Surf Forecasts:
21st Street (Miami) surf forecast from 31 Jul 2026:
- Most powerful swell: Sunday 2 Aug, 2PM (local time) - 2.5ft (0.8m), 4s period, SSE swell with 22 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 0.8m 4s and forecast to arrive on Sunday (Aug 02) at 2PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 4s period and expected on Saturday (Aug 01) at 2AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2PM (Sun 2nd Aug) | 2.5ft (0.8m) 4s |
Table - best surf conditions forecast for 21st Street (Miami) over the next 16 days.
The Lowdown
Well, folks, Rusty here. Let’s be straight with you — this is a tough one. The next 16 days for 21st Street (Miami) are looking pretty grim if you’re hoping to paddle out. We’ve got the first recommendation starting on Friday, July 31st, but honestly, it’s a rough start.
The overall pattern is a long stretch of tiny, weak, and messy surf. From Friday, July 31st right through to Saturday, August 15th, there’s not a single session that’s calling out for a board. The swell is small, mostly under 3 ft, and the period is short, often below 8 seconds, which means these are just wind slop waves, not real swell. The combined energy is weak, hovering in the double digits (3 to 48), and that’s just not enough to get excited about.
The water temperature is running at 87°F, which is about 2°F above normal for this time of year — nothing wild, just a touch warmer than average.
Now, the wind is the real killer here. For most of the period, we’re looking at cross-shore, cross-onshore, or onshore winds, often from the south or southeast, at 9 to 19 mph. That’s going to make the surface choppy and lumpy. There are a few mornings with light breezes, like on Sunday, August 9th, when we get a light cross-onshore wind at 6 mph, but the swell is still tiny (2 ft from the SE with a 4-second period), so it’s not going to offer anything worth paddling out for.
The only slight glimmer is on the mornings of Friday, August 7th and Saturday, August 8th, where the swell direction shifts to the NE with a period of 9 to 10 seconds — that’s a bit more period, but the swell height is only 1 ft, and the combined energy is still very low (45 and 36). The wind is onshore or cross-onshore, so it’s not clean. It’s a tease, not a treat.
There are no standouts here. Not a single session breaks the 3 ft mark, and the quality is consistently described as “poor surf conditions.” If you’re a kite surfer, the stronger cross-shore winds on some afternoons might get you going, but for a surfer, this is a 16-day blank. It’s just one of those stretches where the ocean’s taking a nap. Forecasts can change, so keep an eye out, but for now, I’d save the wax and wait.
Rusty.
Short Range ForecastModerate rain (total 17mm), heaviest on Sat night. Warm (max 32°C on Fri afternoon, min 28°C on Fri morning). Winds increasing (light winds from the SSW on Fri night, fresh winds from the SSE by Sat afternoon). | Days 4-6 Weather SummaryModerate rain (total 19mm), heaviest on Mon afternoon. Warm (max 31°C on Mon afternoon, min 26°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | |||||||||||||||
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 10 | SSE 3 | E 9 | E 8 | SE 3 | E 8 | SE 4 | SSE 4 | SSE 5 | E 5 | E 5 | E 7 | E 8 | ESE 3 | E 4 | ESE 4 | ESE 4 | E 4 | E 4 | E 4 | E 4 |
Wave Graph  | |||||||||||||||||||||
 kJ | 2 | 4 | 6 | 6 | 8 | 5 | 15 | 21 | 15 | 12 | 9 | 17 | 10 | 5 | 3 | 10 | 11 | 16 | 14 | 13 | 19 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross | off | cross-off | cross | cross | cross | cross | cross-on | cross | cross | cross | cross-on | cross | cross-on | cross-on | on | cross-on | cross-on | on | on |
High Tide | 10:04AM0.77m | 10:29PM0.80m | 10:44AM0.78m | 11:04PM0.80m | 11:26AM0.78m | 11:41PM0.79m | 12:11PM0.78m | 00:21AM0.77m | 1:01PM0.77m | 1:07AM0.76m | 1:58PM0.76m | 2:01AM0.74m | 3:02PM0.75m | 3:04AM0.73m | |||||||
Low Tide | 4:14PM-0.01m | 4:38AM0.03m | 4:53PM0.01m | 5:15AM0.01m | 5:33PM0.04m | 5:56AM0.00m | 6:16PM0.08m | 6:40AM-0.00m | 7:05PM0.11m | 7:31AM-0.00m | 8:01PM0.15m | 8:30AM-0.00m | 9:05PM0.17m | ||||||||
 |  |  | | | |  | | | | | |  | |  | | | | | | | |
 | 6:46 | — | — | 6:46 | — | — | 6:47 | — | — | 6:47 | — | — | 6:48 | — | — | 6:48 | — | — | 6:48 | — | — |
 | — | 8:07 | — | — | 8:06 | — | — | 8:06 | — | — | 8:05 | — | — | 8:04 | — | — | 8:04 | — | — | 8:02 | — |
mm | — | 1 | 5 | — | — | 6 | 2 | — | 3 | — | 3 | 3 | — | 4 | — | 1 | 2 | 6 | 3 | 1 | 15 |
Temp °C | 30 | 32 | 32 | 30 | 31 | 30 | 30 | 30 | 29 | 30 | 31 | 28 | 29 | 30 | 29 | 30 | 30 | 29 | 29 | 30 | 29 |
Feels °C | 32 | 33 | 35 | 32 | 32 | 31 | 31 | 31 | 32 | 31 | 30 | 29 | 31 | 32 | 31 | 31 | 31 | 30 | 30 | 31 | 30 |
Swell 1 Height (m) Direction Period (s) | E 7 | E 7 | S 4 | E 8 | E 8 | E 8 | E 8 | E 4 | E 8 | E 5 | E 5 | E 7 | E 8 | NE 8 | E 4 | E 7 | E 7 | SSE 4 | — | E 7 | E 7 |
| kJ | 1 | 1 | 4 | 6 | 5 | 5 | 5 | 3 | 5 | 12 | 8 | 17 | 10 | 2 | 3 | 4 | 4 | 2 | — | 4 | 4 |
Swell 2 Height (m) Direction Period (s) | — | E 10 | E 9 | NE 9 | NE 9 | ESE 3 | NE 8 | E 8 | NE 8 | E 8 | E 8 | NE 8 | NE 8 | S 3 | SSE 4 | NE 8 | NE 8 | E 7 | NE 8 | SSE 4 | NE 11 |
| kJ | — | 2 | 6 | 3 | 3 | 1 | 3 | 5 | 3 | 4 | 5 | 2 | 2 | 1 | 3 | 2 | 2 | 4 | 3 | 2 | 5 |
Swell 3 Height (m) Direction Period (s) | E 10 | NE 10 | NE 10 | — | — | NE 8 | NE 8 | NE 8 | E 8 | NE 8 | NE 8 | — | N 8 | NE 8 | WNW 3 | — | E 7 | E 8 | — | NE 8 | — |
| kJ | 2 | 4 | 4 | — | — | 3 | 3 | 3 | 5 | 3 | 2 | — | 1 | 3 | 2 | — | 4 | 1 | — | 3 | — |
Wind waves Height (m) Direction Period (s) | — | SSE 3 | — | SSE 3 | SE 3 | S 3 | SE 4 | SSE 4 | SSE 5 | S 4 | S 4 | SSE 4 | SSE 3 | ESE 3 | NW 3 | ESE 4 | ESE 4 | E 4 | E 4 | E 4 | E 4 |
| kJ | — | 3 | — | 1 | 8 | 1 | 15 | 21 | 15 | 8 | 9 | 8 | 2 | 5 | 2 | 10 | 11 | 16 | 14 | 13 | 19 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 353 | 327 | 1137 | 915 | 324 | 234 | 448 | 269 | 282 | 234 | 448 | 234 | 234 | 1137 | 448 | 862 | 1563 | 1149 | 915 | 1137 | 338 |
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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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