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January Weather in San Mateo, Peru

Last updated: August 27, 2025

In January, the average temperature in San Mateo, Peru hovers around 3°C (38°F), with minimums dipping to a chilly -6°C (22°F) and maximums reaching a comfortable 13°C (55°F). Expect moist conditions with 220 mm (8.7 in) of precipitation spread across 25 days, and brace for an average humidity level of 91%. 🌧️

January Temperature in San Mateo

In January in San Mateo, the average temperature is 3°C (38°F). The maximum can reach 13°C (55°F), while the minimum can drop as low as -6°C (22°F). It's advisable to pack warm clothing and be prepared for chilly conditions if you're traveling during this time.

January Weather in San Mateo: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in San Mateo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Mateo, January typically has an average temperature of 3°C (38°F), with highs reaching up to 13°C (55°F) and lows dropping to around -6°C (22°F).
JanFebMarAprMayJunJulAugSepOctNovDec383838383736353637373839
Data source: Temperature data for San Mateo generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

January Precipitation in San Mateo

In San Mateo in January, the precipitation amount is 220 mm (8.7 in) spread over 25 days, indicating a relatively wet period for the area.

January Precipitation Trends in San Mateo

The chart displays monthly precipitation patterns in San Mateo, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In San Mateo, January typically receives around 220 mm (8.7 inches) of precipitation spread over approximately 25 days.
JanFebMarAprMayJunJulAugSepOctNovDec220251291164124504459120174232244
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in San Mateo

In San Mateo in January humidity is 91%. With an average temperature of 3°C (38°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities uncomfortable and necessitating layered clothing to stay warm and dry during your travels.

January Average Humidity in San Mateo

This chart illustrates the average monthly humidity levels in San Mateo, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in San Mateo is approximately 91%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%90%91%89%85%65%47%38%40%56%76%90%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in San Mateo

In San Mateo in January, the maximum UV index reaches 20, which falls under the extreme Exposure Category. This means that the time to burn is just 10 minutes. To stay informed about the hourly UV Index in San Mateo, you can visit Hourly UV Index in San Mateo.

Maximum UV Index Levels in San Mateo for January

The chart shows the monthly maximum UV Index (UVI) for San Mateo in January, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In January, the maximum UV index in San Mateo typically reaches 20, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec201920181413141517182018
Data source: San Mateo January UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How January Weather in San Mateo Compares to Other Months

Weather in San Mateo varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in San Mateo, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in San Mateo, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (38°F)220 mm (8.7 inches)91%extreme
February Weather3°C (39°F)251 mm (9.9 inches)90%extreme
March Weather3°C (38°F)291 mm (11.5 inches)91%extreme
April Weather3°C (38°F)164 mm (6.5 inches)89%extreme
May Weather3°C (37°F)124 mm (4.9 inches)85%extreme
June Weather2°C (36°F)50 mm (2.0 inches)65%extreme
July Weather2°C (35°F)44 mm (1.7 inches)47%extreme
August Weather2°C (36°F)59 mm (2.3 inches)38%extreme
September Weather3°C (37°F)120 mm (4.7 inches)40%extreme
October Weather3°C (38°F)174 mm (6.8 inches)56%extreme
November Weather4°C (39°F)232 mm (9.1 inches)76%extreme
December Weather4°C (39°F)244 mm (9.6 inches)90%extreme

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