Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 7 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 22 Jul 2026:

  • Most powerful swell: Tuesday 28 Jul, 2AM (local time) - 5ft (1.6m), 14s period, E swell with 1,030 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-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 8s period and expected on Monday (Jul 27) 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. Let's have a look at what we've got on the cards for Ammonias.

Right off the bat, I gotta be straight with you – this 16-day window is a bit of a grind. The overall picture is dominated by a lot of cross-shore and cross-onshore winds, with the swell energy mostly coming from directions that don't quite hit the reef right. The water temperature is sitting at 80°, which is pretty much normal for this time of year, so at least you won't be freezing your bits off.

The first couple of days, Tuesday the 21st and Wednesday the 22nd of July, are pretty weak. We're looking at small, short-period swell – around 3ft to 3ft from the S and SSW – but it's all crossed up with a moderate breeze from the ENE. The wave energy is moderate (601 to 1091), but the wind is just making things messy. It's not worth paddling out for.

The real action, if you can call it that, starts to build from Thursday the 24th of July. The swell size jumps up, but it's a messy, short-period windswell from the ENE. By Friday the 24th, we're seeing 7ft, and into Saturday the 25th, 7ft again. The period is short, around 7 to 8 seconds, so it's all chop and no shape. The combined energy is strong (1063 to 1336), but the wind is still cross or cross-on, making it a choppy, blown-out mess. Honestly, for a paddle surfer, it's a write-off. If you've got a kite, this is where it gets interesting – that wind and lumpy water is your playground.

The best stretch, and I'm using the term loosely, looks to be from Sunday the 27th of July through to Wednesday the 30th of July. The swell drops back to a more manageable 5ft to 6ft, and the period stretches out to 13 to 15 seconds. That's a proper groundswell! The wind eases up a bit, going from a gentle to moderate breeze out of the NE and ENE. It's still cross-shore, so there will be a bit of a cross-chop, but it's the cleanest the water is going to be. The combined energy is strong (1067 to 1450), so there's some push. The swell direction is from the E and ENE, which isn't the optimum SSE for the reef, but it's the best we've got. This is the only window where you might find a few workable, if not perfect, waves.

After that, we roll into the first week of August. The 1st of August brings a jump back up to 8ft, but it's all short-period windswell again, and the wind is back to being cross-onshore. It's a step back into the messy zone. The 4th of August looks like a brief respite, with the swell dropping to 5ft and the wind easing to a light breeze, but the period is still short at 8 seconds. The 5th of August then fades out completely with tiny 2ft SSW groundswell and poor onshore wind.

So, the standout window is the end of July, from the 27th through the 30th. It's not going to be a world-class session, but it's the only chance for a half-decent surf. The bigger swell days are all blown out, and the smaller days are too weak. Keep your expectations low, and you might just snag a couple.

- Rusty

Short Range Forecast

Moderate rain (total 15mm), heaviest on Wed morning. Warm (max 25°C on Tue morning, min 23°C on Wed night). Wind will be generally light.

Days 4-6 Weather Summary

Light rain (total 8mm), mostly falling on Fri morning. Warm (max 26°C on Sun afternoon, min 24°C on Fri morning). 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
1
1
0
0
2
0
1
2
1
1
2
2
1
2
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
2.1
ENE
7
0.8
SSW
17
2
ENE
8
2.1
ENE
8
1
SSW
18
1
SSW
18
1
SSW
16
1
E
16
1.3
E
16
1.4
E
15
1.4
E
14
1.6
E
14
Wave Graph
Metric surfscale
Energy kJ
275
320
352
437
564
480
528
399
469
431
390
452
519
731
662
575
489
817
853
808
1030
Wind (km/h)
25
ENE
25
ENE
15
ENE
25
E
25
ENE
20
ENE
25
ENE
25
ENE
25
ENE
25
ENE
30
ENE
25
ENE
25
NE
25
ENE
25
ENE
25
ENE
25
NE
25
ENE
20
ENE
20
NE
20
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
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
rain showers
rain showers
rain showers
rain showers
rain showers
part cloud
rain showers
clear
clear
rain showers
rain showers
rain showers
rain showers
rain showers
part cloud
part cloud
part cloud
rain showers
part cloud
clear
clear
<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
1
2
3
5
3
1
1
1
1
2
2
1
Temp °C
25
25
24
25
25
24
25
25
24
25
25
24
24
25
24
25
26
24
25
25
24
Feels °C
24
24
24
26
24
23
24
23
23
24
24
23
24
25
23
24
25
23
24
25
23
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder
How to use the Wavefinder 
submit an eyeball surf report

Quick surf report for Ammonias:

join our community of surf reporters

FREE! Surf-Forecast.com widget for your website

The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Ammonias surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.


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

Nearest locationNearest