Pasadena weather by month

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Pasadena, California, nestled in the foothills of the San Gabriel Mountains, enjoys a remarkably pleasant Mediterranean climate. Known for its sunny disposition and mild temperatures, Pasadena is a fantastic destination year-round. But knowing what to expect weather-wise can help you plan the perfect trip or simply prepare for the changing seasons if you call Pasadena home. This guide breaks down the weather in Pasadena, month by month, so you’ll always be ready for what Mother Nature has in store.

Spring in Pasadena (March – May)

Spring in Pasadena is arguably one of the most beautiful times of year. The city bursts into bloom, particularly with the rose gardens reaching their peak, and the temperatures are delightfully mild. March can still see occasional rain showers, remnants of the winter season, but these become less frequent as the months progress.

  • March: Temperatures range from highs of 68°F (20°C) to lows of 48°F (9°C). Expect around 3.4 inches of rainfall, with a chance of lingering cool days.

  • April: The weather warms noticeably. Highs average 73°F (23°C) and lows around 53°F (12°C). Rainfall decreases to approximately 1 inch.

  • May: Warm and sunny days become the norm. Highs reach 78°F (26°C), and lows are around 58°F (14°C). May is generally dry, with less than 0.5 inches of rain. Perfect for outdoor activities!

Summer in Pasadena (June – August)

Pasadena summers are warm, dry, and bathed in sunshine. While not as humid as some other parts of the country, temperatures can climb, especially inland. The marine layer often brings morning cloudiness, burning off by midday, offering a comfortable reprieve from the heat.

  • June: Warm days and mild evenings define June. Highs average 83°F (28°C) and lows around 62°F (17°C). Rainfall is practically nonexistent.

  • July: The warmest month of the year! Average highs are 87°F (31°C) and lows around 65°F (18°C). This is the driest time for Pasadena.

  • August: Similar to July, expect hot days and mild nights. Highs average 86°F (30°C), with lows around 64°F (18°C). The heat can be intense, so stay hydrated.

Autumn in Pasadena (September – November)

Autumn is another lovely season in Pasadena. The heat of summer subsides, and the weather remains sunny and pleasant. This is a popular time for events like the Pasadena Chalk Festival. The Santa Ana winds can occasionally bring warmer temperatures and increased fire risk.

  • September: Temperatures begin to cool, with highs around 81°F (27°C) and lows near 62°F (17°C). Still very dry.

  • October: A beautiful, mild month. Highs average 76°F (24°C) and lows are around 57°F (14°C). Rainfall starts to become a possibility, but typically remains low.

  • November: Cooler temperatures and a higher chance of rain mark November. Highs reach 68°F (20°C) and lows drop to 48°F (9°C). Expect around 1.7 inches of rainfall.

Winter in Pasadena (December – February)

Pasadena winters are mild and wet compared to many other parts of the United States. While snowfall is rare, rainfall is common, contributing to the lush green landscape. The Rose Parade in January is a major event, often enjoyed in chilly but sunny conditions.

  • December: Cool and damp. Highs average 65°F (18°C) and lows around 45°F (7°C). Expect approximately 2.6 inches of rainfall.

  • January: One of the coolest and wettest months. Highs average 64°F (18°C) and lows around 44°F (7°C). Average rainfall is around 3.7 inches.

  • February: Similar to January, with cool temperatures and moderate rainfall. Highs average 66°F (19°C) and lows around 45°F (7°C). Expect around 3 inches of rainfall.

Pasadena Weather By Month – Quick Reference Table

Month Avg. High (°F) Avg. Low (°F) Avg. Rainfall (inches) Typical Conditions
March 68 48 3.4 Mild, occasional showers
April 73 53 1.0 Warming, mostly dry
May 78 58 0.5 Warm and sunny
June 83 62 0.0 Warm, dry, sunny
July 87 65 0.0 Hot, dry, sunny
August 86 64 0.0 Hot, dry, sunny
September 81 62 0.0 Cooling, dry
October 76 57 0.8 Mild, pleasant, some rain possible
November 68 48 1.7 Cooler, increasing rain
December 65 45 2.6 Cool, damp, possibility of rain
January 64 44 3.7 Coolest, wettest month
February 66 45 3.0 Cool, moderate rainfall

Frequently Asked Questions (FAQ)

Q1: Does it ever snow in Pasadena?
A1: Snow is very rare in Pasadena, occurring only a few times per century.

Q2: What is the marine layer?
A2: It’s a layer of clouds that forms over the Pacific Ocean and drifts inland, often bringing cool, cloudy mornings that burn off by afternoon.

Q3: What should I pack for a trip to Pasadena in October?
A3: Layers are key! Pack for warm daytime temperatures (70s) and cooler evenings (50s). A light jacket or sweater is recommended.

Q4: Is Pasadena humid?
A4: No, Pasadena has relatively low humidity, especially during the summer months.

Q5: Are Santa Ana winds common in Pasadena?
A5: Yes, particularly in the fall. They can bring warm, dry conditions and increase fire danger.

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