Today | Weather | Thursday, September 18, 2025

Active Weather Warnings

Flood Watch

Weather in Lancaster, California

02:41 PM

Now

81° F

Feels Like 82°

Precipitation 63 %

Wind 8 mph

UV Index (0 - 11+) 11

Humidity 62 %

Today

Day 81°

Night 64°

Precipitation 96 %

Wind 13

UV Index (0 - 11+) 11

Warning: Extreme UV Index Today: 11+

Overexposure to the sun's harmful UV rays can cause sunburn and increase the risk of developing skin cancer, including melanoma. Protect yourself by wearing clothing that covers your skin, sunglasses, and a hat. Apply a broad-spectrum sunscreen with an SPF of 30 or higher every two hours, even on cloudy days. Minimize direct sun exposure during peak hours (10 AM to 4 PM) to reduce the risk.

Lancaster Weather Forecast Updated

19 minutes ago

Last updated on September 18, 2025 2:22 PM

Weather Forecast History

Last Year's Weather on This Day (September 18, 2024)

Day

82°

Night

57°

Wind

12 mph

UV Index

Precipitation

Air quality in Lancaster

NOW

56 AQI

Moderate air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 9.19 µg/m³

PM10 11.35 µg/m³

O₃ 51.01 ppb

NO₂ 4.80 ppb

SO₂ 1.90 ppb

CO 143.13 ppb

PM_2.5 – Fine particles <2.5μm

PM₁₀ – Inhalable particles <10μm

O₃ – Ozone

NO₂ – Nitrogen dioxide

SO₂ – Sulfur dioxide

CO – Carbon monoxide

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.

View Hourly Air Quality Forecast

Weather Alerts and Warnings for Lancaster

Severe Future Possible

Flood Watch

Flood Watch issued September 18 at 10:27AM PDT until September 19 at 2:00AM PDT by NWS Los Angeles/Oxnard CA

Sep 18, 10:27 AM → Sep 19, 2:00 AM

WHAT: Flash flooding caused by excessive rainfall continues to be
possible.

WHERE: A portion of southwest California, including the following
areas, Antelope Valley, Eastern Antelope Valley Foothills, Eastern
San Gabriel Mountains, Interstate 5 Corridor, Northern Ventura
County Mountains, Western Antelope Valley Foothills and Western
San Gabriel Mountains and Highway 14 Corridor.

WHEN: Through late tonight.

IMPACTS: Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.
Debris flows possible in recently burnt areas.

ADDITIONAL DETAILS:
- An additional round of heavy showers and thunderstorms could
bring local rainfall rates to one-half to one inch per hour,
capable of flash flooding and debris flows. The risk for
high-impact flooding will steadily decrease after 7 PM PDT,
ending by 2 AM PDT.
- http://www.weather.gov/safety/flood
+ Read More

A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a VERY DANGEROUS SITUATION.

Updated: Sep 18, 2:22 PM Source: NWS Alert