Measurements:
°C
°F
CURRENT WEATHER
11:13
Plymouth
66°F
SW 9 mph
Feels like: 66°F
Precip: 3%
World Resorts USA Plymouth Weather

7 Day Weather Forecast

09.15
tue
DAY
66°F
SW 9 mph
precip
3%
NIGHT
54°F
N 5 mph
precip
12%
09.16
wed
DAY
68°F
NE 8 mph
precip
16%
NIGHT
64°F
NE 6 mph
precip
14%
09.17
thu
DAY
82°F
NE 2 mph
precip
4%
NIGHT
68°F
NE 7 mph
precip
37%
09.18
fri
DAY
78°F
S 11 mph
precip
10%
NIGHT
60°F
SW 14 mph
precip
3%
09.19
sat
DAY
62°F
SW 7 mph
precip
11%
NIGHT
58°F
N 6 mph
precip
18%
09.20
sun
DAY
62°F
N 11 mph
precip
79%
NIGHT
58°F
S 14 mph
precip
33%
09.21
mon
DAY
64°F
SW 11 mph
precip
16%
NIGHT
56°F
W 6 mph
precip
16%

Plymouth Sea Water Temperature in September, °F

Select Year: 2026 2025 2024

The average sea surface temperature in September 2026 for Plymouth was 18.9°F. The maximum and minimum values were 18.0°F and 20.1°F respectively.

Plymouth on the Weather Map

Best Time to Visit Plymouth
The most sunny months:
November 15 days
December 13 days
June 13 days
The most warm months:
July 82.6 °F
August 81.1 °F
June 76.6 °F
Warmest sea temperature:
August 69.9 °F
July 69.4 °F
September 66.9 °F
The most cold months:
January 34.1 °F
February 35.3 °F
December 39.6 °F
The most rainy months:
October 4 days
April 3 days
July 2 days
The most windy months:
March 11 mph
January 11 mph
December 10 mph
more details