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Surf Forecasts:

St Marys Rivermouth surfForecast / Florida – North / USA

information circle12 Day Weather and Surf, issued 7 am Saturday 13 Sep 2025 EDT
Forecast update in hr  min  s Forecast update imminent
St Marys Rivermouth surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's St Marys Rivermouth sea temperature is
26.8° C
 (Which is 1.0°C colder than average for this time of year)

Best Forecast Surf Conditions for St Marys Rivermouth this week:

The surf forecast for St Marys Rivermouth over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Sep 17) at 11PM. The primary swell is predicted to be 0.7m and 8s period with a secondary swell of 0.1m and 9s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at St Marys Rivermouth in the next 12 days are 1.8m 8s and forecast to arrive on Saturday (Sep 13) at 2PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.2m 8s period and expected on Sunday (Sep 14) at 8PM.

Wave TypeTime (EDT) & Date Wave Height & Period
Next good surf (1 star+)11PM (Wed 17th Sep)2.5ft (0.7m) 8s
Best Surf11PM (Wed 17th Sep)2.5ft (0.7m) 8s
Most Powerful 2PM (Sat 13th Sep)6ft (1.8m) 8s

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

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
Print Table

Short Range Forecast Light rain (total 3mm), mostly falling on Sat morning. Warm (max 26°C on Mon morning, min 23°C on Sat morning). Mainly fresh winds.

Days 3-6 Weather Summary Mostly dry. Warm (max 27°C on Thu afternoon, min 25°C on Tue morning). Wind will be generally light.

Saturday
13
Sunday
14
Monday
15
Tuesday
16
Wednesday
17
Thursday
18
Friday
19
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
1.9
NE
1.7
ENE
1.3
ENE
1.3
ENE
1.2
ENE
0.9
ENE
0.9
ENE
0.7
E
0.9
ENE
1
ENE
1.2
ENE
0.9
ENE
0.7
ENE
0.7
ENE
0.6
E
0.6
E
0.4
E
0.6
E
0.7
ENE
0.9
ENE
1
E
Period(s) (?)788888899988888885546
Wave
Graph
(?)Metric surfscale
Energy kJ (?)36235620220917910210678140162194112687048462016193574
Wind
(km/h)
30
NNE
25
NE
20
NE
25
NE
20
ENE
15
ENE
20
NE
20
NE
15
NE
25
NE
20
ENE
10
E
10
NNE
15
ESE
10
SSE
10
NE
15
ENE
15
E
15
ENE
25
E
15
NE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
onononononcross-
on		onononononcross-
on		oncross-
on		cross-
off		oncross-
on		cross-
on		cross-
on		cross-
on		on
High Tide
/ height (m)
1:37PM
2.11
1:59AM
1.75
2:40PM
2.06
3:03AM
1.71
3:47PM
2.03
4:11AM
1.71
4:53PM
2.03
5:16AM
1.75
5:53PM
2.04
6:15AM
1.82
6:45PM
2.05
7:08AM
1.89
7:32PM
2.06
Low Tide
/ height (m)
8:23PM
0.32
8:29AM
0.18
9:30PM
0.37
9:34AM
0.23
10:34PM
0.37
10:38AM
0.24
11:34PM
0.35
11:41AM
0.23
12:29AM
0.30
12:39PM
0.22
1:20AM
0.26
1:33PM
0.20
2:06AM
0.21
Saturday
13
Sunday
14
Monday
15
Tuesday
16
Wednesday
17
Thursday
18
Friday
19
Sunrise7:07--7:09--7:09--7:09--7:09--7:11--7:11--
Sunset-7:34--7:32--7:30--7:30--7:29--7:27--7:25-
thunderstorm
clear
clear
clear
clear
part cloud
clear
thunderstorm
thunderstorm
clear
clear
clear
clear
clear
clear
part cloud
cloud
cloud
cloud
rain showers
part cloud
Rain (mm)
1------11----------1-
Temp. °C242425252525262525262626262626262726262524
Feels °C (?)212025232223252325242426262525272727272425
  • 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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Eyeball surf reportRecent Eyeball Surf Reports for Florida - North

  1. weather stationWind Update The wind is still cross-on at St Marys Rivermouth (light winds from the N at BUOY-FRDF1 5 km from St Marys Rivermouth). A 2.1m swell from the NE is too big for here

    1 hour 12 minutes ago St Marys Rivermouth
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1 h 12 min ago

15 km/h
N
Cross-On
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 St Marys 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 St Marys Rivermouth at:
surf-forecast.com

Information about the St Marys Rivermouth Surf forecast

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

St Marys Rivermouth is 3 km (2 miles) from Fernandina Beach. If you plan a vacation in North Florida, look for hotels and other accommodation in Fernandina Beach. Fernandina Beach has rooms for a wide range of budgets as well as car hire and transport links.

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