Lough Allen

Lake Upper River Shannon lake known for angling and scenery

Part of the upper River Shannon system, Lough Allen spans the northwest Irish landscape; visitors come for kayaking, angling, cycling routes and quiet lakeside accommodation.

Main image

Lough Allen is a freshwater lake on the upper course of the River Shannon in northwest Ireland. It is one of the principal lakes in the Shannon basin and forms part of the river’s headwaters.

The lake is frequented for boating, fishing and shoreline walking, with a patchwork of small bays and islands that attract local outdoor recreation. Facilities and access points are modest and typically oriented to small boats and anglers.

Lough Allen is a glacially formed lake that has been part of inland transport and local economies along the Shannon since historic times. Its shoreline settlements developed around fishing and small-scale agriculture.

The lake lies within the Shannon basin in northwest Ireland, straddling parts of the surrounding counties and set among low hills and agricultural land in the region.

  • Navigation and recreation: The lake forms part of the upper River Shannon system and is used for recreational boating and angling; local conditions can change quickly so check with local harbours or clubs before heading out.
Lough Allen
Lough Allen, counties Leitrim/Longford/Roscommon, Ireland
54.1167, -8.0500
Public access (24 hours)
Free (public water)

How to Get to Lough Allen #

Drive via the N4 and local regional roads (R280). Towns such as Drumshanbo and Carrick-on-Shannon provide bases for exploring the lake; small marinas and boat rental services operate seasonally.

Tips for Visiting Lough Allen #

  • Explore the shoreline by kayak or small boat to reach quieter bays and birding sites.
  • Drive the R280 and local roads for scenic viewpoints along the lake's rim.
  • Visit in winter if interested in ice fishing; local operators provide equipment and guidance.

Best Time to Visit Lough Allen #

Summer and early autumn provide the best conditions for boating and fishing; winter is quieter and can be used for ice activities if conditions permit.

Summer
June-August · 15-22°C (59-72°F)
Pleasant for boating and fishing, and the lake is busiest with recreational users.
Autumn
September-October · 8-15°C (46-59°F)
Quieter with good light for photography and birdwatching.

Weather & Climate near Lough Allen #

Climate

Lough Allen's climate is classified as Oceanic - Oceanic climate with mild summers (peaking in July) and cold winters (coldest in January). Temperatures range from 2°C to 18°C. Abundant rainfall (1211 mm/year), wettest in January.

Best Time to Visit
JulyJuneAugust
Temperature & Rainfall
Temperature Range
27°
Warmest Month
-7°
Coldest Month
Monthly Conditions

January

January is the coolest month with highs of 8°C and lows of 2°C. The wettest month with heavy rain (129 mm) and mostly overcast skies.

38 Poor

Comfort

Feels Like Cold
C
Temperature
95%
Humidity
Very Humid

Weather

129 mm
Rainfall
4.2 m/s
Wind
Light Breeze
0.0
UV Index
Low
7.7h daylight

February

February is cold with highs of 8°C and lows of 3°C. Regular rainfall (98 mm) and mostly overcast skies.

42 Poor

Comfort

Feels Like Cold
C
Temperature
94%
Humidity
Very Humid

Weather

98 mm
Rainfall
4.2 m/s
Wind
Light Breeze
0.1
UV Index
Low
9.5h daylight

March

March is cold with highs of 9°C and lows of 4°C. Significant rainfall (104 mm) and mostly overcast skies.

48 Poor

Comfort

Feels Like Cold
C
Temperature
91%
Humidity
Very Humid

Weather

104 mm
Rainfall
4.2 m/s
Wind
Light Breeze
0.3
UV Index
Low
11.7h daylight

April

April is cold with highs of 12°C and lows of 5°C. Moderate rainfall (71 mm) and mostly overcast skies.

54 Acceptable

Comfort

Feels Like Cold
C
Temperature
12°
87%
Humidity
Very Humid

Weather

71 mm
Rainfall
3.7 m/s
Wind
Light Breeze
0.7
UV Index
Moderate
13.9h daylight

May

May is cool with highs of 14°C and lows of 7°C. Moderate rainfall (71 mm) and mostly overcast skies.

56 Acceptable

Comfort

11°
Feels Like Cool
11°C
Temperature
15°
85%
Humidity
Very Humid

Weather

71 mm
Rainfall
3.6 m/s
Wind
Light Breeze
1.1
UV Index
High
15.8h daylight

June

June is cool with highs of 17°C and lows of 10°C. Moderate rainfall (77 mm) and mostly overcast skies.

60 Good

Comfort

13°
Feels Like Cool
13°C
Temperature
10° 17°
84%
Humidity
Very Humid

Weather

77 mm
Rainfall
3.4 m/s
Wind
Light Breeze
1.3
UV Index
High
16.9h daylight

July

July is cool with highs of 18°C and lows of 12°C. Regular rainfall (81 mm) and mostly overcast skies.

62 Good

Comfort

15°
Feels Like Cool
15°C
Temperature
12° 18°
86%
Humidity
Very Humid

Weather

81 mm
Rainfall
3.3 m/s
Wind
Light Breeze
1.2
UV Index
High
16.4h daylight

August

August is cool with highs of 18°C and lows of 12°C. Significant rainfall (101 mm) and mostly overcast skies.

60 Good

Comfort

15°
Feels Like Cool
15°C
Temperature
12° 18°
87%
Humidity
Very Humid

Weather

101 mm
Rainfall
3.1 m/s
Wind
Light Breeze
0.9
UV Index
Moderate
14.7h daylight

September

September is cool with highs of 16°C and lows of 10°C. Significant rainfall (101 mm) and mostly overcast skies.

58 Acceptable

Comfort

13°
Feels Like Cool
13°C
Temperature
10° 16°
89%
Humidity
Very Humid

Weather

101 mm
Rainfall
3.3 m/s
Wind
Light Breeze
0.6
UV Index
Moderate
12.5h daylight

October

October is cool with highs of 13°C and lows of 8°C. Significant rainfall (127 mm) and mostly overcast skies.

50 Acceptable

Comfort

10°
Feels Like Cool
10°C
Temperature
13°
92%
Humidity
Very Humid

Weather

127 mm
Rainfall
3.6 m/s
Wind
Light Breeze
0.2
UV Index
Low
10.3h daylight

November

November is cold with highs of 10°C and lows of 5°C. Significant rainfall (126 mm) and mostly overcast skies.

46 Poor

Comfort

Feels Like Cold
C
Temperature
10°
95%
Humidity
Very Humid

Weather

126 mm
Rainfall
3.6 m/s
Wind
Light Breeze
0.1
UV Index
Low
8.3h daylight

December

December is cold with highs of 8°C and lows of 4°C. Significant rainfall (125 mm) and mostly overcast skies.

38 Poor

Comfort

Feels Like Cold
C
Temperature
95%
Humidity
Very Humid

Weather

125 mm
Rainfall
3.8 m/s
Wind
Light Breeze
0.0
UV Index
Low
7.1h daylight

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