Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 1 am 30 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 30 Aug 2026:

  • Most powerful swell: Saturday 5 Sep, 8AM (local time) - 10ft (3.0m), 9s period, ENE swell with 1,556 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 3.0m 9s and forecast to arrive on Saturday (Sep 05) at 8AM. Winds are predicted to be cross-onshore at the time the swell arrives.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 8AM (Sat 5th Sep)10ft (3.0m) 9s

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


The Lowdown

Right. Rusty here. Let’s have a look at what’s cookin’ over the next couple weeks.

Forecast for Ammonias, a reef setup. Early on, we’re stuck in a pretty grim run. From Sunday 30 August right through to Thursday 11 September, the conditions are just not coming together. It’s a long stretch of poor surf quality. You’ve got a moderate breeze blowing cross-shore or cross-onshore, and a cross-chop or lumpy sea state for almost every session. The combined wave energy is moderate for much of that time (for example 729 on the Sunday morning), but the winds ruin it.

A couple of days do show a small window of something better. Wednesday morning 9 September sees the swell pushing up around 8ft from ENE with a period of 10 seconds, and gentle cross-onshore winds keeping it only fairly choppy. The afternoon then improves to 10ft ENE swell, with a gentle cross-shore breeze and only slight cross-chop. Combined energy jumps to 1962, which is strong. This is the best looking stretch of the whole forecast. It’s big – over 8ft – so this is expert territory only. Not for beginners. The swell direction of ENE doesn’t match the optimum SSE direction for this break, so the waves won’t be perfectly groomed, but the size and lack of strong wind make it the standout.

Then Thursday 10 September morning offers a brief moment of interest: the wind goes light and offshore from the SSE at 10 km/h (6 mph) on an 8ft ENE swell. That’s clean face potential, but the period is only 9 seconds so it’s a bit short and fat. Still, a morning of clean 8ft is worth a look for the experienced crew. Crowds are possible here, so go early.

After that, it drops right off again. Saturday 12 September sees tiny 2ft–2ft SSW swells and moderate cross-onshore chop. The final days are weak or messy. Monday 14 September has a super long period SSW groundswell at 21 seconds but only 1ft – barely a ripple. Not worth paddling out for.

Overall, the first week and a half is a write-off. The real play is Wednesday afternoon 9 September and the Thursday morning 10 September. The rest is a bust.

- Rusty

Short Range Forecast

Moderate rain (total 11mm), heaviest on Sun morning. Warm (max 26°C on Sun morning, min 24°C on Tue night). Wind will be generally light.

Days 4-6 Weather Summary

Heavy rain (total 23mm), heaviest during Thu afternoon. Warm (max 26°C on Wed morning, min 25°C on Wed morning). Mainly fresh winds.

Sunday
30
Monday
31
Tuesday
1
Wednesday
2
Thursday
3
Friday
4
Saturday
5
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
1
0
1
0
0
1
0
0
0
0
1
1
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)
1.9
ENE
7
1.7
ENE
7
1.7
ENE
7
2
ENE
7
1.9
ENE
8
1.9
ENE
8
1.9
ENE
8
1.7
ENE
8
2
ENE
8
0.9
S
16
0.9
S
16
0.9
S
15
1.5
ENE
8
0.8
S
14
2
ENE
8
2.1
ENE
7
2.5
ENE
8
3
ENE
9
3
ENE
9
2.5
ENE
9
2.2
ENE
8
Wave Graph
Metric surfscale
Energy kJ
387
319
301
405
400
410
410
383
475
427
406
352
268
280
452
482
744
1343
1294
1046
642
Wind (km/h)
25
ENE
25
ENE
25
ENE
25
ENE
25
NE
20
ENE
25
ENE
25
NE
20
NE
20
ENE
25
ENE
20
NE
25
ENE
30
NE
30
NE
35
ENE
35
NE
35
ENE
35
E
30
E
25
E
Wind State
cross-on
cross
cross
cross
cross
cross
cross
cross
cross
cross-on
cross
cross
cross-on
cross
cross
cross
cross
cross
cross-on
cross-on
cross-on
High Tide
4:47PM0.49m
5:58AM0.49m
5:08PM0.42m
6:57AM0.52m
5:24PM0.35m
8:09AM0.55m
5:17PM0.30m
9:35AM0.57m
10:57AM0.61m
12:04PM0.65m
11:37PM0.20m
Low Tide
10:51AM0.15m
11:17PM0.04m
11:48AM0.20m
11:45PM0.03m
1:02PM0.26m
00:18AM0.03m
3:05PM0.29m
1:01AM0.04m
2:01AM0.05m
3:24AM0.06m
8:23PM0.17m
rain showers
rain showers
rain showers
rain showers
rain showers
rain showers
rain showers
clear
rain showers
rain showers
rain showers
rain showers
rain showers
rain showers
rain showers
rain showers
part cloud
light rain
mod rain
heavy rain
thunderstorm
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:18
6:20
6:20
6:20
6:20
6:20
6:20
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:54
6:54
6:53
6:52
6:52
6:51
6:50
 mm
1
1
2
1
1
1
1
3
4
2
5
3
4
1
1
3
9
11
6
Temp °C
26
26
26
26
26
25
26
26
25
26
26
26
26
26
25
25
26
25
25
26
26
Feels °C
25
25
25
25
24
24
25
25
24
26
25
26
26
25
23
23
23
23
23
26
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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