In a volunteer observer's own ground/1.8 mi away/332 ft/344 ft below here
temp, humidity, wind, precip, pressure
Parks/California/John Muir National Historic Site
John Muir National Historic Site, California
National Historic Site in Contra Costa County, California* WHAT...Hot conditions with maximum temperatures in the mid-90s to near 105. Mild minimum temperatures and weak onshore flow will limit overnight relief. * WHERE...The East Bay and San Francisco Bay Shoreline, North Bay Interior Mountains and Valleys, The Santa Clara Valley and Eastern Hills, The Santa Cruz Mountains, Interior Monterey County and the Santa Lucia Range, Most of San Benito County and the Cholame Hills in Southeast Monterey County, and Southern Salinas Valley/Arroyo Seco and Lake San Antonio. * WHEN...Until 10 PM PDT Thursday. * IMPACTS...This level of heat affects anyone without effective cooling and/or adequate hydration. Impacts likely in some health systems, heat-sensitive industries and infrastructure.
Hydration is a critical piece to surviving the heat. Drink water, and if possible, take water to those who are vulnerable. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to the early morning or evening. Take action when you experience symptoms of heat exhaustion and/or heat stroke. Beat the heat and check the backseat! Do not leave young children or pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.
82°
97°/64°
Clear·
Feels like 81°·Light air 1 mph WSW
Alert. A Heat Advisory is in force for John Muir National Historic Site until 10 PM Thursday. Read the alert in full, and see what it means in the Field Book.
Now. John Muir National Historic Site is 82° and clear at 8 PM. The dew point is 51°, so the air feels dry and comfortable. Light air from the west-southwest at 1 mph.
Today and tonight. Tonight falls to about 65° by 7 AM, under a mostly clear sky. No rain is expected for the rest of the day. Air quality is moderate (index 64): fine for most people, though people unusually sensitive to air pollution may feel it outdoors.
The week. The warmest day ahead is Wednesday, near 96°, and the coolest Saturday, near 76°. The days ahead look dry. Wednesday is hot, 96°: heat is a danger to anyone outdoors for long.
The sky now. The Moon is a waning crescent, 23% lit, and rises at 2:49 AM after midnight. The next new Moon is Saturday, Oct 10. Look for Saturn, bright in the east-southeast. A planet shines with a steady light where the stars around it twinkle. The sky is forecast to stay clear: a good night to look up. The day is 11 hours 38 minutes long, 2 minutes shorter than yesterday.
0UV Low
64Air quality
35%Humidity
1%Cloud
Now
8:00 PM
82feels81
now, clear
Today
Oct 5
9764
clear day
Wed
Oct 7
9663
UV 7
Thu
Oct 8
9661
UV 7
Fri
Oct 9
8663
UV 7
Sat
Oct 10
7660
14mph
UV 7
Sun
Oct 11
7655
UV 6
Mon
Oct 12
7955
UV 6
82°
97°64°
96°63°
96°61°
86°63°
76°60°
76°55°
79°55°
As of 8:00 PM in John Muir National Historic Site, California.
Air quality
The air at John Muir National Historic Site
Index 64, moderate, led by ozone. Read at 8 PM from its reporting area, Concord (CA), 5 miles off.
64Moderate
- Fine particles (PM2.5)-12.3 mi
- Ozone64Moderate17 ppb12.3 mi
- Nitrogen dioxide6Good6.7 ppb12.3 mi
- Sulfur dioxide0Good0.4 ppb12.9 mi
- Carbon monoxide-0.5 ppm12.3 mi
The days ahead
Highest 101, unhealthy for sensitive groups, today, led by ozone. Yesterday measured 67, moderate.
GoodModerateSensitive groups
- 67YesterdayOct 4
- 101TodayOct 5
- 97TueOct 6
- ModerateWedOct 7
- ModerateThuOct 8
- ModerateFriOct 9
- GoodSatOct 10
Smoke, the next 46 hours
Little smoke near the ground through Wed 5 PM: the index from smoke stays at 17 or under.
Precipitation
What has fallen at John Muir National Historic Site
None in the last 3 days, to Mon 7 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 John Muir National Historic Site, the next 46 hours
Visibility stays 10 miles or more through Wed 5 PM.
F
Now, today, and the week
Weather instrument stations by state
Park
- Designation
- National Historic Site
- Area
- 0.6 sq mi
- Height at its point
- 676 ft
- County
- Contra Costa County
- State
- California
- Latitude
- 37.9817° N
- Longitude
- 122.1337° W
What is measuring near here
The 6 instruments nearest John Muir National Historic Site, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.6 miles away.
measured now4 instruments
Briones RAWSPLEC1
A remote fire weather station/3.4 mi away/1,369 ft/693 ft above here
temp, wind, gust, humidity, pressure
At an airfield/4.5 mi away/16 ft/660 ft below here
temp, wind, gust, visibility, precip, pressure
SR-12 - SR-160CF105
Beside a road/27.6 mi away/-6 ft/682 ft below here
temp, pavement temp, wind, visibility, precip
measured daily2 instruments
Martinez 2.2 SWCA-CC-11
In a volunteer observer's own ground/0.6 mi away/692 ft/16 ft above here
precip, snowfall, snow depth
VallejoVLJC1
At a cooperative observer's station/8.7 mi away/362 ft/314 ft below here
snowfall, snow depth, precip, high, low
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 John Muir National Historic Site
The nearest places, each with its own forecast and the instruments nearest it.
- Alhambra Valleycommunity, 1 mi
- Martinezcity, 2 mi
- Mountain Viewcommunity, 2 mi
- Vine Hillcommunity, 3 mi
- Pachecocommunity, 3 mi
- Reliez Valleycommunity, 4 mi
- Pleasant Hillcity, 4 mi
- Port Costacommunity, 5 mi
- Contra Costa Centrecommunity, 6 mi
- Acalanes Ridgecommunity, 6 mi
- Beniciacity, 6 mi
- Lafayettecity, 6 mi
Parks near John Muir National Historic Site
- Benicia Capitol State Historic Park5 mi
- Port Chicago Naval Magazine National Memorial8 mi
- Eugene O'Neill National Historic Site12 mi
- McLaughlin Eastshore State Park13 mi
- Rosie the Riveter/World War II Home Front National Historical Park14 mi
- Mount Diablo State Park17 mi
- Angel Island State Park18 mi
- China Camp State Park19 mi