Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 1 pm 29 Jul 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.4° 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 30 Jul 2026:

  • Best quality surf: Wednesday 29 Jul, 11PM (local time) - 2.5ft (0.8m), 14s period, S swell with glassy winds.
  • Most powerful swell: Sunday 2 Aug, 2AM (local time) - 8ft (2.5m), 8s period, ENE swell with 979 kJ wave energy.
  • Next surfable swell (1★+): Wednesday 29 Jul, 11PM (local time) - 2.5ft (0.8m), 14s period with S swell.

Best Forecast Surf Conditions for Ammonias this week:

The surf forecast for Ammonias over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Jul 29) at 11PM. The primary swell is predicted to be 0.8m and 14s period. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Ammonias in the next 16 days are 2.5m 8s and forecast to arrive on Sunday (Aug 02) 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 9s period and expected on Wednesday (Jul 29) at 11PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)11PM (Wed 29th Jul)2.5ft (0.8m) 14s
Best Surf11PM (Wed 29th Jul)2.5ft (0.8m) 14s
Most Powerful 2AM (Sun 2nd Aug)8ft (2.5m) 8s

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


The Lowdown

Alright folks, Rusty here. We’ve got a bit of a mixed bag on the horizon for Ammonias over the next couple of weeks. The pattern starts with a decent pulse on Wednesday the 29th of July, but then everything goes a bit pear-shaped for a long stretch.

The first real standout is on Wednesday afternoon, the 29th of July. Ammonias is looking at a solid 6 ft swell coming out of the ENE, with a period of 10 seconds. The wind is a nice light NNE breeze, blowing cross-offshore, which is going to keep things clean. The wave energy is moderate, sitting at 841. The water temperature is 80°, which is about average for this time of year. This is the highlight of the whole window—clean, punchy reef waves with a decent push. If you can get out of work early, this is the session to chase.

Now, don’t get too excited about the rest of the week. From Thursday the 30th of July, the wind swings onshore and stays there. We get a mix of small, short-period swell and cross-onshore winds that chop everything up. Thursday morning has a tiny 3 ft S swell with a long 13-second period, but the cross-on wind kills it. That pattern pretty much holds through the weekend and into the following week. The swell sticks around the 5 ft to 8 ft mark, but it’s almost all short-period ENE windswell, and the wind stays cross or cross-on, making it lumpy and messy. By Saturday the 1st of August, the swell hits 8 ft with a short 8-second period and fresh cross-winds—that’s getting into expert-only territory for size, but the quality is poor, so it’s more of a kite-surfing setup than a paddle session.

We’ve got a real dry spell. From Thursday the 30th of July right through to about the 8th of August, the surf quality is consistently rated as poor. There are a few mornings where conditions are “marginal,” but nothing worth getting excited about. The wind is relentless from the ENE, and the swell is mostly short-period junk.

There’s a flicker of hope on the 9th of August (Sunday) and into the 10th. A long-period SSW groundswell rolls in, with periods of 17 seconds and swell heights around 3 ft to 3 ft. That’s a long, clean groundswell, but it’s small. The wind is still cross-shore, so it’s not hopeless, but it’s a very long way from the quality of that Wednesday afternoon. The energy is moderate (779 and 745), but the size is just too small to get excited about.

The rest of the second week fades out into small, short-period junk with onshore winds again. The SSW swell sticks around through the 11th and 12th, but it’s dropping and the wind turns onshore, so it’s not a goer.

In short: If you’re after a surf, the only real standout is Wednesday afternoon, the 29th of July. After that, you’re looking at a solid 10-day stretch of poor to marginal conditions. The 9th and 10th of August offer a glimpse of a long-period groundswell, but it’s small and the wind is still a factor. The rest is just washing machine conditions.

Rusty.

Short Range Forecast

Some drizzle, heaviest during Thu night. Warm (max 27°C on Wed afternoon, min 24°C on Fri night). Winds increasing (calm on Wed night, fresh winds from the ENE by Sat morning).

Days 5-7 Weather Summary

Light rain (total 4mm), mostly falling on Sat night. Warm (max 26°C on Sat afternoon, min 24°C on Sat night). Mainly fresh winds.

Wed
29
Thursday
30
Friday
31
Saturday
1
Sunday
2
Monday
3
Tuesday
4
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
3
2
0
0
0
0
0
0
1
1
1
1
0
1
1
0
1
1
2
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.7
ENE
10
0.9
S
14
0.9
S
13
1.5
ENE
8
0.8
S
13
1.6
ENE
7
1.9
ENE
7
2.3
ENE
7
2.5
E
8
2.5
ENE
8
2.5
ENE
8
2.5
ENE
8
2.2
ENE
9
2.1
ENE
8
1.8
ENE
8
1.5
ENE
8
1.4
ENE
8
1.5
ENE
12
1.5
ENE
11
1.3
ENE
11
Wave Graph
Metric surfscale
Energy kJ
540
297
284
263
214
292
394
532
890
812
979
907
732
588
446
313
256
614
534
372
Wind (km/h)
15
NNE
0
ENE
15
E
20
ENE
25
ENE
25
E
25
ENE
30
ENE
30
ENE
30
ENE
30
ENE
25
ENE
30
NE
20
NE
20
ENE
20
ENE
15
ENE
15
ENE
10
ENE
15
ENE
Wind State
cross-off
glassy
cross-on
cross-on
cross-on
cross-on
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross-on
cross
cross
High Tide
4:18PM0.66m
3:49AM0.27m
4:44PM0.65m
4:33AM0.29m
5:08PM0.61m
5:22AM0.32m
5:32PM0.57m
6:19AM0.34m
5:54PM0.51m
7:26AM0.38m
6:14PM0.44m
8:45AM0.44m
6:28PM0.37m
Low Tide
11:10PM0.13m
9:25AM0.00m
11:32PM0.11m
10:03AM0.04m
11:56PM0.09m
10:44AM0.09m
00:22AM0.07m
11:33AM0.16m
00:50AM0.05m
12:35PM0.23m
1:21AM0.04m
2:08PM0.29m
1:58AM0.03m
clear
part cloud
clear
clear
thunderstorm
cloud
part cloud
part cloud
part cloud
part cloud
rain showers
part cloud
clear
part cloud
part cloud
part cloud
cloud
part cloud
cloud
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:07
6:09
6:09
6:09
6:09
6:09
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:17
7:17
7:16
7:16
7:15
7:15
7:15
 mm
1
4
Temp °C
27
27
27
27
26
26
26
25
25
26
24
25
26
24
26
26
24
25
26
24
Feels °C
29
31
29
28
27
26
26
25
23
24
22
23
24
22
26
25
23
26
27
25
  • Map Icons:
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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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