January weather forecast
Porto Alegre, Brazil

The Porto Alegre weather in January is characterized by high temperatures and humidity. The city experiences its highest average temperature at 30.3°C (86.5°F) along with moderate rainfall of 56mm (2.2"). Frequent showers mark the beginning of the year, giving the landscape a fresh, vibrant look. Being the month with the longest daylight hours, January is a, perfect time for sightseeing and outdoor activities. The humid climate paired with warm temperatures makes the city an attractive destination for sun-loving tourists.

Temperature

The commencement of January in Porto Alegre introduces an average high-temperature of a hot 30.3°C (86.5°F), closely mirroring the preceding month. Porto Alegre's nights in January cool down to an average low-temperature of 20°C (68°F).

Heat index

January's heat index is calculated to be a very hot 37°C (98.6°F). Ensure extra safety steps, heat exhaustion and heat cramps are likely. Long activity might lead to heatstroke.
It is crucial to understand that heat index figures are for shade and gentle wind conditions. Exposure to the direct sun might augment heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', reflects the blend of air temperature and relative humidity to give a temperature impression. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. Exposure to direct sun rays can influence the heat you feel, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Young children are more at risk than adults since they tend to sweat less. Moreover, their large skin surface in proportion to their small bodies and the high heat production due to their activities contribute to their vulnerability.
To combat high temperatures, the human body perspires and relies on sweat evaporation for cooling. During high air temperature and humidity (high heat index), the process of perspiration is hindered, intensifying the sensation of heat. Heat-related challenges, like dehydration, can be anticipated when body heat isn't managed effectively.

Humidity

The average relative humidity in January is 74%.

Rainfall

In January, the rain falls for 14.6 days. Throughout January, 56mm (2.2") of precipitation is accumulated. In Porto Alegre, during the entire year, the rain falls for 148.3 days and collects up to 805mm (31.69") of precipitation.

Sea temperature

The month with the warmest seawater in Porto Alegre is January, with an average sea temperature of 24.7°C (76.5°F).
Note: Consideration of an individual's cold resistance, combined with conditions like sunshine, wind, and temperature, suggests that swimming in 24.7°C (76.5°F) water can be delightful. (Olympic swimming is usually in 25°C (77°F) to 28°C (82.4°F) water.)

Daylight

In January, the average length of the day in Porto Alegre is 13h and 49min.
On the first day of January, sunrise is at 05:26 and sunset at 19:29. On the last day of the month, sunrise is at 05:52 and sunset at 19:24 -03.

Sunshine

In January, the average sunshine in Porto Alegre is 8.2h.

UV index

The average daily maximum UV index in January is 6. A UV Index reading of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for the average person.
Note: A maximum high daily UV index of 6 during January translates into the following directions:
Elude overexposure. Fair-skinned people could get burnt in less than 20 minutes. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Be alert! The reflection of water and sand augments UV radiation intensity.