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September Weather in Mission, Canada

Last updated: June 18, 2025

In Mission, Canada, the average temperature in September hovers around 14°C (58°F). Expect a comfortable range, with lows of 6°C (42°F) and highs reaching 33°C (91°F). During this month, precipitation totals 199 mm (7.8 in) across approximately 15 days, creating a humidity level of around 76%. Embrace the varied climate while enjoying all that Mission has to offer!

September Temperature in Mission

In September in Mission, the average temperature is 14°C (58°F). Maximum temperatures can reach 33°C (91°F), while minimums can drop as low as 6°C (42°F). It's an ideal time for travelers to enjoy a variety of outdoor activities while being prepared for both warm and cool weather.

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

The chart illustrates September temperature patterns in Mission, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mission, September typically has an average temperature of 14°C (58°F), with highs reaching up to 33°C (91°F) and lows dropping to around 6°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec353340465458636458474135
Data source: Temperature data for Mission generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Mission

In Mission in September, the precipitation amount reaches 199 mm (7.8 in) over a span of 15 days.

September Precipitation Trends in Mission

The chart displays monthly precipitation patterns in Mission, 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 Mission, September typically receives around 199 mm (7.8 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec306263236186100915441199301436339
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Mission

In Mission in September humidity is 76%. With an average temperature of 14°C (58°F), this humidity feels like a warm, thick blanket wrapping around you, making outdoor activities feel sticky and draining, and prompting travelers to seek shade and stay hydrated often.

September Average Humidity in Mission

This chart illustrates the average monthly humidity levels in Mission, 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 Mission is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%86%88%86%82%82%85%77%76%88%88%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Mission

In Mission 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 Mission, you can refer to this Hourly UV Index in Mission.

Maximum UV Index Levels in Mission for September

The chart shows the monthly maximum UV Index (UVI) for Mission 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 Mission typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235678986421
Data source: Mission 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 Mission Compares to Other Months

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

This table compares monthly weather conditions in Mission, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (35°F)306 mm (12.1 inches)87%low
February Weather0°C (33°F)263 mm (10.3 inches)86%moderate
March Weather4°C (40°F)235 mm (9.3 inches)88%moderate
April Weather8°C (46°F)186 mm (7.3 inches)86%high
May Weather12°C (54°F)100 mm (3.9 inches)82%high
June Weather15°C (59°F)91 mm (3.6 inches)82%very high
July Weather17°C (64°F)54 mm (2.1 inches)85%very high
August Weather18°C (64°F)41 mm (1.6 inches)77%very high
September Weather14°C (58°F)199 mm (7.8 inches)76%high
October Weather9°C (48°F)301 mm (11.9 inches)88%moderate
November Weather5°C (41°F)436 mm (17.2 inches)88%low
December Weather2°C (35°F)339 mm (13.4 inches)89%low

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