San Diego weather in January: San Diego, California: normal highs, lows, rain and records for January
San Diego in January has a normal high of 66°F and a normal low of 50°F, a daily mean of 58°F, holding near 66°F all month. Measurable precipitation falls on 7 days in a normal January, 1.98 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 19°C and low of 10°C, 50 mm of precipitation in January.
- NOAA stationSan Diego Lindbergh Field
- Station IDUSW00023188
- Location32.73°N 117.18°W
- Elevation15 ft (5 m)
- From the center6 miles
- Population1,404,452
- Jan 66° 50°
- Feb 66° 52°
- Mar 67° 55°
- Apr 69° 57°
- May 70° 60°
- Jun 72° 63°
- Jul 75° 66°
- Aug 77° 68°
- Sep 77° 66°
- Oct 75° 62°
- Nov 71° 55°
- Dec 66° 50°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is San Diego in January?
The normal high is 66°F and the normal low 50°F, for a daily mean of 58.4°F. January is 0.5°F warmer than December and 0.6°F cooler than February. January is the 11th warmest month of the year in San Diego and the 2nd wettest. From one year to the next January's mean temperature typically moves about 1.8°F either way (NOAA's standard deviation), so roughly two Januarys in three average between 57°F and 60°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 22%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| January 1 | 66°F | 50°F | 20% | 12% |
| January 8 | 66°F | 50°F | 21% | 13% |
| January 15 | 67°F | 50°F | 20% | 13% |
| January 22 | 67°F | 51°F | 21% | 12% |
| January 31 | 66°F | 51°F | 22% | 12% |
Every day of January: normal high, low and chance of precipitation (warmest afternoon January 17, coldest night January 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| January 1 | 66°F | 50°F | 20% | 12% | 10 h |
| January 2 | 66°F | 50°F | 21% | 13% | 10 h |
| January 3 | 66°F | 50°F | 21% | 13% | 10 h |
| January 4 | 66°F | 50°F | 21% | 13% | 10 h |
| January 5 | 66°F | 50°F | 21% | 13% | 10 h |
| January 6 | 66°F | 50°F | 21% | 13% | 10 h |
| January 7 | 66°F | 50°F | 21% | 13% | 10 h 10 min |
| January 8 | 66°F | 50°F | 21% | 13% | 10 h 10 min |
| January 9 | 66°F | 50°F | 21% | 13% | 10 h 10 min |
| January 10 | 66°F | 50°F | 20% | 13% | 10 h 10 min |
| January 11 | 66°F | 50°F | 20% | 13% | 10 h 10 min |
| January 12 | 66°F | 50°F | 20% | 13% | 10 h 10 min |
| January 13 | 67°F | 50°F | 20% | 13% | 10 h 10 min |
| January 14 | 67°F | 50°F | 20% | 13% | 10 h 10 min |
| January 15 | 67°F | 50°F | 20% | 13% | 10 h 10 min |
| January 16 | 67°F | 50°F | 20% | 13% | 10 h 10 min |
| January 17 | 67°F | 50°F | 20% | 13% | 10 h 20 min |
| January 18 | 67°F | 50°F | 20% | 12% | 10 h 20 min |
| January 19 | 67°F | 51°F | 21% | 12% | 10 h 20 min |
| January 20 | 67°F | 51°F | 21% | 12% | 10 h 20 min |
| January 21 | 67°F | 51°F | 21% | 12% | 10 h 20 min |
| January 22 | 67°F | 51°F | 21% | 12% | 10 h 20 min |
| January 23 | 67°F | 51°F | 21% | 12% | 10 h 20 min |
| January 24 | 67°F | 51°F | 21% | 12% | 10 h 20 min |
| January 25 | 67°F | 51°F | 21% | 12% | 10 h 30 min |
| January 26 | 67°F | 51°F | 21% | 12% | 10 h 30 min |
| January 27 | 67°F | 51°F | 21% | 12% | 10 h 30 min |
| January 28 | 67°F | 51°F | 21% | 12% | 10 h 30 min |
| January 29 | 67°F | 51°F | 22% | 12% | 10 h 30 min |
| January 30 | 67°F | 51°F | 22% | 12% | 10 h 30 min |
| January 31 | 66°F | 51°F | 22% | 12% | 10 h 30 min |
- Normal high
- 66°FJanuary average
- Normal low
- 50°FJanuary average
- Precipitation
- 1.98 inmonth total
- Days with precipitation
- 70.01 inch or more
- Daylight
- 10 h to 10 h 30 minJanuary 1 to January 31
- Days at 70°F or more
- 8
- Days at 80°F or more
- 1
- Sunshine
- 83%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00023188; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in San Diego in January?
On a given January day the chance of 0.01 inch or more is 21% on average, highest around January 31 (22%). In all, 1.98 in falls on 7 days of a normal January, 1 of them with an inch or more.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00023188.
How humid and windy is San Diego in January?
At 3 p.m. the normal temperature is 64°F with 51% relative humidity and a dew point of 45°F; at 6 a.m. it is 52°F with 70% humidity. The wind averages 5.1 mph, most often from the west in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 52°F | 43°F | 70% | 2.8 mph | 49% |
| 9 a.m. | 57°F | 43°F | 58% | 3.8 mph | 38% |
| noon | 64°F | 43°F | 46% | 8.2 mph | 42% |
| 3 p.m. | 64°F | 45°F | 51% | 9.8 mph | 39% |
| 6 p.m. | 60°F | 47°F | 61% | 6.0 mph | 40% |
| 9 p.m. | 58°F | 47°F | 67% | 3.6 mph | 51% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00023188. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for January in San Diego?
The warmest January temperature on San Diego's official record (since 1874) is 88°F, on January 10, 1953; the coldest is 25°F, on January 7, 1913. The wettest January brought 9.09 in (1993).
The January mean against the 1991-2020 normal of 58.4°F: 2021 58.0°F (−0.4), 2022 56.9°F (−1.5), 2023 55.8°F (−2.6), 2024 56.1°F (−2.3), 2025 56.3°F (−2.1), 2026 59.6°F (+1.2). 1 of 6 ran warmer than normal.
| January | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 58.0°F | −0.4°F | 1.80 in |
| 2022 | 56.9°F | −1.5°F | 0.16 in |
| 2023 | 55.8°F | −2.6°F | 5.14 in |
| 2024 | 56.1°F | −2.3°F | 3.65 in |
| 2025 | 56.3°F | −2.1°F | 0.21 in |
| 2026 | 59.6°F | +1.2°F | 3.10 in |
Source: records: ACIS, NWS threaded record SANthr; recent months: ACIS, station USW00023188. Records and recent months use complete months only.
How does January in San Diego compare across California?
Across the 219 places PlainClimate covers in California, January normal highs run from 37°F in Tahoma to 72°F in Brawley; San Diego's is 66°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.