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Using our statistical data for 7000 spots dating back to 2006, we can find those waves that break the most, with the best winds.
Surf Forecasts:
Portsea Back Beach surfForecast / VIC – Mornington Peninsula / Australia
48hr Weather and Surf, issued 4 am Thursday 18 Dec 2025 AEDTForecast update in hr min s Forecast update imminent
Portsea Back Beach surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Portsea Back Beach sea temperature is
16.0° C
(Which is normal for this time of year)How big are the waves at Portsea Back Beach today?
The current surf forecast for Portsea Back Beach at 12PM is: 0.8m 11s primary swell from a Southwest direction and 0.4m 13s secondary swell from a Southwest direction (forecast issued at 04:00am December 18). The wind direction is predicted to be cross-offshore and the swell rating is 2.
| Time (AEDT) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 Dec) | 2.5ft (0.8m) | 10s |
| Afternoon (18 Dec) | 2.5ft (0.8m) | 11s |
| Evening (18 Dec) | 2.5ft (0.8m) | 11s |
Table - waves today at Portsea Back Beach. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Thursday 18 | Friday 19 | Saturday 20 | ||||||||||||||||||||||
| 2 AM | 5 AM | 8 AM | 11 AM | 2 PM | 5 PM | 8 PM | 11 PM | 2 AM | 5 AM | 8 AM | 11 AM | 2 PM | 5 PM | 8 PM | 11 PM | 2 AM | 5 AM | 8 AM | 11 AM | 2 PM | 5 PM | 8 PM | 11 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    | |||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 9 | 10 | 10 | 10 | 11 | 11 | 11 | 13 | 13 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 11 | 10 | 10 | 10 | 10 | 6 | 6 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 84 | 108 | 136 | 156 | 198 | 153 | 155 | 173 | 277 | 291 | 248 | 240 | 224 | 217 | 205 | 194 | 187 | 134 | 87 | 84 | 80 | 61 | 88 | 74 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | glass | cross- off | cross- off | cross- off | cross- on | cross | cross- off | glass | cross- off | cross- off | on | cross- on | cross | cross- on | off | on | on | on | cross- on | cross- on | cross- on | cross- on | cross- on | cross |
High Tide / height (m) | 11:19PM 1.22 | 10:05AM 1.17 | 12:18AM 1.28 | 10:59AM 1.15 | 1:08AM 1.35 | 11:53AM 1.14 | ||||||||||||||||||
Low Tide / height (m) | 4:47AM 0.85 | 5:03PM 0.33 | 6:01AM 0.84 | 5:53PM 0.28 | 7:05AM 0.79 | 6:41PM 0.23 | ||||||||||||||||||
Thursday 18 | Friday 19 | Saturday 20 | ||||||||||||||||||||||
| Sunrise | - | - | 5:52 | - | - | - | - | - | - | - | 5:52 | - | - | - | - | - | - | - | 5:52 | - | - | - | - | - |
| Sunset | - | - | - | - | - | - | 8:42 | - | - | - | - | - | - | - | 8:43 | - | - | - | - | - | - | - | 8:43 | - |
 | |  | | | | |  | |  |  |  | | | | | | | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 21 | 19 | 20 | 29 | 25 | 22 | 24 | 23 | 22 | 22 | 22 | 22 | 25 | 23 | 23 | 20 | 17 | 15 | 14 | 16 | 14 | 14 | 14 | 14 |
| Feels °C (?) | 20 | 17 | 17 | 26 | 20 | 17 | 22 | 22 | 19 | 19 | 20 | 19 | 22 | 20 | 18 | 19 | 16 | 12 | 11 | 13 | 9 | 8 | 10 | 11 |
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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