Santiago CanyonOSYC1
At a river or reservoir gauge/2.4 mi away/1,686 ft/320 ft above here
temp, wind, gust, humidity, pressure
Weather/California/Williams Canyon
Williams Canyon, California
Community in Orange County, CaliforniaHeat Advisory, in full · Every severe alert
* WHAT...For the Wind Advisory, northeast winds 20 to 30 mph with gusts 35 to 55 mph expected. Strongest winds will be near the foothills and in canyons of the Santa Ana mountains, with gusts up to 70 mph possible. For the Heat Advisory, temperatures up to 95 degrees * WHERE...Orange County Inland Areas. * WHEN...For the Heat Advisory, until 8 PM PDT Saturday. For the Wind Advisory, until noon PDT Saturday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. Moderate to locally major HeatRisk. Those sensitive to heat may be impacted.
Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.
76°
90°/59°
Clear·
Feels like 76°·Strong breeze 27 mph NE
Alert. A Heat Advisory is in force for Williams Canyon until 8 PM Saturday. 1 more alert is in force here as well. Read the alert in full, and see what it means in the Field Book.
Now. Williams Canyon is 76° and clear at 10 PM. The dew point is 37°, so the air feels dry and comfortable. Strong breeze from the northeast at 27 mph.
Today and tonight. Tonight falls to about 68° by 6 AM, under a mostly clear sky. No rain is expected for the rest of the day.
The week. The warmest day ahead is tomorrow, near 90°, and the coolest Wednesday, near 67°. Rain is likely Tuesday (57%) and Wednesday (67%). The windiest day is tomorrow, with wind to 26 mph.
The sky now. The Moon is a waxing crescent, 26% lit, and stays below the horizon until dawn. The next full Moon is Sunday, Oct 25. Look for Saturn, bright in the southeast. A planet shines with a steady light where the stars around it twinkle. The Orionids meteor shower is active, peaking around Oct 21: at its peak, up to about 20 meteors an hour can be seen from a dark site. The sky is forecast to stay clear: a good night to look up. The day is 11 hours 23 minutes long, 2 minutes shorter than yesterday.
0UV Low
38Air quality
20%Humidity
0%Cloud
Now
10:00 PM
76feels76
27mph
Today
Oct 15
9059
25mph
UV 7
Fri
Oct 16
9067
26mph
UV 7
Sat
Oct 17
8871
18mph
UV 6
Sun
Oct 18
8564
UV 7
Mon
Oct 19
8163
UV 7
Tue
Oct 20
7158
57%
13mph
Wed
Oct 21
6754
67%
76°
90°59°
90°67°
88°71°
85°64°
81°63°
71°58°
67°54°
As of 10:00 PM in Williams Canyon, California.
Air quality
The air at Williams Canyon
Index 38, good, led by ozone. Read at 9 PM from its reporting area, Saddleback Vly (CA), 7 miles off.
38Good
- Fine particles (PM2.5)3Good18.1 mi
- Ozone38Good45 ppb7.2 mi
- Coarse particles (PM10)12Good7.2 mi
- Nitrogen dioxide4Good4.8 ppb17.2 mi
- Sulfur dioxide0Good0 ppb22.6 mi
- Carbon monoxide-0.2 ppm17.2 mi
The days ahead
Highest 65, moderate, Fri Oct 16, led by ozone. Yesterday measured 50, good.
GoodModerate
- 50YesterdayOct 14
- 46TodayOct 15
- 65FriOct 16
Smoke, the next 44 hours
Little smoke near the ground through Sat 5 PM: the index from smoke stays at 17 or under.
Precipitation
What has fallen at Williams Canyon
None in the last 3 days, to Thu 9 PM. Measured by radar and rain gauges, as water.
- Last 24 hours
- 0.00in
- Last 3 days
- 0.00in
Visibility
How far you can see at Williams Canyon, the next 44 hours
Visibility stays 10 miles or more through Sat 5 PM.
F
Now, today, and the week
On the radar over Williams Canyon, CaliforniaReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture
Weather instrument stations by state
What is measuring near here
The 7 instruments nearest Williams Canyon, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.7 miles away.
measured now5 instruments
Rank2,676of 4,465
Citizen station FW0117FW0117
In a volunteer observer's own ground/6.2 mi away/700 ft/666 ft below here
temp, humidity, wind, precip, pressure
CoronaAJO
At an airfield/11.8 mi away/533 ft/833 ft below here
temp, wind, gust, visibility, precip, pressure
I-15 : Jurupa AvenueCF174
Beside a road/22.6 mi away/908 ft/458 ft below here
temp, pavement temp, wind, visibility, precip
Fallbrook 5 NE53151
At a climate reference station/33.3 mi away/1,140 ft/226 ft below here
temp, humidity, wind, solar, precip
measured daily2 instruments
Silverado 1.0 ESECA-OR-6
In a volunteer observer's own ground/1.7 mi away/1,394 ft/28 ft above here
precip, snowfall, snow depth
Irvine RanchIVRC1
On a farm or research station/4.7 mi away/535 ft/831 ft below here
snowfall, snow depth, precip, high, low
Station report
The weather at Corona, drawn
The nearest airport reporting now, 11.8 mi from Williams Canyon, California. From its report of Oct 15, 2026, 8:56 PM local time: 3 of its 6 sheets.
The sky
No cloud below 12,000 ft; visibility 10 mi or more.
The air
81.0 F with a dew point of 38.0 F, 21 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 9,700 ft up.
The wind
From the east (90 degrees) at 9 mph: force 3, a gentle breeze on the Beaufort scale. The strongest gust today was 37 mph.
The full report of Corona, in 6 sheets, each beside the Field Book plates that explain it
What the snow tracker reads here
Every instrument in this state
-
Snow on the ground
Elsewhere in California
33 places, each with its own forecast and its own instruments.
Big Bear Mountainski areaBishopcityBridgeporttownChina Peakski areaDodge Ridgeski areaDonner PassfeatureFresnocityHeavenlysurveyed ski areaHomewoodski areaJune Mountainski areaKirkwoodsurveyed ski areaLos AngelescityMammoth LakestownMammoth Mountainsurveyed ski areaMount ShastafeatureMount Shasta CitycityMount Shasta Ski Parkski areaMount WhitneyfeatureMountain Highski areaNorthstarsurveyed ski areaPalisades Tahoesurveyed ski areaReddingcitySacramentocitySan DiegocitySan FranciscocitySierra NevadafeatureSierra-at-Tahoeski areaSnow Valleyski areaSouth Lake TahoecitySugar Bowlski areaSusanvillecityTruckeetownYosemitefeature
Near Williams Canyon
The nearest places, each with its own forecast and the instruments nearest it.
- Silveradocommunity, 1 mi
- Modjeskacommunity, 2 mi
- Trabuco Canyoncommunity, 5 mi
- Lake Forestcity, 6 mi
- Rancho Santa Margaritacity, 7 mi
- Mission Viejocity, 8 mi
- Irvinecity, 9 mi
- North Tustincommunity, 9 mi
- Laguna Woodscity, 9 mi
- Las Florescommunity, 10 mi
- Laguna Hillscity, 10 mi
- El Cerritocommunity, 10 mi