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Irwindale, CA Weather Forecast
Irwindale, CA Weather Forecast Dated: 1010 PM Mon Sep 21 2026
Expect a hot stretch with plenty of sunshine and mostly dry weather over the coming period. comfortable humidity and an unsettled pattern will dominate.
Monday, September 21, 2026
Mid-Morning
69°F 21°C
Overcast
Mid-Afternoon
78°F 25°C
Sunny
Early-Evening
73°F 23°C
Sunny
Pleasant near 78°F 25°C, overcast in the morning, becoming sunny through the afternoon and evening, with lower humidity and steady pressure. Winds turning from the SSE to the SSW at 8 mph 13 km/h.
Tuesday, September 22, 2026
Mid-Morning
69°F 20°C
Sunny
Mid-Afternoon
82°F 28°C
Sunny
Early-Evening
76°F 24°C
Sunny
Balmy with temperatures reaching 82°F 28°C, sunny throughout the day, with lower humidity and barometric pressure falling. Winds blowing from the SW at 9 mph 15 km/h.
Wednesday, September 23, 2026
Mid-Morning
73°F 23°C
Sunny
Mid-Afternoon
90°F 32°C
Sunny
Early-Evening
78°F 26°C
Sunny
Sizzling hot with 90°F 32°C, sunny throughout the day, with steady humidity and steady pressure. Winds WSW at 9 mph 15 km/h.
Thursday, September 24, 2026
Mid-Morning
74°F 24°C
Smoky Haze
Mid-Afternoon
89°F 32°C
Sunny
Early-Evening
80°F 27°C
Sunny
Warm temperatures up to 89°F 32°C, sunny throughout the day, with lower humidity and steady pressure. Winds out of the SW at 10 mph 16 km/h.
Friday, September 25, 2026
Mid-Morning
75°F 24°C
Overcast
Mid-Afternoon
91°F 33°C
Overcast
Early-Evening
83°F 28°C
Overcast
Very hot with a high of 91°F 33°C, overcast through the afternoon, turning cloudy this evening, with lower humidity and steady pressure. Winds shifting from the SSW to the S at 8 mph 13 km/h.
Saturday, September 26, 2026
Mid-Morning
79°F 26°C
Overcast
Mid-Afternoon
91°F 33°C
Sunny
Early-Evening
84°F 29°C
Overcast
Very hot with temperatures reaching 91°F 33°C, overcast in the morning, becoming cloudy through the afternoon and evening, with lower humidity and steady pressure. Winds turning from the WSW to the SW at 7 mph 11 km/h.
Sunday, September 27, 2026
Mid-Morning
77°F 25°C
Sunny
Mid-Afternoon
87°F 31°C
Sunny
Early-Evening
81°F 27°C
Sunny
Balmy with temperatures reaching 87°F 31°C, sunny throughout the day, with lower humidity and steady pressure. Winds switching from the SW to the SSW at 8 mph 13 km/h.
Monday, September 28, 2026
Mid-Morning
74°F 23°C
Sunny
Mid-Afternoon
87°F 30°C
Sunny
Early-Evening
81°F 28°C
Sunny
Quite warm around 87°F 30°C, sunny throughout the day, with lower humidity and steady pressure. Winds moving from the SSW to the SW at 7 mph 11 km/h.
Tuesday, September 29, 2026
Mid-Morning
78°F 25°C
Sunny
Mid-Afternoon
90°F 32°C
Sunny
Early-Evening
82°F 28°C
Sunny
Hot temperatures near 90°F 32°C, sunny throughout the day, with steady humidity and steady pressure. Winds swinging from the SW to the SSW at 8 mph 12 km/h.
Wednesday, September 30, 2026
Mid-Morning
78°F 25°C
Sunny
Mid-Afternoon
90°F 32°C
Sunny
Early-Evening
85°F 30°C
Sunny
Very hot with a high of 90°F 32°C, sunny throughout the day, with lower humidity and steady pressure.
Thursday, October 1, 2026
Mid-Morning
83°F 28°C
Sunny
Mid-Afternoon
97°F 36°C
Sunny
Early-Evening
91°F 33°C
Sunny
Very hot with temperatures reaching 97°F 36°C, sunny throughout the day, with steady humidity and steady pressure. Winds shifting from the WNW to the SSW at 6 mph 9 km/h.
Friday, October 2, 2026
Mid-Morning
91°F 33°C
Cloudy
Mid-Afternoon
102°F 39°C
Sunny
Early-Evening
99°F 37°C
Partly Cloudy
Dangerously hot with a high of 102°F 39°C, cloudy in the morning, sunny in the afternoon, and partly cloudy this evening, with steady humidity and steady pressure.
Saturday, October 3, 2026
Mid-Morning
91°F 33°C
Scattered Showers
Mid-Afternoon
97°F 36°C
Sunny
Early-Evening
88°F 31°C
Sunny
Sizzling hot with 97°F 36°C, periods of heavy rain and gusty conditions, with increasing humidity and steady pressure. Winds turning from the SSE to the SSW at 8 mph 13 km/h.
Sunday, October 4, 2026
Mid-Morning
83°F 28°C
Sunny
Mid-Afternoon
96°F 36°C
Sunny
Early-Evening
92°F 34°C
Sunny
Hot temperatures near 96°F 36°C, sunny throughout the day, with lower humidity and steady pressure.
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