Surf Forecasts:
21st Street (Miami) surf forecast from 15 Sep 2026:
- Most powerful swell: Thursday 17 Sep, 2PM (local time) - 4ft (1.2m), 8s period, NNE swell with 188 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 1.2m 8s and forecast to arrive on Thursday (Sep 17) at 2PM. 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 4s period and expected on Friday (Sep 18) at 8PM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2PM (Thu 17th Sep) | 4ft (1.2m) 8s |
Table - best surf conditions forecast for 21st Street (Miami) over the next 16 days.
The Lowdown
Rusty here again. Let's put this Miami outlook in feet, because I know that's how some of you think.
It's going to be a tough, flat stretch for 21st Street (Miami). We're looking at about 12 days with no real surf at all before anything shows up worth mentioning. Nothing but tiny dribbles under 2ft and onshore breezes.
Finally, on Sunday, September 27th, we get a tiny pulse. The swell will be a weak 2ft from the NNE, with a so-so 10-second period. The wind will finally cooperate, going light offshore from the NNW, which will clean it right up. The call says it's "surfable but very ordinary." With this spot being inconsistent, it's the only shot we have, but don't expect more than a knee-high slosh.
After that, we have more tiny surf and junk winds. There's a bigger 4ft NNE swell showing up for Wednesday, September 30th, but there's no solid forecast for the conditions that morning yet.
Keep the board handy for that Sunday, but I wouldn't plan the day around it.
Rusty.
Short Range ForecastModerate rain (total 10mm), heaviest on Tue night. Warm (max 29°C on Mon night, min 28°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 11mm), heaviest on Fri morning. Warm (max 29°C on Thu night, min 27°C on Fri night). Wind will be generally light. | ||||||||||||||||||
Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | ||||||||||||||
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 9 | E 4 | E 8 | NNE 7 | NNE 7 | NNE 8 | NNE 8 | NE 8 | NNE 8 | NNE 8 | NNE 7 | NE 7 | ESE 5 | NE 7 | NE 7 | NE 7 | E 4 |
Wave Graph  | |||||||||||||||||||
 kJ | 6 | 6 | 6 | 6 | 5 | 86 | 157 | 138 | 157 | 128 | 74 | 50 | 37 | 27 | 21 | 14 | 13 | 7 | 6 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | on | cross-on | cross-on | on | on | on | cross-on | on | on | cross-on | on | on | cross-on | on | on | on |
High Tide | 11:16PM0.91m | 11:54AM0.91m | 11:55PM0.85m | 12:38PM0.86m | 00:37AM0.80m | 1:28PM0.81m | 1:24AM0.75m | 2:25PM0.78m | 2:22AM0.72m | 3:29PM0.77m | 3:30AM0.71m | 4:33PM0.77m | 4:39AM0.73m | ||||||
Low Tide | 5:32AM0.08m | 5:58PM0.22m | 6:13AM0.13m | 6:42PM0.28m | 6:58AM0.18m | 7:32PM0.34m | 7:48AM0.23m | 8:31PM0.37m | 8:48AM0.27m | 9:39PM0.38m | 9:55AM0.28m | 10:45PM0.37m | |||||||
 |  | |  |  | |  | | | | | |  | |  | | | | | |
 | — | 7:05 | — | — | 7:05 | — | — | 7:05 | — | — | 7:07 | — | — | 7:07 | — | — | 7:07 | — | — |
 | 7:25 | — | 7:24 | — | — | 7:22 | — | — | 7:22 | — | — | 7:21 | — | — | 7:20 | — | — | 7:19 | — |
mm | — | — | — | 4 | 1 | — | 1 | 3 | 1 | 2 | 2 | 3 | — | 1 | — | 2 | — | 1 | 8 |
Temp °C | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 29 | 29 | 28 | 29 | 29 | 29 | 29 | 28 | 28 | 29 | 29 |
Feels °C | 32 | 32 | 31 | 30 | 30 | 30 | 28 | 30 | 30 | 30 | 30 | 31 | 29 | 30 | 29 | 28 | 29 | 31 | 30 |
Swell 1 Height (m) Direction Period (s) | E 8 | E 8 | SSE 3 | E 8 | NNE 5 | NNE 7 | NNE 7 | NNE 8 | NNE 8 | NE 8 | NNE 8 | NNE 8 | NNE 7 | NE 7 | NNE 7 | NE 7 | NE 7 | NE 7 | NNE 7 |
| kJ | 6 | 6 | 1 | 6 | 4 | 86 | 157 | 138 | 157 | 128 | 74 | 50 | 37 | 27 | 21 | 14 | 13 | 7 | 5 |
Swell 2 Height (m) Direction Period (s) | NE 9 | NE 10 | E 9 | SSE 4 | E 8 | E 8 | E 8 | E 8 | — | E 8 | E 8 | E 8 | E 7 | SSE 5 | S 5 | E 7 | SSE 4 | SSE 4 | E 6 |
| kJ | 3 | 4 | 6 | 2 | 5 | 6 | 1 | 1 | — | 1 | 1 | 1 | 1 | 4 | 4 | 4 | 3 | 2 | 1 |
Swell 3 Height (m) Direction Period (s) | NE 11 | — | NE 10 | NE 10 | NE 9 | NE 9 | — | — | E 8 | — | — | E 8 | E 8 | E 7 | E 7 | E 7 | E 7 | E 8 | E 8 |
| kJ | 5 | — | 4 | 4 | 3 | 3 | — | — | 1 | — | — | 1 | 1 | 1 | 4 | 4 | 1 | 1 | 1 |
Wind waves Height (m) Direction Period (s) | — | SE 3 | E 3 | E 4 | ESE 4 | E 3 | E 4 | ESE 4 | E 3 | ESE 4 | ESE 4 | SE 4 | ESE 4 | E 4 | ESE 5 | SE 4 | E 4 | ESE 4 | E 4 |
| kJ | — | 1 | 1 | 6 | 5 | 3 | 7 | 6 | 5 | 8 | 12 | 9 | 12 | 3 | 15 | 8 | 1 | 7 | 6 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 1149 | 941 | 845 | 918 | 915 | 1149 | 338 | 338 | 1043 | 338 | 731 | 731 | 731 | 448 | 1242 | 448 | 915 | 1242 | 1149 |
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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