 1 | 3 | 14 | — | 1 | 1 | 2 | 1 | 2 | 3 | 3 | 3 | 3 | 1 | 2 | — | 1 | 1 |
Temp °C | 31 | 32 | 30 | 30 | 31 | 30 | 30 | 30 | 29 | 29 | 30 | 29 | 29 | 30 | 29 | 29 | 29 | 29 | 29 | 30 | 29 |
Feels °C | 34 | 34 | 31 | 33 | 32 | 33 | 33 | 31 | 32 | 33 | 32 | 32 | 30 | 31 | 31 | 31 | 31 | 31 | 31 | 32 | 31 |
Swell 1 Height (m) Direction Period (s) | E 9 | E 9 | E 9 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | SSE 3 | E 8 | E 8 | E 4 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 7 | E 7 |
| kJ | 7 | 6 | 6 | 6 | 6 | 6 | 5 | 5 | 5 | 1 | 6 | 5 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
Swell 2 Height (m) Direction Period (s) | NE 6 | NE 6 | NE 6 | — | NE 9 | NE 9 | NE 9 | NE 8 | NE 9 | E 9 | NE 9 | — | E 8 | NE 9 | NE 8 | NE 8 | NE 8 | NE 8 | NE 8 | NE 8 | NE 8 |
| kJ | 1 | 1 | 1 | — | 3 | 3 | 3 | 2 | 3 | 6 | 3 | — | 5 | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 2 |
Swell 3 Height (m) Direction Period (s) | — | NE 9 | — | NE 6 | NE 6 | — | — | — | E 14 | NE 10 | E 13 | NE 9 | — | E 12 | E 12 | E 11 | E 11 | E 11 | E 11 | E 11 | E 10 |
| kJ | — | 3 | — | 1 | 1 | — | — | — | 4 | 4 | 3 | 3 | — | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 2 |
Wind waves Height (m) Direction Period (s) | — | ESE 3 | S 3 | — | SSE 3 | S 3 | S 3 | S 3 | SSE 3 | — | SE 3 | SSE 3 | SSE 3 | SE 3 | SE 4 | SE 4 | SE 4 | ESE 4 | ESE 4 | ESE 4 | ESE 4 |
| kJ | — | 1 | 1 | — | 6 | 3 | 3 | 5 | 1 | — | 5 | 2 | 1 | 4 | 5 | 4 | 5 | 8 | 11 | 11 | 21 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 324 | 324 | 353 | 407 | 731 | 731 | 1459 | 731 | 606 | 314 | 353 | 448 | 731 | 991 | 731 | 728 | 1634 | 394 | 448 | 731 | 427 |
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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