Surf Forecasts:
21st Street (Miami) surf forecast from 21 Aug 2026:
- Most powerful swell: Friday 28 Aug, 5AM (local time) - 2.5ft (0.7m), 4s period, ESE swell with 18 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 Friday (Aug 28) at 5AM. 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 4s period and expected on Thursday (Aug 27) at 11AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5AM (Fri 28th Aug) | 2.5ft (0.7m) 4s |
Table - best surf conditions forecast for 21st Street (Miami) over the next 16 days.
The Lowdown
Alright, I’m looking at the 16-day window for Miami, and the honest truth is, it’s a quiet stretch. We’ve got a long gap with no real surf to speak of, so don’t be in a rush.
The first chance for anything rideable is well into the second week. The water is sitting at 88°, which is a touch warmer than normal for this time of year, so you’ll be sweating in your wetsuit if you wear one.
From Friday August 21st all the way through to the end of the month, we’re looking at tiny, weak waves. The combined energy is mostly in the single digits or low teens – that’s weak energy (9 to 38). The best of that period is a tiny 2ft to 3ft east-southeast windswell, but it’s mostly onshore or cross-onshore wind, making it choppy and messy. Not worth paddling out for.
The real highlight, if you can call it that, is a little window around the 29th and 30th of August. The swell picks up slightly to 2ft to 3ft from the east, but the period is a short 4 to 5 seconds. That’s windswell, not groundswell, so it’s weak and won’t have much push. The wind is mostly onshore or light cross-onshore, so it’ll be bumpy. The combined energy climbs to 28 to 34, still weak.
The best on offer: If you’re desperate, maybe the Saturday morning of the 29th of August at 21st Street (Miami). It’s a 2ft east-southeast swell with a 4 second period, so it’s tiny, weak, and short period. The combined energy is only 29, and it’s cross-onshore with a gentle breeze, so it’s fairly choppy. This spot is inconsistent, and crowds are often, so you’ll have company for the few small waves. Honestly, this is a scrape at best.
After that, the first week of September stays flat and tiny. The 3rd of September sees a 0.7ft east swell with a 9 second period, so it’s cleaner but basically nothing.
Bottom line: there’s a long gap of poor to no surf for the first week. The second week offers a couple of tiny, weak windows, but nothing that’s going to get your heart racing. It’s a quiet spell, so maybe check the forecast in a few days – it tends not to stay this poor for long in Miami.
Rusty.
Short Range ForecastLight rain (total 8mm), mostly falling on Fri night. Warm (max 30°C on Fri morning, min 29°C on Fri morning). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Wed night. Warm (max 30°C on Mon afternoon, min 29°C on Mon morning). Wind will be generally light. | ||||||||||||||||||||
Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | |||||||||||||||
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 8 | E 8 | E 9 | E 8 | E 8 | NE 9 | SE 4 | SE 4 | SE 4 | E 3 | ESE 4 | ESE 4 | E 4 | E 4 | ESE 4 | E 4 | E 4 | NE 16 | E 4 | E 4 |
Wave Graph  | |||||||||||||||||||||
 kJ | 5 | 5 | 6 | 6 | 6 | 5 | 3 | 6 | 10 | 5 | 3 | 4 | 8 | 4 | 9 | 9 | 4 | 14 | 10 | 8 | 14 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | cross | on | cross-on | cross-on | cross-on | cross-on | cross-on | on | on | on | cross-on | on | on | cross-on | on | on | on | on | on |
High Tide | 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 | 7:41AM0.79m | 8:12PM0.85m | 8:22AM0.84m | 8:47PM0.87m | ||||||||
Low Tide | 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 | 1:54PM0.07m | 2:19AM0.12m | 2:33PM0.05m | 2:55AM0.08m | |||||||
 |  |  |  |  | | | | | | |  | | |  | | | | | | | |
 | 6:54 | — | — | 6:56 | — | — | 6:56 | — | — | 6:56 | — | — | 6:56 | — | — | 6:58 | — | — | 6:58 | — | — |
 | — | 7:51 | — | — | 7:50 | — | — | 7:49 | — | — | 7:47 | — | — | 7:46 | — | — | 7:45 | — | — | 7:45 | — |
mm | — | 2 | 2 | — | — | 1 | 2 | — | 1 | — | 1 | — | — | — | — | — | — | 2 | — | — | — |
Temp °C | 30 | 30 | 29 | 29 | 30 | 29 | 29 | 30 | 29 | 29 | 30 | 29 | 29 | 29 | 29 | 29 | 30 | 29 | 29 | 30 | 29 |
Feels °C | 34 | 32 | 31 | 34 | 33 | 31 | 32 | 32 | 31 | 32 | 32 | 30 | 31 | 30 | 30 | 31 | 33 | 31 | 32 | 32 | 30 |
Swell 1 Height (m) Direction Period (s) | SSE 3 | E 8 | E 8 | E 9 | E 8 | E 8 | E 4 | E 8 | E 8 | E 8 | SSE 4 | SSE 4 | E 8 | SSE 4 | SSE 5 | E 7 | SSE 4 | — | SSE 4 | SSE 4 | SSE 5 |
| kJ | 1 | 5 | 6 | 6 | 6 | 5 | 1 | 1 | 1 | 1 | 1 | 2 | 1 | 3 | 3 | 1 | 2 | — | 7 | 4 | 3 |
Swell 2 Height (m) Direction Period (s) | E 8 | NE 8 | NE 9 | — | NE 10 | NE 9 | E 8 | NE 9 | NE 8 | NE 8 | E 8 | E 8 | NE 8 | E 8 | NE 8 | — | E 7 | — | E 8 | E 8 | E 10 |
| kJ | 5 | 2 | 3 | — | 4 | 3 | 1 | 3 | 3 | 3 | 1 | 1 | 2 | 1 | 2 | — | 1 | — | 1 | 1 | 8 |
Swell 3 Height (m) Direction Period (s) | NE 9 | — | — | NE 10 | E 13 | E 13 | NE 9 | E 12 | E 12 | E 11 | NE 8 | NE 8 | N 7 | NE 8 | N 6 | — | E 10 | — | NE 16 | NE 15 | NE 14 |
| kJ | 3 | — | — | 4 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 2 | 1 | 2 | 1 | — | 2 | — | 10 | 8 | 7 |
Wind waves Height (m) Direction Period (s) | S 3 | SSE 3 | S 4 | — | ESE 3 | SE 3 | SSE 4 | SE 4 | SE 4 | SE 4 | E 3 | ESE 4 | ESE 4 | E 4 | E 4 | ESE 4 | E 4 | E 4 | E 4 | E 4 | E 4 |
| kJ | 1 | 3 | 2 | — | 4 | 3 | 1 | 6 | 10 | 5 | 2 | 4 | 8 | 4 | 9 | 9 | 4 | 14 | 5 | 4 | 14 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 353 | 1677 | 765 | 407 | 448 | 731 | 841 | 731 | 596 | 731 | 606 | 448 | 448 | 731 | 448 | 448 | 1649 | 448 | 338 | 338 | 326 |
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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