Surf Forecasts:
Bang Niang Rivermouth surf forecast from 18 Sep 2026:
- Best quality surf: Sunday 20 Sep, 10PM (local time) - 4.5ft (1.4m), 8s period, WSW swell with glassy winds.
- Most powerful swell: Saturday 19 Sep, 1AM (local time) - 10ft (3.0m), 9s period, WSW swell with 1,181 kJ wave energy.
- Next surfable swell (1★+): Sunday 20 Sep, 10PM (local time) - 4.5ft (1.4m), 8s period with WSW swell.
Best Forecast Surf Conditions for Bang Niang Rivermouth this week:
The surf forecast for Bang Niang Rivermouth over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Sep 20) at 10PM. The primary swell is predicted to be 1.4m and 8s period with a secondary swell of 0.5m and 16s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Bang Niang Rivermouth in the next 16 days are 3.0m 9s and forecast to arrive on Saturday (Sep 19) at 1AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Thursday (Sep 24) at 4AM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Sun 20th Sep) | 4.5ft (1.4m) 8s |
| Best Surf | 10PM (Sun 20th Sep) | 4.5ft (1.4m) 8s |
| Most Powerful | 1AM (Sat 19th Sep) | 10ft (3.0m) 9s |
Table - best surf conditions forecast for Bang Niang Rivermouth over the next 16 days.
Short Range ForecastHeavy rain (total 105mm), heaviest during Fri afternoon. Warm (max 28°C on Sat morning, min 26°C on Fri morning). Winds decreasing (fresh winds from the WSW on Fri morning, calm by Sun night). | Days 4-6 Weather SummaryHeavy rain (total 49mm), heaviest during Tue afternoon. Warm (max 29°C on Mon morning, min 24°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | Tuesday 22 | Wednesday 23 | Thursday 24 | |||||||||||||||
AM | 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) | WSW 8 | WSW 8 | WSW 9 | WSW 8 | W 8 | WSW 8 | W 8 | W 8 | WSW 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 9 | W 9 | W 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 933 | 1121 | 1181 | 812 | 603 | 427 | 403 | 358 | 264 | 217 | 177 | 153 | 163 | 163 | 185 | 190 | 163 | 195 | 188 | 155 | 148 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | on | cross-on | on | on | glassy | on | cross-on | glassy | on | cross-on | cross-on | on | cross-on | cross-off | cross-on | cross-on | cross |
High Tide | 1:37PM1.62m | 2:08AM1.77m | 2:22PM1.41m | 3:35AM1.59m | 5:23PM1.29m | 6:14AM1.60m | 7:29PM1.46m | 7:32AM1.79m | 8:13PM1.70m | 8:15AM2.01m | 8:45PM1.95m | 8:49AM2.21m | 9:14PM2.19m | ||||||||
Low Tide | 7:33PM0.78m | 8:32AM0.96m | 8:11PM0.97m | 10:46AM1.11m | 10:20PM1.14m | 1:45PM0.95m | 1:29AM1.01m | 2:20PM0.74m | 2:15AM0.79m | 2:47PM0.53m | 2:49AM0.58m | 3:12PM0.33m | 3:20AM0.38m | ||||||||
 | |  |  | | | | | |  | |  | | | |  | | | | | | |
 | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — |
 | — | 6:24 | — | — | 6:24 | — | — | 6:23 | — | — | 6:23 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — |
mm | 14 | 22 | 27 | 9 | 8 | 13 | 6 | 4 | 2 | — | 3 | 6 | 5 | 10 | 9 | 2 | 7 | 7 | 4 | 2 | 6 |
Temp °C | 26 | 26 | 27 | 28 | 27 | 27 | 28 | 28 | 27 | 29 | 28 | 26 | 26 | 25 | 26 | 27 | 26 | 25 | 26 | 26 | 26 |
Feels °C | 25 | 26 | 27 | 30 | 29 | 28 | 31 | 32 | 31 | 32 | 30 | 30 | 30 | 29 | 29 | 30 | 29 | 29 | 28 | 28 | 27 |
Swell 1 Height (m) Direction Period (s) | SW 17 | SW 16 | SW 16 | SW 15 | SW 15 | WSW 8 | W 8 | W 8 | WSW 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 9 | W 9 | W 9 |
| kJ | 46 | 65 | 90 | 34 | 54 | 427 | 403 | 358 | 264 | 217 | 177 | 153 | 163 | 163 | 185 | 190 | 163 | 195 | 188 | 155 | 148 |
Swell 2 Height (m) Direction Period (s) | — | — | — | SW 20 | SW 19 | SW 14 | SW 17 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 14 | SW 13 | SW 13 | WSW 16 | SW 16 | SW 16 | SW 15 |
| kJ | — | — | — | 15 | 14 | 54 | 148 | 140 | 125 | 157 | 119 | 75 | 73 | 73 | 29 | 27 | 27 | 26 | 40 | 40 | 35 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | SW 18 | — | — | S 4 | S 5 | — | — | — | SW 20 | SW 18 | SW 18 | WSW 18 | WSW 13 | SW 12 | SW 12 | — |
| kJ | — | — | — | — | — | 50 | — | — | 3 | 2 | — | — | — | 15 | 13 | 12 | 30 | 17 | 6 | 6 | — |
Wind waves Height (m) Direction Period (s) | WSW 8 | WSW 8 | WSW 9 | WSW 8 | W 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 933 | 1121 | 1181 | 812 | 603 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 729 | 686 | 683 | 686 | 79 | 79 | 67 | 79 | 0 | 67 | 98 | 0 | 79 | 735 | 729 | 735 | 98 | 0 | 729 | 735 | 729 |
Best forecast wave conditions in Andaman Sea | |||||||||||||||||||||
Best forecast wave conditions in Thailand | |||||||||||||||||||||
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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Bang Niang 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.
Information about the Bang Niang Rivermouth Surf forecast
The above surf forecast table for Bang Niang Rivermouth provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Bang Niang Rivermouth can be found by selecting the local surf guide option on the grey menu. Our Bang Niang 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 (Bang Niang 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 Bang Niang 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.
Bang Niang Rivermouth is 87 km (54 miles) from Kathu. If you plan a holiday in Andaman Sea, look for hotels and other accommodation in Kathu. Kathu has rooms for a wide range of budgets as well as car hire and transport links.
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