September weather forecast
Tronadora, Costa Rica

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Weather in September

As September rolls around, the weather in Tronadora assures it is still very much in the middle of the rainy season. Despite the persistent rain, the temperature ranges comfortably between 23.2°C (73.8°F) and 28.9°C (84°F) making it fairly warm throughout the day. The rainfall adds to the city's charm, painting it with deeper shades of green. Compared to the following month, September's rain showers are less intense. While this might deter some visitors, it imparts a serene atmosphere to the city.

Temperature

The advent of September in Tronadora, Costa Rica, denotes an average high-temperature of a still warm 28.9°C (84°F), subtly different from August's 29.4°C (84.9°F). Tronadora experiences an average nighttime temperature of 23.2°C (73.8°F) in the month of September.

Heat index

Throughout September, the heat index is appraised at a fiery hot 35°C (95°F). Exercise increased caution, heat cramps and heat exhaustion are potential hazards. Continuous activity could lead to heatstroke.
The metrics for the heat index are tailored for both shady environments and light winds. Direct sunlight exposure may cause a 15 Fahrenheit (8 Celsius) degrees rise in the heat index.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. A person's impression of weather can be shaped by several aspects, among them metabolic variations, pregnancy, and levels of physical activity. Consider the sun's direct rays and their impact; they can potentially increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant 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.
Perspiration is the body's default response to elevated temperatures, as it promotes the evaporation of sweat to achieve cooling. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. 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 in September is 82%.

Rainfall

In Tronadora, during September, the rain falls for 27.7 days and regularly aggregates up to 193mm (7.6") of precipitation. Throughout the year, in Tronadora, there are 218.6 rainfall days, and 1456mm (57.32") of precipitation is accumulated.

Daylight

In Tronadora, the average length of the day in September is 12h and 11min.
On the first day of September, sunrise is at 05:30 and sunset at 17:48. On the last day of the month, sunrise is at 05:28 and sunset at 17:30 CST.

Sunshine

In Tronadora, the average sunshine in September is 8.7h.

UV index

The months with the highest UV index in Tronadora are January through September and December, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A maximum UV index of 7 in September translates into the following recommendations:
Employ safeguards and advocate sun safety protocols. Shielding against skin and eye damage is crucial. Make an effort to avoid direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation, and note that objects like parasols or canopies might not offer full sun protection. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.

Frequently asked questions

How hot does it get in Tronadora in September?

In September, in Tronadora, the average high-temperature is 28.9°C (84°F), and the average low-temperature is 23.2°C (73.8°F). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which represents the influence of relative humidity on air temperature, in September is appraised at 35°C (95°F).

What is the average humidity in September in Tronadora?

The average relative humidity in September is 82%.

How many days does it rain in September in Tronadora?

In Tronadora, during September, the rain falls for 27.7 days and regularly aggregates up to 193mm (7.6") of precipitation.

How many hours of daylight does Tronadora have in September?

In September, the average day length in Tronadora is 12h and 11min.

When is the sunrise / sunset in September in Tronadora?

On the first day of September, sunrise is at 05:30 and sunset at 17:48. On the last day of the month, sunrise is at 05:28 and sunset at 17:30 CST.

How many hours of sunshine does Tronadora have in September?

The average sunshine duration in September in Tronadora is 8.7h.

When is the highest UV index in Tronadora?

January through September and December, with an average maximum UV index of 7, are months with the highest UV index in Tronadora, Costa Rica.

What is the UV index reading in September in Tronadora?

In Tronadora, the average daily maximum UV index in September is 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to UV radiation.

Average temperature in September
Tronadora, Costa Rica

Average temperature in September - Tronadora, Costa Rica
  • Average high temperature in September: 28.9°C

The warmest month (with the highest average high temperature) is March (32.8°C).
The month with the lowest average high temperature is October (28.4°C).

  • Average low temperature in September: 23.2°C

The month with the highest average low temperature is May (24.6°C).
The coldest month (with the lowest average low temperature) is January (21.9°C).

Average pressure in September
Tronadora, Costa Rica

Average pressure in September - Tronadora, Costa Rica
  • Average pressure in September: 1010.8mbar

The month with the highest atmospheric pressure is January (1011.5mbar).
The month with the lowest atmospheric pressure is October (1010.5mbar).

Average wind speed in September
Tronadora, Costa Rica

Average wind speed in September - Tronadora, Costa Rica
  • Average wind speed in September: 5.5km/h

The windiest month (with the highest average wind speed) is February (11.1km/h).
The calmest month (with the lowest average wind speed) is September (5.5km/h).

Average humidity in September
Tronadora, Costa Rica

Average humidity in September - Tronadora, Costa Rica
  • Average humidity in September: 82%

The month with the highest relative humidity is October (83%).
The month with the lowest relative humidity is March (63%).

Average rainfall in September
Tronadora, Costa Rica

Average rainfall in September - Tronadora, Costa Rica
  • Average rainfall in September: 193mm

The wettest month (with the highest rainfall) is October (330mm).
The driest month (with the least rainfall) is February (3mm).

Average rainfall days in September
Tronadora, Costa Rica

Average rainfall days in September - Tronadora, 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 (3.1 days).

Average daylight in September /
Average sunshine in September
Tronadora, Costa Rica

Average daylight in September / Average sunshine in September - Tronadora, 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: 8h and 4min

The month with the most sunshine is March (Average sunshine: 9h and 54min).
The month with the least sunshine is October (Average sunshine: 8h and 0min).

Average sunshine days in September
Tronadora, Costa Rica

Average sunshine days in September - Tronadora, Costa Rica
  • Average sunshine days in September: 1.4 days

The month with the most sunshine days is January (25.8 days).
The month with the least sunshine days is September (1.4 days).

Average UV index in September
Tronadora, Costa Rica

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

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

Average cloud cover in September
Tronadora, Costa Rica

Average cloud cover in September - Tronadora, 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).

Average visibility in September
Tronadora, Costa Rica

Average visibility in September - Tronadora, Costa Rica
  • Average visibility in September: 9km

The months with the highest visibility are January, February, March, April and December (10km).
The months with the lowest visibility are May, June, July, August, September, October and November (9km).

Tronadora, Costa Rica

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