
Surf Forecasts:
21st Street (Miami) surf forecast from 16 Sep 2026:
- Best quality surf: Friday 18 Sep, 2PM (local time) - 2.5ft (0.8m), 8s period, NNE swell with glassy winds.
- Most powerful swell: Thursday 17 Sep, 5AM (local time) - 4.5ft (1.4m), 7s period, NE swell with 183 kJ wave energy.
- Next surfable swell (1★+): Friday 18 Sep, 2PM (local time) - 2.5ft (0.8m), 8s period with NNE swell.
Best Forecast Surf Conditions for 21st Street (Miami) this week:
The surf forecast for 21st Street (Miami) over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Sep 18) at 2PM. The primary swell is predicted to be 0.8m and 8s period with a secondary swell of 0.1m and 8s. Another secondary swell of 0.4m and 4s is also forecast. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at 21st Street (Miami) in the next 16 days are 1.4m 7s and forecast to arrive on Thursday (Sep 17) 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 0.2m 4s period and expected on Tuesday (Sep 15) at 11PM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2PM (Fri 18th Sep) | 2.5ft (0.8m) 8s |
| Best Surf | 2PM (Fri 18th Sep) | 2.5ft (0.8m) 8s |
| Most Powerful | 5AM (Thu 17th Sep) | 4.5ft (1.4m) 7s |
Table - best surf conditions forecast for 21st Street (Miami) over the next 16 days.
The Lowdown
Alright, let me tell you how it’s looking for our little stretch of coast here.
Truth be told, it’s a pretty quiet run ahead. We’ve got a long stretch of small, weak, and often messy conditions coming up. Don’t expect much in the way of proper waves for the first week and a half or so. There’s a big gap with no real recommendations until we get towards the end of the month. The only spot worth mentioning is 21st Street (Miami), and even then, it’s a waiting game. This place is inconsistent at the best of times, and the coming week looks like a write-off for decent surf.
For Tuesday the 15th through to the middle of next week, it’s mostly tiny slop. We’re looking at ankle to knee-high dribble from the east and northeast, with onshore winds messing it up. The water is sitting at a warm 87°, which is a touch warmer than usual for this time of year – feels like a bath! But don’t get your hopes up for the waves.
The first glimmer of something better shows up around Thursday the 24th. The swell starts to push up to around 5 ft from the NNE, with moderate wave energy kicking in (303). But the wind is all wrong – cross-shore, and then onshore in the afternoon – so it’ll be lumpy and hard to enjoy.
Now, Friday the 25th morning is the first real standout. We get a clean window: light cross-offshore winds from the SSW, and a solid NNE swell at 5 ft with a period of 8 seconds. The energy is strong (354). This is your best chance for a proper session. It’s not huge, but with clean conditions, 21st Street could offer some fun, rippable peaks. After that, Saturday the 26th morning also looks promising – a gentle offshore from the west with a 4 ft NNE swell (282). The wind will be clean, and it’ll be just you and the ocean.
But keep in mind, the rest of that weekend and into the following week, the wind swings around again, turning it messy or too strong. Sunday the 27th morning has a bigger swell (5 ft) and a very long period of 10 seconds, with moderate to strong energy (398), but a stiff cross-offshore wind makes it risky. That kind of groundswell period *should* mean good shape, but the wind might chop it up.
For the very end of the month, Monday the 28th also has some size, with a 5 ft NNE swell (294), but the wind is howling at 19 mph. That’s more for the experts, or for kite surfers to be honest.
So, to sum it up: there’s a long dry spell until the 25th. That Friday morning is your best bet – 5 ft NNE groundswell with light offshore wind. It’ll be clean and have some punch. Saturday morning is a close second. Anything after that is a roll of the dice with the wind. It’s a waiting game, but there might be a couple of windows to get out there.
Rusty.
Short Range ForecastModerate rain (total 16mm), heaviest on Wed morning. Warm (max 29°C on Tue afternoon, min 27°C on Thu afternoon). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 20mm), heaviest during Fri afternoon. Warm (max 29°C on Fri night, min 26°C on Fri afternoon). Wind will be generally light. | |||||||||||||||||||
Tue 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | ||||||||||||||
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 4 | E 4 | NE 5 | NNE 7 | NNE 7 | NNE 8 | NNE 8 | NNE 8 | NE 7 | NE 7 | NE 7 | NE 7 | NE 7 | NE 7 | NE 7 | NE 7 | E 4 | E 4 | NNE 8 |
Wave Graph | ||||||||||||||||||||
6 | 10 | 11 | 32 | 178 | 124 | 145 | 120 | 72 | 79 | 54 | 23 | 23 | 13 | 13 | 13 | 7 | 11 | 11 | 26 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | cross-on | on | cross-on | on | on | on | on | cross-on | on | on | on | cross-on | on | on | on | on | cross-on |
High Tide | 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 | 5:29PM0.80m | ||||||||
Low Tide | 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 | 10:59AM0.27m | 11:40PM0.33m | |||||||
— | — | 7:05 | — | — | 7:05 | — | — | 7:07 | — | — | 7:07 | — | — | 7:07 | — | — | 7:07 | — | — | |
7:24 | — | — | 7:22 | — | — | 7:22 | — | — | 7:21 | — | — | 7:20 | — | — | 7:19 | — | — | 7:17 | — | |
mm | — | 3 | 2 | — | 3 | 2 | 2 | — | 4 | 4 | 3 | 5 | — | 6 | 1 | — | 1 | — | 3 | 3 |
Temp °C | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 28 | 29 | 28 | 29 | 29 | 28 | 28 | 28 | 29 | 29 | 29 | 29 | 28 |
Feels °C | 31 | 30 | 29 | 30 | 30 | 30 | 29 | 29 | 31 | 30 | 30 | 31 | 30 | 30 | 31 | 31 | 31 | 33 | 31 | 30 |
Swell 1 Height (m) Direction Period (s) | SSE 4 | E 8 | E 8 | SE 4 | NNE 7 | NNE 7 | NNE 8 | NNE 8 | NNE 8 | SSE 4 | NE 7 | NE 7 | NE 7 | NE 7 | NE 7 | NE 7 | NE 7 | E 8 | NNE 9 | NNE 8 |
1 | 6 | 5 | 1 | 178 | 124 | 145 | 120 | 72 | 1 | 54 | 23 | 23 | 13 | 13 | 13 | 7 | 1 | 8 | 26 | |
Swell 2 Height (m) Direction Period (s) | E 9 | — | NE 9 | N 8 | E 8 | E 8 | E 8 | — | E 8 | E 8 | SSE 4 | E 12 | E 10 | E 7 | E 8 | E 8 | E 8 | — | E 8 | E 8 |
6 | — | 3 | 5 | 1 | 1 | 1 | — | 1 | 1 | 2 | 3 | 2 | 1 | 1 | 1 | 5 | — | 1 | 1 | |
Swell 3 Height (m) Direction Period (s) | NE 10 | NE 10 | — | E 8 | S 5 | — | — | E 8 | — | E 8 | E 7 | — | E 10 | E 9 | E 7 | — | — | — | — | — |
4 | 4 | — | 1 | 1 | — | — | 1 | — | 1 | 1 | — | 2 | 2 | 1 | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | E 3 | E 4 | E 4 | NE 5 | ESE 4 | ESE 4 | ESE 4 | ESE 4 | ESE 4 | NE 7 | ESE 3 | E 4 | E 3 | ESE 4 | ESE 4 | ESE 3 | E 3 | E 4 | E 4 | ENE 4 |
3 | 10 | 11 | 32 | 5 | 6 | 6 | 4 | 5 | 79 | 4 | 7 | 6 | 4 | 3 | 4 | 6 | 11 | 11 | 10 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 1634 | 918 | 941 | 1634 | 923 | 292 | 338 | 338 | 731 | 60 | 731 | 359 | 1165 | 448 | 448 | 359 | 461 | 353 | 1542 | 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.










