January weather forecast
Grover Beach, CA

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Weather in January

January, like December, in Grover Beach, California, is another refreshing winter month, with an average temperature fluctuating between 63°F (17.2°C) and 47.5°F (8.6°C).

Temperature

January's arrival registers an average high-temperature of a still enjoyable 63°F (17.2°C), closely aligning with the temperature of the previous month. Grover Beach anticipates an average minimum temperature of 47.5°F (8.6°C) in the month of January.

Humidity

In January, the average relative humidity is 63%.

Rainfall

In Grover Beach, in January, during 5.5 rainfall days, 1.22" (31mm) of precipitation is typically accumulated. In Grover Beach, during the entire year, the rain falls for 47.6 days and collects up to 6.93" (176mm) of precipitation.

Daylight

In Grover Beach, the average length of the day in January is 10h and 7min.
On the first day of January, sunrise is at 7:10 am and sunset at 5:01 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 5:29 pm PST.

Sunshine

In January, the average sunshine is 6.8h.

UV index

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: A maximum high UV index of 4 in January translates into the following recommendations:
Undertake protective steps - Preventing sun damage is advised. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
Updated: Aug 28, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are January temperatures?

An average high-temperature, in January, in Grover Beach, is 63°F (17.2°C) and the average low-temperature is 47.5°F (8.6°C).

What is the average humidity in January?

The average relative humidity in January is 63%.

How much does it rain in January?

In Grover Beach, during January, the rain falls for 5.5 days and regularly aggregates up to 1.22" (31mm) of precipitation.

What is the average length of the day in January?

The average day length in January is 10h and 7min.

When are sunrise and sunset in January?

On the first day of January, sunrise is at 7:10 am and sunset at 5:01 pm. On the last day of the month, sunrise is at 7:02 am and sunset at 5:29 pm PST.

How long on average sun shines in January?

In Grover Beach, the average sunshine duration in January is 6.8h.

When is the lowest UV index?

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 4.

How high is the UV index in January?

The average daily maximum UV index in January is 4. A UV Index of 3 to 5 symbolizes a medium hazard to health from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Grover Beach, CA

Average temperature in January - Grover Beach, CA
  • Average high temperature in January: 63°F

The warmest month (with the highest average high temperature) is September (79.5°F).
The month with the lowest average high temperature is December (61.2°F).

  • Average low temperature in January: 47.5°F

The month with the highest average low temperature is September (59.9°F).
The coldest month (with the lowest average low temperature) is February (46°F).

Average pressure in January
Grover Beach, CA

Average pressure in January - Grover Beach, CA
  • Average pressure in January: 30.12"Hg

The month with the highest atmospheric pressure is January (30.12"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.91"Hg).

Average wind speed in January
Grover Beach, CA

Average wind speed in January - Grover Beach, CA
  • Average wind speed in January: 6.2mph

The windiest months (with the highest average wind speed) are April and May (7.3mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).

Average humidity in January
Grover Beach, CA

Average humidity in January - Grover Beach, CA
  • Average humidity in January: 63%

The month with the highest relative humidity is March (68%).
The month with the lowest relative humidity is October (58%).

Average rainfall in January
Grover Beach, CA

Average rainfall in January - Grover Beach, CA
  • Average rainfall in January: 1.22"

The wettest month (with the highest rainfall) is March (1.61").
The driest months (with the least rainfall) are June and August (0.04").

Average rainfall days in January
Grover Beach, CA

Average rainfall days in January - Grover Beach, CA
  • Average rainfall days in January: 5.5 days

The month with the highest number of rainy days is March (8.4 days).
The month with the least rainy days is August (0.8 days).

Average daylight in January /
Average sunshine in January
Grover Beach, CA

Average daylight in January / Average sunshine in January - Grover Beach, CA
  • Average daylight in January: 10h and 1min

The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).

  • Average sunshine in January: 6h and 5min

The months with the most sunshine are June, July and August (Average sunshine: 12h and 0min).
The months with the least sunshine are February and December (Average sunshine: 6h and 30min).

Average sunshine days in January
Grover Beach, CA

Average sunshine days in January - Grover Beach, CA
  • Average sunshine days in January: 24.3 days

The month with the most sunshine days is August (29.6 days).
The month with the least sunshine days is February (21 days).

Average UV index in January
Grover Beach, CA

Average UV index in January - Grover Beach, CA
  • Average UV index in January: 4

The months with the highest UV index are June and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 4).

Average cloud cover in January
Grover Beach, CA

Average cloud cover in January - Grover Beach, CA
  • Average cloud cover in January: 23

The month with the most cloud cover is March (Cloud cover 27).
The month with the least cloud cover is August (Cloud cover 6).

Average visibility in January
Grover Beach, CA

Average visibility in January - Grover Beach, CA
  • Average visibility in January: 6mi

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

Grover Beach, California, USA

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