January weather forecast and climate
Gilroy, CA

A colorful sunset sky over the hilly region of Gilroy in California
A colorful sunset sky over the hilly region of Gilroy in California

Weather in January

January, the same as December, in Gilroy, California, is a moderate winter month, with temperature in the range of an average low of 41.4°F (5.2°C) and an average high of 59.5°F (15.3°C).

Temperature

In Gilroy, the average high-temperature is practically the same as in December - a still mild 59.5°F (15.3°C). In January, the average low-temperature is 41.4°F (5.2°C).

Humidity

In January, the average relative humidity is 72%.

Rainfall

In January, in Gilroy, California, the rain falls for 5.5 days. Throughout January, 0.55" (14mm) of precipitation is accumulated. Throughout the year, in Gilroy, there are 43.4 rainfall days, and 3.66" (93mm) of precipitation is accumulated.

Daylight

In Gilroy, the average length of the day is 10h.

Sunshine

In Gilroy, California, the average sunshine is 6.4h.

UV index

January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index in Gilroy. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to the Sun's UV rays for average individuals.
Note: In January, the average maximum UV index of 3 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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.
[Resources]

FAQ

What is the temperature in January in Gilroy?

In Gilroy, California, in January, the average high-temperature is 59.5°F (15.3°C), and the average low-temperature is 41.4°F (5.2°C).

What is the average humidity in January in Gilroy?

The average relative humidity in January in Gilroy is 72%.

How much does it rain in Gilroy in January?

In January, in Gilroy, California, the rain falls for 5.5 days. Throughout January, 0.55" (14mm) of precipitation is accumulated.

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

In Gilroy, California, the average length of the day in January is 10h.

How many hours of sunshine does Gilroy have in January?

The average sunshine in January is 6.4h.

When is the lowest UV index in Gilroy?

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

What is the UV index intensity in January in Gilroy?

In Gilroy, the average daily maximum UV index in January is 3. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from the exposure to the Sun's UV rays.

Average temperature in January
Gilroy, CA

Average temperature in January - Gilroy, CA
  • Average high temperature in January: 59.5°F

The warmest month (with the highest average high temperature) is August (85.1°F).
The month with the lowest average high temperature is December (57.6°F).

  • Average low temperature in January: 41.4°F

Months with the highest average low temperature are August and September (54.1°F).
The coldest months (with the lowest average low temperature) are February and March (40.6°F).

[Resources]

Average pressure in January
Gilroy, CA

Average pressure in January - Gilroy, 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").

[Resources]

Average wind speed in January
Gilroy, CA

Average wind speed in January - Gilroy, CA
  • Average wind speed in January: 4mph

The windiest month (with the highest average wind speed) is May (5.3mph).
The calmest month (with the lowest average wind speed) is November (3.9mph).

[Resources]

Average humidity in January
Gilroy, CA

Average humidity in January - Gilroy, 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 (57%).

[Resources]

Average rainfall in January
Gilroy, CA

Average rainfall in January - Gilroy, CA
  • Average rainfall in January: 0.55"

The wettest month (with the highest rainfall) is December (0.83").
The driest months (with the least rainfall) are June, July and August (0").

[Resources]

Average rainfall days in January
Gilroy, CA

Average rainfall days in January - Gilroy, CA
  • Average rainfall days in January: 5.5 days

The month with the highest number of rainy days is March (8.3 days).
The month with the least rainy days is August (0.6 days).

[Resources]

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

Average daylight in January / Average sunshine in January - Gilroy, CA
  • Average daylight in January: 10h

The month with the longest days is June (Average daylight: 14.7h).
The month with the shortest days is December (Average daylight: 9.7h).

  • Average sunshine in January: 6.4h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 6h).

[Resources]

Average sunshine days in January
Gilroy, CA

Average sunshine days in January - Gilroy, CA
  • Average sunshine days in January: 24.2 days

The month with the most sunshine days is July (29.9 days).
The month with the least sunshine days is March (21.4 days).

[Resources]

Average UV index in January
Gilroy, CA

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

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

[Resources]

Average cloud cover in January
Gilroy, CA

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

The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 7).

[Resources]

Average visibility in January
Gilroy, CA

Average visibility in January - Gilroy, 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).

[Resources]