Surf Forecasts:
21st Street (Miami) surf forecast from 13 Aug 2026:
- Most powerful swell: Tuesday 18 Aug, 5PM (local time) - 1ft (0.3m), 12s period, E swell with 24 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 0.3m 12s and forecast to arrive on Tuesday (Aug 18) at 5PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 5s period and expected on Saturday (Aug 15) at 5PM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5PM (Tue 18th Aug) | 1ft (0.3m) 12s |
Table - best surf conditions forecast for 21st Street (Miami) over the next 16 days.
The Lowdown
Alright, Rusty here. Let's have a look at what’s cookin’ for Miami.
Honestly, mate, it’s a flat spell. The outlook over the whole 16 days is a tough one for surfers around 21st Street (Miami). The water temp is sittin' at about 87°F, which is pretty normal for this time of year, just a touch on the warm side. But that’s where the good news ends.
We’ve got a long stretch with barely a ripple. For the first week and a half, from Thursday the 13th right through to around the 23rd, it’s just tiny, weak, and messy. The combined swell energy is next to nothing, with readings between 4 and 36—basically flat. The swell is tiny, often just 0.3ft to 1ft from the east or southeast, with short, weak periods. The wind is mostly a cross-onshore breeze, keeping any little bump chopped up. There is one tiny moment on the morning of Monday the 17th where it goes glassy with no wind at all, and the swell is a pathetic 0.7ft from the east with an 8-second period. That’s not surf, that’s a mirrored lake with a faint wobble. Give it a miss.
This dead run continues day after day. The combined energy barely cracks 17 some days. It’s not worth paddling out. The 21st Street break is inconsistent at the best of times, and this forecast is a perfect example of that.
There’s a glimmer very late in the window. Around the 26th and 27th of August, we see a slight bump. The combined energy climbs into the 30s and even 46 on the morning of the 27th. The swell picks up to about 3ft from the east-southeast with a period of just 4 to 5 seconds—short period windswell. The winds stay onshore, but light. It’s not inspiring.
If you really need to get wet, the best of a poor lot would be Thursday morning, August 27th. The swell is 3ft from the east-southeast with an energy reading of 46—still weak but the highest of the run. The wind is a gentle onshore breeze from the east-southeast. The water will be clean-ish, but the period is short (5 seconds) so the waves will be soft and crumbly. It’s an intermediate wave at best, but with no power or push. Not a standout, just the least terrible option two weeks out.
For the rest of it, honestly, if it’s kiting you’re into, the consistent chop and steady breeze might get you moving, but for a surfboard, this is a wipeout. Keep the board in the car and hope the long-range models change.
Rusty.
Short Range ForecastModerate rain (total 10mm), heaviest on Fri night. Warm (max 30°C on Thu afternoon, min 28°C on Sat morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 30°C on Sun afternoon, min 28°C on Sun morning). Wind will be generally light. | ||||||||||||||||||||
Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | |||||||||||||||
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) | NE 8 | ESE 3 | SE 3 | SE 4 | E 4 | ESE 4 | SE 4 | E 8 | SE 5 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 12 | E 11 | E 10 | E 10 | ESE 4 |
Wave Graph  | |||||||||||||||||||||
 kJ | 3 | 3 | 3 | 4 | 3 | 10 | 19 | 6 | 19 | 5 | 5 | 5 | 5 | 5 | 5 | 6 | 24 | 20 | 8 | 7 | 8 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross | glassy | cross-on | cross-off | cross-on | cross-on | cross | cross-on | cross-on | cross-on |
High Tide | 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 | 1:19PM0.78m | 1:22AM0.74m | 2:12PM0.74m | 2:10AM0.69m | |||||||
Low Tide | 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 | 6:57AM0.04m | 7:22PM0.18m | 7:44AM0.09m | 8:14PM0.24m | ||||||||
 |  |  | | |  | | |  | | | | | | | | | | | | | |
 | 6:52 | — | — | 6:52 | — | — | 6:52 | — | — | 6:52 | — | — | 6:54 | — | — | 6:54 | — | — | 6:54 | — | — |
 | — | 7:58 | — | — | 7:57 | — | — | 7:55 | — | — | 7:54 | — | — | 7:53 | — | — | 7:52 | — | — | 7:52 | — |
mm | — | — | 2 | — | — | 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 29 | 30 | 29 | 29 | 30 | 29 | 28 | 29 | 29 | 29 | 30 | 29 | 29 | 30 | 30 | 29 | 30 | 29 | 29 | 29 | 29 |
Feels °C | 34 | 32 | 32 | 32 | 33 | 31 | 28 | 31 | 31 | 32 | 32 | 30 | 33 | 32 | 33 | 33 | 32 | 32 | 31 | 31 | 31 |
Swell 1 Height (m) Direction Period (s) | — | E 7 | E 7 | E 7 | SSE 4 | NE 13 | NE 12 | S 5 | E 7 | SSE 4 | SSE 5 | SSE 5 | E 8 | E 8 | E 8 | E 8 | E 12 | E 11 | SE 3 | E 10 | E 9 |
| kJ | — | 1 | 1 | 1 | 1 | 7 | 6 | 12 | 4 | 7 | 9 | 5 | 5 | 5 | 5 | 6 | 24 | 20 | 2 | 7 | 6 |
Swell 2 Height (m) Direction Period (s) | E 7 | — | NE 9 | NE 9 | E 7 | NE 9 | E 8 | E 8 | NE 11 | E 4 | E 8 | E 8 | SSE 4 | NE 9 | NE 9 | E 12 | NE 6 | NE 6 | E 10 | NE 8 | NE 7 |
| kJ | 1 | — | 3 | 3 | 1 | 3 | 1 | 4 | 5 | 3 | 5 | 5 | 2 | 3 | 3 | 3 | 1 | 1 | 8 | 2 | 2 |
Swell 3 Height (m) Direction Period (s) | NE 8 | NE 8 | — | E 9 | NE 9 | N 9 | NE 9 | NE 12 | — | E 8 | NE 10 | NE 10 | NE 10 | — | E 14 | NE 7 | NE 12 | NE 9 | NE 8 | NE 10 | NE 9 |
| kJ | 3 | 3 | — | 2 | 3 | 2 | 3 | 5 | — | 5 | 4 | 4 | 4 | — | 4 | 2 | 6 | 3 | 3 | 4 | 3 |
Wind waves Height (m) Direction Period (s) | — | ESE 3 | SE 3 | SE 4 | E 4 | ESE 4 | SE 4 | E 4 | SE 5 | — | ESE 3 | — | — | SE 3 | SSE 2 | SSE 3 | SE 3 | SE 3 | — | ESE 3 | ESE 4 |
| kJ | — | 1 | 3 | 4 | 2 | 10 | 19 | 6 | 19 | — | 2 | — | — | 2 | 1 | 1 | 2 | 3 | — | 4 | 8 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1634 | 1562 | 915 | 1560 | 1677 | 915 | 1293 | 1149 | 236 | 314 | 324 | 324 | 324 | 314 | 314 | 234 | 254 | 213 | 232 | 925 | 360 |
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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