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January Weather in Sunnyside, United States

Last updated: June 24, 2025

In January, the average temperature in Sunnyside, United States hovers around 12°C (53°F). However, be prepared for a temperature range that can drop to a chilly -6°C (21°F) or rise to a warm 28°C (83°F). The area experiences about 58 mm (2.3 in) of precipitation over 7 days, contributing to a cozy average humidity of 84%.

January Temperature in Sunnyside

In January in Sunnyside, the average temperature is 12°C (53°F), with maximums reaching 28°C (83°F) and minimums dipping as low as -6°C (21°F). This variation makes it essential to pack layers for your travels in order to stay comfortable throughout the day.

January Weather in Sunnyside: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Sunnyside, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sunnyside, January typically has an average temperature of 12°C (53°F), with highs reaching up to 28°C (83°F) and lows dropping to around -6°C (21°F).
JanFebMarAprMayJunJulAugSepOctNovDec535963687579828179736055
Data source: Temperature data for Sunnyside 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 Sunnyside

In Sunnyside in January, the precipitation amount is 58 mm (2.3 in) over the course of 7 days.

January Precipitation Trends in Sunnyside

The chart displays monthly precipitation patterns in Sunnyside, 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 Sunnyside, January typically receives around 58 mm (2.3 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec58765874731271451321166159121
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Sunnyside

In Sunnyside in January, humidity is 84%. With an average temperature of 12°C (53°F), this humidity feels like a damp chill that clings to your skin, making travel a bit uncomfortable as you navigate through the heavy, moist air.

January Average Humidity in Sunnyside

This chart illustrates the average monthly humidity levels in Sunnyside, 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 Sunnyside is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%79%78%73%72%74%82%82%83%79%82%85%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Sunnyside

In Sunnyside in January, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Sunnyside.

Maximum UV Index Levels in Sunnyside for January

The chart shows the monthly maximum UV Index (UVI) for Sunnyside 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 Sunnyside typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec579101111111110864
Data source: Sunnyside 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 Sunnyside Compares to Other Months

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

This table compares monthly weather conditions in Sunnyside, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather12°C (53°F)58 mm (2.3 inches)84%moderate
February Weather15°C (59°F)76 mm (3.0 inches)79%high
March Weather17°C (63°F)58 mm (2.3 inches)78%very high
April Weather20°C (69°F)74 mm (2.9 inches)72%very high
May Weather24°C (76°F)73 mm (2.9 inches)72%extreme
June Weather26°C (80°F)127 mm (5.0 inches)74%extreme
July Weather28°C (82°F)145 mm (5.7 inches)82%extreme
August Weather27°C (82°F)132 mm (5.2 inches)82%extreme
September Weather26°C (79°F)116 mm (4.6 inches)83%very high
October Weather23°C (73°F)61 mm (2.4 inches)79%very high
November Weather15°C (60°F)59 mm (2.3 inches)82%high
December Weather13°C (56°F)120 mm (4.7 inches)85%moderate

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