September weather forecast and climate
Hacienda Orosí, Costa Rica

Weather in September

September, the first month of the autumn, in Hacienda Orosí, is still a tropical month, with average temperature varying between 30.1°C (86.2°F) and 22.9°C (73.2°F).

Temperature

In September, the average high-temperature is essentially the same as in August - a still hot 30.1°C (86.2°F). The average low-temperature, in Hacienda Orosí, is 22.9°C (73.2°F).

Heat index

The average heat index is evaluated at a sweltering 39.5°C (103.1°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'apparent temperature', 'real feel', or 'felt air temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Additional factors like activity, metabolic differences, differences in body mass, height, and shape, and wind affect individual temperature impact. Bear in mind that direct sunshine exposure increases weather impact, and may raise 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.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

The average relative humidity is 85%.

Rainfall

In September, in Hacienda Orosí, Costa Rica, the rain falls for 27.7 days. Throughout September, 187mm (7.36") of precipitation is accumulated. In Hacienda Orosí, during the entire year, the rain falls for 188.5 days and collects up to 1202mm (47.32") of precipitation.

Daylight

The average length of the day is 12.2h.

Sunshine

In Hacienda Orosí, the average sunshine is 8.3h.

UV index

January through October and December, with an average maximum UV index of 7, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high health hazard from the exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 7 in September interpret into the following advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in September in Hacienda Orosí?

In September, the average high-temperature is 30.1°C (86.2°F), and the average low-temperature is 22.9°C (73.2°F). In September, the average heat index (a.k.a. 'apparent temperature', 'real feel'), that combines relative humidity and air temperature, is appraised at 39.5°C (103.1°F).

What is the average humidity in September in Hacienda Orosí?

In September, the average relative humidity is 85%.

How many days does it rain in September in Hacienda Orosí?

In Hacienda Orosí, during September, the rain falls for 27.7 days and regularly aggregates up to 187mm (7.36") of precipitation.

What is the average length of the day in September in Hacienda Orosí?

The average length of the day in September in Hacienda Orosí, Costa Rica, is 12.2h.

How many hours of sunshine does Hacienda Orosí have in September?

In September, the average sunshine in Hacienda Orosí, Costa Rica, is 8.3h.

What are the months with the highest UV index in Hacienda Orosí?

Months with the highest UV index in Hacienda Orosí, Costa Rica, are January through October and December, with an average maximum UV index of 7.

What is the UV index intensity in September in Hacienda Orosí?

In Hacienda Orosí, Costa Rica, the average daily maximum UV index in September is 7. A UV Index value of 6 to 7 symbolizes a high health risk from unsafe exposure to the Sun's UV rays.

Average temperature in September
Hacienda Orosí, Costa Rica

Average temperature in September - Hacienda Orosí, Costa Rica
  • Average high temperature in September: 30.1°C

The warmest month (with the highest average high temperature) is April (34.9°C).
The month with the lowest average high temperature is October (29°C).

  • Average low temperature in September: 22.9°C

The month with the highest average low temperature is May (24.8°C).
The coldest month (with the lowest average low temperature) is January (22°C).

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Average pressure in September
Hacienda Orosí, Costa Rica

Average pressure in September - Hacienda Orosí, Costa Rica
  • Average pressure in September: 1010.4mbar

The month with the highest atmospheric pressure is January (1011.3mbar).
The month with the lowest atmospheric pressure is October (1010.1mbar).

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Average wind speed in September
Hacienda Orosí, Costa Rica

Average wind speed in September - Hacienda Orosí, Costa Rica
  • Average wind speed in September: 6.8km/h

The windiest month (with the highest average wind speed) is February (21.4km/h).
The calmest month (with the lowest average wind speed) is September (6.8km/h).

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Average humidity in September
Hacienda Orosí, Costa Rica

Average humidity in September - Hacienda Orosí, Costa Rica
  • Average humidity in September: 85%

The month with the highest relative humidity is October (87%).
The month with the lowest relative humidity is April (62%).

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Average rainfall in September
Hacienda Orosí, Costa Rica

Average rainfall in September - Hacienda Orosí, Costa Rica
  • Average rainfall in September: 187mm

The wettest month (with the highest rainfall) is October (274mm).
The driest month (with the least rainfall) is March (1mm).

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Average rainfall days in September
Hacienda Orosí, Costa Rica

Average rainfall days in September - Hacienda Orosí, Costa Rica
  • Average rainfall days in September: 27.7 days

The month with the highest number of rainy days is September (27.7 days).
The month with the least rainy days is February (2 days).

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Average daylight in September /
Average sunshine in September
Hacienda Orosí, Costa Rica

Average daylight in September / Average sunshine in September - Hacienda Orosí, Costa Rica
  • Average daylight in September: 12.2h

The month with the longest days is June (Average daylight: 12.8h).
The month with the shortest days is December (Average daylight: 11.5h).

  • Average sunshine in September: 8.3h

The month with the most sunshine is July (Average sunshine: 10.2h).
Months with the least sunshine are January and October (Average sunshine: 7.6).

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Average sunshine days in September
Hacienda Orosí, Costa Rica

Average sunshine days in September - Hacienda Orosí, Costa Rica
  • Average sunshine days in September: 1.1 days

The month with the most sunshine days is March (28.8 days).
The month with the least sunshine days is September (1.1 days).

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Average UV index in September
Hacienda Orosí, Costa Rica

Average UV index in September - Hacienda Orosí, Costa Rica
  • Average UV index in September: 7

Months with the highest UV index are January, February, March, April, May, June, July, August, September, October and December (UV index 7).
The month with the lowest UV index is November (UV index 6).

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Average cloud cover in September
Hacienda Orosí, Costa Rica

Average cloud cover in September - Hacienda Orosí, Costa Rica
  • Average cloud cover in September: 42

The month with the most cloud cover is October (Cloud cover 46).
The month with the least cloud cover is February (Cloud cover 10).

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Average visibility in September
Hacienda Orosí, Costa Rica

Average visibility in September - Hacienda Orosí, Costa Rica
  • Average visibility in September: 8km

Months with the highest visibility are January, February, March, April, May and December (10km).
Months with the lowest visibility are September and October (8km).

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