Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 7 am 20 Jul 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.7° C
0.3° 

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


Ammonias surf forecast from 21 Jul 2026:

  • Most powerful swell: Monday 27 Jul, 11AM (local time) - 5ft (1.5m), 15s period, E swell with 979 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 1.5m 15s and forecast to arrive on Monday (Jul 27) at 11AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 7s period and expected on Monday (Jul 27) at 8AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful11AM (Mon 27th Jul)5ft (1.5m) 15s

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


The Lowdown

Alright, Rusty here, and I've got a long look ahead for us at Ammonias. Let's be honest, it's a bit of a mixed bag over the next couple of weeks, so let's get straight into it.

The water is sitting at 80°, which is about 0.5° warmer than usual for this time of year. Nothing wild, just a touch of warmth.

We're starting off slow. The first few days, from Monday the 20th through to the end of the week, are a real struggle. The swell is weak and the wind is a messy cross-shore, keeping things chopped up. The wave energy is moderate at best, going from 543 up to 1182, but the quality just isn't there. The forecast calls it marginal or poor, and I trust that. It's a lot of movement in the water, but not the kind that makes for a good ride. You'll be battling a cross-chop.

Now, we hit a bit of a dry spell. Friday the 24th afternoon through to the 27th, we see some size and a bump in energy, with the swell climbing to 5 ft from the ENE and E, but it's still that cross-shore wind. The period is short, around 7 to 8 seconds, so the waves will be a bit weak and crumbly. The energy levels are moderate to strong (1242 to 1812), but the conditions are described as marginal. It's surfable, but not a standout.

The real standout window, the one that has me packing my bags, starts on the 29th of July. The Wednesday morning and afternoon are looking like the best on offer. We’ve got a 7 ft to 8 ft swell from the ENE, with a 13-second period. That's a nice, long groundswell that will wrap in with some proper punch. The combined energy is a solid 1933 to 1949, which is strong wave energy. The wind is a gentle breeze from the ENE and NE, which is a clean cross-shore. This is the one to target. The crowd situation at Ammonias is often busy, so you'll want to be up early for a piece of it. The size is hefty, over 7 ft, so this is strictly for the experienced crew.

After that little burst, things drop off again. The 30th of July sees a fade to smaller, weaker S swell, and the wind swings cross-onshore, making a mess of things. The energy drops to 327, which is weak. It's a dead zone again.

The second week of the forecast, from the 31st of July, is pretty lackluster. The swell stays small, mostly from the ENE with a short 8-second period, and the wind is either cross or cross-onshore. The energy is low, between 321 and 607. The 31st of July afternoon has a little bump to 5 ft, but it's still a short-period, weak swell, and the conditions are described as poor. It's not looking worth the paddle.

So, to sum it up: the best bet is the Wednesday the 29th of July. That's your window for a proper, powerful groundswell. Everything else is a bit of a grind or a flat spell. Keep an eye on that date.

Rusty, signing off.

Short Range Forecast

Moderate rain (total 17mm), heaviest on Tue night. Warm (max 26°C on Mon morning, min 24°C on Mon night). Wind will be generally light.

Days 4-6 Weather Summary

Light rain (total 8mm), mostly falling on Thu night. Warm (max 26°C on Thu afternoon, min 23°C on Fri night). Mainly fresh winds.

Monday
20
Tuesday
21
Wednesday
22
Thursday
23
Friday
24
Saturday
25
Sunday
26
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
1
1
1
0
0
1
0
1
0
1
0
1
1
2
1
2
2
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)
1.4
ENE
7
1.5
ENE
7
1.3
ENE
7
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
0.8
SSW
18
0.9
SSW
17
2.2
ENE
8
2.1
ENE
8
1
SSW
18
1
SSW
18
1.2
E
16
1.3
E
16
1.3
E
15
Wave Graph
Metric surfscale
Energy kJ
220
234
178
275
320
352
437
564
480
528
399
469
356
456
557
520
731
662
732
838
736
Wind (km/h)
25
NE
25
NE
20
ENE
20
ENE
20
ENE
20
ENE
25
ENE
25
ENE
25
ENE
25
ENE
25
ENE
25
ENE
30
ENE
25
NE
25
ENE
25
NE
25
ENE
20
ENE
25
ENE
25
NE
20
NE
Wind State
cross
cross
cross
cross
cross
cross-on
cross-on
cross
cross-on
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
High Tide
9:50AM0.41m
7:25PM0.35m
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
Low Tide
2:53PM0.29m
2:52AM0.04m
3:30AM0.04m
4:16AM0.04m
5:07AM0.04m
10:06PM0.17m
6:00AM0.03m
10:10PM0.16m
6:48AM0.01m
10:20PM0.16m
rain showers
clear
part cloud
rain showers
rain showers
rain showers
rain showers
clear
clear
part cloud
clear
rain showers
rain showers
rain showers
part cloud
rain showers
rain showers
rain showers
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:03
6:05
6:05
6:05
6:05
6:05
6:07
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:22
7:22
7:21
7:21
7:21
7:20
7:20
 mm
1
2
2
7
5
2
2
1
1
1
1
Temp °C
26
26
25
26
26
25
25
25
24
25
26
24
25
25
24
25
25
24
25
25
24
Feels °C
25
24
24
26
26
26
24
24
23
24
25
23
23
23
22
24
24
22
24
23
22
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  • 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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