Nai Harn Beach Surf Break

Lat Long: 7.78° N 98.30° E

Nai Harn Beach Surf Forecast and Surf Report

Issued: 12 am 14 Jul 2026 (local time)

Forecast update in  hr  min

Today's Nai Harn Beach sea temperature is
30.0° C
0.6° 

Nai Harn Beach surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Nai Harn Beach surf forecast from 13 Jul 2026:

  • Best quality surf: Thursday 16 Jul, 10PM (local time) - 3ft (0.9m), 8s period, W swell with cross-offshore winds.
  • Most powerful swell: Tuesday 14 Jul, 10AM (local time) - 6ft (1.8m), 8s period, W swell with 367 kJ wave energy.
  • Next surfable swell (1★+): Thursday 16 Jul, 10PM (local time) - 3ft (0.9m), 8s period with W swell.

Best Forecast Surf Conditions for Nai Harn Beach this week:

The surf forecast for Nai Harn Beach over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Jul 16) at 10PM. The primary swell is predicted to be 0.9m and 8s period. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Nai Harn Beach in the next 16 days are 1.8m 8s and forecast to arrive on Tuesday (Jul 14) at 10AM. 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 8s period and expected on Tuesday (Jul 14) at 4PM.

Wave TypeTime (+07) & Date Wave Height & Period
Next good surf (1 star+)10PM (Thu 16th Jul)3ft (0.9m) 8s
Best Surf10PM (Thu 16th Jul)3ft (0.9m) 8s
Most Powerful10AM (Tue 14th Jul)6ft (1.8m) 8s

Table - best surf conditions forecast for Nai Harn Beach over the next 16 days.


The Lowdown

Alright, mates, Rusty here. I've been staring at the charts for Nai Harn Beach, and I've got to level with you – this next 16 days is a tough stretch. We're looking at a flat spell with a few frustrating near-misses, but nothing that's going to get you out of bed.

The main issue is the wind. It's going to be hammering from the west and southwest, onshore and cross-onshore, for almost the entire period. That's just going to chop up whatever little bumps try to form. The water temp is about average for the time of year, but you won't be thinking about that when you're getting blown off your board.

The first real sniff of something rideable comes on Sunday, July 19th. We've got a 4ft west swell, but it's a short 6-second period, so it's a weak, windswell feeling. The wind will be a fresh cross-onshore from the west at 19 mph, making it lumpy. The combined energy is moderate (137), but it's not going to be pretty. By Sunday afternoon, it's a bit bigger at 5ft, but still lumpy and messy with the same wind. For intermediates, this is gonna be a tough, frustrating paddle.

The swell picks up a bit more on Monday, July 20th. The morning sees a 5ft west swell, but it's an onshore wind from the WSW at 19 mph, so it's going to be blown out. This is getting into the territory where it's a bit much for beginners, but the onshore wind will make it a sloppy, closed-out mess for everyone else. Honestly, with the amount of wind and the beach-and-reef setup here, this looks more interesting for a kite surfer than a paddle surfer.

After that, the energy drops off a cliff. From Tuesday, July 22nd, right through to the end of the month, we're looking at tiny waves, mostly under 3ft, with the same relentless cross-onshore wind. There are a few long-period pulses (16-20 seconds), but they're ridiculously small, less than 0.7ft, so they won't even register. The best you can hope for is a knee-high, wind-affected mess on the 29th of July, with a 3ft west swell, a 9-second period, and moderate energy (132), but it's still a fresh cross-onshore wind.

So, the bottom line? There's a slight window of bigger, but very poor quality, surf on the 19th, 20th, and 21st of July. But it's not a "standout" by any stretch – it's just the least bad of a bad bunch. The rest of the run is a total write-off. Keep your expectations on the floor and your wax in the cupboard. This one's a dud.

Rusty.

Short Range Forecast

Moderate rain (total 18mm), heaviest on Tue morning. Warm (max 29°C on Mon night, min 28°C on Mon night). Wind will be generally light.

Days 4-6 Weather Summary

Light rain (total 7mm), mostly falling on Sat morning. Warm (max 29°C on Fri afternoon, min 28°C on Thu night). Winds increasing (light winds from the NW on Thu night, fresh winds from the W by Sun afternoon).

Tuesday
14
Wednesday
15
Thursday
16
Friday
17
Saturday
18
Sunday
19
Monday
20
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.8
W
8
0.1
W
19
0.1
W
18
0.1
W
17
0.1
W
17
0.1
W
16
0.1
SW
16
0.9
W
7
0.8
W
8
0.8
W
8
0.7
W
8
0.8
W
8
0.5
W
8
0.9
W
6
0.2
WSW
15
1.3
W
6
1.5
W
6
0.1
W
14
1.6
W
7
1.5
W
7
1.3
W
7
Wave Graph
Metric surfscale
Energy kJ
367
7
6
6
5
5
10
71
82
72
58
82
28
56
21
116
181
4
254
223
172
Wind (km/h)
25
W
15
SW
5
SSW
5
W
5
SE
5
SSE
5
WSW
10
W
5
NW
10
W
15
W
15
W
20
W
20
W
25
W
30
W
30
W
35
W
30
WSW
30
W
30
WSW
Wind State
cross-on
on
on
cross-on
cross
glassy
on
cross-on
cross
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
on
cross-on
cross-on
High Tide
10:19AM2.03m
10:55PM1.65m
11:05AM2.08m
11:40PM1.70m
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
Low Tide
4:51PM0.05m
4:45AM0.20m
5:35PM-0.01m
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
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thunderstorm
thunderstorm
thunderstorm
thunderstorm
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thunderstorm
thunderstorm
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<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:16
6:16
6:16
6:16
6:16
6:16
6:16
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:47
6:47
6:47
6:47
6:47
6:47
6:47
 mm
3
3
4
4
1
2
1
1
2
1
1
Temp °C
29
29
29
28
29
29
28
29
28
28
29
28
28
28
28
28
28
28
28
29
28
Feels °C
30
32
33
32
33
33
32
32
32
31
31
31
30
29
29
28
27
27
27
29
28
  • 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 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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