September weather forecastDevon, Jamaica
September
Weather in September
September, the first month of the autumn in Devon, is still a warm month, with an average temperature fluctuating between 29.4°C (84.9°F) and 26.2°C (79.2°F).Temperature
The onset of September brings with it an average high-temperature of a still moderately hot 29.4°C (84.9°F), showing a negligible variation from the month before. The nighttime temperature demonstrates a marginal decline, averaging at a still warm 26.2°C (79.2°F) during September.Heat index
For September, the heat index is estimated at a fiery hot 35°C (95°F). More protective measures are required - heat exhaustion and heat cramps are likely. Heatstroke may follow lengthy activity.Research indicates the heat index considers values in shaded locales and with light winds. Heat index values have the potential to be boosted by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'real feel' or 'feels like', represents the fusion of temperature and moisture in the air to suggest how warm it feels. The individual's impression of temperature can be shaped by additional aspects such as metabolic variations, physical activity, and clothing. Direct sunlight can potentially raise the heat index by 15 Fahrenheit (8 Celsius) degrees, so it's crucial to consider. Heat index values are particularly important for children. Young individuals usually face greater risks than adults as their sweat production is less. Also, their larger skin surface relative to their small bodies and the high heat generation due to their activity contributes to their vulnerability.
The natural cooling mechanism in humans involves perspiration, where the evaporation of sweat balances out excessive warmth. During conditions of high air temperature and humidity (high heat index), the body's ability to perspire is inhibited, increasing the sensation of warmth. Heat-related complications, like dehydration, can manifest if the body's heat gain exceeds its dissipation capacity.
Humidity
In September, the average relative humidity is 78%.Rainfall
The month with the most rainfall is September, when the rain falls for 19.2 days and typically aggregates up to 99mm (3.9") of precipitation.Snowfall
The only month with snowfall is September. September is the month with the most snowfall. Snow falls for 0.1 days and accumulates 1mm (0.04") of snow.Daylight
In September, the average length of the day in Devon is 12h and 14min.On the first day of the month, sunrise is at 05:55 and sunset at 18:23. On the last day of September, sunrise is at 06:00 and sunset at 17:59 EST.
Sunshine
The average sunshine in September in Devon is 11.1h.UV index
April through December, with an average maximum UV index of 7, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for the average person.Note: A daily maximum UV index of 7 in September translates into the following instructions:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. Stay in the shade and limit direct sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its strongest. Remember, however, that not all shade structures provide full sun protection. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Devon, Jamaica
- Average high temperature in September: 29.4°C
The warmest month (with the highest average high temperature) is August (29.7°C).
The months with the lowest average high temperature are February and March (26.6°C).
- Average low temperature in September: 26.2°C
The month with the highest average low temperature is August (26.3°C).
The coldest month (with the lowest average low temperature) is March (23.1°C).
Average pressure in September
Devon, Jamaica
- Average pressure in September: 1012.4mbar
The month with the highest atmospheric pressure is January (1015.7mbar).
The month with the lowest atmospheric pressure is October (1011.6mbar).
Average wind speed in September
Devon, Jamaica
- Average wind speed in September: 13.1km/h
The windiest month (with the highest average wind speed) is June (17.9km/h).
The calmest month (with the lowest average wind speed) is September (13.1km/h).
Average humidity in September
Devon, Jamaica
- Average humidity in September: 78%
The months with the highest relative humidity are May, June, November and December (79%).
The month with the lowest relative humidity is March (77%).
Average rainfall in September
Devon, Jamaica
- Average rainfall in September: 99mm
The wettest month (with the highest rainfall) is September (99mm).
The driest month (with the least rainfall) is February (27mm).
Average rainfall days in September
Devon, Jamaica
- Average rainfall days in September: 19.2 days
The month with the highest number of rainy days is October (23.9 days).
The month with the least rainy days is February (15 days).
Average snowfall in September
Devon, Jamaica
- Average snowfall in September: 1mm
The month with the highest snowfall is September (1mm).
The months with the least snowfall are January, February, March, April, May, June, July, August, October, November and December (0mm).
Average snowfall days in September
Devon, Jamaica
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is September (0.1 days).
The months with the least snowfall days are January, February, March, April, May, June, July, August, October, November and December (0 days).
Average daylight in September /
Average sunshine in September
Devon, Jamaica
- Average daylight in September: 12h and 12min
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 September: 11h and 6min
The month with the most sunshine is August (Average sunshine: 11h and 18min).
The month with the least sunshine is December (Average sunshine: 6h and 24min).
Average sunshine days in September
Devon, Jamaica
- Average sunshine days in September: 3.3 days
The month with the most sunshine days is January (9.6 days).
The month with the least sunshine days is September (3.3 days).
Average UV index in September
Devon, Jamaica
- Average UV index in September: 7
The months with the highest UV index are April, May, June, July, August, September, October, November and December (UV index 7).
The months with the lowest UV index are January, February and March (UV index 6).
Average cloud cover in September
Devon, Jamaica
- Average cloud cover in September: 24
The months with the most cloud cover are November and December (Cloud cover 33).
The months with the least cloud cover are August and September (Cloud cover 24).
Average visibility in September
Devon, Jamaica
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
