Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
With average high temperatures of 60.3°F (15.7°C) and lows of 46.2°F (7.9°C), December is the coldest month.Humidity
In December, the average relative humidity is 64%.Rainfall
In Port San Luis, in December, it is raining for 7.7 days, with typically 1.46" (37mm) of accumulated precipitation. In Port San Luis, during the entire year, the rain falls for 57 days and collects up to 9.57" (243mm) of precipitation.Daylight
With an average of 9h and 48min of daylight, December has the shortest days of the year in Port San Luis.On the first day of December, sunrise is at 6:53 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:11 am and sunset at 5:01 pm PST.
Sunshine
February and December, with an average of 6.5h of sunshine, are months with the least sunshine in Port San Luis, California.UV index
The average daily maximum UV index in December in Port San Luis is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: The maximum UV index of 4 during December translates into these guidelines:
Exercise prevention - Protecting skin and eyes from harm is required. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Frequently asked questions
What are the coldest months in Port San Luis?
What is the average December temperature in Port San Luis?
What is the average humidity in December in Port San Luis?
How many days does it rain in December in Port San Luis?
What is the month with the shortest days in Port San Luis?
What is the average length of the day in December in Port San Luis?
When is the sunrise / sunset in December in Port San Luis?
What are the months with the least sunshine in Port San Luis?
How many hours of sunshine does Port San Luis have in December?
How high is the UV index in December in Port San Luis?
Average temperature in December
Port San Luis, CA
- Average high temperature in December: 60.3°F
The warmest month (with the highest average high temperature) is August (80.2°F).
The month with the lowest average high temperature is December (60.3°F).
- Average low temperature in December: 46.2°F
The month with the highest average low temperature is September (60.3°F).
The coldest month (with the lowest average low temperature) is February (45.7°F).
Average pressure in December
Port San Luis, CA
- Average pressure in December: 30.09"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 December
Port San Luis, CA
- Average wind speed in December: 6.2mph
The windiest months (with the highest average wind speed) are April and May (6.8mph).
The calmest months (with the lowest average wind speed) are August and September (5.3mph).
Average humidity in December
Port San Luis, CA
- Average humidity in December: 64%
The month with the highest relative humidity is March (69%).
The months with the lowest relative humidity are September and October (57%).
Average rainfall in December
Port San Luis, CA
- Average rainfall in December: 1.46"
The wettest month (with the highest rainfall) is March (2.01").
The driest months (with the least rainfall) are June and August (0.04").
Average rainfall days in December
Port San Luis, CA
- Average rainfall days in December: 7.7 days
The month with the highest number of rainy days is March (10.5 days).
The month with the least rainy days is August (0.6 days).
Average daylight in December /
Average sunshine in December
Port San Luis, CA
- Average daylight in December: 9h and 5min
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 December: 6h and 3min
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 December
Port San Luis, CA
- Average sunshine days in December: 22.2 days
The month with the most sunshine days is August (29.2 days).
The month with the least sunshine days is February (19.1 days).
Average UV index in December
Port San Luis, CA
- Average UV index in December: 4
The months with the highest UV index are June and August (UV index 6).
The month with the lowest UV index is February (UV index 3).
Average cloud cover in December
Port San Luis, CA
- Average cloud cover in December: 25
The month with the most cloud cover is March (Cloud cover 28).
The months with the least cloud cover are August and September (Cloud cover 6).
Average visibility in December
Port San Luis, CA
- Average visibility in December: 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).
Port San Luis, California, USA
Weather forecast for your location
2. Allow the app to use your location
