Topanga, California Weather
Coastal fog thickens at dawn. Day 76 of spring. Read this microseason across nine climate regions →
Topanga weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Foggy——83°53°—
- ThursdayJun 4Clear——80°53°-3°
- FridayJun 5Foggy——86°54°+6°
- SaturdayJun 6Foggy——78°60°-8°
- SundayJun 7Clear——77°59°-1°
- MondayJun 8Overcast——84°59°+7°
- TuesdayJun 9Foggy——85°62°+1°
PM2.5 at 10.9 µg/m³ (AQI 54) with a 0.60 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust. AQI flat over the last 6 hours (within ±3 points).
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 43 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 43
- UV peak
- 4.0 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 43
PM × Wind × Precip
PM2.5 at 10.9 µg/m³ (AQI 54) with a 0.60 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.60
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
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).
The higher the clouds, the finer the weather.
- Moonrise
- 5:29 AM
- Moonset
- 3:17 PM
- In sign
- ♑︎ Capricorn
Coastal fog thickens at dawn
Topanga at a glance
- Today vs. normal: 82°F — typical for the season
- Last frost: March 12 (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 3, 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
Topanga's warmest month is August (~71°F mean) and its coldest is February (~59°F). Rainfall peaks in February (4.7 inches) and bottoms out in August (0.0 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 60° | 4.1″ | 5 |
| February | 59° | 4.7″ | 5 |
| March | 60° | 2.7″ | 4 |
| April | 62° | 0.8″ | 2 |
| May | 63° | 0.4″ | 1 |
| June | 66° | 0.1″ | 0 |
| July | 70° | 0.0″ | 0 |
| August | 71° | 0.0″ | 0 |
| September | 71° | 0.1″ | 0 |
| October | 68° | 0.7″ | 1 |
| November | 64° | 1.0″ | 2 |
| December | 59° | 2.9″ | 3 |
Regional context
Topanga sits within a hot-summer Mediterranean climate region — a cohort that shares similar temperature ranges, seasonal patterns, and growing conditions across nearby cities.
Similar climates: Los Angeles, CA, San Francisco, CA, San Diego, CA, Riverside, CA, Sacramento, CA.
Frequently asked
- When does it freeze in Topanga?
- Topanga's last spring frost typically falls around mid-March, and the first fall frost arrives around mid-December.
- What is the rainy season in Topanga?
- February is the wettest month with about 4.7 inches of rain on average; the city receives roughly 18 inches annually.
- What is the warmest month in Topanga?
- August is typically warmest, averaging about 71°F.
- What is the coldest month in Topanga?
- February is typically coldest, averaging about 59°F.
- When can I start a vegetable garden in Topanga?
- 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 Topanga get?
- Topanga averages about 22 rainy days per year.
- What hardiness zone is Topanga?
- Topanga'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
Topanga, California sits in a hot-summer Mediterranean climate zone. January means hover near 60°F while July averages 70°F — a 10°F seasonal swing.
Across the year, Topanga receives about 18 inches of precipitation spread over roughly 22 rainy days.
The rhythm of the year is set by latitude (34.1°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.