Climate Insights for Pasadena

The climate in Pasadena is temperate. The average annual temperature is 15°C and approximately 1197mm of precipitation falls per year. Pasadena receives a notable amount of rainfall throughout the year, including during its driest month. Pasadena is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, June. The coldest months are January, February, December, when temperatures can drop to -2°C. Snowfall occurs from January to March, with around 78cm accumulating over the season.

Temperatures in Pasadena vary considerably across the year, with a 32°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 30°C and the mean temperature sits around 27°C. The coldest month is January, when overnight lows fall to -2°C and the daily average is 1°C. Daily temperature variation is modest, with an average difference of 7°C between highs and lows. The sharpest temperature change occurs between February and March, with a 7°C shift in average temperatures.

Pasadena is a moderately rainy area, receiving approximately 1197mm of precipitation annually, which averages out to around 100mm per month. The wettest month is September, averaging 188mm of rainfall. May and July also tend to see above-average precipitation. The driest month is November, with just 38mm. That's 151mm less than September, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall. Snowfall is a regular feature from January to March, with around 78cm accumulating over the season. January typically sees the most snow at around 61cm.

Pasadena is relatively calm, with an average annual wind speed of 3km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 4km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 2km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 2km/h gap between the calmest and windiest months.

It is currently summer in Pasadena, which began on June 21, 2026. Pasadena is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 30°C, while the coldest stretch bottoms out in January near -2°C. Autumn is next, beginning on September 23, 2026 — 52 days from now.

The best time to visit Pasadena is during October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 16°C with modest rainfall averaging 63mm per month. By contrast, August can be uncomfortably hot with highs reaching 30°C, while January is the coldest period with lows dropping to -2°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Pasadena based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.