If you plan to visit San Jose in December, the weather is typically alright, with an average high temperature of +59°F during the day and approximately 6 sunny days. Expect some rainy, though, as there are typically 13 rainy days in the month and around 108 mm of precipitation. The weather is changeable so you may have to pack for every eventuality. Search flightsin one click on Avionero.
Average weather
☀️
+59°F
Avg. max. temperature
+23°F
Min.
+75°F
Max.
108 mm
Total precipitation
73%
Avg. humidity
2 m/s
Avg. wind
6 ☀️
Sunny Days
12 ⛅️
Cloudy
13 🌦
Rainy
Our opinion: San Jose has OK weather in December.
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Average temperature in San Jose in December
Here are the expected maximum, average and minimum temperatures in San Jose for December based on the historical data.
Last Year
Historical Data
Going from a maximum of +70°F during the day to a minimum of +37°F during the night, the temperature in December averages around +63°F.
The average maximum temperature goes down 6% by the end of the month, compared with the beginning of the month, from +61°F to +59°F.
Is San Jose warm or cold in December?
San Jose is typically mild in December.
Maximum temperatures go down compared to the previous month from +64°F to +59°F. The minimum temperature also goes down from +48°F to +43°F.
Pack a light jacket as it will be warm in the day and cool in the evenings.
December is one of the coolest months in San Jose, here is the comparison with other months:
Climate in San Jose in December
San Jose weather looks like this, on average, in December and the surrounding months.
November
December
January
Avg. temperature
+64°F
+59°F
+59°F
Min. temperature
+34°F
+23°F
+30°F
Max. temperature
+86°F
+75°F
+77°F
Rainfall
64 mm
108 mm
119 mm
Wind
1 m/s
2 m/s
1 m/s
Humidity
70%
73%
75%
Air pressure
1017 HPa
1019 HPa
1019 HPa
Sunny days
8
6
6
Cloudy days
13
12
12
Rainy days
9
13
13
Snowy days
0
0
0
December typically has worse weather conditions compared to November.It’s getting colder in December. From +64°F in the day, the average maximum temperature lowers to +59°F.Prepare for more rain. Average rainfall goes from 64 mm to 108 mm.Humidity rises from 70% to 73%.Winds are stronger in comparison to November, going up from 1 m/s to 2 m/s on average.The days becoming less sunny, going from 8 sunny days in November to 6 in December.
January brings much the same weather, it remains ok.
Wind speed in San Jose in December based on historical data.
Last Year
Historical Data
The average wind speed is 6 m/s getting up to 12 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in San Jose is gradually increasing during December, going from 4 m/s to 10 m/s over the course of the month.
Rain
Amount of rainfall in mm during December in San Jose based on historical data.
Last Year
Historical Data
Typically, there is a 52% chance of rain on an average day in December, with total rainfall of approximately 111 mm. The maximum amount of rainfall per day is around 26 mm, which is moderate rain.December is a pretty wet month with over 16 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of wellies.
Here’s how December is compared with other months in the amount of precipitation, total mm:
San Jose wettest month is February, where a typical day has a 43% chance of precipitation and 125 mm of rainfall per day. September, on the other hand, is the driest month with a mere 7% chance of precipitation and 6 mm of rainfall per day.
How was the weather last December in San Jose?
This is the weather in San Jose in December 2024:
1 December
☁️
+61°F
2 December
☁️
+63°F
3 December
☁️
+66°F
4 December
☁️
+65°F
5 December
☀️
+70°F
6 December
☀️
+66°F
7 December
🌧️
+62°F
8 December
☀️
+58°F
9 December
☀️
+62°F
10 December
☀️
+61°F
11 December
☀️
+63°F
12 December
☁️
+63°F
13 December
☀️
+63°F
14 December
☀️
+63°F
15 December
☀️
+65°F
16 December
☀️
+68°F
17 December
☀️
+67°F
18 December
🌧️
+63°F
19 December
🌧️
+64°F
20 December
🌧️
+62°F
21 December
🌧️
+59°F
22 December
☁️
+65°F
23 December
☀️
+63°F
24 December
☀️
+61°F
25 December
☁️
+60°F
26 December
☁️
+60°F
27 December
☁️
+63°F
28 December
☁️
+70°F
29 December
☁️
+68°F
30 December
🌧️
+62°F
31 December
☁️
+60°F
In December 2024 San Jose had 13 sunny days, 12 cloudy days, and 6 rainy days. The average maximum temperature was +63°F, with an absolute maximum of +70°F and a minimum of +57°F. The average humidity was 74%, with a maximum of 98% and a minimum of 31%. The average wind speed was 6 m/s, with a maximum of 16 m/s and a minimum of 0 m/s.
Are you planning a trip in December?
Climate Change Over the Years
This is how San Jose climate has changed over the last 43 years.
The climate in San Jose in December has not changed that much over the last 43 years.
The average temperature was the lowest in 1982 (+67°F) and the highest in 2024 (+75°F). The driest year was 2013 with only 147 mm of rainfall, and the wettest year was 2020 with 4306 mm.
FAQ
Frequently asked questions about the weather in San Jose in December:
Is December a good time to visit San Jose?
It’s always a good time to visit San Jose, but the weather is changeable in December, so plan a mix of indoor and outdoor activities and exploring, and pack for every eventuality.
Can you sunbathe in San Jose in December?
December has mild temperatures in San Jose. Not ideal for sunbathing, but still good for daytime outdoor activities, but plan for cool evenings. Pack a light jacket and shorts!
Is San Jose rainy in December?
San Jose is often rainy in December. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.
Is it sunny in San Jose in December?
Usually, it’s not very sunny in San Jose in December, 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 Jose, 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.
