See exactly when rain will start and stop with a minute-by-minute precipitation nowcast for the next hour.
Compare today's weather with yesterday's data and track temperature trends over time.
Hourly Forecast
Daylight Hours
06:41
Sunrise
18:53
Sunset
Moon
Waxing Crescent
11:16
Moonrise
20:47
Moonset
Daily Forecast
Today
Wednesday
Thursday
Friday
Saturday
Sunday
Monday
Tuesday
Wednesday
Thursday
Air Quality Data Available
Upgrade to access real-time air quality data for Signal Hill.
UV Index
Humidity
Weather in Signal Hill today, September 15, 2026
Cloud cover dominates in Signal Hill on September 15, 2026, keeping sunshine limited. Expect a grey, overcast feel rather than long bright spells. The first half of the day looks overcast, as cloud amounts reach about 100% around 08:00. Brighter weather, if it comes, waits until later.
The day peaks near 23°C and cools toward 19°C. Relative humidity sits between 73% and 92%, reaching its peak around 09:00. Expect gentle winds, highest near 11:00 at 4.3 km/h.
The afternoon keeps an overcast feel, as cloud reaches about 100% around 12:00. Outdoor plans may still want a flexible backup. Expect visibility near 15.1 km, with poorer spells close to 12.7 km. Daylight runs from 06:41 to 18:53, lasting 12 hours 11 minutes of sunlight today.
Overall, Signal Hill on September 15, 2026 stays grey and muted, so outdoor plans may want a flexible backup even with a high near 23°C.
Frequently asked questions about weather in Signal Hill
How warm does it get in Signal Hill?
The warmest month in Signal Hill is August, with average high temperatures of 26°C. The average temperature during this period is around 22°C.
How cold does it get in Signal Hill?
The coldest month in Signal Hill is January, with average low temperatures of 11°C. The average temperature during this period is around 14°C.
What is the wettest time of year in Signal Hill?
The wettest month in Signal Hill is January, with an average of 69mm of precipitation.
What is the driest time of year in Signal Hill?
The driest month in Signal Hill is July, with an average of 1mm of precipitation.
Explore more weather forecasts
- Long Beach, California
- New York City, New York
- Lakewood, California
- Los Angeles, California
- Rossmoor, California
- Brooklyn, New York
- Los Alamitos, California
- Chicago, Illinois
- Seal Beach, California
- Houston, Texas
- Hawaiian Gardens, California
- Queens, New York
- Paramount, California
- Phoenix, Arizona
- Bellflower, California
- Philadelphia, Pennsylvania
