Plymouth climate
Plymouth (Montserrat) has a tropical savanna (dry winter) climate (Köppen Aw). The average temperature over the year is 27 °C80 °F, and about 1,003 mm39 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Plymouth climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 2679 | 2578 | 2678 | 451.8 |
| Feb | 2679 | 2577 | 2578 | 291.1 |
| Mar | 2679 | 2577 | 2678 | 341.3 |
| Apr | 2780 | 2678 | 2679 | 542.1 |
| May | 2781 | 2680 | 2780 | 873.4 |
| Jun | 2882 | 2781 | 2882 | 773.0 |
| Jul | 2883 | 2781 | 2882 | 983.8 |
| Aug | 2883 | 2882 | 2883 | 1144.5 |
| Sep | 2984 | 2882 | 2883 | 1264.9 |
| Oct | 2883 | 2882 | 2882 | 1586.2 |
| Nov | 2882 | 2780 | 2781 | 1174.6 |
| Dec | 2780 | 2679 | 2680 | 642.5 |
| Year | 2984 | 2577 | 2780 | 1,00339 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 75% | 35% | 5.1 | 11:14 |
| Feb | 75% | 33% | 5.8 | 11:35 |
| Mar | 75% | 35% | 6.5 | 12:00 |
| Apr | 76% | 42% | 6.7 | 12:30 |
| May | 78% | 53% | 6.5 | 12:54 |
| Jun | 78% | 54% | 6.4 | 13:07 |
| Jul | 78% | 46% | 6.4 | 13:02 |
| Aug | 78% | 43% | 6.5 | 12:41 |
| Sep | 78% | 52% | 6.1 | 12:12 |
| Oct | 78% | 50% | 5.5 | 11:44 |
| Nov | 77% | 42% | 5.0 | 11:20 |
| Dec | 76% | 38% | 4.8 | 11:08 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Plymouth is like
The warmest month is September, with an average high of 29 °C84 °F and a low of 28 °C82 °F. The coldest is February, when highs average 26 °C79 °F and lows 25 °C77 °F. Temperatures barely change through the year: the warmest and the coolest month differ by only 2.8 °C5 °F.
It is wet, with about 1,003 mm39 in of precipitation per year. The wettest three-month stretch is September–November, which brings 40% of the annual total. The wettest month is October (158 mm6.2 in), the driest is February (29 mm1.1 in).
Relative humidity ranges from 75% in February to 78% in July. The clearest skies (lowest average cloud amount, 33%) are typical of February. Average wind speed near the ground ranges from 16 km/h (10 mph) in September to 22 km/h (14 mph) in July. Daylight lasts from about 11.1 hours in December to 13.1 hours in June.
Best time to visit Plymouth
Based on these averages, the most comfortable months for sightseeing and outdoor activities are December–June: average highs of 26 °C79 °F to 28 °C82 °F with 29 mm1.1 in to 87 mm3.4 in of precipitation per month.
The most challenging month is October, which is very wet (158 mm6.2 in) and humid (78% relative humidity).
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Plymouth
- Wetter months (May, July–November) — highs 2781 to 29 °C84 °F, lows 2680 to 28 °C82 °F, about 117 mm4.6 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an umbrella or light rain jacket.
- Drier months (December–April, June) — highs 2679 to 28 °C82 °F, lows 2577 to 27 °C81 °F, about 50 mm2.0 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses.
How Plymouth compares
Compared with Saint Johns, about 61 km to the northeast, Plymouth has practically the same average temperature and receives 10% less precipitation (1,003 mm39 in vs 1,108 mm44 in).
Places in other countries with the most similar temperature and rainfall pattern: Saint Johns (Antigua and Barbuda, Aw), Charlotte Amalie (U.S. Virgin Islands, Aw) and Basse-Terre (Guadeloupe, Aw).
Nearby places
- Saint Johns 61 km · 27 °C81 °F · 1,108 mm44 in
- Basseterre 85 km · 27 °C81 °F · 792 mm31 in
- Basse-Terre 94 km · 27 °C81 °F · 1,171 mm46 in
- Gustavia 149 km · 27 °C81 °F · 614 mm24 in
- Marigot 177 km · 27 °C81 °F · 614 mm24 in
- Roseau 179 km · 27 °C81 °F · 1,419 mm56 in
- Fort-de-France 264 km · 27 °C81 °F · 1,478 mm58 in
- Road Town 319 km · 27 °C81 °F · 646 mm25 in
Frequently asked questions
What is the warmest month in Plymouth?
September is the warmest month in Plymouth, with an average high of 29 °C (84 °F) and an average low of 28 °C (82 °F).
What is the coldest month in Plymouth?
February is the coldest month, with an average high of 26 °C (79 °F) and an average low of 25 °C (77 °F).
When does it rain the most in Plymouth?
October is the wettest month with about 158 mm (6.2 in) of precipitation; February is the driest with about 29 mm (1.1 in).
What is the best time to visit Plymouth?
Judging by long-term averages, the most comfortable months are December–June.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 0 m, while Plymouth lies at about 77 m. Temperatures on this page were therefore adjusted by −0.5 °C0.9 °F using the standard lapse rate of 6.5 °C per 1,000 m.