Portsmouth Water Temperature

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

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

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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.

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Portsmouth 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. 25	Few clouds	67 °F 39°F	19 °C 4°C	1mph (2km/h) south-southwest	0in (0mm) 0 %	76%
Nov. 26	Scattered clouds	66 °F 48°F	19 °C 9°C	2mph (3km/h) west	0in (2mm) 45 %	78%
Nov. 27	Broken clouds	59 °F 41°F	15 °C 5°C	1mph (2km/h) east-southeast	0in (0mm) 0 %	67%
Nov. 28	Moderate rain	65 °F 48°F	19 °C 9°C	3mph (4km/h) southwest	0in (12mm) 85 %	87%
Nov. 29	Light rain	53 °F 39°F	12 °C 4°C	2mph (4km/h) northwest	0in (8mm) 80 %	71%
Nov. 30	Few clouds	44 °F 31°F	7 °C -1°C	2mph (3km/h) west-northwest	0in (0mm) 0 %	59%
Dec. 01	Broken clouds	46 °F 34°F	8 °C 1°C	2mph (3km/h) west-northwest	0in (0mm) 10 %	58%

+9-day forecast

Date	Weather	Max. F Min. F	Max. C Min. C	Windspeed Windir.	Precip. Rainrisk	Rel. Humidity
Dec. 02	Few clouds	42 °F 32°F	6 °C 0°C	2mph (3km/h) west-northwest	0in (0mm) 0 %	56%
Dec. 03	Clear Sky	43 °F 32°F	6 °C -0°C	2mph (3km/h) west	0in (0mm) 0 %	56%
Dec. 04	Scattered clouds	47 °F 34°F	8 °C 1°C	2mph (4km/h) west-southwest	0in (0mm) 0 %	62%
Dec. 05	Broken clouds	52 °F 40°F	11 °C 4°C	2mph (4km/h) southwest	0in (0mm) 0 %	67%
Dec. 06	Broken clouds	43 °F 40°F	6 °C 4°C	3mph (5km/h) north-northwest	0in (0mm) 0 %	63%
Dec. 07	Few clouds	42 °F 36°F	5 °C 2°C	1mph (2km/h) west-northwest	0in (0mm) 0 %	67%
Dec. 08	Clear Sky	47 °F 37°F	8 °C 3°C	1mph (2km/h) south	0in (0mm) 0 %	69%
Dec. 09	Broken clouds	55 °F 41°F	13 °C 5°C	2mph (3km/h) south-southwest	0in (0mm) 0 %	75%
Dec. 10	Overcast clouds	50 °F 46°F	10 °C 8°C	3mph (4km/h) northwest	0in (0mm) 20 %	66%

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 driest at 0in / 0mm and January the wettest month with 1.1in / 28.2mm. With an average temperature of 71.4°F / 21.9°C, July is the warmest month in a year. January is the coldest with 25.2°F / -3.8°C average temperature.

Activities & POI in Portsmouth

Type of Activity	List
Attraction	Wentworth-Coolidge Historic Site

Gulf of Maine