Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 7 am 27 Aug 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
27.3°C
0.4° 

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


Ammonias surf forecast from 28 Aug 2026:

  • Most powerful swell: Friday 28 Aug, 2AM (local time) - 3.5ft (1.1m), 15s period, S swell with 567 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 1.1m 15s and forecast to arrive on Friday (Aug 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 0.2m 10s period and expected on Friday (Aug 28) at 2AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 2AM (Fri 28th Aug)3.5ft (1.1m) 15s

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


The Lowdown

Alright, folks, Rusty here. Let’s get straight into it. We’ve got a sixteen-day window for Ammonias, and I gotta be honest with you—it’s looking like a bit of a tough stretch. There’s no surf worth paddling out for right from the get-go, and we’re staring down a long, dry gap.

The overall pattern is dominated by messy, short-period windswell and cross-shore breezes that are just killing any chance of a clean wave. The water temp is sitting at 81°F, which is bang on average for this time of year, so at least you won’t be cold while you’re sitting there watching the chop.

Ammonias is a reef break that’s fairly consistent, but don't let that fool you. The first real sniff of anything comes right at the end, on the 8th and 9th of September. But even then, we’re looking at lumpy, crossed-up conditions with moderate to fresh breezes. The swell around the 6th and 7th of September has some decent energy—combined energy values reaching 1160 and 1376—but it’s all short-period stuff from the ENE, cross-on at times, and the reports are pretty clear: it’s marginal at best. You’d be scratching for a half-decent one.

The real standout, and I mean the only one worth circling on your calendar, is the 5th of September. The Saturday morning session shows a 6ft swell from the ENE with an 11-second period. That’s a proper groundswell, and the combined energy is a solid 1160. It’s still cross-shore, but it’s the best-looking window for any sort of shape and push. It’s not perfect, but it’s the pick of a pretty unattractive bunch.

The rest of the run is a write-off. Persistent moderate cross-shore winds and short-period junk. Plan your days around something else, because this forecast is lean. The long-range stuff on the 11th shows a strong offshore wind, and while that cleans things up, the swell's gone soft and the period is only 8 seconds—not worth the fight.

So, for now, keep your expectations below sea level. If you’re desperate, Saturday the 5th of September might just give you a couple of corners to work with.

Rusty.

Short Range Forecast

Light rain (total 4mm), mostly falling on Fri night. Warm (max 27°C on Fri afternoon, min 25°C on Thu morning). Wind will be generally light.

Days 4-6 Weather Summary

Light rain (total 6mm), mostly falling on Sun morning. Warm (max 27°C on Mon afternoon, min 24°C on Mon night). Wind will be generally light.

Thursday
27
Friday
28
Saturday
29
Sunday
30
Monday
31
Tuesday
1
Wednesday
2
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
1
1
0
1
0
0
0
0
0
1
0
0
1
1
1
0
0
1
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.1
S
17
1
S
17
1.1
S
15
0.9
S
14
0.9
S
14
0.9
S
14
0.8
S
13
1.7
ENE
7
1.8
E
7
1.8
ENE
7
1.7
ENE
7
1.7
ENE
7
2
ENE
7
1.8
ENE
8
2
ENE
8
2
ENE
8
1.9
ENE
8
2
ENE
8
0.9
S
16
0.9
S
16
1.9
ENE
8
Wave Graph
Metric surfscale
Energy kJ
699
553
567
334
320
294
226
247
311
340
310
273
384
372
496
534
512
512
427
412
480
Wind (km/h)
25
NE
25
ENE
20
ENE
20
ENE
25
ENE
20
ENE
25
ENE
25
ENE
25
ENE
25
ENE
25
ENE
20
ENE
25
ENE
25
ENE
20
ENE
20
NE
20
NE
20
ENE
20
E
15
ENE
15
ENE
Wind State
cross
cross
cross
cross
cross
cross
cross
cross
cross-on
cross-on
cross
cross
cross-on
cross
cross
cross
cross
cross-on
cross-on
cross
cross-on
High Tide
3:38PM0.62m
3:40AM0.38m
4:02PM0.59m
4:22AM0.42m
4:25PM0.55m
5:07AM0.46m
4:47PM0.49m
5:58AM0.49m
5:08PM0.42m
6:57AM0.52m
5:24PM0.35m
8:09AM0.55m
5:17PM0.30m
Low Tide
8:40AM0.04m
10:08PM0.11m
9:19AM0.06m
10:29PM0.08m
10:02AM0.10m
10:52PM0.06m
10:51AM0.15m
11:17PM0.04m
11:48AM0.20m
11:45PM0.03m
1:02PM0.26m
00:18AM0.03m
3:05PM0.29m
1:01AM0.04m
clear
clear
part cloud
clear
clear
rain showers
part cloud
clear
rain showers
rain showers
part cloud
part cloud
rain showers
part cloud
clear
clear
clear
rain showers
rain showers
clear
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:18
6:18
6:18
6:18
6:20
6:20
6:20
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:58
6:57
6:55
6:54
6:54
6:53
6:52
 mm
1
3
2
2
2
1
1
Temp °C
26
26
25
26
27
25
26
27
25
26
26
25
26
27
25
26
27
26
27
27
26
Feels °C
24
25
24
25
26
23
25
25
25
25
24
24
25
26
24
26
27
27
28
28
27
  • 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