Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 7 am 19 Jul 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.6° C
0.2° 

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


Ammonias surf forecast from 19 Jul 2026:

  • Most powerful swell: Saturday 25 Jul, 5PM (local time) - 3.5ft (1.0m), 18s period, SSW swell with 724 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 1.0m 18s and forecast to arrive on Saturday (Jul 25) at 5PM. 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 8s period and expected on Sunday (Jul 26) at 2PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 5PM (Sat 25th Jul)3.5ft (1.0m) 18s

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 over the next couple of weeks.

Overall, it's a pretty grim stretch for decent waves. The wind is locked in from the east-northeast almost every day, which is cross-shore here, and with a reef break like this, you really want something offshore to keep it from getting messy. The swell is all over the place, but the quality just isn't there. We're looking at a long run of poor conditions, with a few days that are barely marginal.

The first real chance to even think about paddling out is around Monday, July 21st. The swell drops right down to about 3 ft, but it shifts to the south with a very long period of 15 seconds. That's a proper groundswell, and the energy is moderate (611). The problem is the wind is still cross-shore, and the forecast is calling it marginal. The break is a reef, so a long period south swell like that can wrap in nicely, but without clean wind it's going to be a frustrating session.

The next sniff of anything better comes on Wednesday, July 23rd. The swell is tiny, only about 2 ft, but the period is a massive 24 seconds from the south-southwest. The combined energy jumps up to a strong 1013 early in the morning. That's a lot of power for a tiny wave, meaning it'll be very straight and walled up, but for a reef like Ammonias, it could offer a few long, clean lines if you can find the right spot. The wind is still cross-shore, so it's not a standout, but it's the most interesting day of the whole run.

The final week of July and into August is a write-off. The wind picks up, the swell gets sloppy, and the energy starts to fade. There's a bit of east-northeast swell mid-week, but it's short period, junky, and cross-shore. The water temperature sits around 80°, which is pretty average for this time of year, so no surprises there.

Honestly, for the whole 16 days, there are no real standouts. The best you can hope for is a marginal session on the morning of Wednesday the 23rd, and even that's a gamble. The rest of the time, with the consistent cross-shore breeze and lumpy conditions, the setup at Ammonias reef looks more interesting for a kite surfer than a paddle surfer.

Rusty, signing off.

Short Range Forecast

Light rain (total 5mm), mostly falling on Tue afternoon. Warm (max 26°C on Sun morning, min 24°C on Sun morning). Wind will be generally light.

Days 4-6 Weather Summary

Light rain (total 9mm), mostly falling on Wed night. Warm (max 26°C on Wed afternoon, min 23°C on Fri night). Mainly fresh winds.

Sunday
19
Monday
20
Tuesday
21
Wednesday
22
Thursday
23
Friday
24
Saturday
25
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
0
1
0
1
1
1
0
2
0
2
0
0
0
0
1
2
1
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)
1.5
ENE
8
1.4
ENE
8
1.4
ENE
8
1.4
ENE
7
1.4
ENE
7
1.5
ENE
7
0.9
S
15
0.9
S
14
1.7
ENE
7
0.6
SSW
24
0.6
SSW
23
0.7
SSW
22
0.8
SSW
20
0.7
SSW
20
0.9
SSW
18
0.8
SSW
18
2.1
ENE
7
2.2
ENE
8
2.1
ENE
8
1
SSW
18
1
SSW
18
Wave Graph
Metric surfscale
Energy kJ
264
237
214
208
220
206
343
320
285
437
426
480
528
399
469
376
444
572
502
724
662
Wind (km/h)
20
ENE
25
ENE
20
ENE
20
ENE
25
NE
20
NE
20
ENE
20
ENE
25
ENE
20
ENE
25
ENE
20
ENE
30
ENE
25
ENE
25
ENE
25
ENE
25
ENE
20
ENE
25
ENE
25
NE
20
NE
Wind State
cross
cross
cross
cross
cross
cross
cross
cross
cross-on
cross
cross
cross
cross-on
cross
cross-on
cross
cross
cross
cross
cross
cross
High Tide
8:26AM0.35m
7:13PM0.43m
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
Low Tide
1:11PM0.23m
2:18AM0.05m
2:53PM0.29m
2:52AM0.04m
3:30AM0.04m
4:16AM0.04m
5:07AM0.04m
10:06PM0.17m
6:00AM0.03m
10:10PM0.16m
clear
clear
clear
clear
clear
part cloud
part cloud
rain showers
rain showers
part cloud
clear
rain showers
rain showers
clear
rain showers
rain showers
clear
rain showers
rain showers
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:03
6:03
6:05
6:05
6:05
6:05
6:05
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:22
7:22
7:22
7:21
7:21
7:21
7:20
 mm
2
3
1
2
2
1
3
1
Temp °C
26
26
25
25
26
24
26
26
25
25
26
24
25
25
24
25
26
24
25
25
24
Feels °C
25
24
24
24
25
24
26
25
25
24
25
23
23
23
23
24
25
22
24
23
23
  • 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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