January weather forecastUnion City, CA
January
Weather in January
January, like December, is a moderate winter month in Union City, California, with an average temperature fluctuating between 57.6°F (14.2°C) and 44.2°F (6.8°C).Temperature
The average high-temperature in January, at a still refreshing 57.6°F (14.2°C), reveals a modest deviation from December's 56.3°F (13.5°C). Union City's nighttime temperature in January falls to an average of 44.2°F (6.8°C).Humidity
In January, the average relative humidity is 72%.Rainfall
In Union City, during January, the rain falls for 5.4 days and regularly aggregates up to 0.31" (8mm) of precipitation. In Union City, during the entire year, the rain falls for 38 days and collects up to 2.13" (54mm) of precipitation.Daylight
In January, the average length of the day is 9h and 55min.On the first day of January, sunrise is at 7:22 am and sunset at 5:00 pm. On the last day of the month, sunrise is at 7:12 am and sunset at 5:30 pm PST.
Sunshine
In Union City, the average sunshine in January is 6.3h.UV index
January, February, November and December, with an average maximum UV index of 3, 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: The maximum daily UV index of 3 in January interprets into the following recommendations:
Take necessary precautions - Defending against sun damage is advocated. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in January
Union City, CA
- Average high temperature in January: 57.6°F
The warmest months (with the highest average high temperature) are July and August (80.1°F).
The month with the lowest average high temperature is December (56.3°F).
- Average low temperature in January: 44.2°F
The months with the highest average low temperature are August and September (56.7°F).
The coldest month (with the lowest average low temperature) is December (43.7°F).
Average pressure in January
Union City, CA
- Average pressure in January: 30.13"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).
Average wind speed in January
Union City, CA
- Average wind speed in January: 4.8mph
The windiest month (with the highest average wind speed) is May (6.4mph).
The calmest months (with the lowest average wind speed) are October and November (4.7mph).
Average humidity in January
Union City, CA
- Average humidity in January: 72%
The month with the highest relative humidity is March (73%).
The months with the lowest relative humidity are September and October (62%).
Average rainfall in January
Union City, CA
- Average rainfall in January: 0.31"
The wettest month (with the highest rainfall) is February (0.47").
The driest months (with the least rainfall) are June, July and August (0").
Average rainfall days in January
Union City, CA
- Average rainfall days in January: 5.4 days
The month with the highest number of rainy days is March (7.3 days).
The month with the least rainy days is July (0.3 days).
Average daylight in January /
Average sunshine in January
Union City, CA
- Average daylight in January: 9h and 54min
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 18min
The month with the most sunshine is July (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).
Average sunshine days in January
Union City, CA
- Average sunshine days in January: 24.8 days
The months with the most sunshine days are July and August (30.4 days).
The month with the least sunshine days is February (22.2 days).
Average UV index in January
Union City, CA
- Average UV index in January: 3
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in January
Union City, CA
- Average cloud cover in January: 30
The month with the most cloud cover is March (Cloud cover 34).
The month with the least cloud cover is July (Cloud cover 6).
Average visibility in January
Union 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).
