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Fullerton, LA Weather Forecast
Fullerton, LA Weather Forecast Dated: 1000 PM Wed Sep 09 2026
Expect a hot stretch with a mix of sun and clouds and occasional showers over the coming period. moderate humidity and no major pressure swings will dominate. Isolated storms at times.
Wednesday, September 9, 2026
Mid-Morning
80°F 27°C
Sunny
Mid-Afternoon
98°F 36°C
Sunny
Early-Evening
90°F 32°C
Overcast
Sizzling hot near 98°F 36°C with a heat index reaching 107°F 41°C, sunny through the afternoon, turning overcast this evening, with lower humidity and barometric pressure falling.
Thursday, September 10, 2026
Mid-Morning
82°F 28°C
Overcast
Mid-Afternoon
99°F 37°C
Cloudy
Early-Evening
86°F 30°C
Overcast
Hot and sweltering around 99°F 37°C (heat index 102°F 39°C), overcast in the morning, cloudy in the afternoon, and overcast this evening, with lower humidity and barometric pressure falling.
Friday, September 11, 2026
Mid-Morning
82°F 28°C
Sunny
Mid-Afternoon
89°F 32°C
Nearby Thunderstorms
Early-Evening
86°F 30°C
Sunny
Very warm near 89°F 32°C, though humidity makes it feel like 96°F 36°C, heavy thunderstorms conditions at times, with lower humidity and steady pressure.
Saturday, September 12, 2026
Mid-Morning
78°F 26°C
Heavy Rain Showers
Mid-Afternoon
93°F 34°C
Nearby Thunderstorms
Early-Evening
87°F 30°C
Nearby Thunderstorms
Sizzling hot near 93°F 34°C with a heat index reaching 100°F 38°C, periods of heavy rain and gusty conditions, with lower humidity and steady pressure.
Sunday, September 13, 2026
Mid-Morning
82°F 28°C
Sunny
Mid-Afternoon
99°F 37°C
Partly Cloudy
Early-Evening
89°F 32°C
Overcast
Hot and sweltering around 99°F 37°C (heat index 103°F 39°C), partly cloudy in the morning, cloudy in the afternoon, and partly cloudy this evening, with lower humidity and steady pressure.
Monday, September 14, 2026
Mid-Morning
82°F 28°C
Sunny
Mid-Afternoon
98°F 36°C
Partly Cloudy
Early-Evening
88°F 32°C
Overcast
Very hot with a high of 98°F 36°C, feeling closer to 101°F 39°C in the humidity, sunny in the morning, becoming overcast through the afternoon and evening, with lower humidity and steady pressure.
Tuesday, September 15, 2026
Mid-Morning
83°F 29°C
Fog
Mid-Afternoon
98°F 37°C
Sunny
Early-Evening
87°F 31°C
Sunny
Sizzling hot near 98°F 37°C with a heat index reaching 102°F 39°C, overcast in the morning, sunny in the afternoon, and partly cloudy this evening, with lower humidity and steady pressure.
Wednesday, September 16, 2026
Mid-Morning
85°F 29°C
Sunny
Mid-Afternoon
97°F 36°C
Sunny
Early-Evening
87°F 31°C
Overcast
Hot and sweltering around 97°F 36°C (heat index 101°F 38°C), sunny in the morning, becoming cloudy through the afternoon and evening, with steady humidity and steady pressure.
Thursday, September 17, 2026
Mid-Morning
83°F 28°C
Partly Cloudy
Mid-Afternoon
89°F 32°C
Scattered Showers
Early-Evening
83°F 28°C
Scattered Showers
Very warm near 89°F 32°C, though humidity makes it feel like 96°F 36°C, locally heavy downpours at times, with steady humidity and steady pressure.
Friday, September 18, 2026
Mid-Morning
76°F 25°C
Light Fog
Mid-Afternoon
86°F 30°C
Cloudy
Early-Evening
82°F 28°C
Scattered Showers
Warm and summery around 86°F 30°C (feels like 90°F 32°C), periods of heavy rain and gusty conditions, with lower humidity and steady pressure.
Saturday, September 19, 2026
Mid-Morning
73°F 23°C
Partly Cloudy
Mid-Afternoon
86°F 30°C
Partly Cloudy
Early-Evening
78°F 26°C
Cloudy
Warm and summery near 86°F 30°C, partly cloudy in the morning, cloudy in the afternoon, and partly cloudy this evening, with steady humidity and steady pressure. Winds out of the NNE at 8 mph 12 km/h.
Sunday, September 20, 2026
Mid-Morning
71°F 22°C
Sunny
Mid-Afternoon
87°F 30°C
Sunny
Early-Evening
78°F 26°C
Overcast
Balmy with temperatures reaching 87°F 30°C, sunny in the morning, cloudy in the afternoon, and sunny this evening, with steady humidity and steady pressure.
Monday, September 21, 2026
Mid-Morning
73°F 23°C
Sunny
Mid-Afternoon
89°F 32°C
Sunny
Early-Evening
79°F 26°C
Sunny
Quite warm around 89°F 32°C, sunny throughout the day, with steady humidity and barometric pressure falling.
Tuesday, September 22, 2026
Mid-Morning
77°F 25°C
Light Fog
Mid-Afternoon
92°F 34°C
Sunny
Early-Evening
86°F 30°C
Partly Cloudy
Hot temperatures near 92°F 34°C, sunny in the morning, partly cloudy in the afternoon, and overcast this evening, with lower humidity and steady pressure. Winds blowing from the NE at 9 mph 15 km/h.
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