Today’s Forecast:
⚠️
Heat Advisory
Heat Advisory issued July 23 at 10:14AM PDT until July 27 at 8:00PM PDT by NWS San Diego CA (Expires: July 27, 2026 10:00 pm)
Show Alert Details & Instructions
Description:
* WHAT...High temperatures as hot as the 90s to low 100s, and low
temperatures as warm as the 70s and lower 80s below 6500 feet
through Sunday expected.
* WHERE...Riverside County Mountains and San Bernardino County
Mountains.
* WHEN...Until 8 PM PDT Monday.
* IMPACTS...Hot temperatures may cause heat illnesses.
Instructions:
Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.
⚠️
Air Quality Alert
Air Quality Alert issued July 22 at 5:41PM PDT by NWS San Diego CA (Expires: July 23, 2026 7:45 pm)
Show Alert Details & Instructions
Description:
* WHAT...The South Coast AQMD has issued an air quality alert due to
harmful levels of ozone pollution.
Visit https://www.aqmd.gov/alertinfo to check current and forecasted
air quality levels.
* WHERE...in the South Coast Air Basin and Coachella Valley. Levels
of ozone pollution can vary by time and location depending on
emissions and air pollution transport.
* WHEN...until 8 PM Monday. The highest ozone levels typically occur
in the afternoon and early-evening hours.
* IMPACTS... Ozone air pollution can cause serious health problems,
including trouble breathing, asthma attacks, and lung damage.
Everyone can be affected, but sensitive groups such as people with
lung disease, older adults, people who are pregnant, children, and
those who spend a lot of time outdoors are at greater risk.
Instructions:
To protect your health, check air quality levels and act as needed:
* When Air Quality Index (AQI) levels are "Unhealthy for
Sensitive Groups" (orange), sensitive groups as specified
above should limit extended or intense outdoor activity.
* When AQI is "Unhealthy" (red), everyone may experience health
impacts. Sensitive groups should avoid extended time outdoors.
* When AQI is "Very Unhealthy" (purple), sensitive groups should
avoid all outdoor physical activity. Everyone else should
avoid extended or intense outdoor activity.
* When AQI is "Hazardous" (maroon), everyone should avoid all
outdoor physical activity.
* ADDITIONAL DETAILS...
To help keep indoor air clean when air quality is poor:
* Keep windows and doors closed
* Run your air conditioner and/or an air purifier
* Do not use whole house fans or swamp coolers that bring in
outside air if you have other methods to stay cool
* Avoid other sources of pollution such as fireplaces, candles,
incense, and grilling
To help minimize outdoor ozone air pollution levels:
* Limit the use of gasoline powered lawn and garden equipment
until evening hours
* Try to delay trips to the gas station and the use of household
chemicals until the evening
⚠️
Air Quality Alert
Air Quality Alert issued July 22 at 5:40PM PDT by NWS San Diego CA (Expires: July 23, 2026 7:45 pm)
Show Alert Details & Instructions
Description:
* WHAT...The South Coast AQMD has issued an air quality alert due to
harmful levels of ozone pollution.
Visit https://www.aqmd.gov/alertinfo to check current and forecasted
air quality levels.
* WHERE...in the South Coast Air Basin and Coachella Valley. Levels
of ozone pollution can vary by time and location depending on
emissions and air pollution transport.
* WHEN...until 8 PM Monday. The highest ozone levels typically occur
in the afternoon and early-evening hours.
* IMPACTS... Ozone air pollution can cause serious health problems,
including trouble breathing, asthma attacks, and lung damage.
Everyone can be affected, but sensitive groups such as people with
lung disease, older adults, people who are pregnant, children, and
those who spend a lot of time outdoors are at greater risk.
Instructions:
To protect your health, check air quality levels and act as needed:
* When Air Quality Index (AQI) levels are "Unhealthy for
Sensitive Groups" (orange), sensitive groups as specified
above should limit extended or intense outdoor activity.
* When AQI is "Unhealthy" (red), everyone may experience health
impacts. Sensitive groups should avoid extended time outdoors.
* When AQI is "Very Unhealthy" (purple), sensitive groups should
avoid all outdoor physical activity. Everyone else should
avoid extended or intense outdoor activity.
* When AQI is "Hazardous" (maroon), everyone should avoid all
outdoor physical activity.
* ADDITIONAL DETAILS...
To help keep indoor air clean when air quality is poor:
* Keep windows and doors closed
* Run your air conditioner and/or an air purifier
* Do not use whole house fans or swamp coolers that bring in
outside air if you have other methods to stay cool
* Avoid other sources of pollution such as fireplaces, candles,
incense, and grilling
To help minimize outdoor ozone air pollution levels:
* Limit the use of gasoline powered lawn and garden equipment
until evening hours
* Try to delay trips to the gas station and the use of household
chemicals until the evening
This Afternoon:Sunny, with a high near 87. South wind 10 to 15 mph, with gusts as high as 25 mph.
Tonight:Mostly clear, with a low around 74. South wind 5 to 15 mph, with gusts as high as 25 mph.
Friday:Sunny, with a high near 87. South wind 5 to 15 mph, with gusts as high as 25 mph.
Today’s Report:
Not Recommended for hiking. High near 85°F. Low rain risk (3%). Light wind (15 mph).
-
Temp: Marginal weather factor
-
Rain: Favorable conditions
-
Wind: Favorable conditions
-
Thunderstorm: Favorable conditions
-
Alert: Unfavorable weather factor
⚠️ Active weather alerts affect this activity!
Tomorrow's Outlook:
Not Recommended
23/100
Not Recommended for biking. High near 85°F. Low rain risk (3%). Breezy winds (15 mph).
-
Temp: Marginal weather factor
-
Rain: Favorable conditions
-
Wind: Marginal weather factor
-
Thunderstorm: Favorable conditions
-
Alert: Unfavorable weather factor
⚠️ Active weather alerts affect this activity!
Tomorrow's Outlook:
Not Recommended
24/100
Use Caution for outdoor events / activities. High near 85°F. Low rain risk (3%). Breezy winds (15 mph).
-
Temp: Marginal weather factor
-
Rain: Favorable conditions
-
Wind: Marginal weather factor
-
Thunderstorm: Favorable conditions
Tomorrow's Outlook:
Use Caution
46/100
About Lake Arrowhead
Lake Arrowhead is an outdoor-planning page for Lake Arrowhead and the western San Bernardino Mountains. It has a distinct purpose centered on mountain-road access, snow, fog, cold nights, thunderstorms, smoke, and events, with the forecast used to choose the safest and most comfortable version of the day.
Make the Most of a Lake Arrowhead Day
Start by comparing conditions across Lake Arrowhead, Blue Jay, and the rest of the coverage area. Choose among hiking, biking, outdoor events based on wind, precipitation, temperature, visibility, water or trail conditions, road access, smoke, and available daylight.
Weather Tips for Lake Arrowhead
- Conditions around Lake Arrowhead and the western San Bernardino Mountains can differ sharply from nearby towns; mountain-road access, snow, fog, cold nights, thunderstorms, smoke, and events are the main planning variables.
- For biking, compare wind, pavement or trail surface, heat, visibility, traffic, smoke, and recent rain before choosing distance and exposure.
- Check elevation-specific forecasts, snow and ice, chain controls, seasonal roads, cold nights, thunderstorms, wildfire smoke, and shoulder-season closures.
- Crowds and parking can narrow the useful weather window, so arrive early and keep a lower-commitment nearby option.
Nearby Towns and Areas
This page covers Lake Arrowhead and the western San Bernardino Mountains. It can also be useful when planning outdoor time near:
- Blue Jay
- Rimforest
- Crestline
- Lake Gregory
- Running Springs
- Rim of the World Highway
Plan Around the Conditions
Use the forecast to choose the best version of Lake Arrowhead rather than forcing one itinerary. A shorter route, earlier launch, sheltered shoreline, lower-elevation trail, or town-based backup can preserve the day when conditions change.
7-Day Forecast for Lake Arrowhead
Lake Arrowhead Weather by Season
Winter
At Lake Arrowhead, winter brings snow, ice, chain controls, closed roads, and limited trail access. Conditions vary sharply by elevation, and cold nights or storms can make short trips more serious than valley forecasts suggest.
Spring
Around Lake Arrowhead and the western San Bernardino Mountains, spring is a long shoulder season with lingering snow, mud, icy mornings, and roads or campgrounds opening in stages. Lower trails may be usable well before the high country.
Summer
For mountain-road access, snow, fog, cold nights, thunderstorms, smoke, and events, summer opens the broadest access, but high-elevation sun, cold nights, afternoon thunderstorms, wildfire smoke, and fire restrictions remain central. Finish exposed ridges before storms build.
Fall
Near Lake Arrowhead and the surrounding area, early fall can provide crisp hiking and biking weather, followed by freezing nights and the first snow. Services and roads may close before lower elevations feel wintry.
Key Climate Data Points
- Warmest months: July and August at higher elevations.
- Coolest months: December through February.
- Wettest season: November through April, much of it as snow.
- Driest season: July through September.
- Best outdoor window: Mid-summer through early fall after roads open and before persistent snow.
