Porthmadog Water Temperature

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Porthmadog is a town close to Irish Sea. August is the month with the hottest water temperature at 59.9°F / 15.5°C. The coldest month is March with an ø water temperature of 45.1°F / 7.3°C. March is the month with the lowest precipitation of 1.5in / 38.7mm and December with the highest precipitation in a year with 6.3in / 160.7mm. The avg. air 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. June, July, August, September would be the best time to visit. temperate oceanic climate with warm summer would be the climate here.

Porthmadog 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 4.2°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

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Porthmadog 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	7.9
February	7.9	7.6	7.3
March	7.6	7.3	7.1
April	9.1	8.3	7.6
May	11.2	10	9.1
June	13.4	12.3	11.2
July	15	14.3	13.4
August	15.8	15.5	15
September	15.8	15.5	15
October	15.1	14.3	13.3
November	13.3	12.2	11
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	46.2
February	46.2	45.7	45.1
March	45.7	45.1	44.8
April	48.4	46.9	45.7
May	52.2	50	48.4
June	56.1	54.1	52.2
July	59	57.7	56.1
August	60.4	59.9	59
September	60.4	59.9	59
October	59.2	57.7	55.9
November	55.9	54	51.8
December	51.8	50.2	48.6

August is the month with the highest water temperature at 59.9°F / 15.5°C. The month with the lowest is March with an average water temperature of 45.1°F / 7.3°C.

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Porthmadog 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
Dec. 22	Mix snow/rain	44 °F 40°F	7 °C 4°C	6mph (10km/h) west-northwest	0in (3mm) 60 %	71%
Dec. 23	Mix snow/rain	50 °F 41°F	10 °C 5°C	2mph (3km/h) southwest	0in (3mm) 60 %	83%
Dec. 24	Overcast clouds	52 °F 47°F	11 °C 8°C	1mph (2km/h) south-southwest	0in (0mm) 15 %	98%
Dec. 25	Overcast clouds	51 °F 49°F	10 °C 9°C	2mph (3km/h) southwest	0in (0mm) 15 %	93%
Dec. 26	Broken clouds	50 °F 42°F	10 °C 6°C	1mph (1km/h) east	0in (0mm) 20 %	93%
Dec. 27	Broken clouds	51 °F 40°F	11 °C 5°C	1mph (1km/h) east	0in (0mm) 0 %	92%
Dec. 28	Broken clouds	46 °F 42°F	8 °C 5°C	1mph (2km/h) south-southwest	0in (0mm) 20 %	94%

+9-day forecast

Date	Weather	Max. F Min. F	Max. C Min. C	Windspeed Windir.	Precip. Rainrisk	Rel. Humidity
Dec. 29	Broken clouds	44 °F 38°F	7 °C 3°C	1mph (2km/h) southwest	0in (0mm) 15 %	97%
Dec. 30	Mix snow/rain	43 °F 37°F	6 °C 3°C	3mph (5km/h) south-southwest	0in (8mm) 80 %	93%
Dec. 31	Mix snow/rain	36 °F 33°F	2 °C 1°C	7mph (11km/h) west	0in (6mm) 85 %	77%
Jan. 01	Mix snow/rain	37 °F 33°F	3 °C 1°C	4mph (6km/h) west-northwest	0in (1mm) 50 %	73%
Jan. 02	Overcast clouds	34 °F 32°F	1 °C 0°C	1mph (2km/h) east-northeast	0in (0mm) 20 %	80%
Jan. 03	Flurries	35 °F 32°F	2 °C -0°C	3mph (5km/h) east	0in (0mm) 20 %	82%
Jan. 04	Light rain	51 °F 35°F	11 °C 1°C	2mph (3km/h) east-southeast	0in (7mm) 75 %	96%
Jan. 05	Heavy rain	50 °F 45°F	10 °C 7°C	6mph (9km/h) south-southwest	1in (23mm) 90 %	98%
Jan. 06	Light rain	49 °F 43°F	9 °C 6°C	6mph (10km/h) southwest	0in (9mm) 80 %	92%

Porthmadog weather by month / climate table

°C

	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%

°F

	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%

March is the month with the lowest rain of 1.5in / 38.7mm and December with the highest precipitation in a year with 6.3in / 160.7mm. The 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 temperature.

Activities & POI in Porthmadog

Type of Activity	List
Marina for Sailing, Boat adventures, fishing	Porthmadoc Harbour
Golf Course	Putting green

Irish Sea