St Marys Rivermouth surfForecast / Florida – North / USA

information circle12 Day Weather and Surf, issued 12 pm Wednesday 17 Dec 2025 EST
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
16.2° C
(Which is 5.4°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 Thursday (Dec 18) at 1AM. The primary swell is predicted to be 0.5m and 10s period with a secondary swell of 0.3m and 4s. Another secondary swell of 0.7m and 5s is also forecast. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at St Marys Rivermouth in the next 12 days are 1.9m 8s and forecast to arrive on Tuesday (Dec 23) at 4AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 7s period and expected on Thursday (Dec 18) at 10PM.

Wave TypeTime (EST) & Date Wave Height & Period
Next good surf (1 star+) 1AM (Thu 18th Dec)1.5ft (0.5m) 10s
Best Surf 1AM (Thu 18th Dec)1.5ft (0.5m) 10s
Most Powerful 4AM (Tue 23rd Dec)6ft (1.9m) 8s

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

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Some drizzle, heaviest during Thu night. Warm (max 23°C on Thu morning, min 9°C on Fri night). Wind will be generally light.

Days 3-6 Weather Summary Mostly dry. Very mild (max 18°C on Sun morning, min 13°C on Sat morning). Wind will be generally light.

Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
1
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
Swell
Height Map
Wave Height (m) & direction (?)
0.5
ESE
0.5
NE
0.5
ESE
0.4
ESE
0.4
ESE
1.4
SE
0.1
E
0.9
ESE
0.1
E
0.7
ESE
0.6
ESE
0.6
ESE
0.6
ESE
0.6
E
0.6
E
1.8
ENE
1.6
ENE
1.6
E
1.2
E
1
E
0.8
E
Period(s) (?)1031091071891599991211788879
Wave
Graph
(?)Metric surfscale
Energy kJ (?)5565229340604775961581018829530832919110694
Wind
(km/h)
10
NNE
15
NNE
5
SE
10
SSE
15
SSE
20
SSW
20
W
15
NW
15
NNW
10
NE
10
NE
5
WNW
10
NNW
10
ENE
15
NNE
25
NE
25
NNE
15
NNE
15
NNE
15
NNE
5
N
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
ononglasscross-
off
cross-
off
offcross-
off
crosscross-
on
ononglasscrosscross-
on
onononcross-
on
ononcross-
on
High Tide
/ height (m)
6:23PM
1.54
6:56AM
1.85
7:06PM
1.55
7:37AM
1.87
7:47PM
1.55
8:17AM
1.87
8:28PM
1.55
8:56AM
1.85
9:08PM
1.54
9:34AM
1.83
9:47PM
1.53
10:11AM
1.80
10:27PM
1.54
Low Tide
/ height (m)
12:59PM
0.18
12:48AM
0.09
1:41PM
0.14
1:29AM
0.07
2:21PM
0.12
2:08AM
0.04
2:58PM
0.11
2:45AM
0.03
3:34PM
0.11
3:22AM
0.03
4:09PM
0.11
4:00AM
0.04
4:46PM
0.11
Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Sunrise7:16--7:16--7:16--7:18--7:18--7:18--7:18--
Sunset-5:25--5:27--5:27--5:27--5:28--5:28--5:29-
cloud
part cloud
cloud
cloud
part cloud
rain showers
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
cloud
part cloud
clear
clear
clear
clear
Rain (mm)
-----1---------------
Temp. °C171820232120202012151516181817171718181717
Feels °C (?)15172121201919157131316151514121416161516
  • Map Icons:
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  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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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