Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 1 am 22 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 22 Jul 2026:

  • Most powerful swell: Tuesday 28 Jul, 2AM (local time) - 5ft (1.6m), 14s period, E swell with 974 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 1.6m 14s and forecast to arrive on Tuesday (Jul 28) at 2AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 8s period and expected on Tuesday (Jul 28) at 2AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 2AM (Tue 28th Jul)5ft (1.6m) 14s

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


The Lowdown

Alright, Rusty here again, this time in feet and miles. Let’s talk Ammonias. It’s a reef setup, so you know it needs the right direction to fire. Right now, the stars just aren’t aligned. The wind is all wrong, and the swell is mostly small and messy. Water temp’s about 80°, which is pretty average for this time of year, nothing wild.

We’re staring down a long dry spell. From Wednesday the 22nd of July all the way through the end of the month, you can leave your board at home. Swell is mostly under 3 feet, wind is cross or cross-on from the east-northeast at 12 to 18 mph. The energy numbers are decent—like 1058 to 1274—but that’s background rumble, not rideable quality. The period is super long, over 20 seconds, which is classic groundswell, but on a reef with that wind, it’s just a crumbly, choppy mess. Conditions are called poor or marginal every time, with cross-chop and lumpy surfaces. Nothing to get excited about.

Thursday the 24th of July, we get a spike to around 6 to 7 feet, but it’s from the east-northeast with a period of just 7 seconds. That’s short-period junk. The energy is high, 1064 and 1173, but it’s sloppy. The wind is still cross. Marginal at best.

Things pick up from Monday the 27th of July into early August. Swell climbs from 4 feet to just over 8 feet by Wednesday the 5th of August. The period improves to 12-13 seconds, and the energy gets huge, like 2258 on the morning of the 5th. That’s serious power. But the wind stays cross or cross-on from the east-northeast, and even when it’s light, it’s onshore or side-shore, keeping the surface choppy. The direction is east or east-northeast, not the south-southeast the reef really wants. So it never properly cleans up.

Thursday the 6th of August sees the wind finally go light and onshore from the southeast, with the swell at a solid 8 feet from the east-northeast at 12 seconds. Energy is 1747 and then 2139. That’s a lot of water moving. But on a reef, with onshore wind, even light, it’s going to be bumpy and tricky. It’s the best of a bad bunch, but it’s a long way off—less certain, but promising in size. Only experts need apply, because 8 feet on a reef is serious.

So the standout, if there is one, is the morning of Wednesday the 5th of August. 8 feet of swell, 13-second period, energy 2258. The wind is light cross-on, so you might get some workable waves if you don’t mind a bit of texture. That afternoon and Thursday the 6th are also in the mix, but it’s still not clean.

First week is a total bust. From the 22nd to the end of July, don’t bother. Early August has the size and power, but the wind just won’t get out of the way. If you’re a local expert who can handle some chop, the 5th and 6th of August are your only real options. For everyone else, wait for the next system.

Rusty.

Short Range Forecast

Moderate rain (total 14mm), heaviest on Wed morning. Warm (max 26°C on Fri afternoon, min 23°C on Wed night). Mainly fresh winds.

Days 4-6 Weather Summary

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

Wednesday
22
Thursday
23
Friday
24
Saturday
25
Sunday
26
Monday
27
Tuesday
28
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
1
1
0
1
1
2
1
2
0
1
2
2
2
2
2
2
1
1
1
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.6
SSW
24
0.7
SSW
23
0.7
SSW
22
0.8
SSW
20
0.7
SSW
20
0.9
SSW
18
2.1
ENE
7
0.8
SSW
17
2.1
ENE
7
2
ENE
8
1
SSW
18
1.1
SSW
18
1
SSW
16
0.9
SSW
16
1.1
E
15
1.2
E
14
1.2
E
14
1.6
E
14
1.5
E
13
1.5
E
13
1.6
E
13
Wave Graph
Metric surfscale
Energy kJ
437
564
480
528
399
469
432
366
468
502
731
790
575
452
513
594
585
974
784
771
848
Wind (km/h)
25
E
25
ENE
20
ENE
30
ENE
25
ENE
25
ENE
25
ENE
25
ENE
20
ENE
25
ENE
25
NE
25
ENE
25
ENE
25
ENE
25
ENE
20
NE
25
ENE
20
ENE
20
ENE
25
NE
15
NE
Wind State
cross-on
cross
cross
cross-on
cross
cross
cross
cross
cross
cross-on
cross
cross
cross
cross
cross
cross
cross
cross-on
cross
cross
cross
High Tide
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
3:50PM0.67m
3:10AM0.25m
Low Tide
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
8:11AM-0.02m
10:50PM0.15m
rain showers
rain showers
part cloud
rain showers
clear
rain showers
rain showers
clear
rain showers
rain showers
clear
rain showers
part cloud
clear
rain showers
part cloud
clear
part cloud
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:05
6:05
6:05
6:05
6:07
6:07
6:07
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:21
7:21
7:21
7:20
7:20
7:19
7:19
 mm
5
3
1
2
1
2
1
3
2
Temp °C
25
25
24
24
25
24
25
26
24
25
26
24
25
26
24
25
26
24
25
26
24
Feels °C
25
24
23
23
23
23
24
25
23
24
25
23
24
25
23
24
25
24
24
26
24
  • 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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