Beach forecast for Marion Bay
Today, Thursday, October 29, 2026 · local time (GMT+10:30) · South Australia, Australia Today, Thu, Oct 29 · GMT+10:30- Swimming
- Use care · 4.2 ft
- Water
- 64 °F · cold
- Max UV
- 9 · SPF 50
- Low tide
- 11:50 am and 9:03 pm
Today, Thursday, October 29, it's a poor beach day in Marion Bay (4/10). The best hours are from 1:00 pm to 3:00 pm: sunshine and little wind, though with some waves and very high UV. Today is the best day of the week.
Beach forecast for the next 7 days
| Day | Rating | Best hours | Swimming | Water | UV |
|---|---|---|---|---|---|
| Today | 4Poor beach day | 1:00–3:00 pm | Use care · 4.2 ft | 64 °F | 9 |
| Fri 30 | 0Not a beach day | No good window | Use care · 4.2 ft | 64 °F | 7 |
| Sat 31 | 2Not a beach day | No good window | Use care · 4.8 ft | 64 °F | 9 |
| Sun 1 | 0Not a beach day | No good window | Use care · 3.3 ft | 65 °F | 10 |
| Mon 2 | 3Poor beach day | No good window | Use care · 5.6 ft | 65 °F | 9 |
| Tue 3 | 3Poor beach day | No good window | Use care · 5.0 ft | 65 °F | — |
| Wed 4 | 0Not a beach day | No good window | Use care · 5.9 ft | 64 °F | — |
Each rating comes from sun, temperature, rain, wind, waves, UV, water temperature and, where there is one, the tide.
Today in detail
- Sunny
- Feels like 71 °F: mild
- Cross-shore breeze (9 mph)
- Swim with care: 4.2 ft waves every 12 s; moderate rip current risk
- UV 9 (very high): SPF 50 sunscreen
- Water at 64 °F (cold)
Today, hour by hour
- Swimming Use care · 4.2 ft
4.2 ft waves every 12 s: swim with care and stay where you can stand. Moderate rip current risk. Always follow the lifeguard's flags.
- Water 64 °F
Cold: ease in slowly.
- Sun & sunscreen UV 9 · SPF 50
Max UV 9 (very high): SPF 50 sunscreen, reapplied every 2 hours. Seek shade 12:00–2:00 pm (very high UV).
- Wind 9 mph
Cross-shore breeze (9 mph).
- Tide & sand 11:50 am
Low tide at 11:50 am and 9:03 pm: that's when there's the most sand. High tide at 4:13 am and 4:12 pm.
The best window, 1:00 pm to 3:00 pm, brings sunshine and little wind, though with some waves and very high UV.
We don't have data on jellyfish, sargassum or beach closures: ask the lifeguard or check with the local beach authority.
Today, hour by hour
| Time | Rating | Sky | Feels like | Wind | Waves | UV |
|---|---|---|---|---|---|---|
| 7:00 am | 0 | Clear sky | 53 °F | 8 mph | 3.9 ft | 1 |
| 8:00 am | 0 | Clear sky | 56 °F | 8 mph | 3.9 ft | 2 |
| 9:00 am | 1 | Clear sky | 59 °F | 7 mph | 3.9 ft | 3 |
| 10:00 am | 2 | Clear sky | 63 °F | 8 mph | 4.0 ft | 6 |
| 11:00 am | 4 | Clear sky | 66 °F | 8 mph | 4.1 ft | 8 |
| 12:00 pm | 4 | Clear sky | 68 °F | 9 mph | 4.1 ft | 9 |
| 1:00 pm | 5 | Clear sky | 70 °F | 9 mph | 4.2 ft | 9 |
| 2:00 pm | 4 | Clear sky | 71 °F | 9 mph | 4.2 ft | 8 |
| 3:00 pm | 4 | Clear sky | 70 °F | 8 mph | 4.3 ft | 6 |
| 4:00 pm | 3 | Clear sky | 69 °F | 7 mph | 4.3 ft | 3 |
| 5:00 pm | 2 | Mainly clear | 67 °F | 6 mph | 4.3 ft | 1 |
| 6:00 pm | 2 | Partly cloudy | 65 °F | 7 mph | 4.3 ft | 0 |
Beach hours only: from one hour after sunrise to half an hour before sunset.
Beaches near Marion Bay
Map: OpenFreeMap · © OpenMapTiles · © OpenStreetMap contributors
- Jolly Beach 1.5 mi · S
- Butterfish Bay 5.8 mi · E
Named beaches within 6.2 mi, nearest first. Amenities from OpenStreetMap: some may be missing or out of date. View on OpenStreetMap · Add or fix on OpenStreetMap
Beaches and amenities: © OpenStreetMap contributors (ODbL).
Webcams near Marion Bay
Webcams provided by windy.com — add a webcam
How we rate a beach day
We rate every beach hour from 0 to 10 with simple, fixed rules:
- Adds: sunshine (up to 3 points, fewer with more clouds), warmth (up to 4, from the feels-like temperature; ideal between 81 °F and 91 °F), a calm sea (1), water at 70 °F or warmer (1; from 64 °F, half) and low or mid tide (1: more sand). Anything without data is left out and the rest is scaled to 10.
- Takes away: cold (feels-like below 64 °F, 1 to 4 points), rain (half a point if likely, up to 6 if it rains; thunderstorms, 8), wind from force 4, about 12 mph (1 to 6 points; half a point more if offshore, which blows inflatables out to sea, or onshore, which churns the water), waves (1 to swim with care, 4 if dangerous, 1 more for high rip current risk), very high UV (half a point; extreme, 1), water below 59 °F (1) and spring high tides (1: little sand left).
- Swimming: calm, use care (waves from 2.6 ft, or long swell) or dangerous (from 6.6 ft, or 4.9 ft with a long period), based on how much of the wave reaches this shore given the way it faces. In the U.S., today's and tomorrow's rip current risk comes from the National Weather Service surf zone forecast when it issues one; otherwise we estimate it from the waves.
- Best windows: runs of 2 to 5 hours rated 4 or more and close to the best hour, at least one hour apart.
- Day rating: the average of the best window; a 2-hour window keeps 85% of it and a 3-hour window 95%.
Today, in the best window: sun 3 of 3, warmth 2 of 4, calm sea 0 of 1, water 0 of 1 and tide 0.9 of 1; minus wind 0.3, waves 1 and UV 0.3; short window: the rating keeps 85%.
It's a guide, not a guarantee: weather changes and every beach is different. Always follow the lifeguard's flags.
Questions about the beach in Marion Bay
Is it a beach day in Marion Bay today?
A poor beach day: 4/10. Best from 1:00 pm to 3:00 pm, with sunshine and little wind, though with some waves and very high UV.
What are the swimming conditions in Marion Bay today?
4.2 ft waves every 12 s: swim with care and stay where you can stand. Moderate rip current risk. Always follow the lifeguard's flags.
How warm is the water in Marion Bay?
About 64 °F today: cold. That's the sea surface temperature offshore; it can differ a little at the shoreline.
How much sun protection do I need in Marion Bay today?
UV reaches 9 (very high): SPF 50 sunscreen, sunglasses and a hat, and seek shade from 12:00 pm to 2:00 pm.
When is low tide in Marion Bay?
Today low tide is at 11:50 am and 9:03 pm: that's when there's the most sand. High tide is at 4:13 am and 4:12 pm.
What about tomorrow? Will it be a beach day in Marion Bay?
Tomorrow, Friday, October 30: not a beach day (0/10).
What beaches are near Marion Bay?
Jolly Beach (1.5 mi) and Butterfish Bay (5.8 mi). See below for amenities and water quality.
Are there jellyfish or sargassum today?
We don't know: there's no open data on jellyfish, sargassum or closures for each beach. Ask the lifeguard, check the flags or the local beach authority's website.
How is the rating worked out?
From the hourly forecast: sun and clouds, feels-like temperature, rain, wind (and whether it blows onshore or offshore), waves and their period, UV, water temperature and, where there is one, the tide. Each factor adds or takes away a fixed number of points and the rating sums them up out of 10.
More about Marion Bay today
Learn more
Our own calculation, using the Open-Meteo forecast (ECMWF, NOAA GFS, Météo-France, Copernicus Marine and CAMS, CC BY 4.0), the tide from FES2022 (AVISO/CNES) and the sun from astronomy-engine. FES2022 Tide was produced by LEGOS, NOVELTIS and CLS, funded by CNES, and distributed by AVISO (https://doi.org/10.24400/527896/a01-2024.004), AVISO licence (https://www.aviso.altimetry.fr/fileadmin/documents/data/License_Aviso.pdf). Modified by TidePlanet: constants interpolated from the nearest model cells offshore; heights above mean sea level.