Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
January's presence records an average high-temperature of a still refreshing 64.9°F (18.3°C), closely mirroring December's climate. The nights of January anticipate an average low-temperature of 48.7°F (9.3°C).Humidity
In January, the average relative humidity in San Marcos is 58%.Rainfall
In January, in San Marcos, the rain falls for 5 days. Throughout January, 0.59" (15mm) of precipitation is accumulated. In San Marcos, during the entire year, the rain falls for 52.1 days and collects up to 6.1" (155mm) of precipitation.Daylight
In San Marcos, the average length of the day in January is 10h and 16min.On the first day of January in San Marcos, sunrise is at 6:51 am and sunset at 4:52 pm. On the last day of the month, sunrise is at 6:44 am and sunset at 5:19 pm PST.
Sunshine
In January, the average sunshine is 6.9h.UV index
January through March, November and December, with an average maximum UV index of 4, are months with the lowest UV index. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for average individuals.Note: A daily high UV index of 4 in January leads to these guidelines:
Adopt protective measures - It is advised to guard against sun damage. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in January in San Marcos?
What is the average humidity in January in San Marcos?
How many days does it rain in January in San Marcos?
How many hours of daylight does San Marcos have in January?
When is the sunrise / sunset in January in San Marcos?
How long on average sun shines in January in San Marcos?
When is the lowest UV index in San Marcos?
What is the UV index intensity in January in San Marcos?
Average temperature in January
San Marcos, CA
- Average high temperature in January: 64.9°F
The warmest month (with the highest average high temperature) is August (81.9°F).
The months with the lowest average high temperature are February and December (63.3°F).
- Average low temperature in January: 48.7°F
The month with the highest average low temperature is August (64.2°F).
The coldest month (with the lowest average low temperature) is February (48°F).
Average pressure in January
San Marcos, CA
- Average pressure in January: 30.09"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in January
San Marcos, CA
- Average wind speed in January: 5mph
The windiest month (with the highest average wind speed) is April (5.7mph).
The calmest month (with the lowest average wind speed) is October (4.4mph).
Average humidity in January
San Marcos, CA
- Average humidity in January: 58%
The month with the highest relative humidity is May (70%).
The month with the lowest relative humidity is November (56%).
Average rainfall in January
San Marcos, CA
- Average rainfall in January: 0.59"
The wettest month (with the highest rainfall) is December (1.22").
The driest month (with the least rainfall) is June (0.08").
Average rainfall days in January
San Marcos, CA
- Average rainfall days in January: 5 days
The month with the highest number of rainy days is March (7.8 days).
The month with the least rainy days is June (1.2 days).
Average daylight in January /
Average sunshine in January
San Marcos, CA
- Average daylight in January: 10h and 2min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in January: 6h and 5min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 48min).
Average sunshine days in January
San Marcos, CA
- Average sunshine days in January: 25 days
The month with the most sunshine days is August (25.8 days).
The month with the least sunshine days is February (20 days).
Average UV index in January
San Marcos, CA
- Average UV index in January: 4
The months with the highest UV index are June, July, August and September (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
San Marcos, CA
- Average cloud cover in January: 20
The months with the most cloud cover are March and December (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 7).
Average visibility in January
San Marcos, 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).
San Marcos, California, USA
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