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Weather in Altadena, United States 🇺🇸

Weather Forecast in Altadena

Current Weather in Altadena

Heat Advisory issued July 8 at 8:56PM PDT until July 10 at 8:00PM PDT by NWS San Diego CA
Sunny
22°C
Feels like 24°C. Sunny.
🌬️ 4 km/h SW
💧 61% Humidity
🧭 1013 hPa
👁️ 16.0 km Visibility
☀️ UV Index: 1.6
🌡️ Dew Point: 12°C
🌅 Sunrise: 05:48 AM
🌇 Sunset: 08:07 PM
Map Overlays:

In Altadena right now it is 22°C and sunny, feeling like 24°C. Humidity is 61% with winds around 4 km/h, and the UV index is 2 (low). Over the next few days, temperatures in Altadena range from about 17°C to 36°C. ⚠️ Heat Advisory issued July 8 at 8:56PM PDT until July 10 at 8:00PM PDT by NWS San Diego CA

Hourly Forecast for Altadena

09:00
Sunny
24°
3%
10:00
Sunny
26°
2%
11:00
Sunny
32°
1%
12:00
Sunny
34°
1%
13:00
Sunny
35°
1%
14:00
Sunny
36°
1%
15:00
Sunny
35°
1%
16:00
Sunny
34°
1%
17:00
Sunny
32°
1%
18:00
Sunny
30°
1%
19:00
Sunny
27°
2%
20:00
Sunny
24°
4%
21:00
Clear
21°
7%
22:00
Clear
20°
9%
23:00
Clear
20°
2%
00:00
Clear
20°
2%
01:00
Clear
20°
2%
02:00
Clear
19°
2%
03:00
Clear
18°
2%
04:00
Clear
18°
2%
05:00
Clear
18°
2%
06:00
Sunny
18°
2%
07:00
Sunny
21°
1%
08:00
Sunny
26°
1%

14-Day Forecast for Altadena

Thu, Jul 09
Sunny Sunny
36° / 17°
Fri, Jul 10
Sunny Sunny
32° / 18°
Sat, Jul 11
Sunny Sunny
32° / 18°
Sun, Jul 12
Sunny Sunny
32° / 19°
Mon, Jul 13
Partly Cloudy Partly Cloudy
31° / 20°
Tue, Jul 14
Sunny Sunny
33° / 20°
Wed, Jul 15
Sunny Sunny
35° / 23°
Thu, Jul 16
Sunny Sunny
35° / 22°
Fri, Jul 17
Sunny Sunny
36° / 22°
Sat, Jul 18
Sunny Sunny
32° / 20°
Sun, Jul 19
Sunny Sunny
35° / 22°
Mon, Jul 20
Sunny Sunny
32° / 19°
Tue, Jul 21
Sunny Sunny
32° / 18°
Wed, Jul 22
Sunny Sunny
35° / 20°

Additional Forecasts for Altadena

Air Quality

💨 US EPA Index 2 (Moderate)
CO (Carbon Monoxide) 152.0 μg/m³
O₃ (Ozone) 51.0 μg/m³
NO₂ (Nitrogen Dioxide) 27.1 μg/m³
SO₂ (Sulphur Dioxide) 4.4 μg/m³
PM2.5 (Fine particles) 20.8 μg/m³
PM10 (Coarse particles) 26.3 μg/m³

Historical Weather

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Best Time to Be Outside in Altadena Today

The most comfortable window in Altadena today looks like 20:00 to 20:00, when it is around 24°C. It should stay dry through that window. No significant rain is expected in the next several hours.

Frequently Asked Questions about Weather in Altadena

What is the temperature in Altadena right now?

The current temperature in Altadena is 22°C (72°F), sunny (feels like 24°C).

What's the weather like in Altadena right now?

Conditions in Altadena right now: Sunny, humidity 61%, wind 4 km/h SW.

What is today's forecast for Altadena?

Today in Altadena: high 36°C, low 17°C, sunny. Chance of rain: 2%.

What is the 7-day weather forecast for Altadena?

Daily highs and lows for Altadena:

  • 2026-07-09: 36°C / 17°C
  • 2026-07-10: 32°C / 18°C
  • 2026-07-11: 32°C / 18°C
  • 2026-07-12: 32°C / 19°C
  • 2026-07-13: 31°C / 20°C
  • 2026-07-14: 33°C / 20°C
  • 2026-07-15: 35°C / 23°C
Is it going to rain in Altadena today?

There is a 2% chance of rain in Altadena today.

What is the wind speed in Altadena right now?

Wind in Altadena is currently 4 km/h (2 mph) from the SW.

What is the UV index in Altadena right now?

The UV index in Altadena is currently 1.6 (low). Sun protection is recommended when the index is 3 or higher.

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