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Guilderton Rivermouth surfForecast / WA – Perth City / Australia

information circle12 Day Weather and Surf, issued 7 am Sunday 17 Aug 2025 AWST
Forecast update in hr  min  s Forecast update imminent
Guilderton Rivermouth surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Guilderton Rivermouth sea temperature is
18.6° C
 (Which is normal for this time of year)

Best Forecast Surf Conditions for Guilderton Rivermouth this week:

The surf forecast for Guilderton Rivermouth over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Aug 17) at 5PM. The primary swell is predicted to be 1.7m and 12s period with a secondary swell of 0.4m and 18s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Guilderton Rivermouth in the next 12 days are 4.5m 16s and forecast to arrive on Thursday (Aug 21) at 5AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Saturday (Aug 23) at 8PM.

Wave TypeTime (AWST) & Date Wave Height & Period
Next good surf (1 star+) 5PM (Sun 17th Aug)5.5ft (1.7m) 12s
Best Surf 5AM (Thu 21st Aug)15ft (4.5m) 16s
Most Powerful 5AM (Thu 21st Aug)15ft (4.5m) 16s

Table - best surf conditions forecast for Guilderton Rivermouth over the next 12 days.

Hourly12 Days
Perth City Coast Surf
Print Surf Table
Updates in  hr  min  s Forecast update imminent 

Short Range Forecast Heavy rain (total 23mm), heaviest during Tue afternoon. Very mild (max 19°C on Mon morning, min 13°C on Sun morning). Mainly fresh winds.

Days 3-6 Weather Summary Light rain (total 6mm), mostly falling on Wed morning. Very mild (max 18°C on Wed afternoon, min 10°C on Fri night). Winds decreasing (fresh winds from the W on Wed morning, calm by Fri afternoon).

Sunday
17
Monday
18
Tuesday
19
Wednesday
20
Thursday
21
Friday
22
Saturday
23
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
2
3
2
0
1
2
0
0
1
0
0
0
!
!
!
!
3
4
4
1
3
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
1.7
SW
1.7
WSW
1.5
WSW
1.8
SW
1.5
SW
1.9
SW
1.7
WSW
1.9
WSW
2.5
WSW
3
WSW
4
WSW
4.5
WSW
4.5
WSW
4.5
WSW
3.5
WSW
3
SW
2.5
SW
2.4
SW
2.1
SW
1.9
SW
1.7
SW
Period(s) (?)121213151816161514161615161616151413131312
Wave
Graph
(?)Metric surfscale
Energy (?)8378891307202224961904164118892495481914579857593628637576638203009206315211167863
Wind
(km/h)
25
ENE
20
E
15
NE
20
NNW
20
NW
20
NNW
30
W
30
NW
15
WNW
35
W
30
WSW
25
SW
15
SE
20
S
10
ESE
10
ENE
10
S
15
E
10
NE
20
S
5
SE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off		offcross-
off		cross-
on		cross-
on		crossoncross-
on		onononcross-
on		cross-
off		crossoffoffcrossoffcross-
off		crossglass
High Tide
/ height (m)
4:27AM
0.66
5:53AM
0.68
7:04AM
0.69
7:58AM
0.69
8:43AM
0.67
9:20AM
0.64
11:41PM
0.32
Low Tide
/ height (m)
3:21PM
0.04
3:48PM
0.01
4:19PM
-0.01
4:47PM
0.01
5:11PM
0.04
5:27PM
0.09
5:28PM
0.15
2:09AM
0.31
Sunday
17
Monday
18
Tuesday
19
Wednesday
20
Thursday
21
Friday
22
Saturday
23
Sunrise6:52--6:50--6:50--6:48--6:48--6:47--6:45--
Sunset-5:52--5:52--5:52--5:53--5:54--5:54--5:55-
cloudcloudpart cloudpart cloudpart cloudclearmod rainmod rainrain showersrain showersrain showersrain showerspart cloudclearclearclearclearclearclearclearrain showers
Rain (mm)
------698222--------2
Temp. °C141818191918181716171816141414141615151615
Feels °C (?)81413151515141212111110111010111411121311
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder

Eyeball surf reportRecent Eyeball Surf Reports for WA - Perth City

  1. weather stationWind Update Offshore wind has become very light (light winds from the E at Gingin Aerodrome 36 km from Guilderton Rivermouth). Surf should be turning clean at Guilderton Rivermouth. A 1.8m groundswell from the WSW

    1 hour 14 minutes ago Guilderton Rivermouth
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36 km away, 1 h 14 min ago

9 km/h
E
0.0
18.6
Air / Water (°C)
Please reload the page to see if there are any updates.

FREE! Surf-Forecast.com widget for your website

The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Guilderton Rivermouth surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.

View detailed surf forecast for Guilderton Rivermouth at:
surf-forecast.com

Information about the Guilderton Rivermouth Surf forecast

The above surf forecast table for Guilderton Rivermouth provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Guilderton Rivermouth can be found by selecting the local surf guide option on the grey menu. Our Guilderton Rivermouth 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 (Guilderton Rivermouth) 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 Guilderton Rivermouth 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.

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