Best time to visit Brentwood
The best time to visit Brentwood is March–November, judged on twenty years of weather records and the events worth going for.
Brentwood, California, United States
°C
mm
- Average daily high and low
- Precipitation
- Good month
- Best month
- Made good or best by an event
| Month | Average daily high | Average daily low | Precipitation | Verdict |
|---|---|---|---|---|
| January | 14.5 °C / 58 °F | 6 °C / 43 °F | 85 mm / 3.3 in | good month |
| February | 16.7 °C / 62 °F | 7 °C / 45 °F | 77 mm / 3 in | good month |
| March | 18.7 °C / 66 °F | 8.5 °C / 47 °F | 68 mm / 2.7 in | best month |
| April | 21.9 °C / 71 °F | 10.2 °C / 50 °F | 28 mm / 1.1 in | best month |
| May | 25 °C / 77 °F | 12.4 °C / 54 °F | 12 mm / 0.5 in | best month |
| June | 28 °C / 82 °F | 14.5 °C / 58 °F | 3 mm / 0.1 in | best month |
| July | 28.9 °C / 84 °F | 15.2 °C / 59 °F | 1 mm / 0 in | best month |
| August | 28.9 °C / 84 °F | 15.4 °C / 60 °F | 0 mm / 0 in | best month |
| September | 28.3 °C / 83 °F | 14.7 °C / 58 °F | 2 mm / 0.1 in | best month |
| October | 24.6 °C / 76 °F | 12.2 °C / 54 °F | 26 mm / 1 in | best month |
| November | 18.3 °C / 65 °F | 8.5 °C / 47 °F | 45 mm / 1.8 in | best month |
| December | 14 °C / 57 °F | 6 °C / 43 °F | 86 mm / 3.4 in | good month |
Good and best months depend on more than temperature, rain and events. How they are chosen
Each activity on this page has its own good and best months, rated on twenty years of daily weather records. Which measures count, and how much, depends on the activity: humidity for exploring outdoors, wind for the beach, hiking and skiing, snow for skiing alone. Between them, the activities are rated on:
- Daytime highs
- Night-time lows
- How warm it feels
- Humidity
- How much of the day is sunny
- Hours of daylight
- Monthly rainfall
- How many days it rains
- Days of heavy rain
- Wind
- Snowfall and days with snow
- Major events, such as festivals
The chart shows the good and best months for exploring outdoors.
The event icon marks a month that an event lifts to good or best, such as a festival or a natural spectacle. Choose “Weather only” in the toolbar to rate the months on weather alone.
Best months by activity
Exploring outdoors
Mild days and nights, mostly dry and bright. The default for 'when should I go'.
- JJanuary: good
- FFebruary: good
- MMarch: best
- AApril: best
- MMay: best
- JJune: best
- JJuly: best
- AAugust: best
- SSeptember: best
- OOctober: best
- NNovember: best
- DDecember: good
- Best
- March–November
- Good
- December–February
Why these months
January · good
In its favour: share of daylight that is sunny 74%, precipitation 85 mm / 3.3 in, feels like (high) 12.6 °C / 55 °F, average daily high 14.5 °C / 58 °F, wet days 7.9 days, days with heavy rain 2.9 days, average daily low 6 °C / 43 °F, relative humidity 77%.
February · good
In its favour: feels like (high) 14.6 °C / 58 °F, share of daylight that is sunny 81%, precipitation 77 mm / 3 in, average daily high 16.7 °C / 62 °F, wet days 7.3 days, days with heavy rain 2.8 days, average daily low 7 °C / 45 °F, relative humidity 71%.
March · best
In its favour: feels like (high) 16.9 °C / 62 °F, average daily high 18.7 °C / 66 °F, share of daylight that is sunny 81%, precipitation 68 mm / 2.7 in, wet days 8.5 days, days with heavy rain 2.6 days, average daily low 8.5 °C / 47 °F, relative humidity 68%.
April · best
In its favour: feels like (high) 20.5 °C / 69 °F, average daily high 21.9 °C / 71 °F, precipitation 28 mm / 1.1 in, share of daylight that is sunny 87%, wet days 4.1 days, days with heavy rain 0.9 days, average daily low 10.2 °C / 50 °F, relative humidity 62%.
May · best
In its favour: feels like (high) 23.8 °C / 75 °F, average daily high 25 °C / 77 °F, precipitation 12 mm / 0.5 in, share of daylight that is sunny 93%, wet days 2.3 days, days with heavy rain 0.3 days, average daily low 12.4 °C / 54 °F, relative humidity 58%.
June · best
In its favour: feels like (high) 27.7 °C / 82 °F, precipitation 3 mm / 0.1 in, share of daylight that is sunny 93%, wet days 0.3 days, days with heavy rain 0.1 days, average daily high 28 °C / 82 °F, average daily low 14.5 °C / 58 °F, relative humidity 58%.
July · best
In its favour: precipitation 1 mm / 0 in, share of daylight that is sunny 96%, feels like (high) 29.4 °C / 85 °F, wet days 0.3 days, days with heavy rain 0 days, average daily high 28.9 °C / 84 °F, average daily low 15.2 °C / 59 °F, relative humidity 62%.
August · best
In its favour: feels like (high) 29.3 °C / 85 °F, precipitation 0 mm / 0 in, share of daylight that is sunny 96%, wet days 0 days, days with heavy rain 0 days, average daily high 28.9 °C / 84 °F, average daily low 15.4 °C / 60 °F, relative humidity 63%.
September · best
In its favour: feels like (high) 28 °C / 82 °F, precipitation 2 mm / 0.1 in, share of daylight that is sunny 95%, wet days 0.5 days, days with heavy rain 0.1 days, average daily high 28.3 °C / 83 °F, average daily low 14.7 °C / 58 °F, relative humidity 62%.
October · best
In its favour: feels like (high) 23.2 °C / 74 °F, average daily high 24.6 °C / 76 °F, precipitation 26 mm / 1 in, share of daylight that is sunny 90%, wet days 2.8 days, days with heavy rain 0.8 days, average daily low 12.2 °C / 54 °F, relative humidity 62%.
November · best
In its favour: feels like (high) 16.7 °C / 62 °F, average daily high 18.3 °C / 65 °F, precipitation 45 mm / 1.8 in, share of daylight that is sunny 83%, wet days 5.2 days, days with heavy rain 1.4 days, average daily low 8.5 °C / 47 °F, relative humidity 71%.
December · good
In its favour: share of daylight that is sunny 72%, precipitation 86 mm / 3.4 in, average daily high 14 °C / 57 °F, wet days 8.8 days, days with heavy rain 2.8 days, average daily low 6 °C / 43 °F, relative humidity 76%.
Against: feels like (high) 11.9 °C / 53 °F.
Hiking and trekking
Cool enough to climb in, dry enough to enjoy, long enough days.
- JJanuary: best
- FFebruary: best
- MMarch: best
- AApril: best
- MMay: best
- JJune: good
- JJuly: neither
- AAugust: neither
- SSeptember: good
- OOctober: best
- NNovember: best
- DDecember: best
- Best
- October–May
- Good
- June, September
Why these months
January · best
In its favour: average daily high 14.5 °C / 58 °F, precipitation 85 mm / 3.3 in, wet days 7.9 days, feels like (high) 12.6 °C / 55 °F, average daily low 6 °C / 43 °F, share of daylight that is sunny 74%, days with heavy rain 2.9 days, wind (daily max) 12 km/h / 7 mph.
Against: daylight per day 9.9 h.
February · best
In its favour: average daily high 16.7 °C / 62 °F, precipitation 77 mm / 3 in, wet days 7.3 days, feels like (high) 14.6 °C / 58 °F, average daily low 7 °C / 45 °F, share of daylight that is sunny 81%, days with heavy rain 2.8 days, daylight per day 10.8 h, wind (daily max) 14 km/h / 9 mph.
March · best
In its favour: average daily high 18.7 °C / 66 °F, precipitation 68 mm / 2.7 in, wet days 8.5 days, feels like (high) 16.9 °C / 62 °F, average daily low 8.5 °C / 47 °F, share of daylight that is sunny 81%, daylight per day 12 h, days with heavy rain 2.6 days, wind (daily max) 15 km/h / 9 mph.
April · best
In its favour: average daily high 21.9 °C / 71 °F, precipitation 28 mm / 1.1 in, wet days 4.1 days, days with heavy rain 0.9 days, feels like (high) 20.5 °C / 69 °F, average daily low 10.2 °C / 50 °F, share of daylight that is sunny 87%, daylight per day 13.2 h, wind (daily max) 16 km/h / 10 mph.
May · best
In its favour: precipitation 12 mm / 0.5 in, wet days 2.3 days, days with heavy rain 0.3 days, average daily high 25 °C / 77 °F, average daily low 12.4 °C / 54 °F, share of daylight that is sunny 93%, daylight per day 14.2 h, feels like (high) 23.8 °C / 75 °F, wind (daily max) 19 km/h / 12 mph.
June · good
In its favour: precipitation 3 mm / 0.1 in, wet days 0.3 days, days with heavy rain 0.1 days, share of daylight that is sunny 93%, daylight per day 14.8 h, average daily low 14.5 °C / 58 °F, wind (daily max) 19 km/h / 12 mph.
Against: average daily high 28 °C / 82 °F, feels like (high) 27.7 °C / 82 °F.
September · good
In its favour: precipitation 2 mm / 0.1 in, wet days 0.5 days, days with heavy rain 0.1 days, share of daylight that is sunny 95%, daylight per day 12.4 h, average daily low 14.7 °C / 58 °F, wind (daily max) 15 km/h / 9 mph.
Against: average daily high 28.3 °C / 83 °F, feels like (high) 28 °C / 82 °F.
October · best
In its favour: precipitation 26 mm / 1 in, wet days 2.8 days, days with heavy rain 0.8 days, average daily high 24.6 °C / 76 °F, average daily low 12.2 °C / 54 °F, share of daylight that is sunny 90%, feels like (high) 23.2 °C / 74 °F, daylight per day 11.2 h, wind (daily max) 13 km/h / 8 mph.
November · best
In its favour: average daily high 18.3 °C / 65 °F, precipitation 45 mm / 1.8 in, wet days 5.2 days, days with heavy rain 1.4 days, feels like (high) 16.7 °C / 62 °F, average daily low 8.5 °C / 47 °F, share of daylight that is sunny 83%, wind (daily max) 11 km/h / 7 mph, daylight per day 10.1 h.
December · best
In its favour: average daily high 14 °C / 57 °F, precipitation 86 mm / 3.4 in, wet days 8.8 days, feels like (high) 11.9 °C / 53 °F, average daily low 6 °C / 43 °F, share of daylight that is sunny 72%, days with heavy rain 2.8 days, wind (daily max) 12 km/h / 7 mph.
Against: daylight per day 9.6 h.
An activity is listed only where it applies: skiing at ski destinations, beach and swimming at beach destinations. The nearest ski area is Bear Valley, 155 km away.
Weather averages
Monthly averages over twenty years, 2006–2025. Highs, lows and precipitation are in the chart at the top.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels like (high) | 12.6 °C | 14.6 °C | 16.9 °C | 20.5 °C | 23.8 °C | 27.7 °C | 29.4 °C | 29.3 °C | 28 °C | 23.2 °C | 16.7 °C | 11.9 °C |
| Days with heavy rain | 2.9 days | 2.8 days | 2.6 days | 0.9 days | 0.3 days | 0.1 days | 0 days | 0 days | 0.1 days | 0.8 days | 1.4 days | 2.8 days |
| Time rain usually falls | 4 pm | 7 am | 4 pm | 2 pm | 12 pm | 3 pm | 12 pm | 10 am | 2 pm | 4 pm | 1 pm | 5 pm |
| Sunshine per day | 7.3 h | 8.7 h | 9.7 h | 11.5 h | 13.2 h | 13.7 h | 13.9 h | 13 h | 11.8 h | 10.1 h | 8.4 h | 6.9 h |
| Relative humidity | 77% | 71% | 68% | 62% | 58% | 58% | 62% | 63% | 62% | 62% | 71% | 76% |
Air quality
Averaged over a shorter period (2022–2025) than the twenty-year averages above, and not counted towards good or best months.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Air pollution (PM2.5) 2022–2025 | 10.8 µg/m³ | 10.6 µg/m³ | 9.5 µg/m³ | 9.9 µg/m³ | 8.2 µg/m³ | 8.9 µg/m³ | 9.9 µg/m³ | 9.4 µg/m³ | 10.1 µg/m³ | 10.5 µg/m³ | 12.5 µg/m³ | 15.8 µg/m³ |
| Air pollution (PM2.5, daily peak) 2022–2025 | 16.8 µg/m³ | 16.3 µg/m³ | 15.6 µg/m³ | 14.4 µg/m³ | 11.2 µg/m³ | 11.8 µg/m³ | 13.3 µg/m³ | 12.5 µg/m³ | 14.2 µg/m³ | 15.7 µg/m³ | 18.7 µg/m³ | 23.3 µg/m³ |
- Good 15 µg/m³ or less
- Fair 15 to 25 µg/m³
- Moderate 25 to 37.5 µg/m³
- Poor 37.5 to 50 µg/m³
- Very poor 50 to 75 µg/m³
- Extremely poor over 75 µg/m³
Each figure is compared with the World Health Organization's guideline for a day's air, 15 µg/m³ or less, and with its interim targets above that. The words are ours: the WHO does not name its steps. The figures are modelled monthly averages, so single days can be well above them. The daily peak is the average of each day's highest hour, shaded on the same scale.