Nai Harn Beach Surf Break

Lat Long: 7.78° N 98.30° E

Nai Harn Beach Surf Forecast and Surf Report

Issued: 6 pm 14 Sep 2026 (local time)

Forecast update in  hr  min

Today's Nai Harn Beach sea temperature is
29.8°C
1.0° 

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 14 Sep 2026:

  • Most powerful swell: Friday 18 Sep, 4AM (local time) - 10ft (3.0m), 9s period, WSW swell with 1,297 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 3.0m 9s and forecast to arrive on Friday (Sep 18) 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 2.4m 10s period and expected on Saturday (Sep 19) at 7AM.

Wave TypeTime (+07) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 4AM (Fri 18th Sep)10ft (3.0m) 9s

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


The Lowdown

Rusty here again, looking at the same stretch of coast. I'll keep it in feet and miles per hour for you.

Right off the bat, I gotta be straight with you – it's looking pretty bleak for a long stretch. The first bit of surf worth even talking about doesn't show up until Thursday the 17th, and even then, it's messy. We're looking at a solid run of poor conditions through most of the period, so temper your expectations.

For the morning of Thursday the 17th, we get a small pulse of swell, around 4ft from the West with a moderate 10-second period. The combined energy is moderate (308), but the wind is cross-onshore and choppy, so it's not going to be pretty. It's a beach and reef setup, exposed to the West, which is what we want, but that wind is going to trash it. By the afternoon, it picks up to 6ft, still from the West, with a shorter period of 8 seconds. The energy climbs a bit (378), but it's still cross-onshore and choppy. Honestly, this looks more like a kite session than a paddle session.

Friday the 18th sees the swell jump up significantly. Morning has 8ft from the West, period around 10 seconds, and the combined energy is strong at 1064. The afternoon is similar, 8ft and 1033 energy. This is proper size, but it's blowing a fresh cross-onshore wind at 18-22 mph and it's lumpy. This is expert-only territory if you're brave enough, but the quality is shot.

We get a brief break in the wind on Saturday the 19th morning. Swell drops to 5ft from the West, period still 10 seconds, and the wind switches to onshore but a bit lighter. Energy is moderate (397). Still not clean, but it's the best of a bad bunch for the first week.

After that, it flat-lines. From Sunday the 20th right through to Friday the 25th, we're looking at tiny dribble, less than a foot. The winds are light and variable, mostly cross or cross-onshore, but there's just no energy. This is a real blank run for Nai Harn.

Now, there is a late surge. On Saturday the 26th, the swell comes back up with a vengeance: 8ft to 8ft from the West, but the period is short, only 7 seconds. Combined energy is strong (512-628). The wind is cross-shore and fresh, creating a lumpy mess. This is big, but poor quality.

Sunday the 27th is the biggest day of the outlook, with 8ft from the West and an 8-second period. The energy is very strong at 973. But again, it's cross-shore and lumpy with a fresh breeze. This is big, powerful, and ugly. Only for the experienced and the desperate.

It starts to taper off into the following week, but the wind stays onshore or cross-onshore, so the quality never really comes together.

Water temp at the start of the period is about 86°, which is about average for this time of year.

So, to be honest, there are no true standouts here. The best on offer is probably the Saturday morning of the 19th, when the swell is a manageable 5ft and the wind is just onshore, not cross-onshore. It's not good, it's just less bad. The late spike on the 27th has the size, but the short period and wind kill it. For a wave that's inconsistent at the best of times, this is a tough run.

Rusty, signing off.

Short Range Forecast

Heavy rain (total 46mm), heaviest during Tue night. Warm (max 29°C on Tue morning, min 25°C on Wed night). Winds increasing (light winds from the WSW on Mon night, fresh winds from the WNW by Wed afternoon).

Days 5-7 Weather Summary

Heavy rain (total 101mm), heaviest during Thu afternoon. Warm (max 29°C on Fri night, min 25°C on Thu afternoon). Mainly strong winds.

Mon
14
Tuesday
15
Wednesday
16
Thursday
17
Friday
18
Saturday
19
Sunday
20
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
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.3
WSW
17
0.3
WSW
16
0.3
WSW
16
0.8
WSW
6
0.7
W
6
0.9
W
6
0.2
WSW
15
1.2
W
7
1.2
W
10
1.8
W
8
2.5
W
9
2.4
W
10
2.3
W
10
2.1
W
9
1.4
W
10
0.1
W
19
0.2
WSW
18
0.2
WSW
18
0.2
WSW
17
0.9
W
8
Wave Graph
Metric surfscale
Energy kJ
54
50
50
49
33
55
21
123
296
377
1157
1035
998
732
384
7
31
30
29
108
Wind (km/h)
10
SW
15
WSW
10
WSW
25
WNW
15
NW
15
WNW
30
WNW
25
WNW
20
WNW
20
WNW
35
W
30
WSW
35
WSW
35
WSW
35
WSW
30
WSW
20
SSW
15
SSE
15
SSE
10
SE
Wind State
on
cross-on
on
cross
cross
cross
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
on
on
on
on
cross
cross-on
cross
High Tide
00:22AM1.90m
12:31PM1.70m
00:49AM1.81m
12:58PM1.55m
1:16AM1.69m
1:24PM1.39m
1:47AM1.55m
1:54PM1.23m
2:27AM1.40m
2:37PM1.08m
3:48AM1.26m
5:54PM0.98m
Low Tide
6:09PM0.09m
6:32AM0.20m
6:33PM0.20m
7:01AM0.31m
6:57PM0.34m
7:32AM0.46m
7:21PM0.48m
8:08AM0.61m
7:48PM0.63m
9:04AM0.77m
8:27PM0.78m
11:46AM0.84m
11:07PM0.89m
thunderstorm
thunderstorm
thunderstorm
thunderstorm
rain showers
thunderstorm
thunderstorm
mod rain
light rain
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
part cloud
rain showers
<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
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:27
6:27
6:25
6:25
6:24
6:23
6:23
 mm
5
2
1
1
10
9
7
10
1
26
30
16
15
2
1
4
5
2
1
Temp °C
28
28
29
27
27
27
27
28
26
25
26
26
26
29
29
28
28
28
29
29
Feels °C
31
30
31
28
29
29
27
29
27
27
27
25
25
28
28
27
29
30
32
32
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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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