October weather forecastCastanhal, Brazil

October

Weather in October

October, like September, is another hot spring month in Castanhal, Brazil, with temperature in the range of an average low of 22.4°C (72.3°F) and an average high of 33.5°C (92.3°F).

Temperature

During October and November, Castanhal registers its highest temperatures, averaging a high of 33.5°C (92.3°F).

Heat index

Throughout October, the heat index is calculated to be a life-threatening hot 49°C (120.2°F). Be alert: Heat exhaustion along with heat cramps are probable. Heatstroke is a threat with sustained physical activity.
It is important to note that the heat index values are for shaded areas and light wind scenarios. The direct sunshine could escalate the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a value derived by merging air temperature with the humidity to convey how the climate feels. A person's impression of weather can be shaped by many aspects, among them metabolic variations, pregnancy, and levels of physical activity. The sun, when shining directly, can have a significant impact on the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Kids are usually more vulnerable than adults, given their lesser sweating ability. Along with their larger skin surface relative to their small stature and the excess heat due to their activity, their risk is amplified.
One way the human body deals with excessive warmth is by perspiring and allowing sweat to evaporate. Under high air temperature and high humidity (high heat index) conditions, the body's ability to perspire is compromised, increasing the sensation of heat. If heat absorption exceeds the body's cooling ability, body temperature can elevate, resulting in potential thermal illnesses.

Humidity

In Castanhal, the average relative humidity in October is 77%.

Rainfall

In October, the rain falls for 24 days. Throughout October, 58mm (2.28") of precipitation is accumulated. In Castanhal, Brazil, during the entire year, the rain falls for 332.9 days and collects up to 1589mm (62.56") of precipitation.

Daylight

In Castanhal, the average length of the day in October is 12h and 8min.
On the first day of the month, sunrise is at 05:57 and sunset at 18:04. On the last day of October, in Castanhal, sunrise is at 05:50 and sunset at 18:00 -03.

Sunshine

In October, the average sunshine in Castanhal is 8h.

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 estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV rays for ordinary individuals.
Note: The UV index of 7 during October leads to these advisories:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Avoid direct Sun exposure and seek shade from 10 a.m. to 4 p.m., the period of highest UV radiation. Remember, however, that not all shade structures offer full protection. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.

Updated: Feb 2, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Castanhal witnesses its peak temperatures during October and November, when the average high-temperature reaches 33.5°C (92.3°F).

In October, in Castanhal, the average high-temperature is 33.5°C (92.3°F), and the average low-temperature is 22.4°C (72.3°F). In October, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, is calculated to be 49°C (120.2°F).

In October, the average relative humidity in Castanhal, Brazil, is 77%.

In Castanhal, in October, it is raining for 24 days, with typically 58mm (2.28") of accumulated precipitation.

In October, the average day length is 12h and 8min.

In October, on the first day of the month, sunrise is at 05:57 and sunset at 18:04. On the last day of the month, in Castanhal, Brazil, sunrise is at 05:50 and sunset at 18:00 -03.

The average sunshine duration in October in Castanhal, Brazil, is 8h.

May, July, September through November, with an average maximum UV index of 7, are months with the highest UV index in Castanhal, Brazil.

In Castanhal, the average daily maximum UV index in October is 7. A UV Index value of 6 to 7 symbolizes a high hazard to health from exposure to the Sun's UV radiation.

Today

Tomorrow

Long-term

Year J F M A M J J A S October N D

Sep

October

Nov

Average high temperature

32.9°C

33.5°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

7.2km/h

7.5km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average daylight

Average sunshine

Average sunshine days

3.9

5.4

Average UV index

Average cloud cover

Average visibility

Average temperature in October
Castanhal, Brazil

Average high temperature in October: 33.5°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 October: 22.4°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 October
Castanhal, Brazil

Average pressure in October: 1010.2mbar

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 October
Castanhal, Brazil

Average wind speed in October: 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 October
Castanhal, Brazil

Average humidity in October: 77%

The month with the highest relative humidity is April (92%).
The month with the lowest relative humidity is November (76%).

Average rainfall in October
Castanhal, Brazil

Average rainfall in October: 58mm

The wettest month (with the highest rainfall) is March (252mm).
The driest month (with the least rainfall) is September (45mm).

Average rainfall days in October
Castanhal, Brazil

Average rainfall days in October: 24 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 October /
Average sunshine in October
Castanhal, Brazil

Average daylight in October: 12h and 6min

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 October: 8h and 0min

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 October
Castanhal, Brazil

Average sunshine days in October: 5.4 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 October
Castanhal, Brazil

Average UV index in October: 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 October
Castanhal, Brazil

Average cloud cover in October: 44

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).