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
Castanhal sees the arrival of September with an average high-temperature of a still hot 32.9°C (91.2°F), indicating a subtle variation from August. Castanhal records an average temperature drop to a pleasant 22.1°C (71.8°F) in September.Heat index
The heat index in September is calculated to be a burning hot 47°C (116.6°F). Prudent: Heat cramps and heat exhaustion are likely. Heatstroke becomes imminent with sustained exertion.Metrics for the heat index primarily focus on shaded spots and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', embodies the combination of air temperature and moisture content to illustrate perceived heat. The effect is experienced differently by individuals, hinging on unique characteristics such as body mass, stature, and level of activity. Recognize that direct exposure to the sun can escalate the heat effect, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values hold particular importance for children. Younglings are generally more in peril than adults due to their reduced perspiration. Coupled with a larger skin surface relative to their tiny bodies and greater heat production because of their activity, they become more at risk.
Sweat evaporation plays a crucial role in cooling the human body, a process enabled by perspiration. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. Rising body temperatures due to excess heat retention could signify impending heat disorders.
Humidity
In September, the average relative humidity in Castanhal is 79%.Rainfall
The month with the least rainfall in Castanhal is September, when the rain falls for 24.7 days and typically collects 45mm (1.77") of precipitation.Daylight
In September, the average length of the day is 12h and 7min.On the first day of September in Castanhal, sunrise is at 06:08 and sunset at 18:14. On the last day of the month, sunrise is at 05:57 and sunset at 18:05 -03.
Sunshine
In September, the average sunshine in Castanhal is 8.2h.UV index
The months with the highest UV index in Castanhal are May, July, September through November, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV rays for the average person.Note: The UV index of 7 during September leads to these advisories:
Inhibit overexposure. Warding off sun damage is of utmost importance. Limit your exposure to the sun's UV radiation, which is strongest between 10 a.m. and 4 p.m., and note that parasols or canopies may not provide full sun protection. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
Frequently asked questions
How hot is it in Castanhal in September?
What is the average humidity in September in Castanhal?
What is the driest month in Castanhal?
How many days does it rain in September in Castanhal?
How many hours of daylight does Castanhal have in September?
What time are sunrise and sunset in September in Castanhal?
How many hours of sunshine does Castanhal have in September?
When is the highest UV index in Castanhal?
How high is the UV index in September in Castanhal?
Average temperature in September
Castanhal, Brazil
- Average high temperature in September: 32.9°C
The warmest months (with the highest average high temperature) are October and November (33.5°C).
The months with the lowest average high temperature are March and April (29.7°C).
- Average low temperature in September: 22.1°C
The month with the highest average low temperature is December (23°C).
The coldest month (with the lowest average low temperature) is July (21.5°C).
Average pressure in September
Castanhal, Brazil
- Average pressure in September: 1011.7mbar
The month with the highest atmospheric pressure is July (1012.7mbar).
The month with the lowest atmospheric pressure is November (1009.2mbar).
Average wind speed in September
Castanhal, Brazil
- Average wind speed in September: 6.9km/h
The windiest months (with the highest average wind speed) are September, October and November (6.9km/h).
The calmest month (with the lowest average wind speed) is April (4.8km/h).
Average humidity in September
Castanhal, Brazil
- Average humidity in September: 79%
The month with the highest relative humidity is April (92%).
The month with the lowest relative humidity is November (76%).
Average rainfall in September
Castanhal, Brazil
- Average rainfall in September: 45mm
The wettest month (with the highest rainfall) is March (252mm).
The driest month (with the least rainfall) is September (45mm).
Average rainfall days in September
Castanhal, Brazil
- Average rainfall days in September: 24.7 days
The month with the highest number of rainy days is March (30.8 days).
The month with the least rainy days is November (22.2 days).
Average daylight in September /
Average sunshine in September
Castanhal, Brazil
- Average daylight in September: 12h and 1min
The month with the longest days is December (Average daylight: 12h and 12min).
The month with the shortest days is June (Average daylight: 12h and 0min).
- Average sunshine in September: 8h and 1min
The month with the most sunshine is August (Average sunshine: 8h and 36min).
The month with the least sunshine is March (Average sunshine: 5h and 36min).
Average sunshine days in September
Castanhal, Brazil
- Average sunshine days in September: 3.9 days
The month with the most sunshine days is November (6 days).
The months with the least sunshine days are March and April (0 days).
Average UV index in September
Castanhal, Brazil
- Average UV index in September: 7
The months with the highest UV index are May, July, September, October and November (UV index 7).
The months with the lowest UV index are January, February, March, April, June, August and December (UV index 6).
Average cloud cover in September
Castanhal, Brazil
- Average cloud cover in September: 45
The months with the most cloud cover are March and April (Cloud cover 71).
The months with the least cloud cover are October and November (Cloud cover 44).
Average visibility in September
Castanhal, Brazil
- Average visibility in September: 7km
The months with the highest visibility are October, November and December (8km).
The month with the lowest visibility is May (5km).
Castanhal, Brazil
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