Ventura County · Lifestyle
Year-round climate, microclimates by city, May Gray and Santa Anas, and what to expect from each Ventura County season.
Jason Walters, REALTOR® — 22 years in Ventura County. Last reviewed 2026-05-04.
Ventura County's weather is one of its biggest selling points — and one of its more nuanced features. The county spans 30 miles of coastline plus inland valleys, producing meaningfully different microclimates within a single county. Understanding the patterns helps you pick the right city for your climate preferences and avoid surprise from seasonal phenomena like May Gray, Santa Ana winds, and the occasional fire-risk events.
This guide covers each season, the city-by-city microclimate variation, the named weather phenomena (May Gray, June Gloom, Santa Anas), and the overall climate patterns Ventura County buyers should know.
Mild, transitional
Temperatures rise from 60s to 70s. Late spring brings May Gray (low coastal cloud cover that often persists into mid-morning). Coastal cities (Ventura, Oxnard) are cooler than inland (Thousand Oaks, Simi Valley); the spread can be 10-15°F by late May.
Warm and dry
June Gloom continues at the coast through early-to-mid June. By July and August, the marine layer thins and most days are sunny coast-to-inland. Inland cities run hot (90s common in Thousand Oaks, Simi Valley, Moorpark, Ojai); coastal cities stay mild (70-80°F highs).
Warm with Santa Ana wind events
September is often the warmest month overall — the marine layer weakens and inland heat reaches the coast. October and November bring Santa Ana wind events: hot, dry winds from the inland deserts producing fire-risk weather. Most fire-risk PSPS (Public Safety Power Shutoff) events happen in this window.
Mild and wet
Winter is the wet season. Annual rainfall (10-22 inches by city) concentrates here, mostly between November and March. Temperatures stay mild — highs in the 60s, lows in the 40s. Snow is essentially never a factor (Ojai foothills occasionally see flurries above 4,000 ft).
Coastal — mild year-round
Most consistently moderate climate in the county. Summer highs 70-80°F, winter lows 45-55°F. May Gray and June Gloom can persist longer than other coastal cities. Annual rainfall ~17 inches.
Coastal — mild but more fog
Similar to Ventura but with more morning fog days. Naval base areas can stay foggy until midday. Annual rainfall ~14 inches. Summer highs 70-80°F.
Coastal-influenced — mild with sun
Inland enough to clear May Gray faster than Oxnard but still cooled by coastal influence. Summer highs 75-85°F, winter lows 45-55°F. Annual rainfall ~16 inches.
Inland Conejo Valley — warm summers
Inland enough to be meaningfully warmer than coastal cities. Summer highs 85-95°F common; winter lows 35-45°F. Less coastal fog. Annual rainfall ~17 inches. Santa Ana wind events more pronounced than coastal.
Inland — hot summers, cooler winters
Behind the Santa Susana Mountains, more continental climate than coastal cities. Summer highs 90-100°F common; winter lows 35-45°F. Annual rainfall ~14 inches. Santa Ana wind funnel — among the more wind-prone Ventura County cities.
Inland — similar to Conejo Valley
Inland climate similar to Thousand Oaks but slightly cooler. Summer highs 85-95°F; winter lows 38-48°F. Annual rainfall ~15 inches.
Inland valley — warmest in summer
Surrounded by mountains, Ojai has the warmest inland climate in the county. Summer highs frequently 90-100°F; winter lows 35-45°F (occasionally below freezing in the valley floor). Annual rainfall ~22 inches — the wettest part of the county. Famous for the 'pink moment' alpenglow on the Topa Topa Mountains at sunset.
Inland eastern Conejo Valley
Similar to Thousand Oaks climate. Summer highs 85-95°F; winter lows 35-45°F. Annual rainfall ~17 inches. PSPS-eligible during Santa Ana wind events in some sections.
Coastal — mild with strong marine influence
Most consistently cool coastal city in the county. Summer highs 65-75°F (rarely above 80); winter lows 50-58°F. Annual rainfall ~14 inches. The closest to year-round 'San Francisco-like' climate in Southern California.
Spring marine layer that produces low cloud cover at coastal cities (Ventura, Oxnard, parts of Camarillo) typically lasting from morning through mid-day, then clearing. Pronounced in May and June. Inland cities are unaffected. Buyers from sunnier regions sometimes underestimate how persistent the cloud cover can be — one of the more common 'I didn't know this' surprises among new Ventura County residents.
Hot, dry winds blowing from the inland deserts toward the coast, typically October-November but possible any time of year. Wind speeds 30-60+ mph in funnel locations (Simi Valley, eastern Camarillo, Ojai). Lower humidity and higher temperatures than typical conditions. Major fire-risk driver; PSPS events typically tied to Santa Ana conditions.
Coastal stratus cloud layer that forms overnight as moist Pacific air flows inland. Most pronounced May-July; can persist all day during May Gray events. Provides natural air conditioning for coastal cities; the reason summer highs at the coast stay 10-15°F below inland.
Sunset alpenglow on the Topa Topa Mountains east of Ojai — granite faces catch the setting sun and turn pink for 5-10 minutes daily. Visible from most of the Ojai valley and one of the city's defining natural features. Photographers travel from out of state for this phenomenon.
Preemptive power shutoffs by Southern California Edison during high-wind, high-fire-risk weather. Typically affects foothill and canyon neighborhoods (eastern Camarillo, parts of Simi Valley, Ojai foothills, Oak Park edges). Verify PSPS eligibility for any specific address during inspection — it affects insurance availability and daily life during fire-risk events.
Good to know
Mild Mediterranean year-round. Summer highs 70-95°F (coastal-to-inland), winter lows 40-55°F. Annual rainfall 10-22 inches concentrated November-March. No extreme cold, very low humidity by national standards, no snow at most elevations. Coastal cities are 10-15°F cooler than inland in summer.
Persistent low marine-layer cloud cover at coastal cities during May and June. Coastal cities (Ventura, Oxnard) experience overcast mornings often lasting until 11am-1pm before clearing. Inland cities (Thousand Oaks, Simi Valley, Moorpark, Ojai) clear faster or aren't affected. Buyers from sunny climates sometimes underestimate how persistent the cloud cover can be.
Yes — Santa Ana wind events typically October-November, occasionally other times of year. Wind speeds 30-60+ mph in funnel locations (Simi Valley, eastern Camarillo, Ojai). Major fire-risk driver and the cause of most regional PSPS (Public Safety Power Shutoff) events. Verify PSPS eligibility for any specific address during inspection.
Subjective. For most consistent coastal moderation: Ventura. For warm inland sunshine with less fog: Camarillo. For the warmest summers: Ojai. For year-round San Francisco-like cool: Port Hueneme. Pick the climate that matches your preference; Ventura County offers real microclimate variation across its 30+ miles of coastline and inland valleys.
Essentially never at most elevations. Ojai foothills above ~4,000 ft occasionally see flurries during winter storms; the valley floors of all major cities receive no snowfall in typical years. The Topa Topa Mountains and other higher peaks can have snow caps for short periods after winter storms.
Annual rainfall ranges 10-22 inches by city. Ojai is the wettest (~22 inches); Port Hueneme and Oxnard are among the driest (~14 inches). Rainfall is concentrated November through March, with summer being essentially rain-free. Storms typically 1-3 days, with rapid clearing and lots of sunshine between events.
Yes, like most California regions. Trends include hotter summers (more days above 90°F inland), drier average rainfall years, increased Santa Ana wind frequency and intensity, and elevated fire risk. Specific impacts vary by neighborhood; foothill and canyon neighborhoods carry more fire risk than urban core. Insurance availability has tightened in some high-risk zones over the last several years.
The eastern foothills around Ojai receive the most rainfall (~22 inches annually) due to orographic uplift against the Topa Topa Mountains. The Conejo Valley (Thousand Oaks, Newbury Park) is also relatively wet (~17 inches). Coastal cities receive less due to the marine layer's stabilizing effect on storms; Port Hueneme is among the driest spots in the county at ~14 inches.
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Jason Walters, REALTOR®. California DRE #01467130. Walters Group Real Estate, eXp Realty of California, Inc., DRE #01878277.