Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 7 pm 12 Aug 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.6° C
0.1° 

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


Ammonias surf forecast from 13 Aug 2026:

  • Most powerful swell: Sunday 16 Aug, 2AM (local time) - 10ft (3.0m), 9s period, E swell with 1,641 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 Sunday (Aug 16) 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 1.2m 7s period and expected on Wednesday (Aug 19) at 8PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 2AM (Sun 16th Aug)10ft (3.0m) 9s

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


The Lowdown

Alright folks, Rusty here. Let's have a look at what's on the cards for Ammonias.

Honestly, looking at the next 16 days, it's a tough slog. The forecast is a long stretch of poor conditions with only a few moments that are even worth a mention. The general pattern is persistent cross-shore and cross-onshore winds and a lot of lumpy, choppy water. We’re looking at a lot of days where you're just battling the wind.

The first real sniff of anything comes on Thursday the 13th of August. The morning has a 5ft south swell rolling in, but it's crossed by a 16 mph wind, so it's a bit messy. The combined energy is high, at 1183, but it's just not clean. It’s a marginal call at best. The afternoon goes downhill fast.

Friday the 14th and Saturday the 15th are much the same. The swell on Saturday jumps up to 8ft with 8-second period from the ENE, but it's a risk of thunderstorms and a solid 19 mph cross-shore wind. That's a lot of energy (1286) but the quality is just not there. By Sunday the 16th, the swell is 10ft with a short period, and the wind is still howling. That's expert territory size-wise, but with the wind and short period, it's a washing machine. Combined energy hits 2109, but it's not a surfer's energy.

From Monday the 17th through to the end of the period, it's a steady diet of small, weak swell and poor winds. The period is mostly short, and the energy drops off to a whisper. The 19th of August shows a small 2ft, 12-second south swell, but it's still cross-shore. The 20th and 21st see a longer period swell from the SSW, with periods around 17-18 seconds, but the swell is tiny at 2ft to 2ft. The long period is a positive for shape, but there's simply not enough size to make it worthwhile. The winds are mostly cross-on or cross-shore, and the energy is low, hovering around 273-689.

There is a slight uptick around the 24th of August and into the 27th, with a few sessions rated as marginal. The swell stays small, between 2ft and 3ft, with a long period from the SSW. The winds are still cross-shore, but lighter. Honestly, if you're desperate, the mornings of the 26th or 27th of August might offer the cleanest, weakest waves of the whole run. The periods are long (14-19 seconds), which is great for a reef setup like Ammonias, but the size is just a ripple.

There's no standout here. It's a poor run. The setup is more interesting for the wind than the waves. With that swell and strong cross-shore wind, it's a kite surfer's dream, not a paddle surfer's.

Rusty.

Short Range Forecast

Light rain (total 4mm), mostly falling on Sat morning. Warm (max 27°C on Thu morning, min 25°C on Wed night). Mainly fresh winds.

Days 5-7 Weather Summary

Heavy rain (total 26mm), heaviest during Sun night. Warm (max 26°C on Sun morning, min 25°C on Sat night). Mainly fresh winds.

Thursday
13
Friday
14
Saturday
15
Sunday
16
Monday
17
Tuesday
18
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
2
0
2
1
0
1
1
1
1
1
1
0
0
0
0
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)
1.5
S
16
1.4
S
16
1.3
S
15
1.3
S
15
1.2
S
14
2
ENE
8
2.3
ENE
8
2.5
ENE
8
3
ENE
9
3
E
9
3
ENE
8
2.5
ENE
8
2.4
ENE
8
2.1
ENE
7
1.9
ENE
7
1.7
ENE
7
1.5
ENE
7
1.4
ENE
7
1.3
ENE
7
Wave Graph
Metric surfscale
Energy kJ
1178
1004
784
743
598
496
589
979
1188
1641
1084
956
690
482
366
255
198
181
137
Wind (km/h)
20
ENE
25
NE
30
NE
25
NE
30
ENE
25
NE
25
NE
30
NE
35
NE
30
ENE
35
NE
30
NE
35
ENE
30
E
25
E
25
ENE
25
ENE
20
ENE
15
ENE
Wind State
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
High Tide
3:54AM0.34m
4:34PM0.66m
4:44AM0.37m
5:03PM0.59m
5:36AM0.41m
5:29PM0.52m
6:32AM0.43m
5:50PM0.44m
7:34AM0.46m
6:01PM0.36m
8:46AM0.48m
5:31PM0.30m
Low Tide
10:44PM0.10m
9:30AM-0.00m
11:09PM0.08m
10:17AM0.05m
11:35PM0.07m
11:06AM0.12m
00:00AM0.06m
12:01PM0.20m
00:26AM0.06m
1:11PM0.26m
00:55AM0.06m
3:13PM0.30m
1:28AM0.08m
clear
part cloud
clear
part cloud
part cloud
part cloud
part cloud
rain showers
thunderstorm
rain showers
thunderstorm
rain showers
mod rain
thunderstorm
light rain
light rain
part cloud
rain showers
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:13
6:13
6:15
6:15
6:15
6:16
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:09
7:08
7:08
7:07
7:07
7:06
7:06
 mm
2
2
4
2
1
10
5
2
1
1
Temp °C
25
27
27
26
26
27
26
26
26
25
26
26
25
25
25
25
26
26
25
Feels °C
24
26
26
25
24
25
25
26
25
24
25
24
24
24
25
25
26
26
25
  • 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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