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September Weather in Pasadena, Canada

Last updated: June 18, 2025

In September, the average temperature in Pasadena, Canada is a mild 13°C (55°F), with temperatures ranging from a chilly 1°C (34°F) at night to a pleasant 23°C (74°F) during the day. Expect precipitation totaling 106 mm (4.2 in) over about 15 days, making for a humid atmosphere with an average humidity of 87%.

September Temperature in Pasadena

In September in Pasadena, the average temperature is 13°C (55°F), with maximums reaching 23°C (74°F) and minimums dropping to as low as 1°C (34°F). Be prepared for a range of weather conditions to make the most of your travel experience.

September Weather in Pasadena: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Pasadena, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Pasadena, September typically has an average temperature of 13°C (55°F), with highs reaching up to 23°C (74°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec221925344252596355453729
Data source: Temperature data for Pasadena generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Pasadena

In Pasadena in September, the total precipitation amount is 106 mm (4.2 in) over the course of 15 days.

September Precipitation Trends in Pasadena

The chart displays monthly precipitation patterns in Pasadena, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Pasadena, September typically receives around 106 mm (4.2 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec9011110410094947089107114140139
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Pasadena

In Pasadena in September, humidity is 87%. With an average temperature of 13°C (55°F), this humidity feels like a heavy blanket wrapping around you, making travel sluggish and slightly uncomfortable, as each step seems to cling to the damp air.

September Average Humidity in Pasadena

This chart illustrates the average monthly humidity levels in Pasadena, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Pasadena is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%90%89%88%87%85%90%90%87%84%83%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Pasadena

In Pasadena in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Pasadena, you can refer to this Hourly UV Index in Pasadena.

Maximum UV Index Levels in Pasadena for September

The chart shows the monthly maximum UV Index (UVI) for Pasadena in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Pasadena typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235789886421
Data source: Pasadena September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Pasadena Compares to Other Months

Weather in Pasadena varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Pasadena, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Pasadena, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)90 mm (3.5 inches)88%low
February Weather-7°C (20°F)111 mm (4.4 inches)90%moderate
March Weather-4°C (25°F)104 mm (4.1 inches)89%moderate
April Weather1°C (34°F)100 mm (4.0 inches)88%high
May Weather6°C (43°F)94 mm (3.7 inches)87%very high
June Weather11°C (52°F)94 mm (3.7 inches)85%very high
July Weather15°C (60°F)70 mm (2.8 inches)90%very high
August Weather17°C (63°F)89 mm (3.5 inches)90%very high
September Weather13°C (55°F)106 mm (4.2 inches)87%high
October Weather7°C (46°F)114 mm (4.5 inches)84%moderate
November Weather3°C (37°F)140 mm (5.5 inches)83%low
December Weather-2°C (29°F)139 mm (5.5 inches)85%low

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