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Walnut, CA Weather Tomorrow

The Walnut weather tomorrow and 5 day forecast provides precipitation chances, day and night conditions, high and low temperatures in Fahrenheit and Celsius, sunrise, sunset, sky conditions, wind chill, and wind speed with direction throughout the Walnut area.
Updated: Sun Sep 20th 2026 7:30 AM PDT
Walnut, CA Weather – 9-20 – Overcast
74° / 69°
Overcast
Skies will be overcast in Walnut, with a high of 74°F and a low of 69°F. There might be light rainfall having a 19% chance. Wind will be moderate, blowing around 12mph on average and gusts of 23mph at 7 PM. The humidity will be on the higher side, averaging about 72%, the maximum being 75% at 9 AM and 64% being its lowest at 3 PM. Barometric pressure is its highest of 29.94inHg at 11 AM, a lowest point of 29.87inHg at 5 PM with an avg 29.91inHg.
Walnut, CA Weather – 9-21 – Partly Cloudy
72° / 68°

Weather Tomorrow

Partly Cloudy
Daytime highs will reach 72°F with lows dropping to 68°F in Walnut, where it will be cloudy. There might be light rainfall having a 19% chance with an estimated 0.01in. Winds will be light at 10mph and gusts of 19.9mph at 4 PM. The humidity will be on the higher side, averaging about 70%, the maximum being 78% at 6 AM and 61% being its lowest at 4 PM. Barometric pressure is its highest of 29.94inHg at 9 AM, a lowest point of 29.85inHg at 5 PM with an avg 29.89inHg.
Walnut, CA Weather – 9-22 – Sunny
73° / 68°
Sunny
Walnut may see sunshine, with daytime highs of 73°F and overnight lows near 68°F. There's a very small chance of rainfall, only about 6% with an estimated 0in. Winds will be light at 10mph and gusts of 19.7mph at 4 PM. The humidity will be on the higher side, averaging about 68%, the maximum being 73% at 11 PM and 62% being its lowest at 2 PM. Barometric pressure is its highest of 29.91inHg at 9 AM, a lowest point of 29.79inHg at 5 PM with an avg 29.85inHg.
Walnut, CA Weather – 9-23 – Sunny
76° / 69°
Sunny
Daytime highs will reach 76°F with lows dropping to 69°F in Walnut, where it will be sunny. There's a very small chance of rainfall, only about 6%. Winds will be light at 9mph and gusts of 19.9mph at 3 PM. The humidity will be on the higher side, averaging about 73%, the maximum being 79% at 11 PM and 63% being its lowest at 3 PM. Barometric pressure is its highest of 29.89inHg at 11 PM, a lowest point of 29.81inHg at 5 PM with an avg 29.84inHg.
Walnut, CA Weather – 9-24 – Sunny
77° / 70°
Sunny
Walnut may see a sunny day, with daytime highs of 77°F and overnight lows near 70°F. There's a very small chance of rainfall, only about 8%. Winds will be light at 10mph and gusts of 19.5mph at 5 PM. The humidity will be on the higher side, averaging about 74%, the maximum being 82% at 6 AM and 63% being its lowest at 4 PM. Barometric pressure is its highest of 29.91inHg at 8 AM, a lowest point of 29.84inHg at 5 PM with an avg 29.88inHg.
Walnut, CA Weather – 9-25 – Sunny
80° / 71°
Sunny
In Walnut, bright and sunny conditions with highs near 80°F and lows around 71°F. There's a very small chance of rainfall, only about 5%. Wind will be moderate, blowing around 12mph on average and gusts of 20.6mph at 2 PM. The humidity will be on the higher side, averaging about 66%, the maximum being 77% at 5 AM and 55% being its lowest at 2 PM. Barometric pressure is its highest of 29.88inHg at 12 AM, a lowest point of 29.81inHg at 5 PM with an avg 29.85inHg.

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