Tustin, CA Weather Forecast
Orange County, California
Seven-day outlook
57–76°F across the weekThe week runs between 58° and 76°, with Monday the warmest day of it. There is no real trend across it: one day looks much like the next. Sunday is the wettest day, peaking near 79%. 4 of the 7 days stay dry.
Forecasts come from the National Weather Service's own computer models, and current conditions from the nearest reporting weather station. Both are served through the weather API. A forecast is guidance, not a warning, and anything the Weather Service has actually issued is on the live map.
The written summaries on this page are generated from the forecast data above, not by a meteorologist. Each sentence is a reading of the same numbers you can see, and no forecaster has reviewed them.
About the Tustin forecast
Tustin sits at 33.7309°N, 117.8106°W in Orange County, California. The forecast above is drawn for that point from the National Weather Service's own computer models: a seven-day outlook, and a finer-grained one covering the next eighteen hours where it reaches, and the radar and alert panels show what the Weather Service has out over the area right now.
- County
- Orange County
- Coordinates
- 33.7309°N, 117.8106°W
- Population
- 77,704 · 2023 estimate
- Land area
- 11.123 sq mi
Place data from the US Census Bureau. Coordinates are the Census internal point for Tustin, and the forecast is for that location, not for every address inside the city limits, and a large city can have real weather differences from one side to the other.
How well can the network see Tustin?
The nearest Doppler radar is KSOX (Santa Ana Mountains, CA), 12 miles to the ENE. A WSR-88D's lowest routine scan sits half a degree above horizontal, and the earth curves away beneath it, so by the time that beam reaches Tustin its center is about 610 ft above ground. That is about as close as radar coverage gets in the United States: the lowest scan is still near the ground when it reaches Tustin, so low-level rotation and the leading edge of a gust front show up on it. Tustin is closer to its radar than 94% of US cities.
The closest instrument actually measuring the air is KSNA · Santa Ana/Wayne Arpt on the ASOS/AWOS network, 4.8 miles away. Close enough that its readings are, for practical purposes, the conditions in town.
Beam height is the standard 4/3-earth approximation for the 0.5° scan and assumes normal refraction; it is where the center of the beam is, not its edges, and unusual temperature profiles bend it. Radar siting from the NWS WSR-88D network, station positions from the California observing network as of this build.
Forecasts near Tustin
- Santa Ana, CA4 mi
- Irvine, CA4 mi
- Orange, CA5 mi
- Villa Park, CA6 mi
- Costa Mesa, CA7 mi
- Fountain Valley, CA8 mi
- Anaheim, CA9 mi
- Garden Grove, CA9 mi
Elsewhere in California
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