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

°C

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

°F

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

7-day weather forecast
+9-day forecast

7-day weather forecast

Date	Weather	Max. F Min. F	Max. C Min. C	Windspeed Windir.	Precip. Rainrisk	Rel. Humidity
Nov. 03	Heavy rain	58 °F 54°F	14 °C 12°C	8mph (13km/h) south-southwest	1in (26mm) 95 %	89%
Nov. 04	Heavy rain	58 °F 56°F	14 °C 13°C	7mph (11km/h) south	1in (26mm) 95 %	88%
Nov. 05	Light shower rain	61 °F 57°F	16 °C 14°C	2mph (3km/h) south-southeast	0in (4mm) 65 %	86%
Nov. 06	Heavy rain	54 °F 48°F	12 °C 9°C	4mph (7km/h) south-southwest	1in (25mm) 95 %	89%
Nov. 07	Heavy rain	55 °F 48°F	13 °C 9°C	6mph (9km/h) south	1in (29mm) 95 %	91%
Nov. 08	Light shower rain	53 °F 51°F	12 °C 10°C	5mph (8km/h) west-southwest	0in (2mm) 55 %	84%
Nov. 09	Broken clouds	55 °F 51°F	13 °C 11°C	2mph (4km/h) south-southwest	0in (0mm) 10 %	88%

+9-day forecast

Date	Weather	Max. F Min. F	Max. C Min. C	Windspeed Windir.	Precip. Rainrisk	Rel. Humidity
Nov. 10	Light shower rain	53 °F 48°F	11 °C 9°C	2mph (4km/h) south	0in (2mm) 50 %	85%
Nov. 11	Light shower rain	50 °F 47°F	10 °C 8°C	3mph (5km/h) east-southeast	0in (2mm) 50 %	83%
Nov. 12	Moderate rain	50 °F 49°F	10 °C 10°C	7mph (11km/h) east-northeast	0in (13mm) 85 %	93%
Nov. 13	Light shower rain	48 °F 44°F	9 °C 6°C	8mph (13km/h) north-northeast	0in (5mm) 70 %	69%
Nov. 14	Light rain	48 °F 45°F	9 °C 7°C	6mph (9km/h) north-northeast	0in (8mm) 80 %	79%
Nov. 15	Light shower rain	49 °F 45°F	10 °C 7°C	2mph (3km/h) east-northeast	0in (2mm) 50 %	82%
Nov. 16	Broken clouds	51 °F 45°F	11 °C 7°C	3mph (5km/h) east	0in (1mm) 40 %	81%
Nov. 17	Scattered clouds	51 °F 47°F	10 °C 8°C	3mph (5km/h) east-northeast	0in (0mm) 0 %	83%
Nov. 18	Light shower rain	51 °F 46°F	10 °C 8°C	3mph (5km/h) east	0in (5mm) 70 %	92%

Caernarfon weather by month / climate table

°C

	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%

°F

	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

Irish Sea