Harlech Water Temperature

Harlech is a town close to Irish Sea. August is the month with the highest water temperature at 61.9°F / 16.6°C.
The coldest month is February with an average water temperature of 45.5°F / 7.5°C.
March is the driest at 1.5in / 38.7mm and December the wettest month with 6.3in / 160.7mm.
With an average air temperature of 58.8°F / 14.9°C, July is the warmest month in a year. February is the coldest with 39.6°F / 4.2°C average air temperature.
The Climate is described as temperate oceanic climate with warm summer. Best time to Visit would be in June, July, August, September.

Harlech Summary

Description Value
Current water temperature /
Warmest Month Water Temperature: August with 16.6°C / 61.9°F
Coldest Month Water Temperature: February with 7.5°C / 45.5°F
Warmest Month Air Temperature: July with 14.9°C / 58.8°F
Coldest Month Air Temperature: February with 4.2°C / 39.6°F
Wettest Month: December with 160.7mm / 6.3in
Driest Month: March with 38.7mm / 1.5in
Highest Humidity December with 89%
Lowest Humidity May with 79.4%
Best Time to Visit: June, July, August, September
Climate Classification temperate oceanic climate with warm summer

Harlech water temperature by month

Irish Sea water temperature by month

Max. Water

Temperature (°C)

ø. Water

Temperature (°C)

Min. Water

Temperature (°C)

January

8.9 8.3 7.8

February

7.8 7.6 7.4

March

8.1 7.6 7.3

April

10 9 8.1

May

12.6 11.2 10.1

June

14.8 13.7 12.6

July

16.3 15.7 14.8

August

16.7 16.5 16.2

September

16.5 16 15.3

October

15.3 14.4 13.3

November

13.2 12.1 10.9

December

10.8 9.9 8.9

Irish Sea water temperature by month

Max. Water

Temperature (°F)

ø. Water

Temperature (°F)

Min. Water

Temperature (°F)

January

48 46.9 46

February

46 45.7 45.3

March

46.6 45.7 45.1

April

50 48.2 46.6

May

54.7 52.2 50.2

June

58.6 56.7 54.7

July

61.3 60.3 58.6

August

62.1 61.7 61.2

September

61.7 60.8 59.5

October

59.5 57.9 55.9

November

55.8 53.8 51.6

December

51.4 49.8 48
The highest water temperature will be reached in August with around 61.9°F / 16.6°C. The lowest in February with an average water temperature of 45.5°F / 7.5°C.

Harlech weather today & 14-day weather forecast

Date
Weather
Max. F
Min. F
Max. C
Min. C
Windspeed
Windir.
Precip.
Rainrisk
Rel. Humidity
Sep. 23
Overcast clouds
58 °F
57°F
15 °C
14°C
2mph (3km/h)
west
0in (0mm)
0 %
76%
Sep. 24
Overcast clouds
62 °F
57°F
17 °C
14°C
3mph (4km/h)
southwest
0in (2mm)
60 %
91%
Sep. 25
Overcast clouds
63 °F
61°F
17 °C
16°C
2mph (3km/h)
south
0in (1mm)
55 %
94%
Sep. 26
Overcast clouds
64 °F
59°F
18 °C
15°C
4mph (7km/h)
south
0in (1mm)
50 %
85%
Sep. 27
Moderate rain
53 °F
47°F
12 °C
8°C
4mph (6km/h)
southwest
0in (11mm)
90 %
87%
Sep. 28
Heavy rain
56 °F
46°F
13 °C
8°C
3mph (5km/h)
south
1in (24mm)
95 %
94%
Sep. 29
Scattered clouds
52 °F
42°F
11 °C
6°C
2mph (4km/h)
west-northwest
0in (0mm)
15 %
86%
Date
Weather
Max. F
Min. F
Max. C
Min. C
Windspeed
Windir.
Precip.
Rainrisk
Rel. Humidity
Sep. 30
Overcast clouds
53 °F
44°F
12 °C
7°C
1mph (2km/h)
south-southwest
0in (0mm)
20 %
91%
Oct. 01
Light shower rain
55 °F
47°F
13 °C
8°C
1mph (2km/h)
west-southwest
0in (3mm)
75 %
90%
Oct. 02
Overcast clouds
50 °F
45°F
10 °C
7°C
1mph (2km/h)
west-southwest
0in (1mm)
35 %
87%
Oct. 03
Overcast clouds
53 °F
45°F
11 °C
7°C
1mph (2km/h)
southeast
0in (2mm)
65 %
87%
Oct. 04
Scattered clouds
52 °F
45°F
11 °C
7°C
1mph (2km/h)
west-northwest
0in (0mm)
15 %
94%
Oct. 05
Scattered clouds
46 °F
42°F
8 °C
6°C
2mph (3km/h)
northwest
0in (0mm)
20 %
93%
Oct. 06
Overcast clouds
53 °F
43°F
11 °C
6°C
1mph (2km/h)
south-southeast
0in (0mm)
0 %
95%
Oct. 07
Light rain
53 °F
50°F
12 °C
10°C
2mph (3km/h)
west-southwest
0in (6mm)
85 %
99%
Oct. 08
Light rain
48 °F
43°F
9 °C
6°C
2mph (3km/h)
south-southwest
0in (9mm)
90 %
92%

Harlech weather by month / climate table

Max.

Temperature

°C

ø.

Temperature

°C

Min.

Temperature

(°C)

Precip.

(mm)

Rainy Days

(d)

Rel. Humidity

(%)

January

7 4.4 1.4 135.4 17 88.6%

February

7.1 4.2 1.1 100.6 10 85.7%

March

9.7 5.3 0.4 39.7 7 83.1%

April

13.2 7.7 2.8 40.5 6 79.6%

May

15 10.6 5.5 45.3 10 79.4%

June

18.3 13.3 8.9 38.7 7 80.2%

July

18.9 14.9 11.1 50.6 16 82.1%

August

18.4 14.6 11 125.4 19 84.7%

September

17.2 13 8.9 59.1 11 84.4%

October

14.8 10.3 6.4 120 0 85.7%

November

11.2 7.2 3 145.5 17 88.3%

December

8.1 5.1 1.5 160.7 17 89%

Max.

Temperature

°F

ø.

Temperature

°F

Min.

Temperature

(°F)

Precip.

(in)

Rainy Days

(d)

Rel. Humidity

(%)

January

44.6 39.9 34.5 5.3 17 88.6%

February

44.8 39.6 34 4 10 85.7%

March

49.5 41.5 32.7 1.6 7 83.1%

April

55.8 45.9 37 1.6 6 79.6%

May

59 51.1 41.9 1.8 10 79.4%

June

64.9 55.9 48 1.5 7 80.2%

July

66 58.8 52 2 16 82.1%

August

65.1 58.3 51.8 4.9 19 84.7%

September

63 55.4 48 2.3 11 84.4%

October

58.6 50.5 43.5 4.7 0 85.7%

November

52.2 45 37.4 5.7 17 88.3%

December

46.6 41.2 34.7 6.3 17 89%
The warmest avg. temperature is around 58.8°F / 14.9°C, July is the month with the highest temperature. February is the coolest with 39.6°F / 4.2°C average air temperature. March is the month with the min. precipitation of 1.5in / 38.7mm and December with the max. precipitation in a year with 6.3in / 160.7mm.

Activities & POI in Harlech

Type of Activity List
Attraction Harlech Castle
Golf Course Royal Saint Davids Golf Course
Caravan Site Castle View Holiday Park
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