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Ontario, CA Weather Forecast
Ontario, CA Weather Forecast Dated: 1029 PM Sun Sep 13 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.
Sunday, September 13, 2026
Mid-Morning
71°F 22°C
Sunny
Mid-Afternoon
85°F 29°C
Sunny
Early-Evening
77°F 25°C
Sunny
Warm and summery near 85°F 29°C, sunny throughout the day, with lower humidity and steady pressure. Winds out of the WSW at 10 mph 16 km/h.
Monday, September 14, 2026
Mid-Morning
73°F 23°C
Sunny
Mid-Afternoon
84°F 29°C
Sunny
Early-Evening
75°F 24°C
Sunny
Balmy with temperatures reaching 84°F 29°C, sunny throughout the day, with lower humidity and steady pressure. Winds switching from the SSW to the SW at 8 mph 13 km/h.
Tuesday, September 15, 2026
Mid-Morning
69°F 21°C
Sunny
Mid-Afternoon
81°F 27°C
Sunny
Early-Evening
73°F 23°C
Sunny
Quite warm around 81°F 27°C, sunny throughout the day, with lower humidity and steady pressure. Winds SW at 11 mph 18 km/h.
Wednesday, September 16, 2026
Mid-Morning
68°F 20°C
Sunny
Mid-Afternoon
80°F 27°C
Sunny
Early-Evening
72°F 23°C
Sunny
Warm temperatures up to 80°F 27°C, sunny throughout the day, with lower humidity and steady pressure. Winds out of the WSW at 10 mph 17 km/h.
Thursday, September 17, 2026
Mid-Morning
68°F 20°C
Sunny
Mid-Afternoon
82°F 28°C
Sunny
Early-Evening
74°F 23°C
Sunny
Very warm with a high of 82°F 28°C, sunny throughout the day, with lower humidity and steady pressure. Winds blowing from the WSW at 9 mph 15 km/h.
Friday, September 18, 2026
Mid-Morning
69°F 21°C
Sunny
Mid-Afternoon
82°F 28°C
Sunny
Early-Evening
76°F 25°C
Sunny
Warm and summery near 82°F 28°C, sunny throughout the day, with lower humidity and steady pressure. Winds turning from the WSW to the SW at 7 mph 12 km/h.
Saturday, September 19, 2026
Mid-Morning
70°F 21°C
Sunny
Mid-Afternoon
83°F 28°C
Sunny
Early-Evening
76°F 25°C
Sunny
Balmy with temperatures reaching 83°F 28°C, sunny throughout the day, with steady humidity and steady pressure. Winds out of the WSW at 9 mph 14 km/h.
Sunday, September 20, 2026
Mid-Morning
70°F 21°C
Sunny
Mid-Afternoon
82°F 28°C
Partly Cloudy
Early-Evening
76°F 25°C
Overcast
Quite warm around 82°F 28°C, sunny through the afternoon, turning overcast this evening, with lower humidity and steady pressure. Winds moving from the WSW to the SW at 7 mph 11 km/h.
Monday, September 21, 2026
Mid-Morning
69°F 21°C
Sunny
Mid-Afternoon
79°F 26°C
Sunny
Early-Evening
71°F 22°C
Sunny
Mild temperatures up to 79°F 26°C, sunny throughout the day, with lower humidity and steady pressure. Winds swinging from the WSW to the SW at 8 mph 13 km/h.
Tuesday, September 22, 2026
Mid-Morning
67°F 19°C
Sunny
Mid-Afternoon
78°F 26°C
Sunny
Early-Evening
71°F 22°C
Sunny
Mild with a high of 78°F 26°C, sunny throughout the day, with steady humidity and steady pressure. Winds out of the WSW at 9 mph 14 km/h.
Wednesday, September 23, 2026
Mid-Morning
68°F 20°C
Sunny
Mid-Afternoon
79°F 26°C
Sunny
Early-Evening
72°F 23°C
Sunny
Pleasant near 79°F 26°C, sunny throughout the day, with steady humidity and steady pressure. Winds blowing from the WSW at 10 mph 15 km/h.
Thursday, September 24, 2026
Mid-Morning
69°F 20°C
Sunny
Mid-Afternoon
81°F 27°C
Sunny
Early-Evening
74°F 23°C
Sunny
Balmy with temperatures reaching 81°F 27°C, sunny throughout the day, with lower humidity and steady pressure. Winds WSW at 9 mph 15 km/h.
Friday, September 25, 2026
Mid-Morning
70°F 21°C
Sunny
Mid-Afternoon
83°F 28°C
Sunny
Early-Evening
77°F 25°C
Sunny
Quite warm around 83°F 28°C, sunny in the morning, partly cloudy in the afternoon, and sunny this evening, with lower humidity and steady pressure. Winds out of the WSW at 9 mph 14 km/h.
Saturday, September 26, 2026
Mid-Morning
72°F 22°C
Overcast
Mid-Afternoon
85°F 29°C
Overcast
Early-Evening
77°F 26°C
Overcast
Warm temperatures up to 85°F 29°C, partly cloudy in the morning, cloudy in the afternoon, and overcast this evening, with steady humidity and steady pressure. Winds blowing from the WSW at 8 mph 13 km/h.
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