Best time to visit Plymouth
The best time to visit Plymouth is June and August–September, judged on twenty years of weather records and the events worth going for.
Plymouth, Massachusetts, United States
°C
mm
- Average daily high and low
- Precipitation
- Good month
- Best month
- Made good or best by an event
| Month | Average daily high | Average daily low | Precipitation | Verdict |
|---|---|---|---|---|
| January | 3.3 °C / 38 °F | -2.7 °C / 27 °F | 109 mm / 4.3 in | neither best nor good |
| February | 3.9 °C / 39 °F | -2.7 °C / 27 °F | 98 mm / 3.9 in | neither best nor good |
| March | 7 °C / 45 °F | 0.7 °C / 33 °F | 114 mm / 4.5 in | neither best nor good |
| April | 11.6 °C / 53 °F | 5.5 °C / 42 °F | 103 mm / 4.1 in | neither best nor good |
| May | 16.9 °C / 62 °F | 10.7 °C / 51 °F | 89 mm / 3.5 in | good month |
| June | 21.7 °C / 71 °F | 15.6 °C / 60 °F | 93 mm / 3.7 in | best month |
| July | 25.5 °C / 78 °F | 19.5 °C / 67 °F | 87 mm / 3.4 in | good month |
| August | 24.8 °C / 77 °F | 18.8 °C / 66 °F | 80 mm / 3.1 in | best month |
| September | 21.4 °C / 71 °F | 15.6 °C / 60 °F | 95 mm / 3.8 in | best month |
| October | 16.4 °C / 62 °F | 10.4 °C / 51 °F | 116 mm / 4.6 in | good month |
| November | 10.8 °C / 51 °F | 4.7 °C / 40 °F | 96 mm / 3.8 in | neither best nor good |
| December | 6.2 °C / 43 °F | 0.3 °C / 33 °F | 127 mm / 5 in | neither best nor good |
Good and best months depend on more than temperature, rain and events. How they are chosen
Each activity on this page has its own good and best months, rated on twenty years of daily weather records. Which measures count, and how much, depends on the activity: humidity for exploring outdoors, wind for the beach, hiking and skiing, snow for skiing alone. Between them, the activities are rated on:
- Daytime highs
- Night-time lows
- How warm it feels
- Humidity
- How much of the day is sunny
- Hours of daylight
- Monthly rainfall
- How many days it rains
- Days of heavy rain
- Wind
- Snowfall and days with snow
- Major events, such as festivals
The chart shows the good and best months for exploring outdoors.
The event icon marks a month that an event lifts to good or best, such as a festival or a natural spectacle. Choose “Weather only” in the toolbar to rate the months on weather alone.
Best months by activity
Exploring outdoors
Mild days and nights, mostly dry and bright. The default for 'when should I go'.
- JJanuary: neither
- FFebruary: neither
- MMarch: neither
- AApril: neither
- MMay: good
- JJune: best
- JJuly: good
- AAugust: best
- SSeptember: best
- OOctober: good
- NNovember: neither
- DDecember: neither
- Best
- June, August–September
- Good
- May, July, October
Why these months
May · good
In its favour: feels like (high) 15.8 °C / 60 °F, share of daylight that is sunny 70%, average daily high 16.9 °C / 62 °F, precipitation 89 mm / 3.5 in, days with heavy rain 2.9 days, average daily low 10.7 °C / 51 °F, wet days 10.8 days, relative humidity 74%.
June · best
In its favour: feels like (high) 22.6 °C / 73 °F, average daily high 21.7 °C / 71 °F, share of daylight that is sunny 73%, precipitation 93 mm / 3.7 in, days with heavy rain 2.9 days, wet days 9.6 days, average daily low 15.6 °C / 60 °F.
Against: relative humidity 77%.
July · good
In its favour: feels like (high) 27.9 °C / 82 °F, average daily high 25.5 °C / 78 °F, share of daylight that is sunny 79%, precipitation 87 mm / 3.4 in, days with heavy rain 2.3 days, wet days 10.1 days, average daily low 19.5 °C / 67 °F.
Against: relative humidity 78%.
August · best
In its favour: feels like (high) 26.7 °C / 80 °F, average daily high 24.8 °C / 77 °F, share of daylight that is sunny 81%, precipitation 80 mm / 3.1 in, days with heavy rain 2.5 days, wet days 9.2 days, average daily low 18.8 °C / 66 °F.
Against: relative humidity 77%.
September · best
In its favour: feels like (high) 21.6 °C / 71 °F, average daily high 21.4 °C / 71 °F, share of daylight that is sunny 75%, precipitation 95 mm / 3.8 in, wet days 8.2 days, average daily low 15.6 °C / 60 °F, days with heavy rain 3.5 days.
Against: relative humidity 77%.
October · good
In its favour: share of daylight that is sunny 71%, feels like (high) 14.3 °C / 58 °F, average daily high 16.4 °C / 62 °F, precipitation 116 mm / 4.6 in, wet days 10 days, average daily low 10.4 °C / 51 °F, days with heavy rain 3.8 days, relative humidity 74%.
Beach and swimming
Hot, dry and sunny. Penalises the monsoon hard.
- JJanuary: neither
- FFebruary: neither
- MMarch: neither
- AApril: neither
- MMay: neither
- JJune: neither
- JJuly: good
- AAugust: good
- SSeptember: neither
- OOctober: neither
- NNovember: neither
- DDecember: neither
- Good
- July–August
Why these months
July · good
In its favour: average daily high 25.5 °C / 78 °F, share of daylight that is sunny 79%, feels like (high) 27.9 °C / 82 °F, precipitation 87 mm / 3.4 in, days with heavy rain 2.3 days, average daily low 19.5 °C / 67 °F, wind (daily max) 19 km/h / 12 mph.
Against: wet days 10.1 days.
August · good
In its favour: share of daylight that is sunny 81%, average daily high 24.8 °C / 77 °F, feels like (high) 26.7 °C / 80 °F, precipitation 80 mm / 3.1 in, days with heavy rain 2.5 days, average daily low 18.8 °C / 66 °F, wind (daily max) 19 km/h / 11 mph.
Against: wet days 9.2 days.
Hiking and trekking
Cool enough to climb in, dry enough to enjoy, long enough days.
- JJanuary: neither
- FFebruary: neither
- MMarch: neither
- AApril: good
- MMay: best
- JJune: best
- JJuly: neither
- AAugust: good
- SSeptember: best
- OOctober: best
- NNovember: good
- DDecember: neither
- Best
- May–June, September–October
- Good
- April, August, November
Why these months
April · good
In its favour: average daily high 11.6 °C / 53 °F, precipitation 103 mm / 4.1 in, average daily low 5.5 °C / 42 °F, share of daylight that is sunny 69%, daylight per day 13.4 h, wet days 11.4 days, feels like (high) 8.7 °C / 48 °F, days with heavy rain 3.9 days, wind (daily max) 25 km/h / 15 mph.
May · best
In its favour: average daily high 16.9 °C / 62 °F, precipitation 89 mm / 3.5 in, feels like (high) 15.8 °C / 60 °F, average daily low 10.7 °C / 51 °F, share of daylight that is sunny 70%, daylight per day 14.6 h, days with heavy rain 2.9 days, wet days 10.8 days, wind (daily max) 22 km/h / 13 mph.
June · best
In its favour: average daily high 21.7 °C / 71 °F, precipitation 93 mm / 3.7 in, wet days 9.6 days, share of daylight that is sunny 73%, daylight per day 15.2 h, feels like (high) 22.6 °C / 73 °F, days with heavy rain 2.9 days, average daily low 15.6 °C / 60 °F, wind (daily max) 20 km/h / 12 mph.
August · good
In its favour: precipitation 80 mm / 3.1 in, average daily high 24.8 °C / 77 °F, wet days 9.2 days, share of daylight that is sunny 81%, daylight per day 13.8 h, days with heavy rain 2.5 days, wind (daily max) 19 km/h / 11 mph.
Against: average daily low 18.8 °C / 66 °F, feels like (high) 26.7 °C / 80 °F.
September · best
In its favour: average daily high 21.4 °C / 71 °F, precipitation 95 mm / 3.8 in, wet days 8.2 days, feels like (high) 21.6 °C / 71 °F, share of daylight that is sunny 75%, daylight per day 12.5 h, days with heavy rain 3.5 days, average daily low 15.6 °C / 60 °F, wind (daily max) 20 km/h / 13 mph.
October · best
In its favour: average daily high 16.4 °C / 62 °F, precipitation 116 mm / 4.6 in, feels like (high) 14.3 °C / 58 °F, average daily low 10.4 °C / 51 °F, share of daylight that is sunny 71%, wet days 10 days, daylight per day 11.1 h, days with heavy rain 3.8 days, wind (daily max) 24 km/h / 15 mph.
November · good
In its favour: average daily high 10.8 °C / 51 °F, precipitation 96 mm / 3.8 in, wet days 9.1 days, average daily low 4.7 °C / 40 °F, share of daylight that is sunny 67%, days with heavy rain 3.1 days, feels like (high) 7.2 °C / 45 °F, wind (daily max) 25 km/h / 16 mph.
Against: daylight per day 9.8 h.
An activity is listed only where it applies: skiing at ski destinations, beach and swimming at beach destinations. The nearest ski area is Gunstock Recreation Area, 183 km away.
Weather averages
Monthly averages over twenty years, 2006–2025. Highs, lows and precipitation are in the chart at the top.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels like (high) | -1.6 °C | -0.9 °C | 2.6 °C | 8.7 °C | 15.8 °C | 22.6 °C | 27.9 °C | 26.7 °C | 21.6 °C | 14.3 °C | 7.2 °C | 1.8 °C |
| Days with heavy rain | 3.5 days | 3.6 days | 3.5 days | 3.9 days | 2.9 days | 2.9 days | 2.3 days | 2.5 days | 3.5 days | 3.8 days | 3.1 days | 4.7 days |
| Time rain usually falls | 7 am | 4 pm | 5 am | 5 am | 6 am | 4 pm | 5 pm | 5 pm | 2 am | 3 am | 7 pm | 3 am |
| Sunshine per day | 6.5 h | 7.2 h | 8.4 h | 9.2 h | 10.2 h | 11.2 h | 11.7 h | 11.2 h | 9.3 h | 7.9 h | 6.6 h | 5.7 h |
| Relative humidity | 67% | 66% | 65% | 68% | 74% | 77% | 78% | 77% | 77% | 74% | 69% | 70% |
Sea temperature
Averaged over a shorter period (2022–2025) than the twenty-year averages above.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature 2022–2025 | 5.2 °C | 3.7 °C | 4.4 °C | 6.9 °C | 11.4 °C | 16.1 °C | 17.8 °C | 18.6 °C | 18.7 °C | 15.5 °C | 11.3 °C | 7.7 °C |
| Sea temperature (daily max) 2022–2025 | 5.3 °C | 3.8 °C | 4.5 °C | 7.2 °C | 11.9 °C | 16.6 °C | 18.6 °C | 19.1 °C | 19 °C | 15.7 °C | 11.4 °C | 7.8 °C |
- Very cold 10 °C or less
- Cold 10 to 15 °C
- Cool 15 to 20 °C
- Comfortable 20 to 25 °C
- Warm 25 to 28 °C
- Very warm over 28 °C
The words describe how the water feels to swim in. They are ours, not an official standard.
Air quality
Averaged over a shorter period (2022–2025) than the twenty-year averages above, and not counted towards good or best months.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Air pollution (PM2.5) 2022–2025 | 7.5 µg/m³ | 8.5 µg/m³ | 7.5 µg/m³ | 7.8 µg/m³ | 8.2 µg/m³ | 11.9 µg/m³ | 10.3 µg/m³ | 9.7 µg/m³ | 8.3 µg/m³ | 7.1 µg/m³ | 6.2 µg/m³ | 6.8 µg/m³ |
| Air pollution (PM2.5, daily peak) 2022–2025 | 13.7 µg/m³ | 15.8 µg/m³ | 14 µg/m³ | 13.2 µg/m³ | 14.1 µg/m³ | 20.4 µg/m³ | 16.8 µg/m³ | 15.8 µg/m³ | 13.3 µg/m³ | 11.8 µg/m³ | 11.7 µg/m³ | 12.8 µg/m³ |
- Good 15 µg/m³ or less
- Fair 15 to 25 µg/m³
- Moderate 25 to 37.5 µg/m³
- Poor 37.5 to 50 µg/m³
- Very poor 50 to 75 µg/m³
- Extremely poor over 75 µg/m³
Each figure is compared with the World Health Organization's guideline for a day's air, 15 µg/m³ or less, and with its interim targets above that. The words are ours: the WHO does not name its steps. The figures are modelled monthly averages, so single days can be well above them. The daily peak is the average of each day's highest hour, shaded on the same scale.