Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 7 am 12 Jul 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.3° C
0.1° 

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


Ammonias surf forecast from 12 Jul 2026:

  • Most powerful swell: Sunday 12 Jul, 2PM (local time) - 7ft (2.1m), 8s period, ENE swell with 487 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 2.1m 8s and forecast to arrive on Sunday (Jul 12) at 2PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 8s period and expected on Tuesday (Jul 14) at 8PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 2PM (Sun 12th Jul)7ft (2.1m) 8s

Table - best surf conditions forecast for Ammonias over the next 16 days.


Alright, Rusty here, let’s talk about what’s happening at Ammonias over the next couple of weeks.

Honestly, mate, the outlook is a bit of a bummer. We’ve got a long stretch of mediocrity and poor conditions ahead. The first surfable window doesn't really show up until Sunday the 26th of July, and even then it’s only just scraping in. Before that, from the 12th through to the 25th, it’s a big, fat gap of onshore winds, cross-chop, and junk. The wind is almost always cross-on or cross-shore from the ENE or NE, and the swell is small, short-period, and weak. A few days in the middle of the second week see a bit of long-period S or SSW groundswell sneaking in, but the wind never cleans it up, and the energy is still moderate at best. The combined energy values are mostly in the 400-600 range, which is underwhelming.

The water temperature is sitting at 79°, which is bang on average for this time of year, so nothing weird there.

The only real glimmer, and I mean a tiny one, comes on Sunday the 26th of July afternoon. We’ve got a 3ft swell from the East, with a period of 15 seconds. That’s a proper long-period groundswell, which is a positive because it’ll have some push and shape. The combined energy hits 1034, which is the only moderate-to-strong reading in the whole forecast. The wind is cross from the ENE at 16 mph, so it’s not clean, but it’s not direct onshore either. The crowd situation at Ammonias can be “often” busy, so don’t expect to have it to yourself, but for a spot that’s fairly consistent, this is the best on offer.

That’s your standout. It’s not a classic, but it’s the only one in the whole 16 days that’s worth a look. The rest of the time, the wind is a mess and the swell is mushy. For the few days before and after that, the swell drops back to 2ft to 3ft, with periods of 14-21 seconds, but the wind stays cross or cross-on, so it’s going to be choppy and hard to ride.

Rusty.

Short Range Forecast

Moderate rain (total 13mm), heaviest on Tue morning. Warm (max 25°C on Sun morning, min 23°C on Mon night). Wind will be generally light.

Days 4-6 Weather Summary

Moderate rain (total 13mm), heaviest on Wed morning. Warm (max 26°C on Wed afternoon, min 24°C on Wed morning). Wind will be generally light.

Sunday
12
Monday
13
Tuesday
14
Wednesday
15
Thursday
16
Friday
17
Saturday
18
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
1
1
0
1
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)
2.1
ENE
7
2
ENE
8
2.1
ENE
8
1.8
ENE
8
1.6
ENE
8
1.5
ENE
7
1.6
ENE
7
1.5
ENE
8
1.5
ENE
8
1.4
ENE
7
1.1
ENE
7
0.8
SSW
16
0.7
SSE
9
1.4
ENE
7
1
SSW
11
1.5
ENE
7
0.6
SSW
16
1.2
ENE
7
0.7
SSW
14
0.7
SSW
14
1.4
ENE
8
Wave Graph
Metric surfscale
Energy kJ
475
447
480
358
288
229
279
257
240
207
125
314
86
180
247
204
196
130
207
210
257
Wind (km/h)
25
ENE
25
ENE
25
ENE
20
ENE
25
ENE
20
NE
25
NE
20
NE
20
ENE
20
E
15
ENE
20
E
20
E
25
ENE
25
ENE
25
ENE
20
ENE
20
ENE
20
E
20
ENE
20
E
Wind State
cross-on
cross
cross
cross
cross
cross
cross
cross
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross
cross
cross-on
cross-on
cross-on
High Tide
3:04PM0.77m
2:08AM0.19m
3:47PM0.78m
3:04AM0.21m
4:29PM0.77m
3:58AM0.23m
5:08PM0.73m
4:55AM0.26m
5:45PM0.67m
5:57AM0.28m
6:18PM0.59m
7:07AM0.31m
6:48PM0.51m
Low Tide
10:34PM0.12m
7:55AM-0.11m
11:06PM0.11m
8:46AM-0.10m
11:38PM0.10m
9:34AM-0.07m
00:10AM0.09m
10:22AM-0.02m
00:42AM0.08m
11:11AM0.05m
1:14AM0.06m
12:04PM0.14m
1:46AM0.05m
rain showers
rain showers
rain showers
part cloud
part cloud
rain showers
rain showers
clear
rain showers
rain showers
rain showers
rain showers
rain showers
clear
part cloud
part cloud
part cloud
rain showers
thunderstorm
light rain
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:01
6:01
6:01
6:01
6:03
6:03
6:03
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:23
7:23
7:22
7:22
7:22
7:22
7:22
 mm
2
2
3
1
3
2
4
3
4
1
1
2
3
Temp °C
25
25
24
25
25
24
24
25
24
25
26
25
25
26
25
26
26
25
25
26
25
Feels °C
25
24
23
24
24
23
23
24
24
25
27
27
25
26
25
26
26
26
26
27
26
  • Map Icons:
  • Break
  • 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 Ammonias Surf forecast

The above surf forecast table for Ammonias provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Ammonias can be found by selecting the local surf guide option on the grey menu. Our Ammonias 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 (Ammonias) 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 Ammonias 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 vacation in Kaua'i? If you are looking for accommodation near Ammonias, camping, hotels and condos and appartments in Kaua'i, consider staying in Nawiliwili which is 2 km (1 miles) away. Alternatively, find information about places to stay and car hire in Lihue - Kauai which is 3 km (2 miles) away

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