January weather forecast and climate
Hayward, CA

The landscape of the famed Verdant Hills in Hayward, California
The landscape of the famed Verdant Hills in Hayward, California

Weather in January

January, like December, is a moderate winter month in Hayward, California, with average temperature fluctuating between 57°F (13.9°C) and 43.7°F (6.5°C).

Temperature

In Hayward, the average high-temperature is essentially the same as in December - a still mild 57°F (13.9°C). In Hayward, California, in January, the average low-temperature is 43.7°F (6.5°C).

Humidity

In Hayward, California, the average relative humidity is 72%.

Rainfall

In Hayward, in January, it is raining for 9.3 days, with typically 1.89" (48mm) of accumulated precipitation. Throughout the year, in Hayward, California, there are 69.2 rainfall days, and 11.1" (282mm) of precipitation is accumulated.

Daylight

In January, the average length of the day in Hayward is 9.9h.

Sunshine

In Hayward, the average sunshine is 6.3h.

UV index

January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index of 3 to 5 symbolizes a medium vulnerability from the exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 3 interpret into the following advice:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in January in Hayward?

In January, in Hayward, California, the average high-temperature is 57°F (13.9°C), and the average low-temperature is 43.7°F (6.5°C).

What is the average humidity in January in Hayward?

In Hayward, the average relative humidity in January is 72%.

How many days does it rain in January in Hayward?

In Hayward, in January, it is raining for 9.3 days, with typically 1.89" (48mm) of accumulated precipitation.

What is the average length of the day in January in Hayward?

The average length of the day in January in Hayward is 9.9h.

How long on average sun shines in January in Hayward?

In January, the average sunshine is 6.3h.

What are the months with the lowest UV index in Hayward?

January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index in Hayward, California.

How high is the UV index in January in Hayward?

In Hayward, the average daily maximum UV index in January is 3. A UV Index reading of 3 to 5 represents a moderate vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in January
Hayward, CA

Average temperature in January - Hayward, CA
  • Average high temperature in January: 57°F

The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is December (55.9°F).

  • Average low temperature in January: 43.7°F

The month with the highest average low temperature is August (56.5°F).
The coldest months (with the lowest average low temperature) are January and December (43.7°F).

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Average pressure in January
Hayward, CA

Average pressure in January - Hayward, CA
  • Average pressure in January: 30.14"

The month with the highest atmospheric pressure is January (30.14").
Months with the lowest atmospheric pressure are June, August and September (29.92").

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Average wind speed in January
Hayward, CA

Average wind speed in January - Hayward, CA
  • Average wind speed in January: 4.8mph

The windiest month (with the highest average wind speed) is May (6.6mph).
The calmest month (with the lowest average wind speed) is November (4.6mph).

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Average humidity in January
Hayward, CA

Average humidity in January - Hayward, CA
  • Average humidity in January: 72%

The month with the highest relative humidity is March (74%).
The month with the lowest relative humidity is September (61%).

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Average rainfall in January
Hayward, CA

Average rainfall in January - Hayward, CA
  • Average rainfall in January: 1.89"

The wettest month (with the highest rainfall) is February (2.28").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in January
Hayward, CA

Average rainfall days in January - Hayward, CA
  • Average rainfall days in January: 9.3 days

The month with the highest number of rainy days is March (12.4 days).
The month with the least rainy days is August (0.9 days).

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Average daylight in January /
Average sunshine in January
Hayward, CA

Average daylight in January / Average sunshine in January - Hayward, CA
  • Average daylight in January: 9.9h

The month with the longest days is June (Average daylight: 14.7h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in January: 6.3h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 5.9h).

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Average sunshine days in January
Hayward, CA

Average sunshine days in January - Hayward, CA
  • Average sunshine days in January: 20.5 days

The month with the most sunshine days is August (28.9 days).
The month with the least sunshine days is March (17.3 days).

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Average UV index in January
Hayward, CA

Average UV index in January - Hayward, CA
  • Average UV index in January: 3

The month with the highest UV index is June (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in January
Hayward, CA

Average cloud cover in January - Hayward, CA
  • Average cloud cover in January: 31

Months with the most cloud cover are March and December (Cloud cover 34).
The month with the least cloud cover is July (Cloud cover 7).

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Average visibility in January
Hayward, CA

Average visibility in January - Hayward, CA
  • Average visibility in January: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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