Climate averages 1991–2020
Pleasanton weather
in January.
A cool, moderately wet month: the 11th warmest and one of the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a cool month in Pleasanton: daytime highs average 14.1°C and nights cool to about 5.5°C. By daytime temperature it is the 11th warmest of the 12 months.
Expect about 86 mm of rain on roughly 9 days, which makes January a moderately wet month (one of the wettest months of the year). Daylight, from sunrise to sunset, lasts about 9 h 53 min on an average January day.
The nearest other city in this atlas is Livermore (10 km away). In January its highs average 13.9°C, about as warm as Pleasanton, with 86 mm of rain.
Among the 498 cities listed in the United States, Pleasanton ranks joint 160th of 498 for the warmest January highs and joint 326th of 498 for the driest January (rainfall, lowest first). The mean January high of those 498 cities is 9.5°C; Pleasanton is 4.6°C warmer than that mean.
From January to February, average highs rise by 1.3°C to 15.4°C, and monthly rainfall stays at 86 mm.
The annual picture
January in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Pleasanton climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 14.1°C5.5°C | 5.5°C | 86 | 9.4 | 9.910 h |
| February | 15.4°C6.3°C | 6.3°C | 86 | 8.9 | 10.811 h |
| March | 17.3°C7.5°C | 7.5°C | 67 | 8.7 | 11.912 h |
| April | 19.5°C8.5°C | 8.5°C | 32 | 5.2 | 13.113 h |
| May | 22.9°C10.6°C | 10.6°C | 16 | 3.0 | 14.214 h |
| June | 26.6°C12.9°C | 12.9°C | 3.9 | 0.8 | 14.715 h |
| July | 29.0°C14.7°C | 14.7°C | 1.0 | 0.2 | 14.514 h |
| August | 28.9°C14.8°C | 14.8°C | 2.1 | 0.3 | 13.614 h |
| September | 28.0°C14.4°C | 14.4°C | 1.7 | 0.5 | 12.512 h |
| October | 23.9°C12.4°C | 12.4°C | 21 | 2.8 | 11.311 h |
| November | 17.8°C8.7°C | 8.7°C | 40 | 5.6 | 10.210 h |
| December | 13.9°C5.8°C | 5.8°C | 79 | 8.8 | 9.610 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
January in nearby cities
- Livermore in JanuaryUnited States · 10 kmHigh 13.9°C · Low 5.3°C · 86 mm rain
- Union City in JanuaryUnited States · 15 kmHigh 14.3°C · Low 5.9°C · 91 mm rain
- San Ramon in JanuaryUnited States · 16 kmHigh 13.8°C · Low 5.3°C · 89 mm rain
- Fremont in JanuaryUnited States · 16 kmHigh 14.4°C · Low 6.0°C · 91 mm rain
- Hayward in JanuaryUnited States · 18 kmHigh 14.0°C · Low 5.8°C · 89 mm rain
- Milpitas in JanuaryUnited States · 26 kmHigh 14.8°C · Low 6.5°C · 91 mm rain
- Sunnyvale in JanuaryUnited States · 36 kmHigh 14.3°C · Low 6.2°C · 129 mm rain
- Mountain View in JanuaryUnited States · 36 kmHigh 14.5°C · Low 6.6°C · 91 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Pleasanton) is explained once on the Pleasanton year overview and on the Sources, method and limits page.
Livermore lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.