Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
Siquirres records the warmest temperatures in September, averaging a high of 30.6°C (87.1°F) and a low of 24.3°C (75.7°F).Heat index
The heat index for September is calculated to be a sweltering 38°C (100.4°F). More safety actions are required, heat exhaustion and heat cramps are probable. Long-term activity may precipitate heatstroke.Heat index guidelines indicate values are for light wind scenarios and shaded regions. If directly exposed to the sun, the heat index could rise by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. The effect of weather is individual, with a variety of people experiencing it differently due to distinctions in body mass, height, and level of activity. Direct sun rays can make one feel hotter, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Young ones often do not realize the necessity to rest and replenish their fluids. Thirst is a delayed indication of dehydration - keeping hydrated, particularly in prolonged physical activity, is crucial.
The body's natural response to excessive warmth is perspiration, as it allows for cooling through sweat evaporation. A surge in relative humidity can disrupt the body's normal cooling function by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. Rising body temperatures resulting from an imbalance in heat absorption can lead to potential thermal issues.
Humidity
April and September, with an average relative humidity of 76%, are the least humid months in Siquirres, Costa Rica.Rainfall
The month with the least rainfall in Siquirres is September, when the rain falls for 15.4 days and typically collects 59mm (2.32") of precipitation.Daylight
In September, the average length of the day in Siquirres is 12h and 11min.On the first day of the month, sunrise is at 05:24 and sunset at 17:42. On the last day of September, sunrise is at 05:22 and sunset at 17:24 CST.
Sunshine
September has the most sunshine of the year, with an average of 9h of sunshine.UV index
The months with the highest UV index in Siquirres are March through October, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV rays for average individuals.Note: The UV index of 7 during September translates into the following guidance:
Dodge overexposure. Fair-skinned people can get singed in less than 20 minutes. To the best of your ability, limit your exposure to the sun between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Frequently asked questions
What is the warmest month in Siquirres?
How hot is September in Siquirres?
What are the least humid months in Siquirres?
What is the average humidity in September in Siquirres?
What is the driest month in Siquirres?
How many days does it rain in September in Siquirres?
How many hours of daylight does Siquirres have in September?
What time are sunrise and sunset in September in Siquirres?
What month has the most sunshine in Siquirres?
How many hours of sunshine does Siquirres have in September?
What is the month with the highest UV index in Siquirres?
What is the UV index intensity in September in Siquirres?
Average temperature in September
Siquirres, Costa Rica
- Average high temperature in September: 30.6°C
The warmest month (with the highest average high temperature) is September (30.6°C).
The month with the lowest average high temperature is January (27.4°C).
- Average low temperature in September: 24.3°C
The month with the highest average low temperature is June (24.7°C).
The coldest month (with the lowest average low temperature) is January (22.3°C).
Average pressure in September
Siquirres, Costa Rica
- Average pressure in September: 1011.1mbar
The month with the highest atmospheric pressure is January (1013.1mbar).
The month with the lowest atmospheric pressure is October (1010.7mbar).
Average wind speed in September
Siquirres, Costa Rica
- Average wind speed in September: 6.8km/h
The windiest months (with the highest average wind speed) are February and March (8.9km/h).
The calmest months (with the lowest average wind speed) are August and September (6.8km/h).
Average humidity in September
Siquirres, Costa Rica
- Average humidity in September: 76%
The month with the highest relative humidity is November (80%).
The months with the lowest relative humidity are April and September (76%).
Average rainfall in September
Siquirres, Costa Rica
- Average rainfall in September: 59mm
The wettest month (with the highest rainfall) is December (214mm).
The driest month (with the least rainfall) is September (59mm).
Average rainfall days in September
Siquirres, Costa Rica
- Average rainfall days in September: 15.4 days
The month with the highest number of rainy days is July (23.5 days).
The month with the least rainy days is September (15.4 days).
Average daylight in September /
Average sunshine in September
Siquirres, Costa Rica
- Average daylight in September: 12h and 1min
The month with the longest days is June (Average daylight: 12h and 42min).
The month with the shortest days is December (Average daylight: 11h and 30min).
- Average sunshine in September: 9h and 0min
The month with the most sunshine is September (Average sunshine: 9h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 18min).
Average sunshine days in September
Siquirres, Costa Rica
- Average sunshine days in September: 13.9 days
The month with the most sunshine days is October (14.1 days).
The month with the least sunshine days is July (7 days).
Average UV index in September
Siquirres, Costa Rica
- Average UV index in September: 7
The months with the highest UV index are March, April, May, June, July, August, September and October (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 6).
Average cloud cover in September
Siquirres, Costa Rica
- Average cloud cover in September: 34
The month with the most cloud cover is December (Cloud cover 55).
The month with the least cloud cover is September (Cloud cover 34).
Average visibility in September
Siquirres, Costa Rica
- Average visibility in September: 10km
The months with the highest visibility are February, March, April, May, June, August, September and October (10km).
The months with the lowest visibility are January, July, November and December (9km).
Siquirres, Costa Rica
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