San Diego weather in December
San Diego in December averages 14°C (58°F) and 42 mm of rain.
Of the twelve months in San Diego, December is the coldest and the third wettest.
- Average temp
- 14°C (58°F)
10–19°C · 49–65°F
- Rainfall
- 42 mm
Not much rain
- Sunshine
- —
- Wind
- 8 km/h
What is San Diego like in December?
Daytime
Days are mild.
Rain
Rain is usually light.
Evening
Evenings are cooler. A layer helps after sunset.
What should I pack for San Diego in December?
A warm mid-layer
Nights drop to around 10°C (49°F).
December compared with November and January
December in San Diego is 2.6°C cooler than November and 22 mm wetter than it, which averages 17°C (62°F).
December in San Diego is about the same temperature as January and about as wet as it, which averages 14°C (58°F).
Daylight in San Diego in December
On 15 December the sun is up for 10 hours 1 minute in San Diego, rising about 06:43 and setting about 16:44 local time.
No month in San Diego has less daylight than December.
Where to stay in San Diego
Dates are a starting point for December.
Travel guides for San Diego
What to read before you book.
San Diego weather by month
TemperatureRainfall
How December compares with the rest of the year
December is highlighted. Every other month links to its own page.
| Month | Average | Rainfall |
|---|---|---|
| January | 14°C / 58°F | 50 mm |
| February | 15°C / 59°F | 56 mm |
| March | 16°C / 60°F | 37 mm |
| April | 17°C / 62°F | 17 mm |
| May | 18°C / 64°F | 7 mm |
| June | 19°C / 67°F | 1 mm |
| July | 21°C / 70°F | 2 mm |
| August | 22°C / 72°F | 0 mm |
| September | 22°C / 71°F | 3 mm |
| October | 20°C / 68°F | 13 mm |
| November | 17°C / 62°F | 20 mm |
| December | 14°C / 58°F | 42 mm |
Check another month
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FAQs about San Diego in December
December climate averages for San Diego, 1991–2020.
San Diego averages 14°C (58°F) in December, ranging from about 10°C (49°F) at night to 19°C (65°F) in the afternoon. That is a 1991–2020 average, so an individual week can run either side of it.
Barely. December sees only about 42 mm, so rain is unlikely to affect your plans.
They are about the same. December averages 14°C (58°F) and January 14°C (58°F), so temperature alone will not decide between them.
December is 2.6°C cooler than November, and 22 mm wetter.
It is outside the easiest window. The most comfortable stretch here is May to October; December sits outside it, which usually means more heat, more rain, or both — worth it if you would rather have the place to yourself.
This page does not show today's weather. It is a 1991–2020 climate normal from Meteostat — a long-run average of what December is usually like, which is what you want when booking months ahead. For today or the coming week, check a live forecast.
About 10 hours 1 minute of daylight in mid-December, the least of any month in San Diego.
On 15 December, sunrise is about 06:43 and sunset about 16:44 local time. Both shift across the month.
