Weather in Antioch, California
Fog and sun in daily rhythm. Day 58 of spring. Read this microseason across nine climate regions →
- TodayMay 16Overcast—79°58°
- SundayMay 17Overcast—75°56°
- MondayMay 18Partly Cloudy—85°58°
- TuesdayMay 19Mostly Clear—91°56°
- WednesdayMay 20Overcast—93°58°
- ThursdayMay 21Overcast—92°58°
- FridayMay 22Overcast—89°56°
- PM 2.5
- 4.6 μg/m³
- PM 10
- 30.3 μg/m³
- NO₂
- 0.8 μg/m³
- Ozone
- 113.0 μg/m³
- UV Index
- 4.0 Moderate
Flowers blooming in late autumn, a sure sign of a bad winter coming.
- Moonrise
- 12:23 PM
- Moonset
- 2:29 AM
- In sign
- ♉︎ Taurus
Fog and sun in daily rhythm
Antioch at a glance
- Today vs. normal: 4°F above the seasonal normal for this latitude
- Last frost: April 4 (climatological average for this latitude)
- Microseason: 28 of 72, May 16–20
- Planting window: Direct sow okra, melons, and southern peas. Thin carrot rows.
Right now in the garden
Warm-season window is open
As of May 16, the last spring frost has passed for most years. Transplant tomatoes, peppers, eggplants, basil, and cucurbits (cucumbers, squash, melons) now. Direct-sow beans and corn into warm soil.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | — | — |
| March | — | — |
| April | lettuce, peas, spinach, radishes | — |
| May | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | tomatoes, peppers, beans, squash | tomatoes, beans, summer squash |
| August | — | tomatoes, beans, summer squash |
| September | fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| October | fall brassicas, garlic (overwinter), carrots | winter squash, tomatoes (last) |
| November | — | — |
| December | — | — |
A year in weather
July stands as Antioch's warmest month with temperatures averaging around 76°F, while January brings the coldest conditions at roughly 48°F. January also delivers the heaviest rainfall at 2.7 inches, contrasting sharply with July's bone-dry 0.0 inches.
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 48° | 2.7″ | 6 |
| February | 52° | 2.4″ | 6 |
| March | 57° | 1.9″ | 5 |
| April | 61° | 0.9″ | 2 |
| May | 67° | 0.4″ | 1 |
| June | 73° | 0.1″ | 0 |
| July | 76° | 0.0″ | 0 |
| August | 75° | 0.0″ | 0 |
| September | 73° | 0.1″ | 0 |
| October | 66° | 0.4″ | 1 |
| November | 55° | 1.2″ | 3 |
| December | 48° | 2.5″ | 6 |
Regional context
Antioch belongs to the hot-summer Mediterranean climate region, sharing similar temperature ranges, seasonal patterns, and growing conditions with other cities in this climate zone.
Similar climates: Los Angeles, CA, San Francisco, CA, San Diego, CA, Riverside, CA, Sacramento, CA.
Naturalist notes
Late May brings the peak blooming period for California poppies across the hillsides surrounding Antioch.
Red-winged blackbirds establish their territories in the marsh areas during April, their distinctive calls echoing through the wetlands.
Frequently asked
- When does it freeze in Antioch?
- Spring's final frost in Antioch usually occurs around mid-April, while the first fall frost returns around mid-November.
- What is the rainy season in Antioch?
- January stands as the wettest month, delivering about 2.7 inches of rain on average, while the city receives roughly 13 inches annually.
- What is the warmest month in Antioch?
- July typically brings the warmest temperatures, averaging about 76°F.
- What is the coldest month in Antioch?
- January typically delivers the coldest temperatures, averaging about 48°F.
- When can I start a vegetable garden in Antioch?
- Cool-season crops like peas and lettuce can be planted around the last spring frost in mid-April, while warm-season crops such as tomatoes and peppers should wait 1–2 weeks after.
- How many rainy days does Antioch get?
- Antioch experiences about 30 rainy days per year on average.
- What hardiness zone is Antioch?
- Antioch's USDA hardiness zone depends on its lowest average winter temperature; the USDA's online lookup tool using the city ZIP code provides the current zone designation.
Climate
Antioch, California experiences a hot-summer Mediterranean climate zone. Temperatures hover near 48°F in January and climb to an average of 76°F in July, creating a 28°F seasonal swing.
Annual precipitation in Antioch totals about 13 inches, falling across roughly 30 rainy days throughout the year.
Geography shapes Antioch's weather patterns through its latitude at 38.0°N, proximity to large water bodies, and elevation. These factors determine what grows in the area, when frost threatens, and the daily weather patterns residents experience.