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 sea temperature 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
With the onset of January, the average high-temperature registers at a still moderate 56.8°F (13.8°C), subtly different from December's 55.9°F (13.3°C). Nighttime temperatures in January average to a chilly 46.4°F (8°C).Humidity
In January, the average relative humidity is 73%.Rainfall
In Redwood City, during January, the rain falls for 10.1 days and regularly aggregates up to 1.93" (49mm) of precipitation. Throughout the year, there are 73.4 rainfall days, and 11.89" (302mm) of precipitation is accumulated.Ocean temperature
In Redwood City, California, the average seawater temperature in January is 54.1°F (12.3°C).Note: While a brief time in 54.1°F (12.3°C) at 55.4°F (13°C) is already bracing, plunging below 50°F (10°C) can severely affect breathing and introduce a cold shock, relying on your physical state.
Daylight
The average length of the day in January in Redwood City is 9h and 56min.On the first day of January in Redwood City, sunrise is at 7:23 am and sunset at 5:01 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 5:31 pm PST.
Sunshine
In Redwood City, California, the average sunshine in January is 6.2h.UV index
In Redwood City, the average daily maximum UV index in January is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.Note: The UV index of 4 during January leads to these advisories:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.
Frequently asked questions
What are the temperatures in Redwood City in January?
What is the average humidity in January in Redwood City?
How much does it rain in Redwood City in January?
What is the water temperature in January in Redwood City?
How many hours of daylight does Redwood City have in January?
When is the sunrise / sunset in January in Redwood City?
How long on average sun shines in January in Redwood City?
How high is the UV index in January in Redwood City?
Average temperature in January
Redwood City, CA
- Average high temperature in January: 56.8°F
The warmest months (with the highest average high temperature) are July and August (73°F).
The month with the lowest average high temperature is December (55.9°F).
- Average low temperature in January: 46.4°F
The month with the highest average low temperature is September (56.7°F).
The coldest month (with the lowest average low temperature) is February (46°F).
Average pressure in January
Redwood City, 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
Redwood City, CA
- Average wind speed in January: 5.8mph
The windiest month (with the highest average wind speed) is April (7.5mph).
The calmest months (with the lowest average wind speed) are August, September and October (5.5mph).
Average humidity in January
Redwood City, CA
- Average humidity in January: 73%
The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is October (68%).
Average rainfall in January
Redwood City, CA
- Average rainfall in January: 1.93"
The wettest month (with the highest rainfall) is February (2.36").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in January
Redwood City, CA
- Average rainfall days in January: 10.1 days
The month with the highest number of rainy days is March (12.8 days).
The month with the least rainy days is August (0.8 days).
Average sea temperature in January
Redwood City, CA
- Average sea temperature in January: 54.1°F
The best months for swimming (with the highest average sea temperature) are August and September (57.7°F).
The coldest month (with the lowest average sea temperature) is April (53.4°F).
Average daylight in January /
Average sunshine in January
Redwood City, 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 1min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in January
Redwood City, CA
- Average sunshine days in January: 19.8 days
The month with the most sunshine days is August (27.6 days).
The month with the least sunshine days is March (17.5 days).
Average UV index in January
Redwood City, 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 November and December (UV index 3).
Average cloud cover in January
Redwood City, CA
- Average cloud cover in January: 32
The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility in January
Redwood City, 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).
Redwood City, California, USA
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