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Altadena, CA Weather
Current conditions
Forecast for this hour (no station report in the last two hours)
Forecast
10-day-
Wednesday Night
Rain before 11pm, then rain and a slight chance of thunderstorms. Cloudy, with a low around 57. Southeast wind 5 to 10 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
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Thursday
Rain and a slight chance of thunderstorms before 5pm, then a chance of rain showers. Mostly cloudy, with a high near 66. South wind 0 to 5 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
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Thursday Night
A chance of rain showers before 11pm. Partly cloudy, with a low around 52. West northwest wind around 0 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
National Weather Service forecast updated 1 day ago.
Hourly
Hourly forecast- Now60°97%
- 5 AM61°97%
- 6 AM60°97%
- 7 AM60°97%
- 8 AM60°97%
- 9 AM60°97%
- 10 AM61°97%
- 11 AM61°92%
- 12 PM62°92%
- 1 PM63°92%
- 2 PM64°92%
- 3 PM64°92%
- 4 PM64°92%
- 5 PM63°29%
- 6 PM62°29%
- 7 PM60°29%
- 8 PM59°29%
- 9 PM58°29%
- 10 PM58°29%
- 11 PM58°
- Fri12 AM58°
- 1 AM57°
- 2 AM57°
- 3 AM57°
10-day forecast
Details- TonightOct 20Partly Cloudy58°
- WedOct 21Rain97%57°73°
- TodayOct 22Rain97%52°66°
- FriOct 23Sunny53°71°
- SatOct 24Sunny57°76°
- SunOct 25Sunny58°78°
- MonOct 26Sunny59°79°
- TueOct 27Mostly Sunny78°
- WedOct 28Cloudy68°82°
- ThuOct 29Cloudy62°80°
Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.
Radar
Full mapWeather news near Altadena
More weather news-
Southern California's wild weather swings continue. Next up, rainSouthern California is likely in for a solid dose of rain this week, just days after heat and Santa Ana winds helped fuel several wildfires across the region. Forecasters expect the bulk of the rain to roll into the Los…
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Satellite image of southwest U.S. at 17:20 UTC on October 20, 2026. Credit: NOAA/GOES-19, Zoom Earth, The Watchers The WPC Excessive Rainfall Discussion issued at 15:33 UTC on October 20 places portions of Southern…
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Incoming Storm Could Bring Up to 3 Inches of Rain to SouthlandA strong October storm was moving toward Southern California Tuesday, with forecasters warning of widespread rain, possible thunderstorms and an increasing risk of localized flooding. “The system is starting to turn the…
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Storm Could Bring Up to 2 Inches of Rain to SouthlandA strong October storm was moving toward Southern California Tuesday, with forecasters warning of widespread rain, possible thunderstorms and an increasing risk of localized flooding. The National Weather Service said…
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October Storm Could Bring Up to 2 Inches of Rain to SouthlandA strong October storm was moving toward Southern California Tuesday, with forecasters warning of widespread rain, possible thunderstorms and an increasing risk of localized flooding. The National Weather Service said…
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Rain — and potentially lots of it — heading to Southern CaliforniaWidespread rain and possible thunderstorms are headed for Southern California this week, with forecasters on Monday warning that some areas could receive up to 2 inches of rain. The National Weather Service said a…
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Cooldown with a chance of rain‘Mostly beneficial’ showers are possible midweek, followed by a weekend warm-up. VOLUNTEERS wait for parishioners at St. Joseph Catholic Church in Placentia. (ROBERT GAUTHIER Los Angeles Times) It’s time to grab those…
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California storms could bring much-needed rain and relief to wildfire-weary areas🔥 FIRE RELIEF: Wet weather is headed for California just in time as wildfires rage across the state, bringing much-needed relief to the fiery conditions this week. CALIFORNIA - As numerous wildfires burn across parts of…
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Santa Ana winds to intensify across Los Angeles CountyLOS ANGELES — Powerful Santa Ana winds were expected to reach their peak Friday across Los Angeles County, with forecasters warning of mountain gusts potentially reaching 90 mph, temperatures approaching 100 degrees and…
Air quality
Air quality is satisfactory, and air pollution poses little or no risk.
Forecast
- ThuGood (38)
W San Gabriel Vly, CA reporting area · 1 hr ago. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.
Sun & moon
Almanac
MonthlyLos Angeles Downtown Area, records since 1877. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).
Nearby
- Los Angeles 18 km
- Long Beach 47 km
- Anaheim 44 km
- Santa Ana 55 km
- Glendale 13 km
- Santa Clarita 44 km
- Garden Grove 49 km
- Rancho Cucamonga 50 km
- Ontario 46 km
- Lancaster 57 km
- Palmdale 43 km
- Pomona 38 km
Forecasters' discussion
From the National Weather Service office in LOX, issued 11 hrs ago
Synopsis
21/227 AM.
Widespread rain will develop later today and continue into Thursday with a chance of thunderstorms. A weak Santa Ana will develop in the storm's wake by the weekend for dry and warmer conditions.
Long Term (sun-wed)
21/205 PM.
A low grade Santa Ana event will continue into next week continuing the dry and warmer pattern. Onshore flow is expected to return around mid week with temperatures returning to normal levels. There are some model solutions indicating a return of wet weather around Halloween.
Aviation
22/0001Z.
At 23Z at KLAX, there was no marine layer nor an inversion.
Low to moderate confidence in 00Z TAF package. Rain will turn to showers across the region this evening and continue through Thursday. There is a 30%-50% chance of MVFR CIGs at times with the rain.
There is a 10-20% chance of TSRA through the period with the chances spreading south and east this evening.
KLAX...Moderate confidence in 00Z TAF. There is a 50% chance that CIGs remain at VFR levels through the period with a 30%-50% chance of MVFR cigs at times. There is a 10%-20% chance of TSRA for much of the fcst period. There is 30% chance of an easterly wind component of 7-10 knots tonight.
KBUR...Low to moderate confidence in 00Z TAF. IFR cigs at fcst time should improve quickly. Then there is a 50% chance that CIGs remain at VFR levels through much the period with a 30%-50% chance of MVFR cigs at times. There is a 10%-20% chance of TSRA for much of the fcst period.
Marine
21/123 PM.
For the Outer Waters, high confidence in current forecast. Tonight through Thursday night, winds and seas are expected to remain below Small Craft Advisory (SCA) levels. On Friday, northwest winds will increase to SCA levels. For Saturday through Monday, winds and seas are expected to remain below SCA levels.
For the Inner Waters north of Point Sal, moderate to high confidence in current forecast. There is a 30-40% chance of SCA level winds Friday afternoon and evening. Otherwise, high confidence in winds and seas remaining below SCA levels through Monday.
For the Inner Waters south of Point Conception, moderate to high confidence in current forecast. Through this evening, there is a 60-80% chance of SCA level southeasterly winds across all the southern Inner Waters. For Thursday through Monday, high confidence in winds and seas remaining below SCA levels for most areas. The only exception will be the western half of the Santa Barbara Channel with a 50-70% chance of SCA level winds late Friday afternoon and evening.
Through Thursday, showers and isolated thunderstorms will impact all of the coastal waters. Any thunderstorms that develop will be capable of producing gusty/erratic winds, locally rough seas and even waterspouts.
Forecasts, observations and alerts in the United States come from the National Weather Service (NOAA); radar from NOAA's Multi-Radar Multi-Sensor system; satellite imagery from NASA's Global Imagery Browse Services (GIBS) and NOAA's GOES satellites; the map from the U.S. Geological Survey's National Map; air quality from AirNow (EPA and its partners); hurricane information from the National Hurricane Center; climate normals and records from NOAA's Regional Climate Centers (ACIS). Forecasts outside the United States and the UV index: MET Norway (CC BY 4.0); observations outside the U.S.: airport reports via NOAA's Aviation Weather Center. Place names: GeoNames (CC BY 4.0). Data are copied on a schedule and may lag the sources; for warnings that affect your safety, follow your local National Weather Service office and emergency officials. Weather news is drawn from the 4Conservative index and reflects what the press published. Terms of use.