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Co. Mayo · Marine Institute gauge

Tide times Roonagh

Roonagh Quay is the ferry pier for Clare Island and Inishturk, west of Louisburgh in Co. Mayo. The gauge serves Carrowmore and Old Head beaches and the Louisburgh coast.

Today, Fri, 16 Oct: high water at 09:20 (1.8 m) and 21:50 (1.4 m), low water at 02:55 and 15:30. The tide table below gives high and low water for the next 7 days, in Irish local time, and the calendar runs 30 days ahead. These predictions also serve Louisburgh, Carrowmore Beach, Old Head.

Water level today

m above OD Malin

00:0006:0012:0018:0024:00sunrise 08:08sunset 18:42LW 02:55-0.42 mHW 09:201.82 mLW 15:30-0.43 mHW 21:501.42 m

Tide table · next 7 days

Roonagh tide table: high and low water

Fri, 16 Oct

Irish local time

▽ Low

02:55

-0.42 m

▲ High

09:20

1.82 m

▽ Low

15:30

-0.43 m

▲ High

21:50

1.42 m

Sat, 17 Oct

▽ Low

03:35

-0.15 m

▲ High

10:05

1.60 m

▽ Low

16:20

-0.20 m

▲ High

22:45

1.20 m

Sun, 18 Oct

▽ Low

04:30

0.10 m

▲ High

11:00

1.40 m

▽ Low

17:40

-0.04 m

Mon, 19 Oct

▲ High

00:05

1.05 m

▽ Low

06:00

0.25 m

▲ High

12:25

1.27 m

▽ Low

19:15

-0.06 m

Tue, 20 Oct

▲ High

01:45

1.07 m

▽ Low

07:50

0.20 m

▲ High

13:50

1.32 m

▽ Low

20:35

-0.24 m

Wed, 21 Oct

▲ High

03:00

1.25 m

▽ Low

09:00

-0.02 m

▲ High

15:00

1.49 m

▽ Low

21:25

-0.49 m

Thu, 22 Oct

▲ High

03:50

1.50 m

▽ Low

09:45

-0.29 m

▲ High

15:45

1.72 m

▽ Low

22:05

-0.75 m

Heights in metres relative to OD Malin. Predictions © Marine Institute (CC BY 4.0). Weather can raise or lower actual levels. Allow a margin for safety.

Daylight

Sunrise and sunset in Roonagh

Today the sun rises at 08:08 and sets at 18:42, giving 10h 34m of daylight. A high tide after sunset is only useful to boats; for a swim or a walk match the tide to the daylight hours.

Calendar

Next 30 days in Roonagh

Month view of every high and low water. The range column is the gap between the day’s highest and lowest water: 3.9 m marks the biggest spring tide of the month, 1.3 m the quietest neap.

DateHigh waterLow waterRange
Fri, 16 Oct09:20 (1.8 m) · 21:50 (1.4 m)02:55 (-0.4 m) · 15:30 (-0.4 m)2.3 m
Sat, 17 Oct10:05 (1.6 m) · 22:45 (1.2 m)03:35 (-0.1 m) · 16:20 (-0.2 m)1.8 m
Sun, 18 Oct11:00 (1.4 m)04:30 (0.1 m) · 17:40 (-0.0 m)1.4 m
Mon, 19 Oct00:05 (1.1 m) · 12:25 (1.3 m)06:00 (0.3 m) · 19:15 (-0.1 m)1.3 m
Tue, 20 Oct01:45 (1.1 m) · 13:50 (1.3 m)07:50 (0.2 m) · 20:35 (-0.2 m)1.6 m
Wed, 21 Oct03:00 (1.3 m) · 15:00 (1.5 m)09:00 (-0.0 m) · 21:25 (-0.5 m)2.0 m
Thu, 22 Oct03:50 (1.5 m) · 15:45 (1.7 m)09:45 (-0.3 m) · 22:05 (-0.8 m)2.5 m
Fri, 23 Oct04:25 (1.8 m) · 16:25 (1.9 m)10:25 (-0.6 m) · 22:40 (-1.0 m)3.0 m
Sat, 24 Oct05:00 (2.0 m) · 17:05 (2.2 m)10:55 (-0.8 m) · 23:10 (-1.2 m)3.4 m
Sun, 25 Oct04:30 (2.2 m) · 16:40 (2.4 m)10:30 (-1.1 m) · 22:45 (-1.4 m)3.7 m
Mon, 26 Oct05:05 (2.4 m) · 17:20 (2.5 m)11:05 (-1.3 m) · 23:20 (-1.4 m)3.9 m
Tue, 27 Oct05:40 (2.5 m) · 18:00 (2.5 m)11:45 (-1.4 m)3.9 m
Wed, 28 Oct06:20 (2.5 m) · 18:45 (2.4 m)00:00 (-1.4 m) · 12:25 (-1.4 m)3.9 m
Thu, 29 Oct07:05 (2.5 m) · 19:35 (2.2 m)00:40 (-1.2 m) · 13:10 (-1.2 m)3.7 m
Fri, 30 Oct07:50 (2.3 m) · 20:30 (1.9 m)01:25 (-1.0 m) · 14:00 (-1.1 m)3.3 m
Sat, 31 Oct08:45 (2.1 m) · 21:35 (1.7 m)02:15 (-0.7 m) · 15:05 (-0.8 m)2.9 m
Sun, 1 Nov09:50 (1.8 m) · 22:50 (1.4 m)03:20 (-0.3 m) · 16:25 (-0.7 m)2.5 m
Mon, 2 Nov11:05 (1.7 m)04:45 (-0.1 m) · 17:55 (-0.6 m)2.3 m
Tue, 3 Nov00:20 (1.4 m) · 12:30 (1.7 m)06:20 (-0.1 m) · 19:15 (-0.7 m)2.4 m
Wed, 4 Nov01:35 (1.5 m) · 13:45 (1.8 m)07:35 (-0.3 m) · 20:15 (-0.9 m)2.6 m
Thu, 5 Nov02:30 (1.7 m) · 14:40 (1.9 m)08:30 (-0.5 m) · 21:00 (-1.0 m)2.9 m
Fri, 6 Nov03:20 (1.9 m) · 15:30 (2.0 m)09:20 (-0.7 m) · 21:40 (-1.1 m)3.1 m
Sat, 7 Nov03:55 (2.0 m) · 16:10 (2.1 m)10:00 (-0.9 m) · 22:20 (-1.1 m)3.2 m
Sun, 8 Nov04:35 (2.1 m) · 16:50 (2.1 m)10:35 (-1.0 m) · 22:50 (-1.1 m)3.2 m
Mon, 9 Nov05:10 (2.2 m) · 17:25 (2.1 m)11:10 (-1.1 m) · 23:25 (-1.0 m)3.3 m
Tue, 10 Nov05:40 (2.3 m) · 18:00 (2.0 m)11:45 (-1.1 m) · 23:55 (-0.9 m)3.3 m
Wed, 11 Nov06:15 (2.3 m) · 18:40 (1.9 m)12:20 (-1.0 m)3.2 m
Thu, 12 Nov06:50 (2.2 m) · 19:15 (1.8 m)00:25 (-0.8 m) · 12:55 (-0.9 m)3.1 m
Fri, 13 Nov07:20 (2.1 m) · 19:50 (1.6 m)01:00 (-0.6 m) · 13:30 (-0.7 m)2.8 m
Sat, 14 Nov08:00 (1.9 m) · 20:35 (1.5 m)01:35 (-0.4 m) · 14:10 (-0.6 m)2.5 m

Nearby

Beaches and harbours using Roonagh tides

These spots have no gauge of their own and take their times from Roonagh. Each has its own page with sunrise, a 30-day calendar and local safety notes.

Westport 26 kmBertra Beach 18 kmOld Head 8 kmLouisburgh 6 km

Nearest other gauges

Clare Island 5 kmKillary Harbour 15 kmLetterfrack 22 kmAchill Island 25 kmBallyglass 55 km

All tide times for Co. Mayo on one page.

Local pattern

Tides around Roonagh and the Co. Mayo coast

Clew Bay, with its drowned drumlin islands, is covered by Roonagh and Clare Island, while Achill has its own gauge and Ballyglass reads for the Mullet peninsula and Broadhaven Bay. Range is 4 to 5 m on springs. The bay is sheltered from the west by Clare Island, but the channels between the drumlins run fast and the flats around Westport and Newport dry for miles.

Keel and Keem on Achill, Old Head and Carrowmore near Louisburgh and the Mullet beaches at Elly Bay are all Blue Flag strands. Keel has a famous but strong rip at the eastern end of the beach, so stay in front of the lifeguard hut in season.

Mulranny and Bertra face the inner bay and are gentler, shelving strands suited to families at mid to high tide. Belmullet town has water on both sides and two tide regimes: Blacksod Bay to the south and Broadhaven to the north, both read from Ballyglass.

Questions

About these times

What time is high tide in Roonagh today?

The first high water in Roonagh today is at 09:20 Irish time, 1.8 m above OD Malin. The second high, low waters and the week ahead are in the table above. The data comes from Marine Institute astronomical predictions for the Roonagh gauge.

When is low tide in Roonagh today?

The first low water in Roonagh today is at 02:55 (-0.4 m relative to OD Malin). Low water is the time for the widest strand and for rock pools; the flood usually comes back noticeably within an hour.

How many high tides does Roonagh get a day?

Like all of Ireland, roughly two highs and two lows in every 24 hours and 50 minutes, so tide times shift about 50 minutes later each day.

How big is the tidal range at Roonagh?

Over the next 30 days the range at Roonagh runs from about 1.3 m on the smallest neap tide to 3.9 m on the biggest spring. The 30-day calendar below shows the range for every day.

How accurate are these times?

These are astronomical predictions: the moon and sun are extremely predictable, so times are typically accurate to within minutes. Actual water levels can differ with strong winds and air pressure (storm surge). For navigation-critical decisions, always check official sources.

Reading the table

Understanding the tide table

How to read the table

Each card is one calendar day in Irish local time. High water is marked with a triangle pointing up, low water with a triangle pointing down. The height beside each time is the predicted level in metres above Ordnance Datum Malin, the same datum used on Irish Ordnance Survey maps. A bigger number means more water over the sand, the slip or the rocks.

Most days have two highs and two lows. Every so often a day has only three events. That is normal: the tidal cycle is about 12 hours 25 minutes long, so one high or low slips over midnight into the next day.

The clock runs on Europe/Dublin time, so the tables already account for the change to and from summer time. You never need to add or subtract an hour.

Spring tides and neap tides

Around full moon and new moon the sun and moon pull together and the tide swings furthest: very high highs and very low lows. These are spring tides, and they arrive roughly every two weeks all year round, nothing to do with the season. At the quarter moons the range shrinks and you get neap tides, when the water barely moves off the beach.

You can spot springs in the tables without a calendar. Look for the days where the gap between high and low is largest. Those are the mornings when the widest strand appears at low water, and the evenings when the sea comes right up to the wall.

The largest springs of the year, around the March and September equinoxes, are the ones that flood car parks and coastal roads if they coincide with an onshore gale.

Why weather changes the real level

These predictions only account for the moon and the sun. Air pressure and wind are ignored, because nobody can forecast them weeks ahead. A deep Atlantic low can lift the sea by 30 to 50 cm (a positive surge) and a strong onshore wind piles water against the coast on top of that. High pressure and offshore winds do the opposite.

In practice the times are very reliable and the heights are reliable in settled weather. In a storm, treat the predicted high water as a floor rather than a ceiling, and add the surge that Met Éireann mentions in the sea area forecast.

Best times for swimming, walking and fishing

Swimmers on a shelving beach usually want the hour either side of high water, when the water is deep close in and you are not wading out over 100 m of sand. At steep-to spots such as harbour steps or the Forty Foot, mid tide to high tide is safest because the ladder still reaches the water.

Walkers, rock poolers and dog owners want low water. Aim to arrive an hour before the predicted low, which gives you two hours of falling and slack water before the flood starts to come back in. On sand flats and around tidal islands the flood can return faster than walking pace, so know your low water time before you set off.

Shore anglers generally fish the last two hours of the flood and the first hour of the ebb. Boat owners need the height as much as the time: a slip that dries at 1.0 m is unusable at a 0.6 m low.

Sources

Sources and method

Every time and height on this page is an astronomical prediction from the Marine Institute of Ireland for the Roonagh tide gauge, taken from the open IMI_TidePrediction_HighLow dataset on the Institute’s ERDDAP server. We download the data and rebuild every page each night, convert the UTC timestamps to Irish local time (IST in summer, GMT in winter) and group them into calendar days. Nothing is estimated or smoothed by us.

Heights are metres above Ordnance Datum Malin, the reference used on Irish charts and Ordnance Survey maps. To compare with a chart that uses Lowest Astronomical Tide, add the local LAT to OD Malin offset shown on the chart.

Data licence: CC BY 4.0, Marine Institute. Page rebuilt 16 October 2026. Predictions ignore weather: onshore gales and low pressure can add half a metre or more to the real level. For navigation use official Admiralty or Irish Lights publications alongside this page.

Elsewhere on the coast

More tide times

All of Co. MayoDublinGalwayCorkCo. KerryCo. DonegalSalthillTramorePortmarnockSpring and neap tide dates