Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 1 am 21 Jul 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.6° C
0.2° 

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


Ammonias surf forecast from 21 Jul 2026:

  • Most powerful swell: Monday 27 Jul, 8AM (local time) - 4.5ft (1.4m), 16s period, E swell with 923 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 1.4m 16s and forecast to arrive on Monday (Jul 27) at 8AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.0m 8s period and expected on Sunday (Jul 26) at 2AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 8AM (Mon 27th Jul)4.5ft (1.4m) 16s

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


The Lowdown

Alright, listen up. This is the 16-day outlook for Ammonias, and I’m not gonna sugarcoat it. It’s a rough start.

The first couple of days, Tuesday the 21st and Wednesday the 22nd of July, are a total bust. The swell is tiny, the wind is all over the place, and the wave energy is just moderate (568 to 1057). You’re better off waxing your board for the next week. There’s a big gap of nothing worthwhile until we get into the second week.

The one and only real standout in this whole forecast is further out. Mark your calendar for Thursday the 30th of July. The morning session is looking like the pick of the entire run. You’ve got a 2.0m swell from the ENE, with a period of 11 seconds – that’s proper groundswell that will line up on this reef. The wind is a gentle cross-shore from the NE at 15 km/h, so it’s going to be clean and glassy. The wave energy is strong (1224), and with the water temp at 27°, it’s average for this time of year. That’s the one to chase.

Before that, from Thursday the 24th to Wednesday the 29th, it’s all marginal. The swell is there, even getting up to 2.2m, but the wind is always a moderate cross-shore, so there’s always a bit of chop. The period is long (13-16 seconds), so there’s energy, but it’s never clean enough to get really excited.

After that Thursday the 30th, it drops off a cliff. Friday the 31st of July into the first weekend of August, the swell plummets to 0.6m, and the wind turns cross-on. The energy is weak (103 to 278). That’s a total write-off for a paddle. For the kite surfers, the 1.4m to 1.6m cross-shore wind on the 2nd and 3rd of August might look fun, but it’s not a surf day.

For beginners, the 2.0m swell on the 30th is a bit of a step up, but it’s not too big. The 2.2m on the 29th is still manageable.

So, here’s the bottom line: the first week is a don’t-bother. The second week, especially Thursday the 30th of July, is your best shot. It’s a long way off, but it’s the only one that looks worth the wait. Keep your fingers crossed.

Rusty.

Short Range Forecast

Moderate rain (total 14mm), heaviest on Wed morning. Warm (max 26°C on Tue morning, min 23°C on Wed night). Wind will be generally light.

Days 4-6 Weather Summary

Light rain (total 6mm), mostly falling on Fri morning. Warm (max 26°C on Fri afternoon, min 23°C on Sun night). Wind will be generally light.

Tuesday
21
Wednesday
22
Thursday
23
Friday
24
Saturday
25
Sunday
26
Monday
27
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
1
0
0
2
1
0
1
1
0
1
2
1
1
1
2
1
1
2
2
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.8
S
15
0.9
S
14
1
S
13
0.6
SSW
24
0.7
SSW
23
0.7
SSW
22
0.8
SSW
20
0.7
SSW
20
0.9
SSW
18
0.8
SSW
18
0.8
SSW
17
2
ENE
7
2.1
ENE
8
1
SSW
18
1.1
SSW
18
2.1
ENE
8
1.1
E
16
1.3
E
16
1.4
E
15
1.3
E
14
1.3
E
14
Wave Graph
Metric surfscale
Energy kJ
275
320
352
437
564
480
528
399
469
392
379
440
541
731
790
568
585
817
888
687
663
Wind (km/h)
20
ENE
20
ENE
15
ENE
25
E
25
ENE
20
NE
25
ENE
25
ENE
20
ENE
25
ENE
25
NE
25
ENE
25
ENE
25
ENE
20
ENE
25
ENE
25
NE
15
ENE
20
ENE
20
ENE
15
NE
Wind State
cross
cross
cross-on
cross-on
cross
cross
cross-on
cross
cross
cross-on
cross
cross
cross
cross
cross
cross
cross
cross-on
cross
cross
cross
High Tide
11:06AM0.46m
12:06PM0.52m
12:55PM0.57m
1:36PM0.61m
00:21AM0.18m
2:14PM0.63m
1:16AM0.20m
2:48PM0.65m
1:57AM0.21m
3:20PM0.66m
2:33AM0.23m
Low Tide
3:30AM0.04m
4:16AM0.04m
5:07AM0.04m
10:06PM0.17m
6:00AM0.03m
10:10PM0.16m
6:48AM0.01m
10:20PM0.16m
7:31AM-0.01m
10:33PM0.16m
part cloud
rain showers
rain showers
rain showers
rain showers
part cloud
rain showers
rain showers
rain showers
rain showers
clear
rain showers
rain showers
rain showers
rain showers
part cloud
clear
part cloud
rain showers
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:05
6:05
6:05
6:05
6:05
6:07
6:07
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:22
7:21
7:21
7:21
7:20
7:20
7:19
 mm
2
2
5
2
1
1
1
1
1
2
1
1
1
Temp °C
26
26
25
25
25
24
25
25
24
25
26
24
24
25
24
25
25
24
25
26
24
Feels °C
26
26
26
25
25
23
24
24
23
24
25
23
24
24
23
24
23
23
25
26
23
  • 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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