San Bernardino weather by month

San Bernardino, nestled in California’s Inland Empire, enjoys a diverse climate characterized by hot, dry summers and mild, wetter winters. Understanding the weather patterns throughout the year is crucial for planning a visit or simply preparing for what’s to come. This guide provides a detailed look at San Bernardino weather by month, helping you make the most of your time in this vibrant city.

January: Cool and Damp Beginnings

January in San Bernardino is typically the coolest month, with average high temperatures around 60°F (15.6°C) and lows dipping to 40°F (4.4°C). Rainfall is common, making it the wettest month of the year. Expect overcast skies and occasional chilly breezes. It’s a good time for hiking in the lower elevations, as the mountains may still have snow. Layering is key!

February: A Shift Towards Spring

February sees a gradual warming trend, with average highs reaching 64°F (17.8°C) and lows around 43°F (6.1°C). Rainfall begins to decrease, though showers are still possible. Wildflowers start to bloom in the surrounding hills, adding a splash of color to the landscape.

March: Pleasant and Mild

March marks the true arrival of spring. Temperatures climb to an average high of 69°F (20.6°C) and a low of 47°F (8.3°C). The weather is generally sunny and pleasant, ideal for outdoor activities. The desert areas begin to warm up significantly.

April: Warm Days and Comfortable Nights

April continues the warming trend, with average highs of 74°F (23.3°C) and lows of 51°F (10.6°C). Rainfall is minimal, and the days are long and sunny. This is a fantastic month for exploring the San Bernardino National Forest and enjoying the blossoming fruit orchards.

May: The Heat Begins to Build

May brings noticeably warmer temperatures, averaging 80°F (26.7°C) for the high and 56°F (13.3°C) for the low. The humidity remains relatively low, making the heat more bearable. It’s a popular time for water sports at nearby lakes and rivers.

June: Officially Summer

June is the official start of summer in San Bernardino. Average highs soar to 87°F (30.6°C), with lows around 61°F (16.1°C). Sunshine is abundant, and the evenings are warm. Be prepared for dry conditions and increased fire risk in the surrounding mountains.

July: Peak Heat

July is the hottest month of the year. Average highs reach 93°F (33.9°C), and temperatures can frequently exceed 100°F (37.8°C). Lows offer little relief, averaging around 65°F (18.3°C). Staying hydrated and seeking shade are essential.

August: Continued Heat, Slight Relief

August remains hot, with average highs similar to July at 92°F (33.3°C) and lows around 64°F (17.8°C). While still very warm, there’s often a slight decrease in the intensity of the heat compared to July. Monsoon moisture can occasionally bring brief, localized thunderstorms.

September: A Welcome Cool Down

September offers a welcome respite from the summer heat. Average highs drop to 86°F (30°C) and lows to 60°F (15.6°C). The humidity remains low, and the weather is generally sunny and pleasant. This is a prime month for outdoor adventures.

October: Crisp Autumn Air

October brings crisp, cool air and beautiful fall foliage, especially in the mountains. Average highs are around 77°F (25°C) and lows around 53°F (11.7°C). Rainfall is still relatively scarce. It’s an excellent time for hiking, biking, and exploring the local wineries.

November: Transitioning to Winter

November marks the transition towards winter. Average highs are 66°F (18.9°C) and lows around 44°F (6.7°C). Rainfall increases, but generally comes in short bursts. The mountains receive their first snowfall of the season.

December: Cool and Festive

December is a cool and festive month in San Bernardino. Average highs are 58°F (14.4°C) and lows around 39°F (3.9°C). Snowfall is possible in the mountains, creating a winter wonderland. Expect occasional rain showers and overcast skies.