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Fullerton, CA Weather Forecast
Fullerton, CA Weather Forecast Dated: 724 PM Wed Sep 23 2026
Expect a very warm period with plenty of sunshine and mostly dry weather over the coming period. moderate humidity and no major pressure swings will dominate.
Wednesday, September 23, 2026
Mid-Morning
70°F 21°C
Sunny
Mid-Afternoon
76°F 24°C
Sunny
Early-Evening
73°F 23°C
Sunny
Pleasant near 76°F 24°C, sunny in the morning, partly cloudy in the afternoon, and sunny this evening, with steady humidity and steady pressure. Winds turning from the S to the SSE at 8 mph 12 km/h.
Thursday, September 24, 2026
Mid-Morning
72°F 22°C
Sunny
Mid-Afternoon
78°F 25°C
Sunny
Early-Evening
74°F 23°C
Sunny
Comfortable with temperatures reaching 78°F 25°C, sunny throughout the day, with steady humidity and steady pressure. Winds switching from the S to the SSW at 7 mph 11 km/h.
Friday, September 25, 2026
Mid-Morning
74°F 23°C
Sunny
Mid-Afternoon
80°F 27°C
Partly Cloudy
Early-Evening
77°F 25°C
Overcast
Quite warm around 80°F 27°C, sunny in the morning, partly cloudy in the afternoon, and overcast this evening, with steady humidity and steady pressure. Winds moving from the SW to the SSW at 7 mph 11 km/h.
Saturday, September 26, 2026
Mid-Morning
76°F 24°C
Overcast
Mid-Afternoon
81°F 27°C
Overcast
Early-Evening
79°F 26°C
Overcast
Warm temperatures up to 81°F 27°C, overcast throughout the day, with steady humidity and steady pressure. Winds swinging from the NNE to the SW at 7 mph 12 km/h.
Sunday, September 27, 2026
Mid-Morning
74°F 23°C
Sunny
Mid-Afternoon
78°F 25°C
Sunny
Early-Evening
76°F 25°C
Sunny
Mild with a high of 78°F 25°C, sunny throughout the day, with lower humidity and steady pressure. Winds shifting from the SW to the WSW at 8 mph 12 km/h.
Monday, September 28, 2026
Mid-Morning
73°F 23°C
Sunny
Mid-Afternoon
79°F 26°C
Sunny
Early-Evening
77°F 25°C
Sunny
Pleasant near 79°F 26°C, sunny throughout the day, with steady humidity and barometric pressure falling. Winds turning from the SW to the WSW at 7 mph 11 km/h.
Tuesday, September 29, 2026
Mid-Morning
81°F 27°C
Sunny
Mid-Afternoon
86°F 30°C
Sunny
Early-Evening
83°F 28°C
Sunny
Balmy with temperatures reaching 86°F 30°C, sunny throughout the day, with steady humidity and steady pressure. Winds switching from the W to the SW at 7 mph 11 km/h.
Wednesday, September 30, 2026
Mid-Morning
77°F 25°C
Sunny
Mid-Afternoon
78°F 26°C
Sunny
Early-Evening
75°F 24°C
Sunny
Enjoyable around 78°F 26°C, sunny throughout the day, with steady humidity and steady pressure. Winds blowing from the SW at 11 mph 17 km/h.
Thursday, October 1, 2026
Mid-Morning
74°F 24°C
Sunny
Mid-Afternoon
77°F 25°C
Sunny
Early-Evening
74°F 24°C
Sunny
Mild temperatures up to 77°F 25°C, sunny throughout the day, with steady humidity and steady pressure. Winds swinging from the W to the SSW at 8 mph 12 km/h.
Friday, October 2, 2026
Mid-Morning
72°F 22°C
Sunny
Mid-Afternoon
76°F 25°C
Sunny
Early-Evening
73°F 23°C
Sunny
Mild with a high of 76°F 25°C, sunny throughout the day, with steady humidity and steady pressure. Winds shifting from the SW to the SSW at 8 mph 12 km/h.
Saturday, October 3, 2026
Mid-Morning
70°F 21°C
Cloudy
Mid-Afternoon
74°F 24°C
Sunny
Early-Evening
72°F 23°C
Sunny
Pleasant near 74°F 24°C, partly cloudy in the morning, becoming sunny through the afternoon and evening, with steady humidity and steady pressure. Winds turning from the SSE to the S at 6 mph 11 km/h.
Sunday, October 4, 2026
Mid-Morning
78°F 26°C
Sunny
Mid-Afternoon
86°F 30°C
Sunny
Early-Evening
80°F 27°C
Sunny
Balmy with temperatures reaching 86°F 30°C, sunny throughout the day, with increasing humidity and steady pressure. Winds switching from the NNE to the WSW at 7 mph 12 km/h.
Monday, October 5, 2026
Mid-Morning
78°F 26°C
Sunny
Mid-Afternoon
84°F 29°C
Sunny
Early-Evening
80°F 27°C
Sunny
Quite warm around 84°F 29°C, sunny throughout the day, with steady humidity and steady pressure. Winds moving from the ESE to the WSW at 7 mph 11 km/h.
Tuesday, October 6, 2026
Mid-Morning
73°F 23°C
Sunny
Mid-Afternoon
76°F 25°C
Sunny
Early-Evening
73°F 23°C
Sunny
Mild temperatures up to 76°F 25°C, sunny throughout the day, with steady humidity and steady pressure. Winds blowing from the SW at 10 mph 15 km/h.
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