January weather forecast
São Paulo, Brazil

January in São Paulo, Brazil ushers in the year with noticeable humidity. It is among the hotter months with temperatures peaking at 27.3°C (81.1°F), coupled with an extended daylight period of 13.4 hours. The city encounters an average of 15 days of rain, with precipitation reaching a significant average total of 237mm (9.33"). Residents often find relief from the tropical temperatures in the form of these regular showers. These weather conditions set the tone for Brazil's samba-filled summer in São Paulo.

Temperature

January's onset records an average high-temperature of a still warm 27.3°C (81.1°F), a near match to December's 26.3°C (79.3°F). An average low-temperature of 18.7°C (65.7°F) is observed during the January nights.

Heat index

In January, the heat index is appraised at a hot 30°C (86°F). If one stays active during extended exposure, it might induce fatigue and result in heat cramps.
Thinking about the heat index, one should account for its values in shaded areas with gentle breezes. A rise of up to 15 Fahrenheit (8 Celsius) degrees in the heat index could result from direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is found by incorporating humidity levels into the air temperature measurement. Factors encompassing physical activity, clothing, and metabolic differences have a role in shaping the individual's impression of temperature. With the sun shining directly, it's crucial to understand that it can increase the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it's vital to remain hydrated, particularly during prolonged physical activities.

Humidity

January, March, April and December, with an average relative humidity of 80%, are the most humid months.

Rainfall

January is the month with the most rainfall. Rain falls for 15 days and accumulates 237mm (9.33") of precipitation.

Daylight

The average length of the day in January is 13h and 23min.
On the first day of January in São Paulo, sunrise is at 05:23 and sunset at 18:56. On the last day of the month, sunrise is at 05:44 and sunset at 18:55 -03.

Sunshine

In São Paulo, the average sunshine in January is 5.5h.

UV index

The months with the highest UV index in São Paulo are January through March, November and December, with an average maximum UV index of 12. A UV Index value of 11, and more, symbolizes an extreme health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In January, a daily UV index of 12 turns into the following recommendations:
Adopt all essential precautions. Preventing sun harm is crucial. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Using sunscreen with 30 SPF or more is key to avoiding sunburn and minimizing the Sun's radiation impact on health.