Thousand Oaks, California Weather
Ceanothus blooms again. Day 93 of summer. Read this microseason across nine climate regions →
Thousand Oaks weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 2:00 AM PDT · Open-Meteo
- TodaySep 21Clear——78°57°—
- TuesdaySep 22Clear——78°55°0°
- WednesdaySep 23Clear——91°70°+13°
- ThursdaySep 24Mostly Clear——91°71°0°
- FridaySep 25Overcast——93°73°+2°
- SaturdaySep 26Overcast——94°75°+1°
- SundaySep 27Overcast——93°75°-1°
Air quality now AQI 48 · Good
AQI 48 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 10.2 µg/m³ (AQI 53) with a 0.72 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in stagnant air, not road dust.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 3 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 34 now. With UV 3.3 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 11.
- Present
- AQI 34
- UV peak
- 3.3 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 11
PM × Wind × Precip
PM2.5 at 10.2 µg/m³ (AQI 53) with a 0.72 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in stagnant air, not road dust.
- PM2.5/PM10
- 0.72
- Wind
- calm
- 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).
September dries up ditches or breaks down bridges.
- Moonrise
- 4:15 PM
- Moonset
- 1:39 AM
- In sign
- ♑︎ Capricorn
Ceanothus blooms again
Read this microseason across nine climate regions →
All 72 microseasons on the year wheel →
Thousand Oaks at a glance
- Today vs. normal: Today averages 68°F (high 78°F, low 57°F), about the 69°F normal for Sep 21
- Last frost: January 24 (1991–2020 median, NOAA station 28 km away)
- Microseason: Sep 21–25
- Planting calendar: September — plant tomatoes, peppers, beans, squash, fall brassicas, carrots; harvest tomatoes, peppers, beans, summer squash, winter squash
15-Day Forecast — Thousand Oaks
- Mon78°57°1%
- Tue78°55°0%
- Wed91°70°0%
- Thu91°71°1%
- Fri93°73°1%
- Sat94°75°1%
- Sun93°75°1%
- Mon97°76°2%
- Tue98°83°5%
- Wed85°71°12%
- Thu74°68°2%
- Fri91°70°3%
- Sat92°78°3%
- Sun97°78°3%
- Mon84°72°3%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Thousand Oaks
Interactive wind and temperature map centered on Thousand Oaks — it loads in your browser. Open the full weather map.
Right now in the garden
Peak growing season
As of September 21, the growing season is at its peak — the first frost (around December 15) is weeks away. Fall transplants go in about 10–12 weeks before the first frost, September 22 to October 6 here. This city's planting calendar for September: plant tomatoes, peppers, beans, squash, fall brassicas, and carrots; harvest tomatoes, peppers, beans, summer squash, and winter squash.
Sun & seasons in Thousand Oaks
Thousand Oaks sits in Ventura County, where the year’s longest day runs 14h 26m of daylight and its shortest just 9h 52m — a swing of +4h 34m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.
Los Angeles, the state’s largest city, lies about 27 miles to the E. The nearest town Thousand Oaks tracks is Simi Valley, roughly 9 miles to the NE.
Air quality in Thousand Oaks
Air quality in Thousand Oaks’s county has trended cleaner since 2020; its cleanest year on record was 2023 (median AQI 46). See the full air-quality history for Thousand Oaks.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | lettuce, peas, spinach, radishes | radishes, fall brassicas, carrots |
| February | lettuce, peas, spinach, radishes | lettuce, spinach, radishes |
| March | — | lettuce, peas, spinach, radishes |
| April | tomatoes, peppers, beans, squash | lettuce, peas, spinach |
| May | tomatoes, peppers, beans, squash | garlic |
| June | beans, squash | beans, summer squash |
| July | beans, squash | tomatoes, peppers, beans, summer squash, winter squash |
| August | tomatoes, peppers, beans, squash | tomatoes, peppers, beans, summer squash, winter squash |
| September | tomatoes, peppers, beans, squash, fall brassicas, carrots | tomatoes, peppers, beans, summer squash, winter squash |
| October | — | tomatoes, peppers, beans, summer squash, winter squash |
| November | garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash |
| December | — | tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, carrots |
A year in weather
August is Thousand Oaks's warmest stretch (~70°F) and December its coldest (~56°F); precipitation crests in February at 2.9 inches and ebbs in August to 0.0 inches.
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 57° | 2.9″ | 4 |
| February | 57° | 2.9″ | 5 |
| March | 58° | 2.0″ | 3 |
| April | 60° | 0.6″ | 1 |
| May | 62° | 0.3″ | 1 |
| June | 66° | 0.1″ | 0 |
| July | 69° | 0.0″ | 0 |
| August | 70° | 0.0″ | 0 |
| September | 70° | 0.1″ | 0 |
| October | 65° | 0.5″ | 1 |
| November | 61° | 0.9″ | 2 |
| December | 56° | 1.7″ | 3 |
Regional context
Similar climates Casa Conejo, CA, Lake Sherwood, CA, Santa Rosa Valley, CA
Thousand Oaks swings from 57°F in January to 69°F in July (13°F) per NOAA NCEI 1991-2020 normals; precipitation in Thousand Oaks runs about 12 inches on roughly 19 measurable days.
Cool-season fronts carry Thousand Oaks's rain: February logs 2.9 inches on 4.5 days, against August's 0.0 inches on 0.0 — winter does the heavy lifting in Thousand Oaks. That cool-season-wet pattern aligns Thousand Oaks with places like Casa Conejo, CA, Lake Sherwood, CA and Santa Rosa Valley, CA.
Thousand Oaks reaches its last hard frost near January 24; that is the cue for lettuce, chard, arugula, and mustard greens. Tomatoes and peppers do best set out two weeks later in Thousand Oaks, once nights clear the mid-40s°F. Frost returns to Thousand Oaks near December 15, ending the tender-crop season. That date is a median: Thousand Oaks freezes sooner in half of years.
Similar climates: Casa Conejo, CA, Lake Sherwood, CA, Santa Rosa Valley, CA, Westlake Village, CA, Oak Park, CA.
Frequently asked
- When does it freeze in Thousand Oaks?
- Frost typically leaves Thousand Oaks by January 24 and returns to Thousand Oaks near December 15.
- What is the rainy season in Thousand Oaks?
- February is the wettest month in Thousand Oaks, about 2.9 inches on average; the year totals roughly 12 inches.
- What is the warmest month in Thousand Oaks?
- August is Thousand Oaks's warmest month, averaging about 70°F.
- What is the coldest month in Thousand Oaks?
- Thousand Oaks bottoms out in December, with a mean near 56°F.
- When can I start a vegetable garden in Thousand Oaks?
- Time tomatoes in Thousand Oaks for two weeks after January 24; peas and greens start at Thousand Oaks's frost line.
- How many rainy days does Thousand Oaks get?
- Thousand Oaks averages about 19 days with measurable rain or snow each year.
- What hardiness zone is Thousand Oaks?
- Thousand Oaks sits in the USDA zone set by December lows near 56°F; the USDA ZIP tool gives the band.
- What is the 10-day forecast for Thousand Oaks?
- Thousand Oaks's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
- Will it rain this week in Thousand Oaks?
- See this week's day-by-day rain chances for Thousand Oaks in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in Thousand Oaks?
- Current conditions for Thousand Oaks and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the Thousand Oaks forecast updated?
- The Thousand Oaks forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in Thousand Oaks?
- Today's sunrise and sunset times for Thousand Oaks are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
- How accurate is the weather forecast for Thousand Oaks?
- The next few days in Thousand Oaks's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
Thousand Oaks sits at 34.2°N; its climate zone is hot-summer Mediterranean (Köppen approximation).
ZIP codes in Thousand Oaks
- 91319
- 91320
- 91358
- 91359
- 91360
- 91361
- 91362