Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
January's climate shows a minor adjustment in average high-temperatures to a still warm 28°C (82.4°F) from December's 27.5°C (81.5°F). Porto Alegre, during January nights, witnesses an average temperature marginally cooler than its daytime highs, at a still warm 27°C (80.6°F).Heat index
The heat index value during January is appraised at a hot 32°C (89.6°F). Long-lasting exposure and activity potentially induce a sense of weariness, with the risk of heat cramps.Records show heat index calculations are tailored for shaded regions and mild winds. Being under direct sunlight might amplify the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is a composite of temperature and humidity figures to convey how warm it feels. This effect is personal, shaped by the individual's physical activity and heat sensitivity, influenced by factors including wind, clothing, and metabolic variances. 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 hold particular significance for children. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.
Humidity
In January, the average relative humidity in Porto Alegre, São Tomé and Príncipe, is 77%.Rainfall
In Porto Alegre, during January, the rain falls for 27.1 days and regularly aggregates up to 130mm (5.12") of precipitation. In Porto Alegre, São Tomé and Príncipe, during the entire year, the rain falls for 241.7 days and collects up to 1287mm (50.67") of precipitation.Daylight
In Porto Alegre, the average length of the day in January is 12h and 7min.On the first day of January, sunrise is at 05:33 and sunset at 17:40. On the last day of the month, sunrise is at 05:43 and sunset at 17:50 GMT.
Sunshine
In Porto Alegre, the average sunshine in January is 8.3h.UV index
January through May, October through December, with an average maximum UV index of 7, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: A daily maximum UV index of 7 in January translates into the following instructions:
Avoid excessive sunlight. Those with lighter skin may experience burning in less than 20 minutes. The Sun's UV radiation is at its strongest between the hours of 10 a.m. and 4 p.m. Minimize direct exposure to the sun during this period. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.
Frequently asked questions
How hot is January in Porto Alegre?
What is the average humidity in January in Porto Alegre?
How much does it rain in Porto Alegre in January?
What is the average length of the day in January in Porto Alegre?
When is the sunrise / sunset in January in Porto Alegre?
How many hours of sunshine does Porto Alegre have in January?
When is the highest UV index in Porto Alegre?
What is the UV index reading in January in Porto Alegre?
Average temperature in January
Porto Alegre, São Tomé and Príncipe
- Average high temperature in January: 28°C
The warmest month (with the highest average high temperature) is March (28.8°C).
The month with the lowest average high temperature is July (24.5°C).
- Average low temperature in January: 27°C
The month with the highest average low temperature is March (27.5°C).
The coldest month (with the lowest average low temperature) is July (23°C).
Average pressure in January
Porto Alegre, São Tomé and Príncipe
- Average pressure in January: 1010.7mbar
The month with the highest atmospheric pressure is July (1014.3mbar).
The month with the lowest atmospheric pressure is February (1009.8mbar).
Average wind speed in January
Porto Alegre, São Tomé and Príncipe
- Average wind speed in January: 11.1km/h
The windiest month (with the highest average wind speed) is July (17.7km/h).
The calmest month (with the lowest average wind speed) is December (10.8km/h).
Average humidity in January
Porto Alegre, São Tomé and Príncipe
- Average humidity in January: 77%
The months with the highest relative humidity are August, September and October (83%).
The month with the lowest relative humidity is March (76%).
Average rainfall in January
Porto Alegre, São Tomé and Príncipe
- Average rainfall in January: 130mm
The wettest month (with the highest rainfall) is November (224mm).
The driest month (with the least rainfall) is July (9mm).
Average rainfall days in January
Porto Alegre, São Tomé and Príncipe
- Average rainfall days in January: 27.1 days
The month with the highest number of rainy days is December (28.6 days).
The month with the least rainy days is June (7.3 days).
Average daylight in January /
Average sunshine in January
Porto Alegre, São Tomé and Príncipe
- Average daylight in January: 12h and 1min
The month with the longest days is June (Average daylight: 12h and 6min).
The months with the shortest days are March and September (Average daylight: 12h and 6min).
- Average sunshine in January: 8h and 2min
The month with the most sunshine is February (Average sunshine: 8h and 36min).
The month with the least sunshine is August (Average sunshine: 5h and 0min).
Average sunshine days in January
Porto Alegre, São Tomé and Príncipe
- Average sunshine days in January: 3.1 days
The month with the most sunshine days is June (16.4 days).
The month with the least sunshine days is December (1.5 days).
Average UV index in January
Porto Alegre, São Tomé and Príncipe
- Average UV index in January: 7
The months with the highest UV index are January, February, March, April, May, October, November and December (UV index 7).
The month with the lowest UV index is July (UV index 5).
Average cloud cover in January
Porto Alegre, São Tomé and Príncipe
- Average cloud cover in January: 38
The month with the most cloud cover is August (Cloud cover 65).
The month with the least cloud cover is February (Cloud cover 37).
Average visibility in January
Porto Alegre, São Tomé and Príncipe
- Average visibility in January: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September and December (10km).
The months with the lowest visibility are October and November (9km).
Porto Alegre, São Tomé and Príncipe
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