July weather forecastGrantham, Jamaica
July
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).Temperature
July and August are the warmest months, with an average high-temperature of 31.7°C (89.1°F).Heat index
For most parts of July, the heat index is computed to be a scorching 42°C (107.6°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.Bear in mind that the heat index values are determined for shaded areas and light breezes. Exposure to direct sunlight may make the heat index values climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. An individual's perception of weather can be affected by a variety of elements including metabolic differences, being pregnant, and their level of physical exertion. Given direct exposure to sunlight, one might experience a rise in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. With excessive moisture in the atmosphere, the effectiveness of the evaporation process is decreased, causing the body to cool down less efficiently, leading to a sensation of overheating. Overheating and dehydration threats arise when heat gain goes beyond what the body can comfortably shed.
Humidity
March, July and August, with an average relative humidity of 77%, are the least humid months.Rainfall
In Grantham, during July, the rain falls for 21.2 days and regularly aggregates up to 84mm (3.31") of precipitation. Throughout the year, in Grantham, there are 265.1 rainfall days, and 806mm (31.73") of precipitation is accumulated.Daylight
In Grantham, the average length of the day in July is 13h and 5min.On the first day of July, sunrise is at 05:35 and sunset at 18:47. On the last day of the month, sunrise is at 05:45 and sunset at 18:42 EST.
Sunshine
In July, the average sunshine in Grantham is 10.8h.UV index
The months with the highest UV index in Grantham, Jamaica, are May through August and October, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for average individuals.Note: The maximum UV index of 7 during July translates into these guidelines:
Steer clear of overexposure. Fair-skinned individuals can be scorched in less than 20 minutes. Minimize exposure to direct sunlight and seek shade from 10 a.m. to 4 p.m., when UV radiation is most intense, but remember that shade structures may not offer complete protection. Experience reduced UV exposure by about half when donning a wide-brim hat.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in July
Grantham, Jamaica
- Average high temperature in July: 31.7°C
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).
- Average low temperature in July: 23.5°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 in July
Grantham, Jamaica
- Average pressure in July: 1014.6mbar
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 in July
Grantham, Jamaica
- Average wind speed in July: 8.8km/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 in July
Grantham, Jamaica
- Average humidity in July: 77%
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 in July
Grantham, Jamaica
- Average rainfall in July: 84mm
The wettest month (with the highest rainfall) is October (123mm).
The driest month (with the least rainfall) is January (26mm).
Average rainfall days in July
Grantham, Jamaica
- Average rainfall days in July: 21.2 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 in July /
Average sunshine in July
Grantham, Jamaica
- Average daylight in July: 13h 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 July: 10h and 48min
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 in July
Grantham, Jamaica
- Average sunshine days in July: 3 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 in July
Grantham, Jamaica
- Average UV index in July: 7
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 in July
Grantham, Jamaica
- Average cloud cover in July: 30
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 in July
Grantham, Jamaica
- Average visibility in July: 9km
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).
