Portsmouth Water Temperature

Portsmouth is a town close to Gulf of Maine. August is the month with the warmest water temperature at 64.2°F / 17.9°C. The coolest month is March with an avg. water temperature of 37.8°F / 3.2°C. October is the sunniest at 0in / 0mm and January the wettest month with 1.1in / 28.2mm. The average air temperature is around 71.4°F / 21.9°C, July is the hottest month in a year. January is the coolest with 25.2°F / -3.8°C average air temperature. Warm-summer humid continental climate would be the climate here. June, July, August, September would be the best time to visit.

Portsmouth Summary

Description	Value
Current water temperature	/
Warmest Month Water Temperature:	August with 64.2°F / 17.9°C
Coldest Month Water Temperature:	March with 37.8°F / 3.2°C
Warmest Month Air Temperature:	July with 71.4°F / 21.9°C
Coldest Month Air Temperature:	January with 25.2°F / -3.8°C
Wettest Month:	January with 1.1in / 28.2mm
Driest Month:	October with 0in / 0mm
Highest Humidity	August with 75.4%
Lowest Humidity	February with 66.3%
Best Time to Visit:	June, July, August, September
Climate Classification	Warm-summer humid continental climate

Portsmouth water temperature by month

°F

Gulf of Maine water temperature by month

	Max. Water Temperature (°F)	ø. Water Temperature (°F)	Min. Water Temperature (°F)
January	43.2	41.4	39.6
February	39.6	38.7	37.9
March	38.8	37.9	37.6
April	44.2	41.2	38.8
May	51.8	47.7	44.4
June	59.4	55.4	51.8
July	64.2	62.1	58.6
August	64.8	64	62.6
September	63.1	60.6	58.1
October	57.9	54.5	51.1
November	51.1	49.1	47.1
December	47.1	45.1	43.2

°C

Gulf of Maine water temperature by month

	Max. Water Temperature (°C)	ø. Water Temperature (°C)	Min. Water Temperature (°C)
January	6.2	5.2	4.2
February	4.2	3.7	3.3
March	3.8	3.3	3.1
April	6.8	5.1	3.8
May	11	8.7	6.9
June	15.2	13	11
July	17.9	16.7	14.8
August	18.2	17.8	17
September	17.3	15.9	14.5
October	14.4	12.5	10.6
November	10.6	9.5	8.4
December	8.4	7.3	6.2

The warmest water temperature are in August with around 64.2°F / 17.9°C. The coldest in March with an average water temperature of 37.8°F / 3.2°C.

Portsmouth weather by month / climate table

°F

	Max. Temperature °F	ø. Temperature °F	Min. Temperature (°F)	Precip. (in)	Rainy Days (d)	Rel. Humidity (%)
January	37.4	25.2	13.5	1.1	1	67.8%
February	37.8	27.1	15.6	0.8	0	66.3%
March	47.5	34	21.7	0.3	0	67.4%
April	58.8	45	32.7	0.6	4	66.6%
May	71.2	55	42.8	0.5	1	72.3%
June	78.4	64.4	53.4	0.6	1	75.2%
July	81.1	71.4	63.5	0.2	2	74.1%
August	79.9	70.3	61.5	0.2	0	75.4%
September	75.9	64.2	54.7	0.2	1	75.2%
October	64.4	52.3	40.6	0	0	73.1%
November	57	42.1	31.8	0	0	71.3%
December	43.7	32.5	23.4	0.2	0	69.5%

°C

	Max. Temperature °C	ø. Temperature °C	Min. Temperature (°C)	Precip. (mm)	Rainy Days (d)	Rel. Humidity (%)
January	3	-3.8	-10.3	28.2	1	67.8%
February	3.2	-2.7	-9.1	20.5	0	66.3%
March	8.6	1.1	-5.7	6.5	0	67.4%
April	14.9	7.2	0.4	14.9	4	66.6%
May	21.8	12.8	6	11.9	1	72.3%
June	25.8	18	11.9	16.3	1	75.2%
July	27.3	21.9	17.5	4.7	2	74.1%
August	26.6	21.3	16.4	4.6	0	75.4%
September	24.4	17.9	12.6	5.7	1	75.2%
October	18	11.3	4.8	0	0	73.1%
November	13.9	5.6	-0.1	0	0	71.3%
December	6.5	0.3	-4.8	5.5	0	69.5%

October is the most draught at 0in / 0mm and January the month with the most rain around 1.1in / 28.2mm. The avg. temperature is around 71.4°F / 21.9°C, July is the hottest month in a year. January is the coolest with 25.2°F / -3.8°C avg. temperature.

Activities & POI in Portsmouth

Type of Activity	List
Attraction	Wentworth-Coolidge Historic Site

Gulf of Maine