Live Weather & Forecast

Weather in Altadena

California, United States · Real-time conditions & 3-day outlook

Flag of United States
Partly cloudy
15°C
Feels like 15°C
59°F / Feels 59°F
Partly cloudy
Altadena, California
🌞 Daytime
Updated: 2026-04-12 10:30
💧
Humidity
82%
💨
Wind
9.4 km/h S
🌬️
Wind Gust
14 km/h
🌡️
Pressure
1016 mb
👁️
Visibility
16 km
☀️
UV Index
1.1 (Low)
🌧️
Precipitation
9.01 mm
☁️
Cloud Cover
75%
💦
Dew Point
10.3°C
🌐
Wind Degree
182°

Air Quality Index

US EPA: Good UK DEFRA: Low (1)
CO
156.9 μg/m³
NO₂
9.1 μg/m³
O₃
101 μg/m³
SO₂
6 μg/m³
PM 2.5
8.7 μg/m³
PM 10
11 μg/m³

Weather Alerts 5

Met · Moderate · Expected
Winter Weather Advisory issued April 11 at 8:36PM PDT until April 13 at 11:00AM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Wet snow expected. Total snow accumulations up to around 6 inches above 6000 feet. Winds gusting as high as 45 mph. * WHERE...Eastern San Gabriel Mountains, Interstate 5 Corridor, and Western San Gabriel Mountains and Highway 14 Corridor. * WHEN...From 3 AM Sunday to 11 AM PDT Monday. * IMPACTS...The hazardous conditions could impact the Monday morning commute. Gusty winds could bring...

Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1.

Effective: 2026-04-11T20:36:00-07:00  ·  Expires: 2026-04-12T11:00:00-07:00
Met · Moderate · Expected
Wind Advisory issued April 11 at 7:00PM PDT until April 12 at 10:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Southwest winds 20 to 30 mph with gusts up to 45 mph expected. Isolated gusts to around 55 mph near Lake Palmdale. * WHERE...Antelope Valley Foothills. * WHEN...From 3 AM to 10 PM PDT Sunday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution.

Effective: 2026-04-11T19:00:00-07:00  ·  Expires: 2026-04-12T07:00:00-07:00
Met · Moderate · Expected
Special Weather Statement issued April 12 at 4:43AM PDT by NWS Los Angeles/Oxnard CA

At 442 AM PDT, Doppler radar was tracking gusty showers across portions of Ventura and Los Angeles Counties moving northeast at 25 mph. HAZARD...Wind gusts up to 40 mph. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Locations impacted include... Oxnard... Thousand Oaks... Simi Valley... Eastern Ventura... Camarillo... Fillmore......

If outdoors, consider seeking shelter inside a building.

Effective: 2026-04-12T04:43:00-07:00  ·  Expires: 2026-04-12T05:45:00-07:00
Met · Moderate · Expected
Winter Weather Advisory issued April 12 at 12:40AM PDT until April 13 at 11:00AM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Wet snow expected. Total snow accumulations up to around 6 inches above 6000 feet. Winds gusting as high as 45 mph. * WHERE...Eastern San Gabriel Mountains, Interstate 5 Corridor, and Western San Gabriel Mountains and Highway 14 Corridor. * WHEN...Until 11 AM PDT Monday. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Monday morning commute. Gust...

Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1.

Effective: 2026-04-12T00:40:00-07:00  ·  Expires: 2026-04-12T17:00:00-07:00
Met · Moderate · Expected
Wind Advisory issued April 12 at 12:39AM PDT until April 12 at 10:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Southwest winds 20 to 30 mph with gusts up to 45 mph expected. Isolated gusts to around 55 mph near Lake Palmdale. * WHERE...Eastern Antelope Valley Foothills and Western Antelope Valley Foothills. * WHEN...Until 10 PM PDT this evening. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution.

Effective: 2026-04-12T00:39:00-07:00  ·  Expires: 2026-04-12T22:00:00-07:00

Today's Hourly Forecast

24-hour breakdown for Altadena, California

12 AM
Cloudy
13°
Cloudy
💧 81% 💨 11.5 km/h
1 AM
Overcast
12°
Overcast
💧 79% 💨 13.3 km/h
2 AM
Light drizzle
12°
Light drizzle
💧 96% 💨 13.7 km/h 🌧️ 100%
3 AM
Patchy rain nearby
12°
Patchy rain nearby
💧 94% 💨 13 km/h 🌧️ 79%
4 AM
Mist
12°
Mist
💧 94% 💨 11.5 km/h
5 AM
Overcast
12°
Overcast
💧 93% 💨 11.2 km/h
6 AM
Overcast
12°
Overcast
💧 94% 💨 12.2 km/h
7 AM
Mist
12°
Mist
💧 95% 💨 11.5 km/h
8 AM
Patchy rain nearby
12°
Patchy rain nearby
💧 96% 💨 10.8 km/h 🌧️ 76%
9 AM
Light rain
12°
Light rain
💧 98% 💨 10.1 km/h 🌧️ 100%
10 AM
Partly cloudy
15°
Partly cloudy
💧 82% 💨 9.4 km/h 🌧️ 100%
11 AM
Patchy rain nearby
12°
Patchy rain nearby
💧 71% 💨 10.1 km/h 🌧️ 100%
12 PM
Patchy light drizzle
12°
Patchy light drizzle
💧 72% 💨 10.8 km/h 🌧️ 100%
1 PM
Patchy rain nearby
12°
Patchy rain nearby
💧 71% 💨 14 km/h 🌧️ 100%
2 PM
Patchy rain nearby
14°
Patchy rain nearby
💧 77% 💨 18.7 km/h 🌧️ 81%
3 PM
Partly Cloudy
15°
Partly Cloudy
💧 65% 💨 20.2 km/h
4 PM
Sunny
15°
Sunny
💧 59% 💨 22.3 km/h
5 PM
Sunny
15°
Sunny
💧 60% 💨 18 km/h
6 PM
Sunny
14°
Sunny
💧 63% 💨 15.5 km/h
7 PM
Sunny
12°
Sunny
💧 71% 💨 12.6 km/h
8 PM
Clear
11°
Clear
💧 74% 💨 9.4 km/h
9 PM
Partly Cloudy
10°
Partly Cloudy
💧 80% 💨 7.2 km/h
10 PM
Partly Cloudy
11°
Partly Cloudy
💧 82% 💨 6.5 km/h
11 PM
Partly Cloudy
10°
Partly Cloudy
💧 66% 💨 7.2 km/h

3-Day Forecast

Daily overview for Altadena, California

Today
Moderate rain
Moderate rain
15° / 10°
🌧️ 81% chance of rain
💧 Avg. humidity: 80%
💨 Max wind: 22.3 km/h
🌧️ Total precip: 12.45 mm
☀️ UV Index: 1.2
🌅 Sunrise: 06:25 AM
🌇 Sunset: 07:22 PM
🌙 Waning Crescent
🌑 Moon: 33% lit
Mon, Apr 13
Cloudy
Cloudy
13° / 8°
🌧️ 0% chance of rain
💧 Avg. humidity: 79%
💨 Max wind: 15.5 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.2
🌅 Sunrise: 06:23 AM
🌇 Sunset: 07:23 PM
🌙 Waning Crescent
🌑 Moon: 23% lit
Tue, Apr 14
Sunny
Sunny
20° / 6°
🌧️ 0% chance of rain
💧 Avg. humidity: 67%
💨 Max wind: 14 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.8
🌅 Sunrise: 06:22 AM
🌇 Sunset: 07:24 PM
🌙 Waning Crescent
🌑 Moon: 15% lit

Best Time to Visit Altadena

Plan your trip to Altadena, United States around the most favorable weather conditions.

Peak Season
June – September
Warm, dry summers — ideal for outdoor activities.
Shoulder Season
April – May, October
Fewer crowds, moderate prices, mild weather.
Off Season
November – March
Cooler temperatures; some regions may experience rain or snow.
← Back to Altadena 🗓 View Holidays 2026

Frequently Asked Questions

What is the current weather in Altadena?
Current conditions in Altadena: Partly cloudy, temperature 15°C, humidity 82%.
What is the best time to visit Altadena?
The best time to visit Altadena is typically June – September. Warm, dry summers — ideal for outdoor activities.
What is the climate like in Altadena?
Altadena is located at approximately 34.2° latitude. It has a temperate climate with warm summers and cold winters.
Does it rain a lot in Altadena?
The wettest period in Altadena is typically during November – March. Cooler temperatures; some regions may experience rain or snow.
What should I pack for a trip to Altadena?
For visits to Altadena during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.
What country is Altadena in?
Altadena is located in United States, in the state of California.
What are the public holidays in Altadena in 2026?
View the 2026 public holidays for Altadena on our Holidays page.
What are the GPS coordinates used for the weather forecast in Altadena?
The weather forecast for Altadena uses coordinates 34.1899, -118.1317.