Surf Forecasts:
Nai Harn Beach surf forecast from 16 Jul 2026:
- Most powerful swell: Thursday 16 Jul, 1PM (local time) - 3.5ft (1.0m), 8s period, W swell with 129 kJ wave energy.
Best Forecast Surf Conditions for Nai Harn Beach this week:
The most powerful waves expected at Nai Harn Beach in the next 16 days are 1.0m 8s and forecast to arrive on Thursday (Jul 16) at 1PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 7s period and expected on Tuesday (Jul 21) at 7PM.
| Wave Type | Time (+07) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1PM (Thu 16th Jul) | 3.5ft (1.0m) 8s |
Table - best surf conditions forecast for Nai Harn Beach over the next 16 days.
The Lowdown
Alright, Rusty here. Let's break down the next 16 days at Nai Harn Beach, and I gotta be straight with you – it's a flat, blown-out mess.
We’re looking at a full 16-day window with zero good surf. The swell just isn't showing up with any quality, and the wind is a persistent problem. The water temp is about where it should be for this time of year.
First week kicks off Thursday, July 16th, with a tiny 3ft swell from the west, but it's short-period (8 seconds) and the wind is a light cross-shore, so it's just not clean. It stays like this through the weekend and into the next week. There's a little bump on Tuesday, July 21st, with the swell touching 4ft, and the combined energy is moderate (136), but the wind is still a cross-onshore 16 mph, so it's just a choppy mess. It's poor surf conditions all the way.
The second week falls off a cliff. From Wednesday, July 23rd, the swell drops to a tiny 0.3ft, with some very long-period energy (18 seconds) but zero size. The wind stays fresh and cross-onshore, turning into a proper lumpy, fresh breeze by the end of the month. It's just not happening.
The only thing that stands out is the very end, on Friday, July 31st. The swell is up to 6ft from the west, with a combined energy of 311 (strong) – the biggest pulse of the whole run. But the wind is a fresh 19 mph cross-onshore, so it's going to be a lumpy, blown-out mess. That's for experts only, and even then, it's a battle.
For a beach and reef setup like Nai Harn, with that persistent wind, it's looking more like a day for the kites, not the paddle. We're in a real dry spell, and it's not uncommon for this area to have a blank run like this. Forecasts can change, but right now, I'd be finding something else to do.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Thu afternoon. Warm (max 29°C on Wed night, min 27°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 9mm), mostly falling on Sat night. Warm (max 28°C on Sat night, min 27°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | |||||||||||||||
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) | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | WSW 15 | W 7 | WSW 15 | W 7 | W 6 | W 6 | W 7 | W 6 | W 6 | W 6 | W 7 | W 16 | W 7 | W 7 | W 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 125 | 129 | 102 | 80 | 31 | 48 | 22 | 28 | 21 | 60 | 48 | 55 | 85 | 91 | 67 | 75 | 123 | 5 | 107 | 107 | 36 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 11:47AM2.09m | 00:22AM1.71m | 12:27PM2.03m | 1:02AM1.70m | 1:05PM1.91m | 1:42AM1.66m | 1:42PM1.76m | 2:21AM1.60m | 2:20PM1.59m | 3:02AM1.52m | 2:59PM1.41m | 3:50AM1.45m | 3:48PM1.25m | ||||||||
Low Tide | 5:30AM0.18m | 6:16PM-0.02m | 6:13AM0.21m | 6:54PM0.02m | 6:54AM0.27m | 7:31PM0.10m | 7:35AM0.36m | 8:06PM0.21m | 8:18AM0.48m | 8:40PM0.34m | 9:05AM0.60m | 9:17PM0.48m | 10:03AM0.70m | 10:02PM0.60m | |||||||
 |  |  | | | |  | |  |  | |  | | | | | | | | | | |
 | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — |
 | — | 6:47 | — | — | 6:47 | — | — | 6:47 | — | — | 6:47 | — | — | 6:47 | — | — | 6:47 | — | — | 6:47 | — |
mm | — | 1 | — | — | — | — | 1 | — | 2 | — | 1 | 2 | — | 1 | 1 | 1 | 1 | 2 | 1 | — | 1 |
Temp °C | 28 | 29 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 |
Feels °C | 32 | 32 | 31 | 30 | 30 | 30 | 31 | 30 | 31 | 29 | 29 | 29 | 29 | 28 | 30 | 30 | 29 | 30 | 29 | 29 | 30 |
Swell 1 Height (m) Direction Period (s) | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 8 | W 7 | WSW 15 | WSW 14 | W 7 | W 7 | W 14 | S 4 | W 8 | W 7 | W 13 | W 16 | W 16 | W 16 | W 7 |
| kJ | 125 | 129 | 102 | 80 | 63 | 48 | 57 | 28 | 21 | 21 | 10 | 16 | 4 | 1 | 12 | 4 | 3 | 5 | 5 | 5 | 97 |
Swell 2 Height (m) Direction Period (s) | SSE 5 | SSE 5 | WSW 17 | WSW 16 | WSW 16 | NW 7 | WSW 15 | WSW 15 | — | — | WSW 14 | WSW 14 | SW 14 | W 13 | W 13 | W 13 | W 16 | W 12 | W 12 | W 12 | W 16 |
| kJ | 5 | 3 | 27 | 25 | 25 | 14 | 22 | 21 | — | — | 20 | 19 | 7 | 3 | 3 | 3 | 5 | 3 | 3 | 3 | 5 |
Swell 3 Height (m) Direction Period (s) | W 16 | WSW 16 | SE 5 | — | — | WSW 16 | — | — | — | — | WNW 8 | — | — | — | — | W 17 | W 16 | — | — | — | — |
| kJ | 5 | 26 | 1 | — | — | 24 | — | — | — | — | 7 | — | — | — | — | 6 | 5 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | W 8 | — | WNW 3 | WNW 8 | W 7 | W 7 | W 6 | W 6 | W 7 | W 6 | W 6 | W 6 | W 7 | W 7 | W 7 | W 7 | W 7 |
| kJ | — | — | — | — | 31 | — | 2 | 25 | 54 | 60 | 48 | 55 | 85 | 91 | 67 | 75 | 123 | 111 | 107 | 107 | 36 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 636 | 635 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
Best forecast wave conditions in Phuket | |||||||||||||||||||||
Best forecast wave conditions in Thailand | |||||||||||||||||||||
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Information about the Nai Harn Beach Surf forecast
The above surf forecast table for Nai Harn Beach provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Nai Harn Beach can be found by selecting the local surf guide option on the grey menu. Our Nai Harn Beach 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 (Nai Harn Beach) 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 Nai Harn Beach 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.
Nai Harn Beach is 8 km (5 miles) from the city of Ban Chalong. If you plan a holiday in Phuket, look for hotels and other accommodation in Ban Chalong. Ban Chalong has rooms for a wide range of budgets as well as car hire and transport links.
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