Rancho Cucamonga weather by month

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Rancho Cucamonga, nestled in the foothills of the San Gabriel Mountains in Southern California, boasts a Mediterranean climate characterized by warm, dry summers and mild, wet winters. This makes it a desirable location for those seeking sunshine and outdoor activities year-round. But even in Southern California, weather patterns shift throughout the year. This comprehensive guide breaks down the Rancho Cucamonga weather by month, helping you plan your visit or simply prepare for what’s ahead.

Rancho Cucamonga Climate Overview

Before diving into the specifics, it’s helpful to understand the general climate. Rancho Cucamonga enjoys over 280 sunny days a year. The average high temperature is around 77°F (25°C), and the average low is 55°F (13°C). Rainfall is concentrated in the winter months, with summers typically being very dry. The city benefits from a cooling effect from the nearby mountains, preventing temperatures from becoming excessively high during the summer.

Rancho Cucamonga Weather by Month

Here’s a detailed look at what you can expect each month:

Month Avg High (°F) Avg Low (°F) Rainfall (inches) Humidity (%) Typical Conditions
January 62 43 2.5 65 Cool, rainy, occasional fog
February 65 45 2.2 62 Mild, some rain, wildflowers begin
March 69 48 1.8 58 Pleasant, warming, blooming trees
April 73 51 0.8 52 Warm, sunny, ideal for outdoor activities
May 78 56 0.3 48 Warm and dry, perfect weather
June 83 61 0.1 45 Hot and dry, summer begins
July 87 65 0.0 42 Hottest month, very dry
August 88 66 0.0 43 Hot and dry, similar to July
September 84 63 0.2 47 Warm, pleasant, slight cooling
October 77 56 0.7 53 Mild, sunny, fall foliage
November 68 48 1.4 59 Cool, some rain, preparing for winter
December 62 43 2.0 63 Cool, rainy, holiday season

Spring in Rancho Cucamonga (March – May)

Spring is arguably the most beautiful time to visit Rancho Cucamonga. Temperatures gradually rise, wildflowers bloom in the surrounding hills, and the air is fresh and clean. March and April see occasional showers, but these are usually brief. By May, the weather is consistently warm and dry, making it perfect for hiking, biking, and exploring the outdoors. Expect average highs in the low 70s to upper 70s.

Summer in Rancho Cucamonga (June – August)

Summers in Rancho Cucamonga are hot and dry. Temperatures frequently reach the high 80s and even low 90s. While the dry heat is generally comfortable, it’s important to stay hydrated and seek shade during the hottest part of the day. This is a great time for water activities at nearby lakes and pools. Evenings are pleasantly warm.

Fall in Rancho Cucamonga (September – November)

Fall brings a welcome respite from the summer heat. Temperatures begin to cool down, and the humidity drops. September and October are particularly pleasant, with warm days and cool nights. The surrounding hillsides display beautiful fall colors. November sees an increase in rainfall, signaling the approach of winter.

Winter in Rancho Cucamonga (December – February)

Winters in Rancho Cucamonga are mild and wet. Temperatures rarely drop below freezing. Rainfall is concentrated in January and February, but even then, sunny days are common. While snow is rare in the city itself, the nearby San Gabriel Mountains often receive snowfall, providing opportunities for winter sports.

Frequently Asked Questions (FAQ)

Q: What is the hottest month in Rancho Cucamonga?
A: August is typically the hottest month, with average highs around 88°F.

Q: When is the rainy season in Rancho Cucamonga?
A: The rainy season is primarily from November to February.

Q: Does it snow in Rancho Cucamonga?
A: Snow is rare in the city itself, but the nearby mountains often receive snowfall.

Q: What should I pack if I’m visiting in the summer?
A: Pack light clothing, sunscreen, a hat, and sunglasses. Staying hydrated is crucial.

Q: Is Rancho Cucamonga humid?
A: Rancho Cucamonga generally has low humidity, especially during the summer months.

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