September weather forecast
Liberia, Costa Rica

September is characterized by less visibility, dropping to 8km (5mi) from 9km (5.6mi) in August. This reduced visibility is due to heavy cloud cover, which also hampers sunshine hours. Liberia's weather continues to retain a cooler temperature, resembling the preceding months. As the rainfall continues on a downswing and days become considerably shorter, the rate of evaporation decreases. Consequently, this results in increasing relative humidity, which peaks at 85%, the highest throughout the year.

Temperature

September in Liberia is marked by an average high-temperature of a still hot 30.1°C (86.2°F), almost identical to the preceding month. In the month of September, the average low-temperature in Liberia usually rests at an agreeable 22.9°C (73.2°F).

Heat index

The heat index value during September is estimated at a fiery hot 39°C (102.2°F). Implement additional preventive actions, heat cramps and heat exhaustion are potential hazards. Heatstroke could follow prolonged activity.
The metrics for the heat index are tailored for both shady environments and light winds. Direct sunlight has the potential to heighten heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', embodies the combination of air temperature and moisture content to illustrate perceived heat. One's weather perception can be influenced by a range of factors including metabolic differences, being pregnant, and their level of physical activity. Direct sun rays have a notable impact on perceived temperature, which can raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Young ones often disregard the necessity to rest and hydrate. Thirst usually indicates advanced dehydration - hence, it is key to stay hydrated, particularly during ongoing physical activities.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. When the air contains significant moisture, the efficiency of the evaporation process decreases, preventing the body from cooling down effectively and creating a feeling of overheating. Heat disorders may be on the horizon when body temperatures rise from inadequate heat management.

Humidity

The average relative humidity in September is 85%.

Rainfall

In September, in Liberia, the rain falls for 27.7 days. Throughout September, 187mm (7.36") of precipitation is accumulated. Throughout the year, there are 188.5 rainfall days, and 1202mm (47.32") of precipitation is accumulated.

Daylight

In September, the average length of the day in Liberia is 12h and 11min.
On the first day of September in Liberia, Costa Rica, sunrise is at 05:32 and sunset at 17:50. On the last day of the month, sunrise is at 05:30 and sunset at 17:32 CST.

Sunshine

In September, 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 value of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for the ordinary person.
Note: The average daily UV index of 7 in September transforms into the following instructions:
Deter overexposure. Protecting against the sun's effects is essential. Between 10 a.m. and 4 p.m., UV radiation is strongest. Make an effort to avoid direct sunlight during this time, remembering that shade structures may not provide full sun protection. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.