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January Weather in San Luis, United States

Last updated: June 24, 2025

In San Luis, United States, the average temperature in January hovers around -5°C (23°F). While you may experience frigid lows of -23°C (-9°F), there can also be occasional highs reaching up to 13°C (55°F). Expect 23 mm (0.9 in) of precipitation spread over about 6 days, contributing to a notably high average humidity of 84%.

January Temperature in San Luis

In January in San Luis, the average temperature is -5°C (23°F), with maximums reaching 13°C (55°F) and minimums dropping as low as -23°C (-9°F). Be prepared for chilly weather and dress warmly if you're planning to travel during this time.

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

The chart illustrates January temperature patterns in San Luis, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Luis, January typically has an average temperature of -5°C (23°F), with highs reaching up to 13°C (55°F) and lows dropping to around -23°C (-9°F).
JanFebMarAprMayJunJulAugSepOctNovDec222534415161646357453525
Data source: Temperature data for San Luis 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 Luis

In San Luis in January, the precipitation amount is 23 mm (0.9 in) spread over 6 days.

January Precipitation Trends in San Luis

The chart displays monthly precipitation patterns in San Luis, 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 Luis, January typically receives around 23 mm (0.9 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec232537354228714531271723
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in San Luis

In San Luis in January, humidity is 84%. With an average temperature of -5°C (23°F), this humidity feels like an icy blanket wrapping around you, making the cold air bite even deeper and turning travel into a brisk, challenging adventure where each breath comes with a frosty reminder of the chill.

January Average Humidity in San Luis

This chart illustrates the average monthly humidity levels in San Luis, 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 Luis is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%84%75%68%62%55%54%61%70%78%81%85%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in San Luis

In San Luis in January, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in San Luis for better planning.

Maximum UV Index Levels in San Luis for January

The chart shows the monthly maximum UV Index (UVI) for San Luis 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 Luis typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec4710111213131211854
Data source: San Luis 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 Luis Compares to Other Months

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

This table compares monthly weather conditions in San Luis, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)23 mm (0.9 inches)84%moderate
February Weather-4°C (25°F)25 mm (1.0 inches)84%high
March Weather1°C (34°F)37 mm (1.5 inches)74%very high
April Weather5°C (42°F)35 mm (1.4 inches)68%extreme
May Weather10°C (51°F)42 mm (1.6 inches)62%extreme
June Weather16°C (62°F)28 mm (1.1 inches)55%extreme
July Weather18°C (65°F)71 mm (2.8 inches)54%extreme
August Weather17°C (63°F)45 mm (1.8 inches)61%extreme
September Weather14°C (57°F)31 mm (1.2 inches)70%extreme
October Weather7°C (45°F)27 mm (1.1 inches)78%very high
November Weather2°C (35°F)17 mm (0.7 inches)81%moderate
December Weather-4°C (25°F)23 mm (0.9 inches)85%moderate

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