January weather forecast
Rio das Ostras, Brazil

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Weather in January

January, like December, in Rio das Ostras, Brazil, is another warm summer month, with an average temperature varying between 28.8°C (83.8°F) and 23.1°C (73.6°F).

Temperature

Rio das Ostras's entry into January measures an average high-temperature of a still warm 28.8°C (83.8°F), closely parallel to the preceding month. Rio das Ostras's temperature in January lowers to a consistent average of 23.1°C (73.6°F) during the nights.

Heat index

The heat index value during January is evaluated at a sweltering 35°C (95°F). Implement heightened safety measures - risk of heat exhaustion and heat cramps is increased. Prolonged activity may result in heatstroke.
It is important to note that the heat index values are for shaded areas and light wind scenarios. Heat index values may be hiked up by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. The effect is experienced differently by individuals, hinging on unique characteristics such as body mass, stature, and level of activity. You should know that direct sun exposure can heighten weather effects, potentially elevating the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Young ones regularly neglect the requirement for rest and fluid replenishment. Thirst is a late stage of dehydration - so, it is necessary to keep hydrated, particularly during extended periods of physical exertion.
When faced with excessive heat, the human body begins to perspire, utilizing the cooling benefits of sweat evaporation. An elevated level of relative humidity hinders evaporation, leading to decreased heat elimination from the body, inducing a sensation of excess heat. Overheating and dehydration threats arise when heat gain goes beyond what the body can comfortably shed.

Humidity

The average relative humidity in January is 82%.

Rainfall

In Rio das Ostras, in January, during 19.2 rainfall days, 84mm (3.31") of precipitation is typically accumulated. In Rio das Ostras, Brazil, during the entire year, the rain falls for 179.7 days and collects up to 674mm (26.54") of precipitation.

Sea temperature

In Rio das Ostras, in January, the average water temperature is 24.5°C (76.1°F).
Note: Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 24.5°C (76.1°F) water may be enjoyable. (FYI: The official water temperature required for the Olympic swimming competition is 25°C (77°F) to 28°C (82.4°F).)

Daylight

The average length of the day in January is 13h and 20min.
On the first day of the month, sunrise is at 05:06 and sunset at 18:35. On the last day of January, sunrise is at 05:27 and sunset at 18:34 -03.

Sunshine

The average sunshine in January in Rio das Ostras is 8.8h.

UV index

With an average maximum UV index of 7, January is the month with the highest UV index. A UV Index of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: The daily maximum UV index of 7 in January interprets into the following advice:
Uphold preventive measures and conform to sun safety guidelines. Defending against skin and eye harm is crucial. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. Always opt for UVA and UVB-resistant sunglasses on radiant days. Stay aware! UV radiation is magnified when reflecting off sand and water.
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Frequently asked questions

Is it hot in Rio das Ostras during January?

The high-temperature, in January, in Rio das Ostras, is 28.8°C (83.8°F), while the low-temperature averages to 23.1°C (73.6°F). The average heat index (a.k.a. 'apparent temperature', 'real feel'), which represents the influence of relative humidity on air temperature, in January is evaluated at 35°C (95°F).

What is the average humidity in January in Rio das Ostras?

The average relative humidity in January in Rio das Ostras, Brazil, is 82%.

How many days does it rain in January in Rio das Ostras?

In Rio das Ostras, Brazil, in January, it is raining for 19.2 days, with typically 84mm (3.31") of accumulated precipitation.

What is the water temperature in January in Rio das Ostras?

In Rio das Ostras, the average seawater temperature in January is 24.5°C (76.1°F). A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 24.5°C (76.1°F) water.

How many hours of daylight does Rio das Ostras have in January?

In January, the average day length is 13h and 20min.

When are sunrise and sunset in January in Rio das Ostras?

In January, on the first day of the month, sunrise is at 05:06 and sunset at 18:35. On the last day of the month, sunrise is at 05:27 and sunset at 18:34 -03.

How long on average sun shines in January in Rio das Ostras?

In January, the average sunshine duration in Rio das Ostras is 8.8h.

When is the highest UV index in Rio das Ostras?

With an average maximum UV index of 7, January is the month with the highest UV index in Rio das Ostras, Brazil.

What is the UV index intensity in January in Rio das Ostras?

In Rio das Ostras, the average daily maximum UV index in January is 7. A UV Index value of 6 to 7 symbolizes a high hazard to health from exposure to Sun's UV rays.

Average temperature in January
Rio das Ostras, Brazil

Average temperature in January - Rio das Ostras, Brazil
  • Average high temperature in January: 28.8°C

The warmest month (with the highest average high temperature) is February (29.1°C).
The month with the lowest average high temperature is June (24.1°C).

  • Average low temperature in January: 23.1°C

The month with the highest average low temperature is January (23.1°C).
The coldest month (with the lowest average low temperature) is August (18.3°C).

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Average pressure in January
Rio das Ostras, Brazil

Average pressure in January - Rio das Ostras, Brazil
  • Average pressure in January: 1012.9mbar

The month with the highest atmospheric pressure is July (1020.7mbar).
The month with the lowest atmospheric pressure is December (1012mbar).

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Average wind speed in January
Rio das Ostras, Brazil

Average wind speed in January - Rio das Ostras, Brazil
  • Average wind speed in January: 13.7km/h

The windiest month (with the highest average wind speed) is September (15.8km/h).
The calmest month (with the lowest average wind speed) is March (10.9km/h).

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Average humidity in January
Rio das Ostras, Brazil

Average humidity in January - Rio das Ostras, Brazil
  • Average humidity in January: 82%

The months with the highest relative humidity are November and December (84%).
The months with the lowest relative humidity are August and September (78%).

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Average rainfall in January
Rio das Ostras, Brazil

Average rainfall in January - Rio das Ostras, Brazil
  • Average rainfall in January: 84mm

The wettest month (with the highest rainfall) is November (108mm).
The driest month (with the least rainfall) is June (18mm).

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Average rainfall days in January
Rio das Ostras, Brazil

Average rainfall days in January - Rio das Ostras, Brazil
  • Average rainfall days in January: 19.2 days

The month with the highest number of rainy days is March (21.7 days).
The month with the least rainy days is August (8.9 days).

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Average sea temperature in January
Rio das Ostras, Brazil

Average sea temperature in January - Rio das Ostras, Brazil
  • Average sea temperature in January: 24.5°C

The best month for swimming (with the highest average sea temperature) is March (25.8°C).
The coldest month (with the lowest average sea temperature) is September (21.9°C).

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Average daylight in January /
Average sunshine in January
Rio das Ostras, Brazil

Average daylight in January / Average sunshine in January - Rio das Ostras, Brazil
  • Average daylight in January: 13h and 2min

The month with the longest days is December (Average daylight: 13h and 30min).
The month with the shortest days is June (Average daylight: 10h and 48min).

  • Average sunshine in January: 8h and 5min

The month with the most sunshine is February (Average sunshine: 9h and 0min).
The month with the least sunshine is October (Average sunshine: 7h and 36min).

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Average sunshine days in January
Rio das Ostras, Brazil

Average sunshine days in January - Rio das Ostras, Brazil
  • Average sunshine days in January: 7.3 days

The month with the most sunshine days is August (19.5 days).
The months with the least sunshine days are March and December (5.8 days).

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Average UV index in January
Rio das Ostras, Brazil

Average UV index in January - Rio das Ostras, Brazil
  • Average UV index in January: 7

The month with the highest UV index is January (UV index 7).
The months with the lowest UV index are July and September (UV index 5).

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Average cloud cover in January
Rio das Ostras, Brazil

Average cloud cover in January - Rio das Ostras, Brazil
  • Average cloud cover in January: 31

The month with the most cloud cover is November (Cloud cover 48).
The months with the least cloud cover are February, June and July (Cloud cover 27).

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Average visibility in January
Rio das Ostras, Brazil

Average visibility in January - Rio das Ostras, Brazil
  • Average visibility in January: 10km

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October and December (10km).
The month with the lowest visibility is November (9km).

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Rio das Ostras, Brazil

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