Fullerton, CA Weather Forecast
Right now it is 72°F and sunny in Fullerton (as of Tue, 10:08 AM PST). Today: high near 76°F. Tomorrow: sunny, high near 76°F. Official NWS forecast and alerts, refreshed every 30 minutes.
Current conditions
Measured at FW0063 Fullerton CSU (3 mi from the city center).
Weather tomorrow in Fullerton
Sunny76°FSunny, with a high near 76. South wind 0 to 5 mph.
Mostly Clear58°FMostly clear, with a low around 58. Northeast wind 0 to 5 mph.
Weather alerts
No active National Weather Service watches, warnings or advisories for Fullerton right now.
7-day forecast
Sunny76°F / 56°FSunny, with a high near 76. West wind 0 to 10 mph. Tonight: Mostly clear, with a low around 56. Southeast wind 0 to 5 mph.
Sunny76°F / 58°FSunny, with a high near 76. South wind 0 to 5 mph. Wednesday Night: Mostly clear, with a low around 58. Northeast wind 0 to 5 mph.
Sunny80°F / 58°FSunny, with a high near 80. Southwest wind 0 to 5 mph. Thursday Night: Mostly clear, with a low around 58.
Sunny84°F / 59°FSunny, with a high near 84. Friday Night: Clear, with a low around 59.
Sunny87°F / 62°FSunny, with a high near 87. Saturday Night: Mostly clear, with a low around 62.
Sunny87°F / 62°FSunny, with a high near 87. Sunday Night: Partly cloudy, with a low around 62.
Mostly Sunny84°F / 62°FMostly sunny, with a high near 84. Monday Night: Partly cloudy, with a low around 62.
Forecast issued by NWS forecast office SGX · updated Nov 3, 12:49 AM PST. Daytime highs and overnight lows are on the right.
Hourly forecast, radar & more on weather.gov
Nearby cities
Fullerton population: 138,675 (U.S. Census Bureau, July 1, 2025 estimate). More California cities · All US cities
Source: National Weather Service / NOAA (public domain), fetched live. Tachlis is not affiliated with the NWS.
Questions & answers
What is the weather tomorrow in Fullerton?
Wednesday, November 4: Sunny, high near 76°F; night: mostly clear, low around 58°F.
Where does the Fullerton forecast come from?
From the National Weather Service forecast office SGX, which writes the official forecast for Fullerton's 2.5 km grid square. Current conditions come from the nearest NWS/FAA weather station.
How often is the Fullerton weather updated?
This page fetches fresh data from the National Weather Service at most every 30 minutes, and checks for new watches and warnings every 5 minutes.
What time zone are the times shown in?
Local time for Fullerton (America/Los Angeles).
Why can the current temperature differ from the forecast?
The current reading is a real measurement at a weather station, often at an airport, while the forecast describes the whole grid square around the city. Temperatures can differ by a few degrees across a city.