Fullerton, CA Weather Forecast
Local 7-day forecast
Partly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Fullerton, CA in one place.
Partly sunny, with a high near 73. Southwest wind 0 to 10 mph.
Local Weather Overview
This forecast page for Fullerton, CA is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: May 23, 2026 11:46 PM PDT.
The active forecast window currently covers May 25 to May 30, 2026 for Fullerton, CA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- May 25 to May 30, 2026
- Latest sync
- May 23, 2026 11:46 PM PDT
- Forecast office
- SGX
- Source
- NOAA / NWS
Daily Outlook
This Week in Fullerton
Saturday looks like the warmest upcoming period in Fullerton at 77 degrees F.
Monday Night is the coolest period ahead with temperatures near 56 degrees F.
The strongest winds are forecast for Memorial Day at about 0 to 10 mph SW.
The forecast from May 25 through May 30 stays mostly dry.
Forecast Details
- Last updated
- May 23, 2026 11:46 PM PDT
- Coverage
- 6 days
- Time zone
- America/Los_Angeles
- Forecast office
- SGX
- Radar station
- KSOX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly cloudy, with a low around 56. Southwest wind 0 to 10 mph.
Partly sunny, with a high near 70.
Mostly cloudy, with a low around 57.
Partly sunny, with a high near 70.
Mostly cloudy, with a low around 56.
Mostly sunny, with a high near 71.
Mostly clear, with a low around 56.
Sunny, with a high near 74.
Mostly clear, with a low around 57.
Sunny, with a high near 77.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Memorial Day
May 25
|
Partly Sunny
|
73°F |
0 to 10 mph
SW
|
|
Monday Night
May 25
|
Mostly Cloudy
|
56°F |
0 to 10 mph
SW
|
|
Tuesday
May 26
|
Partly Sunny
|
70°F |
5 to 10 mph
SW
|
|
Tuesday Night
May 26
|
Mostly Cloudy
|
57°F |
5 to 10 mph
S
|
|
Wednesday
May 27
|
Partly Sunny
|
70°F |
5 to 10 mph
S
|
|
Wednesday Night
May 27
|
Mostly Cloudy
|
56°F |
0 to 10 mph
S
|
|
Thursday
May 28
|
Mostly Sunny
|
71°F |
0 to 10 mph
S
|
|
Thursday Night
May 28
|
Mostly Clear
|
56°F |
0 to 10 mph
S
|
|
Friday
May 29
|
Sunny
|
74°F |
0 to 10 mph
SW
|
|
Friday Night
May 29
|
Mostly Clear
|
57°F |
0 to 10 mph
S
|
|
Saturday
May 30
|
Sunny
|
77°F |
0 to 10 mph
S
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Fullerton.
