Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 7 pm 12 Jul 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.3° 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 Jul 2026:

  • Most powerful swell: Monday 13 Jul, 5AM (local time) - 7ft (2.1m), 8s period, ENE swell with 501 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 2.1m 8s and forecast to arrive on Monday (Jul 13) at 5AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 7s period and expected on Tuesday (Jul 14) at 11AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 5AM (Mon 13th Jul)7ft (2.1m) 8s

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


G’day, Rusty here. Let’s be real—Ammonias is a reef break that’s fairly consistent but we’ve got a tricky run ahead. The first real surf worth paddling out for shows up on Monday morning, 13 July, with a 6ft swell from the ENE, period short at 8 seconds, and moderate cross-shore wind from the NE at 16 mph. The combined wave energy is moderate (712). It’s not clean, but it’s the best we’ve got to start with. Break is exposed, so it’ll take that swell. Crowds can be around sometimes, so you might have company.

The water temp is about average for the time of year, nothing unusual.

Monday afternoon sees the swell dip a touch to 5ft, still ENE, still cross-shore wind, energy down to 599. Still rideable but marginal.

Then we hit a dry spell. Tuesday 14 July through Sunday 19 July offers nothing but poor surf conditions—mostly cross-on winds, short period junk, or tiny swells. Some days have rain showers. The odd afternoon on Saturday 18 July has a 2ft SW swell with a long 14-second period and moderate cross-shore wind, but it’s only marginal at best. Not worth suiting up for.

We get a little flicker of hope Monday 20 July morning: 5ft ENE, short period, cross-shore wind, but still poor. Afternoon is tiny.

From Tuesday 21 July through Thursday 23 July mornings, it’s mostly marginal, with S swells around 3ft to 3ft, long periods 13–15 seconds, and cross-shore winds. The energy is moderate (549–652). It’s clean enough for a go if you’re desperate, but not a standout.

Now here’s where it gets interesting. The standout window is Friday 24 July through Sunday 26 July. Friday morning we see 6ft from the ENE, short period 7 seconds, but cross-shore wind from the NE at 12 mph. Combined energy is strong (824). Friday afternoon holds at 6ft ENE, still cross-shore, energy 744. Saturday 25 July morning is 6ft ENE, 8-second period, gentle cross-on wind from the E at 9 mph—still poor, but Saturday afternoon shows 6ft ENE, cross-shore, energy 834. Sunday 26 July keeps the 6ft to 6ft ENE swell, cross-shore, energy 787–857. This is the best stretch of the forecast: consistent chest-to-head-high waves, moderate energy, and the wind is mostly cross-shore, not too messy. It’s not glassy, but it’s the most surfable run we’ve got. The swell direction (ENE) is not the optimum for Ammonias (which likes SSE), but it’s still exposed, so it’ll work. These waves are a bit short-period, so expect a bit of a closeout on the reef, but there’ll be fun ones.

After that, Monday 27 July and Tuesday 28 July drop back to 3ft from the E, longer period 13–14 seconds, cross-shore wind, moderate energy (523–635). Marginal again.

The biggest gap of no real surf is from Tuesday 14 July through Sunday 19 July—six days of poor conditions. The week after that is where the action is, especially Friday 24 July to Sunday 26 July. That’s your best bet. Forecasts can change, but for now, mark those dates.

Rusty.

Short Range Forecast

Moderate rain (total 13mm), heaviest on Sun night. Warm (max 25°C on Mon morning, min 23°C on Mon night). Wind will be generally light.

Days 5-7 Weather Summary

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

Monday
13
Tuesday
14
Wednesday
15
Thursday
16
Friday
17
Saturday
18
Sun
19
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Rating
(10 max)
0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
2.1
ENE
8
1.8
ENE
8
1.6
ENE
8
1.5
ENE
7
0.7
SW
14
0.7
SW
14
0.6
SSW
17
1.3
ENE
7
0.9
ENE
7
0.8
SSW
16
0.6
SSW
16
1.4
ENE
7
1.6
ENE
7
1.6
ENE
7
1.5
ENE
7
0.6
S
15
0.6
S
14
1.5
ENE
7
1.3
ENE
7
1.4
ENE
7
1.6
ENE
7
Wave Graph
Metric surfscale
Energy kJ
522
383
288
222
189
186
200
178
91
314
179
180
206
230
198
157
144
210
152
208
276
Wind (km/h)
25
ENE
25
NE
20
NE
20
NE
20
NE
20
ENE
15
ENE
20
E
15
E
15
E
20
E
25
ENE
20
ENE
25
ENE
20
ENE
20
ENE
20
ENE
25
ENE
20
ENE
25
ENE
25
ENE
Wind State
cross
cross
cross
cross
cross
cross
cross
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross
cross
cross-on
cross
cross
cross-on
cross
High Tide
2:08AM0.19m
3:47PM0.78m
3:04AM0.21m
4:29PM0.77m
3:58AM0.23m
5:08PM0.73m
4:55AM0.26m
5:45PM0.67m
5:57AM0.28m
6:18PM0.59m
7:07AM0.31m
6:48PM0.51m
8:26AM0.35m
7:13PM0.43m
Low Tide
10:34PM0.12m
7:55AM-0.11m
11:06PM0.11m
8:46AM-0.10m
11:38PM0.10m
9:34AM-0.07m
00:10AM0.09m
10:22AM-0.02m
00:42AM0.08m
11:11AM0.05m
1:14AM0.06m
12:04PM0.14m
1:46AM0.05m
1:11PM0.23m
rain showers
clear
part cloud
rain showers
rain showers
clear
clear
rain showers
rain showers
rain showers
rain showers
rain showers
clear
clear
clear
part cloud
rain showers
clear
clear
clear
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:01
6:01
6:01
6:03
6:03
6:03
6:03
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:23
7:23
7:22
7:22
7:22
7:22
7:22
7:22
 mm
5
2
1
1
4
6
2
1
2
2
Temp °C
24
25
25
24
25
25
24
25
25
25
26
26
25
26
26
25
26
26
25
26
26
Feels °C
23
23
24
23
24
24
23
25
26
26
27
26
25
25
26
26
27
26
26
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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