
Surf Forecasts:
Barron Rivermouth surf forecast from 13 Sep 2026:
- Best quality surf: Wednesday 16 Sep, 8AM (local time) - 3.5ft (1.0m), 16s period, SW swell with glassy winds.
- Most powerful swell: Wednesday 16 Sep, 8AM (local time) - 3.5ft (1.0m), 16s period, SW swell with 492 kJ wave energy.
- Next surfable swell (1★+): Sunday 13 Sep, 2AM (local time) - 2ft (0.6m), 13s period with SW swell.
Best Forecast Surf Conditions for Barron Rivermouth this week:
The surf forecast for Barron Rivermouth over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Sep 13) at 2AM. The primary swell is predicted to be 0.6m and 13s period with a secondary swell of 0.3m and 3s. Another secondary swell of 0.4m and 4s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Barron Rivermouth in the next 16 days are 1.0m 16s and forecast to arrive on Wednesday (Sep 16) at 8AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.2m 2s period and expected on Monday (Sep 14) at 5AM.
| Wave Type | Time (MST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Sun 13th Sep) | 2ft (0.6m) 13s |
| Best Surf | 8AM (Wed 16th Sep) | 3.5ft (1.0m) 16s |
| Most Powerful | 8AM (Wed 16th Sep) | 3.5ft (1.0m) 16s |
Table - best surf conditions forecast for Barron Rivermouth over the next 16 days.
The Lowdown
Alright, let’s get into it. Barron Rivermouth (Guam) – a point/river setup that’s fairly consistent, but the next couple of weeks are going to be a struggle. The water’s warm at 32.1°, which is much warmer than usual for this time of year, so forget the rubber.
The overall picture is small and messy. Swell energy is mostly moderate, with readings in the 200s and 300s, some pulses in the 400s and 500s, and one real spike up to 829. But the wave heights are tiny – 1 to 3 feet at best. The swell direction is consistently southwest, which is right for this spot, but the winds are the problem. Most afternoons are blown out with cross-onshore breezes, and the mornings are often just marginal.
Here’s how it all shakes out.
Saturday, September 12 – Afternoon is a dud. 2-foot southwest swell, 14-second period, but a 20 km/h WNW cross-on wind has it chopped. Poor.
Sunday, September 13 – Morning has 2 feet of southwest, 13-second period, with a light WSW onshore. Marginal. Afternoon, 15 km/h WNW cross-on, poor.
Monday, September 14 – This is your first clean window. Morning has 1.5 to 2 feet of southwest swell, but the period jumps to 18 seconds – real groundswell. And the wind is glassy with a light SSE. It’s small, but it’s clean. At a river mouth, that long period might make it a bit walled, but it’s the best we get early. Afternoon goes back to the cross-on WNW and it’s poor.
Tuesday, September 15 – Morning, 2.5 feet, 16 seconds, light SSW cross-on. Marginal. Afternoon, west onshore at 15 km/h, poor.
Wednesday, September 16 – Morning has the swell pushing to 3 feet, southwest, 16 seconds, with a light WNW cross-on. Energy is building into the 569 range. Still marginal, but there’s some size. Afternoon, 20 km/h WNW cross-on, chopped.
Thursday, September 17 – Morning, 2.5 feet, 14 seconds, WSW onshore. Marginal. Afternoon, 20 km/h WNW cross-on, poor.
Friday, September 18 – Morning, 2 feet, 19-second period – long period but tiny. Light SW cross-on. Marginal. Afternoon, 20 km/h NW cross-on, poor.
Saturday, September 19 – Morning, 2.5 feet, 18 seconds, light SSW cross-on. Marginal. Afternoon, the wind swings south at 5 km/h, light cross-shore. Still only 2.5 feet, but cleaner. Marginal, but a chance.
Sunday, September 20 – This is the pick of the entire run. Morning has 3 feet of southwest swell with a 19-second period, and the energy jumps to 829 – the strongest we see. The wind is a light southerly at 10 km/h, cross-onshore but manageable. It’s still only 3 feet, but with that long period and the river mouth setup, it could have some push if the tide behaves. This is your best bet. Afternoon drops off with a west onshore.
Monday, September 21 – Morning, 3 feet, 17 seconds, WSW onshore. Marginal. Afternoon, west cross-on, marginal.
Tuesday, September 22 – Morning, risk of thunderstorms, 3 feet, 16 seconds, light south cross-shore. Marginal. Afternoon, WSW onshore, marginal.
Wednesday, September 23 – Morning, 2.5 feet, 15 seconds, SSE cross-shore at 15 km/h. Marginal. Afternoon, risk tstorms, SW onshore, marginal.
Thursday, September 24 – Morning, 2.5 feet, 14 seconds, light south cross-on. Marginal. Afternoon, west cross-on, poor.
Friday, September 25 – Morning, 2.5 feet, 13 seconds, west onshore. Marginal. Afternoon, 2 feet, WNW cross-on at 15 km/h, poor.
Saturday, September 26 – Morning, 2 feet, 12 seconds, SW onshore. Marginal. Afternoon, 1 to 1.5 feet, but the period jumps to 19 seconds. Still, with the WNW cross-on, poor.
Sunday, September 27 – Morning, 2 feet, 17 seconds, west onshore. Marginal. Afternoon
Short Range ForecastModerate rain (total 10mm), heaviest on Sun night. Warm (max 31°C on Sun afternoon, min 26°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummarySome drizzle, heaviest during Tue night. Warm (max 31°C on Thu afternoon, min 26°C on Tue night). Wind will be generally light. | |||||||||||||||||||
Sat 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | ||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map | ||||||||||||||||||||
Wave Height (m) Direction Period (s) | SW 14 | SW 13 | SW 13 | SW 13 | SW 13 | SW 18 | SW 18 | SW 18 | SW 16 | SW 16 | SW 16 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 20 | SW 19 | SW 19 | SW 19 |
Wave Graph | ||||||||||||||||||||
160 | 144 | 140 | 108 | 127 | 152 | 246 | 304 | 302 | 384 | 366 | 486 | 352 | 301 | 297 | 248 | 312 | 303 | 303 | 278 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-off | on | cross-on | cross-off | glassy | cross-on | off | cross-on | on | cross-off | cross-on | cross-on | cross-off | on | cross-on | cross-off | cross-on | cross-on | cross-off |
High Tide | 9:23PM1.57m | 9:24AM1.68m | 9:54PM1.43m | 9:40AM1.65m | 10:23PM1.28m | 9:55AM1.61m | 10:51PM1.12m | 10:06AM1.54m | 11:20PM0.97m | 10:12AM1.47m | 10:07AM1.38m | |||||||||
Low Tide | 3:17PM0.35m | 3:16AM0.47m | 3:46PM0.35m | 3:29AM0.60m | 4:15PM0.39m | 3:37AM0.71m | 4:45PM0.47m | 3:37AM0.79m | 5:18PM0.57m | 3:18AM0.85m | 6:09PM0.69m | 11:36PM0.68m | ||||||||
— | — | 5:50 | — | — | 5:50 | — | — | 5:50 | — | — | 5:50 | — | — | 5:52 | — | — | 5:52 | — | — | |
6:10 | — | — | 6:09 | — | — | 6:08 | — | — | 6:07 | — | — | 6:07 | — | — | 6:06 | — | — | 6:05 | — | |
mm | — | — | — | — | 9 | — | — | 1 | — | — | 1 | — | — | — | — | — | — | — | — | 3 |
Temp °C | 30 | 29 | 30 | 31 | 29 | 28 | 29 | 28 | 29 | 30 | 29 | 29 | 30 | 29 | 30 | 31 | 29 | 30 | 31 | 28 |
Feels °C | 31 | 33 | 34 | 34 | 33 | 32 | 31 | 32 | 32 | 33 | 34 | 33 | 32 | 32 | 35 | 34 | 32 | 35 | 34 | 30 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 13 | SW 13 | SW 13 | SW 13 | SW 18 | SW 18 | SW 18 | SW 16 | SW 16 | SW 16 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 | SW 19 |
160 | 144 | 140 | 108 | 104 | 152 | 246 | 304 | 302 | 384 | 366 | 486 | 352 | 301 | 297 | 248 | 176 | 171 | 168 | 278 | |
Swell 2 Height (m) Direction Period (s) | SSW 8 | W 3 | SW 19 | SW 19 | SW 19 | S 4 | SW 12 | SW 12 | S 9 | SW 11 | WSW 6 | SW 11 | SW 11 | SW 22 | SW 21 | SW 21 | SW 20 | SW 19 | SW 19 | SW 13 |
14 | 2 | 59 | 96 | 127 | 9 | 71 | 69 | 6 | 19 | 4 | 29 | 31 | 119 | 162 | 224 | 312 | 303 | 303 | 134 | |
Swell 3 Height (m) Direction Period (s) | SW 18 | SSW 8 | W 4 | SW 16 | W 4 | SW 12 | SSW 4 | W 4 | SW 6 | S 8 | S 8 | WSW 24 | SW 24 | WNW 3 | WSW 6 | SW 6 | WNW 4 | WNW 4 | S 8 | W 4 |
49 | 7 | 1 | 66 | 2 | 73 | 7 | 2 | 2 | 5 | 5 | 54 | 87 | 2 | 3 | 1 | 2 | 3 | 6 | 2 | |
Wind waves Height (m) Direction Period (s) | WNW 3 | WNW 4 | — | W 4 | — | — | W 4 | — | — | WSW 6 | — | — | WNW 3 | NW 3 | — | WNW 3 | NW 4 | — | WNW 3 | — |
2 | 4 | — | 3 | — | — | 1 | — | — | 7 | — | — | 1 | 4 | — | 1 | 6 | — | 4 | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 271 | 0 | 99 | 271 | 0 | 0 | 203 | 0 | 99 | 271 | 0 | 99 | 271 | 0 | 99 | 322 | 0 | 99 | 271 | 0 |
Best forecast wave conditions in Sinaloa | ||||||||||||||||||||
Best forecast wave conditions in Mexico | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
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Information about the Barron Rivermouth Surf forecast
The above surf forecast table for Barron Rivermouth provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Barron Rivermouth can be found by selecting the local surf guide option on the grey menu. Our Barron 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 (Barron 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 Barron 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.
Are you planning a holiday in Sinaloa? If you are looking for accommodation near Barron Rivermouth, camping, hotels and holiday cottages in Sinaloa, consider staying in Mazatlan which is 16 km (10 miles) away. Other places in and around Sinaloa where you can find information about places to rent, and car hire include Escuinapa de Hidalgo which is 58 km (36 miles) away and El Salto, 99 km (61 miles) away.










