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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Climate and monthly weather forecast
Weather in January
January, like December, in Grantham, Jamaica, is another warm winter month, with an average temperature fluctuating between 20.5°C (68.9°F) and 28.4°C (83.1°F). Grantham witnesses the coldest weather in January, with temperatures averaging a high of 28.4°C (83.1°F) and a low of 20.5°C (68.9°F). In January, the heat index is computed to be a tropical 33°C (91.4°F). Weather in January »
Weather in February
February, the last month of the winter in Grantham, is another warm month, with temperature in the range of an average high of 28.8°C (83.8°F) and an average low of 20.6°C (69.1°F). As January transitions into February, Grantham records an average high-temperature of a still moderately hot 28.8°C (83.8°F), showing a gentle shift from the preceding month. Weather in February »
Weather in March
The first month of the spring, March, is still a warm month in Grantham, Jamaica, with an average temperature ranging between min 20.7°C (69.3°F) and max 29°C (84.2°F). As Grantham transitions from February to March, the average high-temperatures adjust to a still moderately hot 29°C (84.2°F), nearly the same as the previous 28.8°C (83.8°F). Weather in March »
Weather in April
April, the same as March, is a moderately hot spring month in Grantham, Jamaica, with an average temperature varying between 29.9°C (85.8°F) and 21.7°C (71.1°F). Upon the beginning of April, Grantham's high-temperatures register at a still moderately hot 29.9°C (85.8°F), closely mirroring the preceding month. Weather in April »
Weather in May
The last month of the spring, May, is a tropical month in Grantham, Jamaica, with an average temperature ranging between min 22.5°C (72.5°F) and max 30.3°C (86.5°F). Grantham's shift into May is marked by a subtle change to a hot 30.3°C (86.5°F) from April's 29.9°C (85.8°F) in temperature. Weather in May »
Weather in June
June, the first month of the summer in Grantham, is still a hot month, with an average temperature fluctuating between 23°C (73.4°F) and 30.8°C (87.4°F). Grantham's weather in June, with an average high-temperature of a still tropical 30.8°C (87.4°F), subtly shifts from May's 30.3°C (86.5°F). Weather in June »
Weather in July
July, like June, is another hot summer month in Grantham, Jamaica, with an average temperature ranging between min 23.5°C (74.3°F) and max 31.7°C (89.1°F). July and August are the warmest months, with an average high-temperature of 31.7°C (89.1°F). For most parts of July, the heat index is computed to be a scorching 42°C (107.6°F). Weather in July »
Weather in August
The last month of the summer, August, is also a hot month in Grantham, Jamaica, with an average temperature ranging between max 31.7°C (89.1°F) and min 23.8°C (74.8°F). During July and August, Grantham experiences its warmest period, with an average high-temperature of 31.7°C (89.1°F). Throughout August, the heat index is computed to be a scorching 42°C (107.6°F). Weather in August »
Weather in September
The first month of the autumn, September, is also a hot month in Grantham, Jamaica, with an average temperature ranging between min 23.3°C (73.9°F) and max 31.4°C (88.5°F). The beginning of September records an average high-temperature of a still hot 31.4°C (88.5°F), almost echoing the conditions of the previous month. Weather in September »
Weather in October
October, like September, is another hot autumn month in Grantham, Jamaica, with temperature in the range of an average low of 23.1°C (73.6°F) and an average high of 30.3°C (86.5°F). The advent of October denotes an average high-temperature of a still tropical 30.3°C (86.5°F), subtly different from September's 31.4°C (88.5°F). Weather in October »
Weather in November
The last month of the autumn, November, is another warm month in Grantham, Jamaica, with an average temperature ranging between min 22.5°C (72.5°F) and max 29.7°C (85.5°F). Grantham's November reports an average high-temperature of a moderately hot 29.7°C (85.5°F), exhibiting a minor difference from October. Weather in November »
Weather in December
The first month of the winter, December, is also a moderately hot month in Grantham, Jamaica, with an average temperature varying between 21.5°C (70.7°F) and 28.9°C (84°F). The advent of December denotes an average high-temperature of a still warm 28.9°C (84°F), subtly different from November's 29.7°C (85.5°F). 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
What are the coldest months in Grantham?
In Grantham, Jamaica, the average lowest temperatures are observed in January, with a high of 28.4°C (83.1°F) and a low of 20.5°C (68.9°F).
What is the driest month in Grantham?
The month with the least rainfall is January, when the rain falls for 19.4 days and typically collects 26mm (1.02") of precipitation.
How many days does it rain in Grantham?
In Grantham, Jamaica, during the entire year, the rain falls for 265.1 days and collects up to 806mm (31.73") of precipitation.
When is the lowest UV index in Grantham?
The months with the lowest UV index are January through April, September, November and December, with an average maximum UV index of 6.
What are the least humid months in Grantham?
March, July and August, with an average relative humidity of 77%, are the least humid months in Grantham, Jamaica.
What are the months with the highest UV index in Grantham?
The months with the highest UV index are May through August and October, with an average maximum UV index of 7.
When are the longest days in Grantham?
The month with the longest days is June, with an average of 13h and 12min of daylight.
What month is the hottest in Grantham?
Grantham sees the average highest temperatures during the months of July and August, peaking at 31.7°C (89.1°F).
What month has the most sunshine in Grantham?
With an average of 11h of sunshine, August has the most sunshine of the year in Grantham.
What are the most humid months in Grantham?
The months with the highest humidity in Grantham, Jamaica, are October through December, with an average relative humidity of 81%.
What is the rainiest month in Grantham?
October is the month with the most rainfall. Rain falls for 26.5 days and accumulates 123mm (4.84") of precipitation.
What is the month with the shortest days in Grantham?
December has the shortest days of the year in Grantham, with an average of 11h and 6min of daylight.
Is there Daylight Saving Time (DST) in Grantham?
Grantham does not utilize Daylight Saving Time (DST). EST timezone is used throughout the entire year.
What is the month with the least sunshine in Grantham?
The month with the least sunshine is December, with an average of 6.7h of sunshine.
Average temperature
Grantham, Jamaica
The warmest months (with the highest average high temperature) are July and August (31.7°C).
The month with the lowest average high temperature is January (28.4°C).
The month with the highest average low temperature is August (23.8°C).
The coldest month (with the lowest average low temperature) is January (20.5°C).
Average pressure
Grantham, 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
Grantham, Jamaica
- Average wind speed in January:
7.8km/h - Average wind speed in February:
7.6km/h - Average wind speed in March:
7.4km/h - Average wind speed in April:
7.3km/h - Average wind speed in May:
7.8km/h - Average wind speed in June:
9km/h
- Average wind speed in July:
8.8km/h - Average wind speed in August:
7.8km/h - Average wind speed in September:
6.8km/h - Average wind speed in October:
6.7km/h - Average wind speed in November:
6.6km/h - Average wind speed in December:
7.3km/h
The windiest month (with the highest average wind speed) is June (9km/h).
The calmest month (with the lowest average wind speed) is November (6.6km/h).
Average humidity
Grantham, Jamaica
The months with the highest relative humidity are October, November and December (81%).
The months with the lowest relative humidity are March, July and August (77%).
Average rainfall
Grantham, Jamaica
The wettest month (with the highest rainfall) is October (123mm).
The driest month (with the least rainfall) is January (26mm).
Average rainfall days
Grantham, Jamaica
- Average rainfall days in January:
19.4 days - Average rainfall days in February:
19.2 days - Average rainfall days in March:
20.7 days - Average rainfall days in April:
21.9 days - Average rainfall days in May:
25.4 days - Average rainfall days in June:
20.5 days
- Average rainfall days in July:
21.2 days - Average rainfall days in August:
24.9 days - Average rainfall days in September:
23.1 days - Average rainfall days in October:
26.5 days - Average rainfall days in November:
22.4 days - Average rainfall days in December:
19.9 days
The month with the highest number of rainy days is October (26.5 days).
The month with the least rainy days is February (19.2 days).
Average daylight / Average sunshine
Grantham, Jamaica
- Average daylight in January:
11h and 1min - Average daylight in February:
11h and 4min - Average daylight in March:
12h and 1min - Average daylight in April:
12h and 4min - Average daylight in May:
13h and 0min - Average daylight in June:
13h and 1min
- Average daylight in July:
13h and 1min - Average daylight in August:
12h and 4min - Average daylight in September:
12h and 1min - Average daylight in October:
11h and 4min - Average daylight in November:
11h and 2min - Average daylight in December:
11h and 1min
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 5min - Average sunshine in February:
8h and 4min - Average sunshine in March:
8h and 3min - Average sunshine in April:
10h and 2min - Average sunshine in May:
10h and 2min - Average sunshine in June:
10h and 1min
- Average sunshine in July:
10h and 5min - Average sunshine in August:
11h and 0min - Average sunshine in September:
10h and 5min - Average sunshine in October:
7h and 1min - Average sunshine in November:
6h and 5min - Average sunshine in December:
6h and 4min
The month with the most sunshine is August (Average sunshine: 11h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).
Average sunshine days
Grantham, Jamaica
- Average sunshine days in January:
6 days - Average sunshine days in February:
3.4 days - Average sunshine days in March:
5.8 days - Average sunshine days in April:
4.4 days - Average sunshine days in May:
2.6 days - Average sunshine days in June:
3.5 days
- Average sunshine days in July:
3 days - Average sunshine days in August:
1.7 days - Average sunshine days in September:
1.7 days - Average sunshine days in October:
1.5 days - Average sunshine days in November:
3.6 days - Average sunshine days in December:
4.6 days
The month with the most sunshine days is January (6 days).
The month with the least sunshine days is October (1.5 days).
Average UV index
Grantham, Jamaica
The months with the highest UV index are May, June, July, August and October (UV index 7).
The months with the lowest UV index are January, February, March, April, September, November and December (UV index 6).
Average cloud cover
Grantham, Jamaica
The month with the most cloud cover is June (Cloud cover 38).
The month with the least cloud cover is September (Cloud cover 29).
Average visibility
Grantham, Jamaica
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
