Caernarfon Water Temperature

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Caernarfon is a town close to Irish Sea. August is the month with the warmest water temperature at 59.9°F / 15.5°C. The coolest month is March with an avg. water temperature of 45.1°F / 7.3°C. March is the sunniest at 1.1in / 27.4mm and December the wettest month with 6.3in / 158.9mm. The average air temperature is around 58.8°F / 14.9°C, July is the hottest month in a year. February is the coolest with 40.6°F / 4.8°C average air temperature. temperate oceanic climate with warm summer would be the climate here. June, July, August, September would be the best time to visit.

Caernarfon Summary

Description Value
Current water temperature /
Warmest Month Water Temperature: August with 15.5°C / 59.9°F
Coldest Month Water Temperature: March with 7.3°C / 45.1°F
Warmest Month Air Temperature: July with 14.9°C / 58.8°F
Coldest Month Air Temperature: February with 4.8°C / 40.6°F
Wettest Month: December with 158.9mm / 6.3in
Driest Month: March with 27.4mm / 1.1in
Highest Humidity December with 85.1%
Lowest Humidity May with 78.9%
Best Time to Visit: June, July, August, September
Climate Classification temperate oceanic climate with warm summer

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Caernarfon water temperature by month

Irish Sea water temperature by month

Max. Water

Temperature (°C)

ø. Water

Temperature (°C)

Min. Water

Temperature (°C)

January

9.2 8.5 8

February

8 7.6 7.4

March

7.7 7.3 7.1

April

9 8.3 7.6

May

11.2 10 9

June

13.4 12.3 11.2

July

15.1 14.3 13.4

August

15.7 15.4 15

September

15.7 15.4 14.9

October

15 14.2 13.3

November

13.3 12.2 11.1

December

11 10.1 9.2

Irish Sea water temperature by month

Max. Water

Temperature (°F)

ø. Water

Temperature (°F)

Min. Water

Temperature (°F)

January

48.6 47.3 46.4

February

46.4 45.7 45.3

March

45.9 45.1 44.8

April

48.2 46.9 45.7

May

52.2 50 48.2

June

56.1 54.1 52.2

July

59.2 57.7 56.1

August

60.3 59.7 59

September

60.3 59.7 58.8

October

59 57.6 55.9

November

55.9 54 52

December

51.8 50.2 48.6
The warmest water temperature are in August with around 59.9°F / 15.5°C. The coldest in March with an average water temperature of 45.1°F / 7.3°C.

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Caernarfon weather today & 14-day weather forecast

Date
Weather
Max. F
Min. F
Max. C
Min. C
Windspeed
Windir.
Precip.
Rainrisk
Rel. Humidity
Jul. 09
Scattered clouds
68 °F
60°F
20 °C
15°C
1mph (2km/h)
west-southwest
0in (0mm)
20 %
81%
Jul. 10
Few clouds
69 °F
56°F
21 °C
13°C
1mph (2km/h)
south-southwest
0in (0mm)
0 %
83%
Jul. 11
Clear Sky
76 °F
56°F
24 °C
14°C
1mph (2km/h)
south-southwest
0in (0mm)
0 %
70%
Jul. 12
Few clouds
82 °F
62°F
28 °C
17°C
1mph (2km/h)
south
0in (0mm)
0 %
67%
Jul. 13
Few clouds
80 °F
66°F
27 °C
19°C
1mph (2km/h)
south-southeast
0in (0mm)
0 %
50%
Jul. 14
Light shower rain
71 °F
61°F
22 °C
16°C
2mph (3km/h)
south-southwest
0in (2mm)
55 %
72%
Jul. 15
Heavy rain
61 °F
55°F
16 °C
13°C
2mph (3km/h)
west
1in (21mm)
90 %
90%
Date
Weather
Max. F
Min. F
Max. C
Min. C
Windspeed
Windir.
Precip.
Rainrisk
Rel. Humidity
Jul. 16
Broken clouds
62 °F
57°F
17 °C
14°C
3mph (4km/h)
southwest
0in (1mm)
40 %
90%
Jul. 17
Broken clouds
65 °F
57°F
18 °C
14°C
2mph (4km/h)
south-southwest
0in (0mm)
20 %
90%
Jul. 18
Overcast clouds
66 °F
59°F
19 °C
15°C
1mph (2km/h)
south-southwest
0in (0mm)
0 %
83%
Jul. 19
Overcast clouds
66 °F
60°F
19 °C
15°C
1mph (2km/h)
south-southwest
0in (1mm)
20 %
85%
Jul. 20
Broken clouds
66 °F
56°F
19 °C
13°C
3mph (5km/h)
southwest
0in (1mm)
20 %
82%
Jul. 21
Broken clouds
67 °F
54°F
19 °C
12°C
3mph (4km/h)
southwest
0in (0mm)
20 %
86%
Jul. 22
Heavy rain
60 °F
55°F
15 °C
13°C
2mph (3km/h)
west-southwest
1in (32mm)
95 %
97%
Jul. 23
Broken clouds
63 °F
54°F
17 °C
12°C
2mph (3km/h)
northwest
0in (1mm)
25 %
84%
Jul. 24
Few clouds
65 °F
55°F
19 °C
13°C
2mph (3km/h)
east
0in (0mm)
0 %
79%

Caernarfon weather by month / climate table

Max.

Temperature

°C

ø.

Temperature

°C

Min.

Temperature

(°C)

Precip.

(mm)

Rainy Days

(d)

Rel. Humidity

(%)

January

7.5 5 2 132.4 17 84.9%

February

7.4 4.8 2.1 92.4 13 82.8%

March

9.4 5.7 1.3 27.4 9 81.6%

April

12.5 7.8 3.5 53.5 6 79.2%

May

14.3 10.6 6 29.1 12 78.9%

June

17.7 13.2 9.2 37.1 8 79.7%

July

18.3 14.9 11.4 51.7 16 81%

August

18 14.7 11.6 125.5 18 83.1%

September

16.9 13.4 9.7 68.6 14 82.3%

October

14.7 10.8 7.4 126.7 0 82.7%

November

11.3 7.8 4.1 143.7 19 84.5%

December

8.6 5.7 2.5 158.9 17 85.1%

Max.

Temperature

°F

ø.

Temperature

°F

Min.

Temperature

(°F)

Precip.

(in)

Rainy Days

(d)

Rel. Humidity

(%)

January

45.5 41 35.6 5.2 17 84.9%

February

45.3 40.6 35.8 3.6 13 82.8%

March

48.9 42.3 34.3 1.1 9 81.6%

April

54.5 46 38.3 2.1 6 79.2%

May

57.7 51.1 42.8 1.1 12 78.9%

June

63.9 55.8 48.6 1.5 8 79.7%

July

64.9 58.8 52.5 2 16 81%

August

64.4 58.5 52.9 4.9 18 83.1%

September

62.4 56.1 49.5 2.7 14 82.3%

October

58.5 51.4 45.3 5 0 82.7%

November

52.3 46 39.4 5.7 19 84.5%

December

47.5 42.3 36.5 6.3 17 85.1%
March is the driest at 1.1in / 27.4mm and December the wettest month with 6.3in / 158.9mm. With an average temperature of 58.8°F / 14.9°C, July is the warmest month in a year. February is the coldest with 40.6°F / 4.8°C average temperature.

Activities & POI in Caernarfon

Type of Activity List
Marina for Sailing, Boat adventures, fishing Caernarfon Marina
Attraction Castell Caernarfon
Caravan Site Coed Helen Caravan Park
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