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
Upon the onset of January, San Bruno witnesses an average high-temperature of a still mild 56.3°F (13.5°C), showing a close resemblance to the prior month. In San Bruno, January is characterized by an average low-temperature of 47.8°F (8.8°C), indicating a minor drop from daytime highs.Humidity
The average relative humidity in January in San Bruno is 73%.Rainfall
In San Bruno, during January, the rain falls for 10.8 days and regularly aggregates up to 2.2" (56mm) of precipitation. In San Bruno, during the entire year, the rain falls for 81.8 days and collects up to 13.46" (342mm) of precipitation.Daylight
The average length of the day in January in San Bruno is 9h and 55min.On the first day of the month, sunrise is at 7:24 am and sunset at 5:01 pm. On the last day of January, sunrise is at 7:14 am and sunset at 5:31 pm PST.
Sunshine
The average sunshine in January is 6h.UV index
In San Bruno, the average daily maximum UV index in January is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for average individuals.Note: In January, the UV index of 4 transforms into the following advice:
Undertake protective steps - Recommendations to avoid sunburn are issued. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.
Frequently asked questions
What is the usual temperature for San Bruno in January?
What is the average humidity in January in San Bruno?
How many days does it rain in January in San Bruno?
What is the average length of the day in January in San Bruno?
When are sunrise and sunset in January in San Bruno?
How many hours of sunshine does San Bruno have in January?
What is the UV index intensity in January in San Bruno?
Average temperature in January
San Bruno, CA
- Average high temperature in January: 56.3°F
The warmest month (with the highest average high temperature) is September (69.8°F).
The month with the lowest average high temperature is December (55.8°F).
- Average low temperature in January: 47.8°F
The month with the highest average low temperature is September (56.5°F).
The coldest month (with the lowest average low temperature) is December (47.7°F).
Average pressure in January
San Bruno, CA
- Average pressure in January: 30.13"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is September (29.92"Hg).
Average wind speed in January
San Bruno, CA
- Average wind speed in January: 6.7mph
The windiest month (with the highest average wind speed) is April (8.5mph).
The calmest months (with the lowest average wind speed) are August and September (6.3mph).
Average humidity in January
San Bruno, CA
- Average humidity in January: 73%
The month with the highest relative humidity is August (79%).
The months with the lowest relative humidity are October and November (71%).
Average rainfall in January
San Bruno, CA
- Average rainfall in January: 2.2"
The wettest month (with the highest rainfall) is February (2.72").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in January
San Bruno, CA
- Average rainfall days in January: 10.8 days
The month with the highest number of rainy days is March (13.3 days).
The months with the least rainy days are July and August (2.2 days).
Average daylight in January /
Average sunshine in January
San Bruno, CA
- Average daylight in January: 9h and 5min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in January: 6h and 0min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in January
San Bruno, CA
- Average sunshine days in January: 19.8 days
The month with the most sunshine days is July (27.3 days).
The month with the least sunshine days is March (16.3 days).
Average UV index in January
San Bruno, CA
- Average UV index in January: 4
The months with the highest UV index are June, July, August and September (UV index 5).
The months with the lowest UV index are February, November and December (UV index 3).
Average cloud cover in January
San Bruno, CA
- Average cloud cover in January: 34
The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is September (Cloud cover 16).
Average visibility in January
San Bruno, 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 Bruno, California, USA
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