March ARB, California Weather
Coastal fog thickens at dawn. Day 77 of spring. Read this microseason across nine climate regions →
March ARB weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Foggy——88°53°—
- ThursdayJun 4Clear——92°56°+4°
- FridayJun 5Overcast——93°56°+1°
- SaturdayJun 6Overcast——87°65°-6°
- SundayJun 7Mostly Clear——86°61°-1°
- MondayJun 8Clear——88°61°+2°
- TuesdayJun 9Clear——87°63°-1°
Ozone at AQI 153 — peak already passed at 1 PM under clear skies. AQI up 51 in the last 6 hours — air quality is degrading. Levels should ease through evening.
LIMIT OUTDOORS Limit prolonged outdoor exertion. Sensitive groups should avoid outdoor exertion. Consider rescheduling outdoor activities until AQI improves.
What's driving it
Ozone × UV × Sky
Ozone at AQI 153 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 153
- UV peak
- 2.0 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 153
PM × Wind × Precip
PM2.5/PM10 ratio 0.65 with 13 mph wind — characteristic of long-range haze transport rather than a local source.
- PM2.5/PM10
- 0.65
- Wind
- breezy
- Recent rain
- 0h in last 6h
- Pattern
- transport
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 6:02 AM
- Moonset
- 4:12 PM
- In sign
- ♑︎ Capricorn
Coastal fog thickens at dawn
March ARB at a glance
- Today vs. normal: 3°F above the seasonal normal for this latitude
- Last frost: March 10 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 4, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | — | — |
| March | lettuce, peas, spinach, radishes | — |
| April | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | — |
| May | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | — | tomatoes, beans, summer squash |
| August | — | tomatoes, beans, summer squash |
| September | — | tomatoes, beans, summer squash |
| October | fall brassicas, garlic (overwinter), carrots | winter squash, tomatoes (last) |
| November | fall brassicas, garlic (overwinter), carrots | — |
| December | — | — |
A year in weather
March ARB's warmest month is August (~80°F mean) and its coldest is December (~53°F). Rainfall peaks in February (3.0 inches) and bottoms out in August (0.1 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 54° | 2.8″ | 5 |
| February | 55° | 3.0″ | 5 |
| March | 58° | 2.0″ | 4 |
| April | 62° | 0.9″ | 2 |
| May | 66° | 0.3″ | 1 |
| June | 72° | 0.1″ | 0 |
| July | 79° | 0.1″ | 1 |
| August | 80° | 0.1″ | 0 |
| September | 76° | 0.1″ | 0 |
| October | 68° | 0.5″ | 1 |
| November | 60° | 0.9″ | 2 |
| December | 53° | 2.0″ | 4 |
Frequently asked
- When does it freeze in March ARB?
- March ARB's last spring frost typically falls around mid-March, and the first fall frost arrives around mid-December.
- What is the rainy season in March ARB?
- February is the wettest month with about 3.0 inches of rain on average; the city receives roughly 13 inches annually.
- What is the warmest month in March ARB?
- August is typically warmest, averaging about 80°F.
- What is the coldest month in March ARB?
- December is typically coldest, averaging about 53°F.
- When can I start a vegetable garden in March ARB?
- Cool-season crops (peas, lettuce) can be sown around the last spring frost (mid-March); warm-season crops (tomatoes, peppers) wait until 1–2 weeks after.
- How many rainy days does March ARB get?
- March ARB averages about 24 rainy days per year.
- What hardiness zone is March ARB?
- March ARB's USDA hardiness zone is determined by its lowest average winter temperature; check the USDA's online lookup with the city ZIP for the current zone designation.
Climate
March ARB, California sits in a hot-summer Mediterranean climate zone. January means hover near 54°F while July averages 79°F — a 25°F seasonal swing.
Across the year, March ARB receives about 13 inches of precipitation spread over roughly 24 rainy days.
The rhythm of the year is set by latitude (33.9°N), proximity to large water bodies, and elevation — all of which shape what grows here, when frost is likely, and what the weather story looks like day to day.