Pasadena

Stay informed about the latest weather conditions in Pasadena. Below, you will find real-time data, forecasts, and helpful weather charts to help you plan your day.

The climate in Pasadena can be described as Mediterranean or semi-arid, characterized by very mild winters and hot, dry summers. The city enjoys a wealth of sunny days throughout the year. Average annual temperatures are comfortable without extreme fluctuations, making Pasadena an attractive destination to visit at any time.

Pasadena has two distinct primary seasons. Summer, lasting roughly from June to September, is very warm and sunny, with average high temperatures often exceeding 30°C, particularly in July and August. Rainfall during the summer months is minimal and often non-existent, highlighting the arid nature of this period. Winter, from December to March, is mild, with average temperatures around 12-14°C. While winter is the wetter season compared to summer, total precipitation remains relatively low, occurring mostly as brief showers.

Spring and autumn are pleasant transitional seasons with moderate temperatures and light rainfall. Overall, the weather in Pasadena is stable and predictable, with an emphasis on dry, sunny summers. Travelers should expect plenty of sunshine and a minimal number of rainy days, especially between April and November.

The climate in Pasadena is characterized by distinct seasonal temperature changes throughout the year. The hottest months are traditionally July and August, when average air temperatures reach 26.1°C and 26.3°C, respectively. During these summer months, daytime highs often rise above 32°C, creating truly warm weather. The coolest period is winter, particularly February, with an average temperature of about 12.0°C and nighttime lows dropping to 6.2°C. January and December are also cool, with average temperatures of 12.6°C and 13.1°C, respectively.

Summer months in Pasadena, especially from June to September, offer consistently warm weather that transitions into heat by mid-season. The average temperature in June is 22.8°C, gradually rising toward August. Summer is characterized by significant daily temperature fluctuations. For example, in July, the average high reaches 32.4°C, while at night, the temperature can drop to 19.7°C. A similar pattern is observed in August: daytime heat of up to 32.5°C is followed by cooler nights around 20.0°C. These variations make the evenings and nights quite comfortable after a hot day.

Winter in Pasadena, spanning from December to February, is notably mild. Average temperatures during these months range from 12.0°C to 13.1°C. During the day, the air usually warms up to 17-19°C, creating pleasant conditions for this time of year. At night, however, the temperature drops significantly, reaching lows of 6-7°C. Daily temperature fluctuations remain noticeable in winter, though they are not as sharp as in the summer. For instance, in January, the difference between the average maximum (18.0°C) and minimum (7.1°C) temperature is about 11 degrees.

The city of Pasadena experiences distinct seasonal precipitation, with relatively wet winters and very dry summers. Overall, the total amount of rainfall is low throughout the year.

The highest amount of precipitation falls during the winter months and early spring. January, February, and March are the wettest, with an average of about 3 mm of rainfall in each of these months. March stands out with the highest number of rainy days, averaging 11 days. Given the low precipitation volumes, these are typically light or moderate rains rather than heavy downpours. Snow in Pasadena, based on climate data, is an extremely rare phenomenon.

From April to November, Pasadena settles into a long dry season. Precipitation during these months is minimal, amounting to only 1 mm in most months, while July sees no precipitation at all (0 mm). July is also the month with the fewest rainy days—only about 2. During the rest of the dry period (April-June, August-November), the number of rainy days ranges from 3 to 4.

In summary, when planning a trip to Pasadena, expect more rainy days from January to March, while from late spring to mid-autumn, the weather is predominantly dry and sunny.

When planning a trip to Pasadena, keep in mind that the weather is generally mild and sunny year-round. Regardless of the season, your best companions will be comfortable walking shoes for exploring the city and its surroundings, as well as sunscreen, sunglasses, and a hat, as the California sun can be quite intense. Layering your clothing is an excellent strategy for Pasadena, allowing you to stay comfortable during temperature fluctuations throughout the day, especially during the transitional seasons.

During the summer months from June to August, when average temperatures hover around 22-26°C and highs can climb above 30°C, your primary wardrobe should consist of light, breathable clothing: t-shirts, shorts, dresses, and sundresses. Evenings can be slightly cooler, so a light sweater, cardigan, or thin jacket will be useful. Rain is very rare during this time, so you likely won't need an umbrella.

In winter (December to February) and the shoulder seasons (March-April and October-November), the weather turns cooler: average temperatures range from 12°C to 20°C, and nighttime lows can drop to 6-10°C. For these periods, pack sweaters, jeans or heavy trousers, and a mid-season jacket. While heavy rain is unlikely (precipitation rarely exceeds 3 mm per month), the period from January to March sees the highest number of days with light rain, so a small folding umbrella or a lightweight waterproof windbreaker might come in handy for comfortable sightseeing.