January Weather in Hayward, United States

Last updated: June 24, 2025

In January, the average temperature in Hayward, United States hovers around 10°C (50°F). Expect fluctuations, with minimums dipping to -2°C (29°F) and maximums soaring up to 25°C (77°F). The month brings 94 mm (3.7 in) of precipitation spread over 8 days, contributing to an average humidity of 82%. Prepare for a diverse range of weather conditions!

January Temperature in Hayward

In January in Hayward, the average temperature is 10°C (50°F). The maximum can reach 25°C (77°F), while the minimum can drop as low as -2°C (29°F). Be prepared for a range of weather conditions when traveling to Hayward during this time.

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

The chart illustrates January temperature patterns in Hayward, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hayward, January typically has an average temperature of 10°C (50°F), with highs reaching up to 25°C (77°F) and lows dropping to around -2°C (29°F).

Data source: Temperature data for Hayward generated using information from the Copernicus Climate Change Service.

January Precipitation in Hayward

In Hayward in January, the precipitation amount is 94 mm (3.7 in) over the course of 8 days.

January Precipitation Trends in Hayward

The chart displays monthly precipitation patterns in Hayward, 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 Hayward, January typically receives around 94 mm (3.7 inches) of precipitation spread over approximately 8 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

January Humidity in Hayward

In Hayward in January, humidity is 82%. With an average temperature of 10°C (50°F), this humidity feels like a dense, heavy blanket wrapping around you, making every step feel sluggish and the air thick, which can make traveling quite uncomfortable.

January Average Humidity in Hayward

This chart illustrates the average monthly humidity levels in Hayward, 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 Hayward is approximately 82%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Hayward

In Hayward in January, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Hayward, you can check the information here.

Maximum UV Index Levels in Hayward for January

The chart shows the monthly maximum UV Index (UVI) for Hayward 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 Hayward typically reaches 3, which falls under the moderate exposure category.

Data source: Hayward 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 Hayward Compares to Other Months

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

This table compares monthly weather conditions in Hayward, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (50°F)	94 mm (3.7 inches)	82%	moderate
February Weather	11°C (52°F)	89 mm (3.5 inches)	84%	moderate
March Weather	12°C (54°F)	77 mm (3.0 inches)	82%	very high
April Weather	14°C (58°F)	30 mm (1.2 inches)	78%	very high
May Weather	16°C (61°F)	17 mm (0.7 inches)	71%	very high
June Weather	19°C (66°F)	2 mm (0.1 inches)	64%	extreme
July Weather	20°C (68°F)	0 mm (0.0 inches)	58%	extreme
August Weather	20°C (69°F)	0 mm (0.0 inches)	54%	very high
September Weather	20°C (68°F)	2 mm (0.1 inches)	55%	very high
October Weather	17°C (63°F)	22 mm (0.9 inches)	62%	high
November Weather	13°C (55°F)	38 mm (1.5 inches)	78%	moderate
December Weather	10°C (50°F)	76 mm (3.0 inches)	80%	moderate