Partly cloudy, high near 80°. No real rain risk. All-day beach window.
forecastRain OutlookOpen-Meteo
tap an hourTop rain chance is just 7% — pack the sunscreen, not the umbrella.
Tide
0.3 ft · falling ↘
Next low tide
12:24 PM 0.2 ft
T−…
1.9 ft of drop from the 7:54 AM high; the wet sand is widest from about 11:24 AM.
Wind
6 mph
from the ENE
UV Index
High
reapply every 80 min
Time to Burn
UV 6 · incl. sand glarefor unprotected fair skin (burns easily, tans a little). SPF 30+, reapply every 2 hours and after every swim.
Strongest 12 PM to 4 PM · peaks at UV 6
An estimate from the standard erythemal dose model, not a medical limit. Darker skin burns more slowly than this, people vary either way, and sunscreen only helps if you use enough of it and reapply.
Rip Current Riskestimated
todayCurrents strong enough to pull swimmers offshore. Stay near a lifeguard tower.
Caught in one? Don’t fight it. Swim parallel to the beach until you’re free, then angle back in.
Beach Flag
Yellow Flag
stay close to shore
estimated · trust the lifeguard
Red Tide
Checking…
asking FWC
Stingers & Biters
modelled, not observedBased on wind, water temperature and humidity. Nobody publishes a live count, so this is what conditions favour today.
No-see-umsPossible
Light 6 mph wind and humid air around sunset. 415 acres of marsh and mangrove sit behind this beach.
They bite worst in the last hour of light. Repellent with picaridin or DEET, and a breeze is your friend.
Water Quality
bacteria testingWater here is sampled by the Florida Healthy Beaches Program at the Key Biscayne Beach station (0.8 km from the beach centre). We do not restate the result, because the state publishes it only on its own page and a stale copy here could be wrong about today.
Today’s official resultSource: Florida Department of Health
Sargassum WatchNOAA satellite
seaweed outlookLatest 7-day NOAA satellite composite detects light sargassum offshore. Some may drift onto the beach. Offshore satellite estimate only — on-the-ground conditions may differ.
Water by Monthtypical
avg 2021–2024Warmest around July (90°), coolest around January (73°).
surf’s up (gently)
Tides are NOAA predictions (Key Biscayne station 8723214); temps, wind, UV, waves and water temp are live from Open-Meteo; rip current risk from the NWS surf-zone forecast; red tide from FWC sampling. Flag status is estimated from wave height and wind, so always trust the lifeguard’s actual flag over this app.
The water at Key Biscayne is 82°F (28°C) today, about normal for October. For swimming it is warm. Waves are 2–3 ft (moderate). The air is 80°F, feeling like 86°F, with breezy 11 mph winds from the ENE. The UV index reaches 6 (high), strongest from 1 PM to 3 PM. The National Weather Service rip current risk is high.
The water holds steady around 82°F through Wed Nov 4.
The week ahead at Key Biscayne, day by day: the sky, the high, the strongest wind and the biggest waves, the UV peak and the daytime chance of rain, and the water temperature. The calmest day for a swim looks like Fri Oct 30.
| Day | Sky | High | Wind | Waves | UV | Rain | Water |
|---|---|---|---|---|---|---|---|
| Today | Cloudy | 80°F | 14 mph | 2.4 ft | 6 | 6% | 82°F |
| Fri Oct 30 | Drizzle | 81°F | 12 mph | 2.1 ft | 6 | 24% | 82°F |
| Sat Oct 31 | Showers | 83°F | 15 mph | 2.9 ft | 6 | 53% | 82°F |
| Sun Nov 1 | Thunderstorms | 82°F | 18 mph | 3 ft | 6 | 71% | 82°F |
| Mon Nov 2 | Thunderstorms | 80°F | 18 mph | 3.1 ft | 6 | 53% | 82°F |
| Tue Nov 3 | Drizzle | 83°F | 12 mph | 3.1 ft | 6 | 17% | 83°F |
| Wed Nov 4 | Drizzle | 81°F | 10 mph | 3.5 ft | 5 | 10% | 83°F |
High and low tides for the next 7 days, from NOAA’s predictions for tide station 8723214. Heights are in feet above the average low tide. The shell window is the last hour and a quarter of the ebb and the first three-quarters of the flood around the day’s lowest daylight low, when the most sand is bare; the lowest low of the week is marked.
| Day | Tide 1 | Tide 2 | Tide 3 | Tide 4 | Shell window |
|---|---|---|---|---|---|
| Today | Low 5:36 AM 0.2 | High 12:11 PM 2.9 | Low 6:08 PM 0.7 | — | 4:53 PM–6:53 PM |
| Fri Oct 30 | High 12:16 AM 2.7 | Low 6:34 AM 0.3 | High 1:07 PM 2.8 | Low 7:09 PM 0.8 | 5:54 PM–7:54 PM |
| Sat Oct 31 | High 1:16 AM 2.6 | Low 7:39 AM 0.4 | High 2:05 PM 2.7 | Low 8:14 PM 0.8 | 6:24 AM–8:24 AM · best |
| Sun Nov 1 | High 1:20 AM 2.6 | Low 7:44 AM 0.5 | High 2:04 PM 2.6 | Low 8:18 PM 0.8 | 6:29 AM–8:29 AM |
| Mon Nov 2 | High 2:26 AM 2.5 | Low 8:48 AM 0.6 | High 3:04 PM 2.6 | Low 9:22 PM 0.7 | 7:33 AM–9:33 AM |
| Tue Nov 3 | High 3:33 AM 2.5 | Low 9:52 AM 0.6 | High 4:05 PM 2.6 | Low 10:23 PM 0.6 | 8:37 AM–10:37 AM |
| Wed Nov 4 | High 4:38 AM 2.6 | Low 10:52 AM 0.6 | High 5:01 PM 2.6 | Low 11:19 PM 0.5 | 9:37 AM–11:37 AM |
The average sea temperature at Key Biscayne for each month (2021–2024). The water is warmest in July (90°F) and coolest in January (73°F). It averages 74°F or warmer, comfortable for most swimmers, in February, March, April, May, June, July, August, September, October, November, December.
| Month | Water °F | Water °C | For swimming |
|---|---|---|---|
| January | 73°F | 23°C | Cool |
| February | 75°F | 24°C | Comfortable |
| March | 78°F | 25°C | Comfortable |
| April | 79°F | 26°C | Comfortable |
| May | 84°F | 29°C | Warm |
| June | 86°F | 30°C | Very warm |
| July | 90°F | 32°C | Very warm |
| August | 89°F | 31°C | Very warm |
| September | 87°F | 31°C | Very warm |
| October (now) | 83°F | 28°C | Warm |
| November | 79°F | 26°C | Comfortable |
| December | 76°F | 24°C | Comfortable |
Rip currents. Today’s National Weather Service rip current risk is high. If a current pulls you away from shore, don’t fight it: swim parallel to the beach until you are out of it, then swim back in. If you can’t, float and wave for help.
Sun. The UV index peaks at 6 today, when unprotected fair skin burns in about 23 minutes. Wear SPF 30 or higher, reapply every two hours and after swimming, and find shade in the middle of the day.
Red tide. Florida's state sampling (FWC) has flagged nothing near Key Biscayne this week. Red tide can make you cough and sting your eyes near the water.
Seaweed. The NOAA satellite shows light sargassum offshore.
Water quality. Water at Key Biscayne is sampled by the Florida Healthy Beaches Program at the Key Biscayne Beach station. Official sampling results →
Dogs. Dogs are not allowed on this beach.
Swim near a lifeguard when one is on duty, and follow the beach flags and posted signs. The Key Biscayne rules page covers dogs, alcohol, fires and more.
Under 1 ft is calm, good for small children and floating. 1–2 ft is small, fine for most swimmers. 2–4 ft is moderate: fun for bodyboarding, harder for weak swimmers. 4–6 ft is rough, and over 6 ft is dangerous for swimming. Today at Key Biscayne it’s moderate.
Under 8 mph is light and pleasant. 8–15 mph is breezy, good for kites and cooler on a hot day. 15–25 mph blows sand and whips up the water. Over 25 mph most people pack up. Today at Key Biscayne it’s breezy.
0–2 is low, 3–5 moderate, 6–7 high, 8–10 very high and 11 or more extreme. At 8 or more, fair skin can burn in under 20 minutes. The UV index is highest around midday even when it is cloudy.
Under 60°F is cold and most people want a wetsuit. 68–73°F is cool but swimmable. 74–79°F feels comfortable, and 80°F or more feels warm.
82°F (28°C), about normal for October.
At 82°F the water is warm. Waves are 2–3 ft, which is moderate. The rip current risk is high.
2–3 ft, which is moderate. The wind is 11 mph from the ENE.
High tide is at 12:11 PM, and low tide is at 5:36 AM and 6:08 PM. Times are NOAA predictions.
The UV index peaks at 6 (high). At that peak, unprotected fair skin burns in about 23 minutes. Wear SPF 30 or higher, reapply every two hours and after swimming, and find shade in the middle of the day.
The National Weather Service rates the rip current risk at Key Biscayne high today. If a current pulls you out, swim parallel to the shore until you are out of it, then swim back in.
Florida's state sampling (FWC) has flagged nothing near Key Biscayne this week.
The NOAA satellite shows light sargassum offshore.
Highs run 80–83°F over the next 7 days. Rain is likely on Sat Oct 31, Sun Nov 1 and Mon Nov 2. The calmest day for a swim looks like Fri Oct 30.
The water at Key Biscayne averages about 83°F (28°C) in October.
July is the warmest month, averaging 90°F. January is the coolest, at 73°F.
The water averages 74°F or warmer from February, March, April, May, June, July, August, September, October, November and December. July is the warmest, at 90°F.
The usual water temperature in October at the nearest beaches. Tap one for its live conditions.
| Crandon Park conditions | 2 mi | 83°F |
|---|---|---|
| South Beach Miami conditions | 7 mi | 83°F |
| Sunny Isles Beach conditions | 17 mi | 83°F |
| Hollywood Beach conditions | 23 mi | 84°F |
| Dania Beach conditions | 26 mi | 84°F |
| Fort Lauderdale Beach conditions | 31 mi | 84°F |
More for Key Biscayne: parking · sunset time tonight · things to do · US water temperatures today →