San Diego weather in January
San Diego in January averages 14°C (58°F) and 50 mm of rain.
Of the twelve months in San Diego, January is the second coldest and the second wettest.
- Average temp
- 14°C (58°F)
10–19°C · 50–66°F
- Rainfall
- 50 mm
Showers likely
- Sunshine
- —
- Wind
- 8 km/h
What is San Diego like in January?
Daytime
Days are mild.
Rain
Some rain is likely; pack for showers.
Evening
Evenings are cooler. A layer helps after sunset.
What should I pack for San Diego in January?
A light rain jacket
About 50 mm falls this month — showers rather than washouts.
A warm mid-layer
Nights drop to around 10°C (50°F).
January compared with December and February
January in San Diego is about the same temperature as December and about as wet as it, which averages 14°C (58°F).
January in San Diego is about the same temperature as February and about as wet as it, which averages 15°C (59°F).
Daylight in San Diego in January
On 15 January the sun is up for 10 hours 14 minutes in San Diego, rising about 06:51 and setting about 17:05 local time.
January ends 33 minutes longer than it begins, so the last week of the month is a different length of day from the first.
That is 4 hours 4 minutes short of June, the longest-lit month here.
Where to stay in San Diego
Dates are a starting point for January.
Travel guides for San Diego
What to read before you book.
San Diego weather by month
TemperatureRainfall
How January compares with the rest of the year
January 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
This is the month you are reading. Change either side to look at another.
FAQs about San Diego in January
January climate averages for San Diego, 1991–2020.
San Diego averages 14°C (58°F) in January, ranging from about 10°C (50°F) at night to 19°C (66°F) in the afternoon. That is a 1991–2020 average, so an individual week can run either side of it.
Some. About 50 mm falls across January, enough to need a light jacket but not enough to reshape a trip.
They are about the same. January averages 14°C (58°F) and February 15°C (59°F), so temperature alone will not decide between them.
January is about as warm as December, and about as wet.
It is outside the easiest window. The most comfortable stretch here is May to October; January 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 January 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 14 minutes of daylight in mid-January, against 14 hours 18 minutes in June and 10 hours 1 minute in December.
On 15 January, sunrise is about 06:51 and sunset about 17:05 local time. Both shift across the month — the month ends 33 minutes longer than it starts.
