Planning a trip to San Diego in January? You are in luck! The weather is generally good, with an average maximum temperature of +64°F and approximately 8 sunny days. Just be prepared for some rain, as there are usually around 10 rainy days and 69 mm of precipitation. Expect good weather and pack accordingly to enjoy the outdoors. Search flightsin one click on Avionero.
Good to know:
January is usually the coldest month of the year in San Diego;
Average weather
☀️
+64°F
Avg. max. temperature
+37°F
Min.
+86°F
Max.
69 mm
Total precipitation
68%
Avg. humidity
2 m/s
Avg. wind
8 ☀️
Sunny Days
13 ⛅️
Cloudy
10 🌦
Rainy
Our opinion: San Diego has good weather in January.
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Average temperature in San Diego in January
Here are the expected maximum, average and minimum temperatures in San Diego for January based on the historical data.
Last Year
Historical Data
Going from a maximum of +72°F during the day to a minimum of +41°F during the night, the temperature in January averages around +63°F.
The average maximum temperature goes up 6% by the end of the month, compared with the beginning of the month, from +59°F to +61°F.
Is San Diego warm or cold in January?
San Diego is typically mild in January.
Maximum temperatures go up compared to the previous month from +64°F to +64°F. The minimum temperature also goes up from +50°F to +50°F.
Pack a light jacket as it will be warm in the day and cool in the evenings.
January is the coldest month in San Diego, here is the comparison with other months:
Water temperature in San Diego in January
Water in San Diego in January is Cold. It varies from +57°F to +61°F, with an average of +59°F.This is almost similar to the air temperature, which averages +64°F.
The water temperature in January is one of the coldest of the entire year:
The warmest water temperatures in San Diego are reached in August, when the average sea temperature rises to +68°F. The coldest water temperatures are in February, with an average of +59°F.
Can you swim in San Diego in January?
We would not recommend swimming in San Diego in January, the water is very cold (+59°F on average). Consider swimming only if you are an experienced cold-water swimmer with proper gear.
🦭
Cold
Below +61°F
🏄♂️
Fresh
61°F - 70°F
🏊
Comfortable
70°F - 77°F
👙
Warm
77°F - 82°F
🔥
Very warm
+82°C and up
You will need a full-body wetsuit, cap, gloves, a warm change of clothes, and a hot drink ready for after your swim.
Climate in San Diego in January
San Diego weather looks like this, on average, in January and the surrounding months.
December
January
February
Avg. temperature
+64°F
+64°F
+64°F
Min. temperature
+37°F
+37°F
+37°F
Max. temperature
+81°F
+86°F
+86°F
Rainfall
53 mm
69 mm
84 mm
Wind
2 m/s
2 m/s
2 m/s
Avg. water temperature
+61°F
+59°F
+59°F
Humidity
67%
68%
68%
Air pressure
1017 HPa
1018 HPa
1017 HPa
Sunny days
10
8
7
Cloudy days
12
13
11
Rainy days
9
10
10
Snowy days
0
0
0
January weather is still as good as in December.The temperature levels stay the same in the area of +64°F for average maximum temperature during the day.Prepare for more rain. Average rainfall goes from 53 mm to 69 mm.Humidity rises from 67% to 68%.The average wind speed doesn’t change much during January, staying around 2 m/s.The days becoming less sunny, going from 10 sunny days in December to 8 in January.
February brings much the same weather, it remains good.
Wind speed in San Diego in January based on historical data.
Last Year
Historical Data
The average wind speed is 3 m/s getting up to 8 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in San Diego is gradually decreasing during January, going from 8 m/s to 3 m/s over the course of the month.
Rain
Amount of rainfall in mm during January in San Diego based on historical data.
Last Year
Historical Data
Typically, there is a 48% chance of rain on an average day in January, with total rainfall of approximately 192 mm. The maximum amount of rainfall per day is around 47 mm, which is moderate rain.January is a pretty wet month with over 15 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of wellies.
January is one of the rainiest months in San Diego, here is a comparison with other months, total mm:
San Diego wettest month is February, where a typical day has a 34% chance of precipitation and 84 mm of rainfall per day. July, on the other hand, is the driest month with a mere 6% chance of precipitation and 2 mm of rainfall per day.
How was the weather last January in San Diego?
This is the weather in San Diego in January 2023:
1 January
🌧️
+59°F
2 January
🌧️
+59°F
3 January
🌧️
+58°F
4 January
🌧️
+64°F
5 January
🌧️
+61°F
6 January
🌫️
+61°F
7 January
🌫️
+65°F
8 January
☀️
+64°F
9 January
☁️
+64°F
10 January
🌧️
+61°F
11 January
🌧️
+61°F
12 January
☀️
+71°F
13 January
☁️
+69°F
14 January
🌫️
+61°F
15 January
🌧️
+61°F
16 January
🌧️
+59°F
17 January
🌧️
+57°F
18 January
☁️
+59°F
19 January
☁️
+58°F
20 January
☀️
+59°F
21 January
☀️
+61°F
22 January
☀️
+59°F
23 January
☀️
+62°F
24 January
☀️
+64°F
25 January
☀️
+65°F
26 January
☀️
+69°F
27 January
☀️
+68°F
28 January
☁️
+63°F
29 January
☁️
+58°F
30 January
🌧️
+56°F
31 January
🌧️
+60°F
In January 2023 San Diego had 10 sunny days, 6 cloudy days, and 12 rainy days. The average maximum temperature was +63°F, with an absolute maximum of +72°F and a minimum of +55°F. The average humidity was 73%, with a maximum of 96% and a minimum of 17%. The average wind speed was 3 m/s, with a maximum of 12 m/s and a minimum of 0 m/s.
Are you planning a trip in January?
Climate Change Over the Years
This is how San Diego climate has changed over the last 43 years.
The climate in San Diego in January has not changed that much over the last 43 years.
The average temperature was the lowest in 2001 (+67°F) and the highest in 2014 (+74°F). The driest year was 2002 with only 156 mm of rainfall, and the wettest year was 2023 with 1311 mm.
FAQ
Frequently asked questions about the weather in San Diego in January:
Is January a good time to visit San Diego?
January is a really good time to go to San Diego. The weather is nice so plan your packing around outdoor activities and exploring. Check out other good time to visit San Diego.
Can you sunbathe in San Diego in January?
January has mild temperatures in San Diego. Not ideal for sunbathing, but still good for daytime outdoor activities, but plan for cool evenings. Pack a light jacket and shorts!
Can you swim in San Diego in January?
Swimming in San Diego in January is challenging and not recommended for inexperienced swimmers or without proper equipment and preparation.
Is San Diego rainy in January?
San Diego is often rainy in January. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.
Is it sunny in San Diego in January?
Usually, it’s not very sunny in San Diego in January, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.
For this page, we’ve looked at the typical weather in San Diego, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
