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
September
Weather in September
Temperature
September proves to be the warmest month, recording an average peak temperature of 30.6°C (87.1°F) and a minimum temperature of 24.3°C (75.7°F).Heat index
The heat index value during September is appraised at a torrid 38°C (100.4°F). Take additional safety steps, risk of heat exhaustion and heat cramps is notable. Prolonged activity may cause heatstroke.Heat index evaluations are typically in the context of light winds and shaded environments. The presence of direct sunlight can raise the heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', unifies temperature and humidity readings to offer a comprehensive feel of warmth. Factors such as metabolic variations, being pregnant, and physical activity can impact an individual's weather perception. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Children frequently do not understand the need for recuperation and hydration. Thirst, being a late manifestation of dehydration, underlines the need to hydrate frequently, especially when engaging in prolonged physical exercises.
Perspiration is essential for the human body; it facilitates cooling through the process of sweat evaporation. Elevated relative humidity diminishes evaporation, thereby reducing the body's ability to shed heat and creating a feeling of being too warm. When heat surpasses the body's release mechanisms, dehydration and overheating risks become pronounced.
Humidity
The months with the lowest humidity are April and September, with an average relative humidity of 76%.Rainfall
The month with the least rainfall is September, when the rain falls for 15.4 days and typically collects 59mm (2.32") of precipitation.Daylight
In Guacimo, the average length of the day in September is 12h and 11min.On the first day of the month, sunrise is at 05:25 and sunset at 17:43. On the last day of September, sunrise is at 05:23 and sunset at 17:25 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 are March through October, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for the ordinary person.Note: In September, a regular UV index of 7 translates into these guidelines:
Sidestep overexposure. Individuals with fair complexions risk burning in fewer than 20 minutes. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is particularly strong, noting that parasols or canopies may not offer total sun protection. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the hottest time of year?
How hot is September?
What are the least humid months?
What is the average humidity in September?
What is the driest month?
How much does it rain in September?
How many hours of daylight does Guacimo have in September?
When is the sunrise / sunset in September?
What month has the most sunshine?
How many hours of sunshine does Guacimo have in September?
What are the months with the highest UV index?
What is the UV index reading in September?
Average temperature in September
Guacimo, 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
Guacimo, 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
Guacimo, 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
Guacimo, 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
Guacimo, 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
Guacimo, 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
Guacimo, 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
Guacimo, 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
Guacimo, 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
Guacimo, 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
Guacimo, 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).
