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
September's weather displays an average high-temperature of a still moderately hot 28.5°C (83.3°F), slightly varied from August's 28.8°C (83.8°F). Guarumal experiences a steady nighttime temperature of 25.3°C (77.5°F) throughout the month of September.Heat index
September's average heat index is estimated at a hot 33°C (91.4°F). Implement more preventive measures, heat cramps and heat exhaustion are probable. Heatstroke might result from extended activity.Evaluating the heat index requires understanding its values in the shade and with gentle winds. Direct sunshine exposure could raise heat index values by as much as 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', reflects the blend of air temperature and relative humidity to give a temperature impression. The influence of weather can be personal, changing with an individual's body mass, height, and level of physical exertion. When exposed to direct sunlight, it's possible for the heat index to increase by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Kids are usually in more danger than grown-ups as they tend to sweat less. Plus, their bigger skin surface in relation to their small frames and increased heat generation due to their activity level make them more susceptible.
Humidity
The average relative humidity in September is 79%.Rainfall
In Guarumal, in September, during 23.6 rainfall days, 131mm (5.16") of precipitation is typically accumulated. Throughout the year, there are 236.2 rainfall days, and 1501mm (59.09") of precipitation is accumulated.Daylight
In September, the average length of the day in Guarumal, Costa Rica, is 12h and 10min.On the first day of September, sunrise is at 05:28 and sunset at 17:46. On the last day of the month, sunrise is at 05:26 and sunset at 17:28 CST.
Sunshine
The average sunshine in September in Guarumal is 8.9h.UV index
January through December, with an average maximum UV index of 7, are months with the highest UV index in Guarumal, Costa Rica. The months with the lowest UV index in Guarumal are January through December, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV rays for average individuals.Note: The maximum UV index, 7 during September, leads to the following recommendations:
Persist in precautions and follow sun safety policies. Keeping sunburn at bay is imperative. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
Frequently asked questions
How hot does it get in Guarumal in September?
What is the average humidity in September in Guarumal?
How many days does it rain in September in Guarumal?
How many hours of daylight does Guarumal have in September?
When is the sunrise / sunset in September in Guarumal?
How long on average sun shines in September in Guarumal?
What is the month with the highest UV index in Guarumal?
What is the month with the lowest UV index in Guarumal?
How high is the UV index in September in Guarumal?
Average temperature in September
Guarumal, Costa Rica
- Average high temperature in September: 28.5°C
The warmest month (with the highest average high temperature) is April (30.4°C).
The month with the lowest average high temperature is October (28.1°C).
- Average low temperature in September: 25.3°C
The months with the highest average low temperature are April and May (26.2°C).
The coldest month (with the lowest average low temperature) is January (24.5°C).
Average pressure in September
Guarumal, Costa Rica
- Average pressure in September: 1010.9mbar
The month with the highest atmospheric pressure is January (1011.4mbar).
The month with the lowest atmospheric pressure is November (1010.6mbar).
Average wind speed in September
Guarumal, Costa Rica
- Average wind speed in September: 7.7km/h
The windiest month (with the highest average wind speed) is March (9.7km/h).
The calmest month (with the lowest average wind speed) is June (7.6km/h).
Average humidity in September
Guarumal, Costa Rica
- Average humidity in September: 79%
The months with the highest relative humidity are June and October (80%).
The months with the lowest relative humidity are February and March (68%).
Average rainfall in September
Guarumal, Costa Rica
- Average rainfall in September: 131mm
The wettest month (with the highest rainfall) is October (383mm).
The driest month (with the least rainfall) is February (11mm).
Average rainfall days in September
Guarumal, Costa Rica
- Average rainfall days in September: 23.6 days
The month with the highest number of rainy days is October (26.1 days).
The month with the least rainy days is February (7.8 days).
Average daylight in September /
Average sunshine in September
Guarumal, 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 36min).
- Average sunshine in September: 8h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is October (Average sunshine: 8h and 6min).
Average sunshine days in September
Guarumal, Costa Rica
- Average sunshine days in September: 5.9 days
The month with the most sunshine days is March (18.6 days).
The month with the least sunshine days is May (4.3 days).
Average UV index in September
Guarumal, 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, October, November and December (UV index 7).
The months with the lowest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).
Average cloud cover in September
Guarumal, Costa Rica
- Average cloud cover in September: 39
The month with the most cloud cover is October (Cloud cover 44).
The month with the least cloud cover is February (Cloud cover 13).
Average visibility in September
Guarumal, Costa Rica
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, June, July, August, September, November and December (10km).
The months with the lowest visibility are May and October (9km).
Guarumal, Costa Rica
Weather forecast for your location
2. Allow the app to use your location
