Climate and monthly weather forecastPort Royal, Jamaica
Climate and monthly weather forecast
The climate of Port Royal
Situated in the Caribbean, Port Royal, Jamaica is known for a tropical wet and dry climate, as classified by the Köppen system. This climate characterizes most of Jamaica and is considered quite pleasant by visitors due to its warm tropical ambiance.Throughout the year, the temperature remains fairly consistent with minor fluctuations between high and low values. The highest temperature, reaching up to 30.3°C (86.5°F), is observed in July, while the temperature dips to its lowest value of 21.6°C (70.9°F) in February. Sea temperature from 27.1°C (80.8°F) to 29.5°C (85.1°F) also contributes to the overall tropical atmosphere.
Port Royal experiences a significant amount of precipitation throughout the year, with the maximum rainfall of 184mm (7.24") observed in October. Even during the "dry" months, the region still records rainfall, the lowest of which is 44mm (1.73") in February.
Consequently, relative humidity ranges from 78% to 82%, reflective of the considerable rainfall. Despite the tropical rains, there is a generous amount of sunshine with an average of 8.58 hours per day and daylight varying slightly from 11.1 hours to 13.2 hours.
The best time to visit Port Royal
The best time to visit Port Royal primarily depends on visitor preferences. However, taking the overall climate into account, the months from January to April offer a milder climate with relative temperatures ranging from 27.3°C (81.1°F) to 28.7°C (83.7°F) and lower precipitation levels, making them the most favored months for vacation planning. Additionally, these months have longer daylight hours ranging from 11.2 to 12.6 hours, allowing tourists to make the most of their day.The worst time to visit Port Royal
On the flip side, the period from September to October marks the peak of the rainy season in Port Royal. With rainfall levels well above 150mm (5.91"), accompanied by high relative humidity of 82%, this time may not be the most comfortable for visitors, limiting outdoor activities. Furthermore, average temperatures rise to around 30°C (86°F), which some may find too hot.Spring weather in Port Royal
In Port Royal, spring months (March to May) are characterized by an increment in both temperature and rainfall. While the temperatures progressively escalate from 27.7°C (81.9°F) to 29.3°C (84.7°F), the rainfall amounts gradually rise from 59mm (2.32") to 154mm (6.06"). During this period, daylight hours are extensive varying from 12.1 to 13 hours maximizing outdoor enjoyments.Summer weather in Port Royal
The summer months (June to August) in Port Royal are the warmest with temperatures peaking at 30.3°C (86.5°F) in July. Rainfall is noticeable but less compared to autumn, measuring from 122mm (4.8") to 131mm (5.16"). These months also offer the longest daylight hours in the year from 13.2 to 12.7 hours.Autumn weather in Port Royal
Autumn (September to November) is the wettest season in Port Royal, with rainfall significantly increasing from 154mm (6.06") to 184mm (7.24"). The temperature during these months remains consistently around 29°C (84.2°F). Cloud coverage increases, however, daylight still lasts from 12.2 hours to 11.3 hours.Winter weather in Port Royal
The winter months (December to February) in Port Royal are relatively dry as compared to other seasons with rainfall as low as 76mm (2.99") in December. The temperatures remain mild, ranging from 27.8°C (82°F) to 27.3°C (81.1°F). This time offers moderate daylight hours from 11.3 to 11.6 hours.Weather in January
January in Port Royal, Jamaica kickstarts the year with steady weather conditions characterized by moderate rainfall and constant temperatures. Despite it being one of the cooler months, temperatures remain pleasantly warm, practically falling in line with the season's tropical climate. Weather in January »Weather in February
The transition from January to February sees a slight decrease in rainfall and temperature. Wind conditions remain stable and similar to January, providing refreshing breezes throughout the city. In this month, the weather is relatively dry with rainfall dropping to 44mm (1.73"). Weather in February »Weather in March
As Port Royal transitions into March, there is a slight increase in temperature as well as in the duration of daily sunshine, indicating the approaching summer season. March welcomes an uptick in rainfall, marking one of the highest spikes for the year at 59mm (2.32"). Weather in March »Weather in April
The Port Royal weather turns decidedly warmer in April with the highest temperature rising to 28.7°C (83.7°F), a notable difference from the cooler opening months. Along with this temperature upswing, the rainfall also increases substantially with a notable jump to 78mm (3.07"), indicating a considerably wetter month. Weather in April »Weather in May
May in Port Royal brings an appreciable change in the weather pattern with the commencement of the wet season. The precipitation reaches its first peak at 154mm (6.06"), signaling a departure from the dryer months. Nonetheless, the sea remains warm with temperatures persistently staying well above average. Weather in May »Weather in June
June welcomes the summer season in Port Royal with temperature highs reaching 30°C (86°F), making it one of the hottest times of the year. Sea temperatures remain congenial and comforting despite the increase in the heat. Wind speeds also show an uptick, reaching 12.8km/h (8mph), complementing the tropical summer atmosphere. Weather in June »Weather in July
July weather remains strikingly similar to June in most respects including temperature, rainfall, and wind speed. The City of Port Royal in July experiences the highest temperature of the year, peaking at 30.3°C (86.5°F). Simultaneously, the constant sea temperature keeps the coastal areas comfortably balmy. Weather in July »Weather in August
August in Port Royal, Jamaica marks the continued persistence of high temperatures, abundant rainfall, and sea warmth. Even though the overall temperature drops slightly, the city continues to encounter defined summer hits. The weather consistently exhibits a high of 30.1°C (86.2°F), teamed with a sustaining rainfall of 131mm (5.16"). Weather in August »Weather in September
Moving into the month of September, Port Royal experiences a minute decline in the temperature levels, whereas the rainfall touches its zenith at 154mm (6.06"). The number of rainfall days also amplifies, totalling the highest for the year at 27.1 days. Weather in September »Weather in October
October brings a marked shift in weather patterns for Port Royal with rainfall beginning to recede but remaining substantial at 184mm (7.24"). Simultaneously, the temperatures also display a soft downward trend, paving the way for the impending cooler months. Weather in October »Weather in November
The month of November witnesses a significant drop in rainfall, amounting to 112mm (4.41"). Wind gusts also dip slightly, leading to more peaceful daylight hours in Port Royal. However, November is not devoid of the tropical edge as the temperature and humidity continue in their higher range. Weather in November »Weather in December
December culminates the year in Port Royal, making a noteworthy transition into drier and cooler conditions. The weather takes a cooler turn with the lowest average temperature of 22.4°C (72.3°F). Rainfall rates fall to an annual low of 76mm (2.99"), indicating the onset of the drier months. Weather in December »Updated: Jan 31, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
The months of January and February are noted for their lowest temperatures in Port Royal, with an average high-temperature of 27.3°C (81.1°F).
In Port Royal, during the entire year, the rain falls for 310.9 days and collects up to 1286mm (50.63") of precipitation.
January through May, November and December, with an average maximum UV index of 6, are months with the lowest UV index.
The month with the least rainfall in Port Royal is February, when the rain falls for 22.1 days and typically collects 44mm (1.73") of precipitation.
With an average sea temperature of 26.9°C (80.4°F), February is the month with the coldest seawater in Port Royal.
With an average relative humidity of 78%, March is the least humid month in Port Royal, Jamaica.
With an average of 13h and 12min of daylight, June has the longest days of the year.
June through October, with an average maximum UV index of 7, are months with the highest UV index in Port Royal.
August brings the highest temperatures in Port Royal, Jamaica, with an average high of 30.3°C (86.5°F) and an average low of 24.2°C (75.6°F).
The months with the most sunshine in Port Royal are August and September, with an average of 10.8h of sunshine.
September is the month with the warmest seawater in Port Royal, with an average sea temperature of 29.5°C (85.1°F).
October is the most humid month in Port Royal, with an average relative humidity of 82%.
The month with the most rainfall is October, when the rain falls for 28.7 days and typically aggregates up to 184mm (7.24") of precipitation.
With an average of 11h and 6min of daylight, December has the shortest days of the year in Port Royal.
Port Royal does not observe Daylight Saving Time (DST). EST timezone is used over the entire year.
December has the least sunshine of the year in Port Royal, Jamaica, with an average of 6.5h of sunshine.
Average temperature
Port Royal, Jamaica
The warmest month (with the highest average high temperature) is August (30.3°C).
The months with the lowest average high temperature are January and February (27.3°C).
The month with the highest average low temperature is July (24.3°C).
The coldest month (with the lowest average low temperature) is February (21.6°C).
Average pressure
Port Royal, Jamaica
- Average pressure in January:
1015.5mbar - Average pressure in February:
1015.4mbar - Average pressure in March:
1015.2mbar - Average pressure in April:
1014.2mbar - Average pressure in May:
1013.6mbar - Average pressure in June:
1014.1mbar
- Average pressure in July:
1014.6mbar - Average pressure in August:
1013.4mbar - Average pressure in September:
1012.3mbar - Average pressure in October:
1011.5mbar - Average pressure in November:
1012.4mbar - Average pressure in December:
1014.4mbar
The month with the highest atmospheric pressure is January (1015.5mbar).
The month with the lowest atmospheric pressure is October (1011.5mbar).
Average wind speed
Port Royal, Jamaica
- Average wind speed in January:
10.5km/h - Average wind speed in February:
10.3km/h - Average wind speed in March:
9.7km/h - Average wind speed in April:
9.8km/h - Average wind speed in May:
10.8km/h - Average wind speed in June:
12.8km/h
- Average wind speed in July:
12.1km/h - Average wind speed in August:
10.8km/h - Average wind speed in September:
8.9km/h - Average wind speed in October:
8.8km/h - Average wind speed in November:
8.6km/h - Average wind speed in December:
10km/h
The windiest month (with the highest average wind speed) is June (12.8km/h).
The calmest month (with the lowest average wind speed) is November (8.6km/h).
Average humidity
Port Royal, Jamaica
The month with the highest relative humidity is October (82%).
The month with the lowest relative humidity is March (78%).
Average rainfall
Port Royal, Jamaica
- Average rainfall in January:
52mm - Average rainfall in February:
44mm - Average rainfall in March:
59mm - Average rainfall in April:
78mm - Average rainfall in May:
154mm - Average rainfall in June:
122mm
- Average rainfall in July:
120mm - Average rainfall in August:
131mm - Average rainfall in September:
154mm - Average rainfall in October:
184mm - Average rainfall in November:
112mm - Average rainfall in December:
76mm
The wettest month (with the highest rainfall) is October (184mm).
The driest month (with the least rainfall) is February (44mm).
Average rainfall days
Port Royal, Jamaica
- Average rainfall days in January:
23.9 days - Average rainfall days in February:
22.1 days - Average rainfall days in March:
25.4 days - Average rainfall days in April:
24.4 days - Average rainfall days in May:
27.5 days - Average rainfall days in June:
26.1 days
- Average rainfall days in July:
26.2 days - Average rainfall days in August:
27.8 days - Average rainfall days in September:
27.1 days - Average rainfall days in October:
28.7 days - Average rainfall days in November:
26 days - Average rainfall days in December:
25.7 days
The month with the highest number of rainy days is October (28.7 days).
The month with the least rainy days is February (22.1 days).
Average sea temperature
Port Royal, Jamaica
The best month for swimming (with the highest average sea temperature) is September (29.5°C).
The coldest month (with the lowest average sea temperature) is February (26.9°C).
Average daylight / Average sunshine
Port Royal, Jamaica
- Average daylight in January:
11h and 12min - Average daylight in February:
11h and 36min - Average daylight in March:
12h and 6min - Average daylight in April:
12h and 36min - Average daylight in May:
13h and 0min - Average daylight in June:
13h and 12min
- Average daylight in July:
13h and 6min - Average daylight in August:
12h and 42min - Average daylight in September:
12h and 12min - Average daylight in October:
11h and 42min - Average daylight in November:
11h and 18min - Average daylight in December:
11h and 6min
The month with the longest days is June (Average daylight: 13h and 12min).
The month with the shortest days is December (Average daylight: 11h and 6min).
- Average sunshine in January:
6h and 48min - Average sunshine in February:
8h and 30min - Average sunshine in March:
8h and 36min - Average sunshine in April:
10h and 18min - Average sunshine in May:
10h and 6min - Average sunshine in June:
9h and 42min
- Average sunshine in July:
10h and 36min - Average sunshine in August:
10h and 48min - Average sunshine in September:
10h and 48min - Average sunshine in October:
7h and 12min - Average sunshine in November:
6h and 36min - Average sunshine in December:
6h and 30min
The months with the most sunshine are August and September (Average sunshine: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 6h and 30min).
Average sunshine days
Port Royal, Jamaica
- Average sunshine days in January:
3.4 days - Average sunshine days in February:
3.1 days - Average sunshine days in March:
2.7 days - Average sunshine days in April:
2.4 days - Average sunshine days in May:
1.6 days - Average sunshine days in June:
1.1 days
- Average sunshine days in July:
1.1 days - Average sunshine days in August:
0.3 days - Average sunshine days in September:
0.8 days - Average sunshine days in October:
0.8 days - Average sunshine days in November:
1.7 days - Average sunshine days in December:
1.8 days
The month with the most sunshine days is January (3.4 days).
The month with the least sunshine days is August (0.3 days).
Average UV index
Port Royal, Jamaica
The months with the highest UV index are June, July, August, September and October (UV index 7).
The months with the lowest UV index are January, February, March, April, May, November and December (UV index 6).
Average cloud cover
Port Royal, Jamaica
The month with the most cloud cover is June (Cloud cover 41).
The month with the least cloud cover is September (Cloud cover 29).
Average visibility
Port Royal, Jamaica
The months with the highest visibility are January, February, March, April, June, July, November and December (10km).
The months with the lowest visibility are May, August, September and October (9km).
