Surf Forecasts:
21st Street (Miami) surf forecast from 18 Aug 2026:
- Most powerful swell: Tuesday 25 Aug, 8AM (local time) - 2.5ft (0.7m), 4s period, SE swell with 17 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 0.7m 4s and forecast to arrive on Tuesday (Aug 25) at 8AM. 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 Monday (Aug 24) at 8PM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8AM (Tue 25th Aug) | 2.5ft (0.7m) 4s |
Table - best surf conditions forecast for 21st Street (Miami) over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s talk about what we’ve got on the home front for the next couple of weeks. Honestly, looking at the charts for 21st Street (Miami), it’s a tough stretch. We’ve got a long gap of poor conditions right from the start. The whole run is a grind, and there’s really nothing that gets me shouting from the beach. The water temp is sitting at a warm 87°, which is about a degree and a half warmer than average for this time of year, so it’s a touch toastier than usual, but that’s about the only highlight.
The first week is a write-off. We’re looking at tiny, weak energy – that combined swell energy barely ever cracks the teens (weak energy at 11). Swell heights are stuck around 0.7ft to 2ft, and mostly coming from the east with short periods. The winds are consistently onshore or cross-onshore, chopping up an already sad little wave. Even on the few mornings like Thursday the 20th or Friday the 21st when the wind goes light, that 0.7ft of east swell just isn't enough to surf. It’s a flat spell.
We’ve got a bit more energy moving in around the 26th of August, with the combined swell energy hitting 29, but it’s still weak and the swell is only 0.7ft with a period of 15 seconds. That long period is actually a bit cruel – it’ll just make the tiny waves fat and straight at a beach break like this. Not worth paddling out for.
The one little flicker of something happens on the 2nd of September, which is next week. We finally see the swell push up to a consistent 3ft from the ESE with a period of just 4 seconds. The combined energy hits 49, so it’s still in the weak range, but it’s the biggest we get. The morning of the 2nd has a light cross-onshore breeze, so it’ll be small but rideable for a log. The swell direction is also the closest we get to the optimum NNE. This is the best option on offer by a long shot, but it’s nothing to get excited about. Still, it’s a date to mark on the calendar. For the rest, kites might have more fun than us paddle folk on those afternoon sea breezes.
Rusty.
Short Range ForecastModerate rain (total 12mm), heaviest on Thu night. Warm (max 33°C on Tue afternoon, min 28°C on Wed morning). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 4mm), mostly falling on Sun morning. Warm (max 30°C on Sat afternoon, min 28°C on Fri morning). Wind will be generally light. | ||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | |||||||||||||||
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 8 | E 10 | E 10 | E 9 | E 9 | E 9 | E 8 | S 4 | E 8 | E 8 | E 8 | E 8 | E 9 | E 8 | E 8 | ESE 4 | SE 4 | SE 4 | SE 4 | SSE 4 | ESE 4 |
Wave Graph  | |||||||||||||||||||||
 kJ | 6 | 8 | 8 | 7 | 6 | 6 | 6 | 14 | 6 | 6 | 6 | 6 | 6 | 6 | 5 | 6 | 12 | 8 | 8 | 13 | 11 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | cross-off | cross-off | cross-on | off | cross-off | cross | cross | cross-off | cross | cross | cross-on | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 1:19PM0.78m | 1:22AM0.74m | 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 | ||||||||
Low Tide | 7:22PM0.18m | 7:44AM0.09m | 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 | ||||||||
 | |  | | | |  |  |  | | | | | | | | | | | | | |
 | 6:54 | — | — | 6:54 | — | — | 6:54 | — | — | 6:54 | — | — | 6:56 | — | — | 6:56 | — | — | 6:56 | — | — |
 | — | 7:52 | — | — | 7:52 | — | — | 7:52 | — | — | 7:51 | — | — | 7:50 | — | — | 7:49 | — | — | 7:47 | — |
mm | — | — | — | — | — | — | — | 1 | 11 | — | — | — | — | — | — | 2 | — | 2 | 3 | — | 1 |
Temp °C | 31 | 33 | 31 | 30 | 32 | 32 | 31 | 31 | 30 | 29 | 29 | 29 | 29 | 30 | 29 | 29 | 29 | 29 | 29 | 29 | 29 |
Feels °C | 33 | 35 | 33 | 32 | 34 | 34 | 35 | 32 | 32 | 32 | 31 | 31 | 33 | 31 | 32 | 32 | 31 | 32 | 31 | 31 | 31 |
Swell 1 Height (m) Direction Period (s) | E 8 | E 10 | SSE 4 | E 9 | E 9 | E 9 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 9 | E 8 | E 3 | ESE 4 | E 8 | E 8 | E 8 | E 8 | NE 8 |
| kJ | 6 | 8 | 2 | 7 | 6 | 6 | 6 | 6 | 6 | 6 | 5 | 6 | 6 | 6 | 1 | 6 | 1 | 1 | 1 | 1 | 2 |
Swell 2 Height (m) Direction Period (s) | NE 9 | NE 11 | E 10 | NE 5 | NE 6 | NE 6 | NE 6 | NE 9 | NE 9 | NE 9 | NE 8 | NE 9 | — | NE 9 | E 8 | E 8 | NE 9 | NE 8 | NE 8 | NE 8 | E 11 |
| kJ | 3 | 4 | 8 | 1 | 1 | 1 | 1 | 3 | 3 | 3 | 2 | 3 | — | 3 | 5 | 1 | 3 | 3 | 3 | 3 | 2 |
Swell 3 Height (m) Direction Period (s) | E 11 | N 6 | NE 6 | NE 10 | NE 9 | — | NE 9 | NE 6 | — | N 9 | — | E 14 | NE 9 | E 13 | NE 9 | NE 9 | E 12 | E 12 | E 11 | E 11 | NE 8 |
| kJ | 2 | 1 | 1 | 4 | 3 | — | 3 | 1 | — | 2 | — | 4 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 2 | 2 |
Wind waves Height (m) Direction Period (s) | — | ESE 2 | — | NNW 2 | ESE 3 | S 3 | S 3 | S 4 | S 3 | S 3 | SSE 3 | SSE 4 | — | SE 3 | SSE 3 | S 3 | SE 4 | SE 4 | SE 4 | SSE 4 | ESE 4 |
| kJ | — | 1 | — | 1 | 3 | 3 | 1 | 14 | 5 | 3 | 6 | 3 | — | 2 | 1 | 1 | 12 | 8 | 8 | 13 | 11 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 324 | 353 | 314 | 324 | 324 | 375 | 407 | 407 | 731 | 1634 | 1671 | 731 | 1210 | 365 | 448 | 234 | 731 | 236 | 234 | 1494 | 394 |
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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