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September Weather in Watford, Canada

Last updated: June 18, 2025

In Watford, Canada, the average temperature in September hovers around 18°C (65°F). While you can expect minimum temperatures to dip as low as 5°C (41°F), it’s also possible to enjoy pleasant highs of 30°C (86°F). Be prepared for some rain, with an average precipitation amount of 87 mm (3.4 in) spread over 12 days. And with a notable average humidity of 81%, make sure to stay hydrated!

September Temperature in Watford

In September in Watford, the average temperature is 18°C (65°F). Maximums can reach 30°C (86°F), while minimums can dip as low as 5°C (41°F). This makes it a great time to explore Watford while enjoying comfortable weather for outdoor activities.

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

The chart illustrates September temperature patterns in Watford, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Watford, September typically has an average temperature of 18°C (65°F), with highs reaching up to 30°C (86°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec272834435465717165544033
Data source: Temperature data for Watford 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 Watford

In Watford in September, the precipitation amount is 87 mm (3.4 in) over the course of 12 days.

September Precipitation Trends in Watford

The chart displays monthly precipitation patterns in Watford, 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 Watford, September typically receives around 87 mm (3.4 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec818280109104878499881389975
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Watford

In Watford in September, humidity is 81%. With an average temperature of 18°C (65°F), this humidity feels like a thick blanket wrapping around you, making every step feel heavier and the air thick and sultry—a challenging environment for traveling.

September Average Humidity in Watford

This chart illustrates the average monthly humidity levels in Watford, 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 Watford is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%88%87%83%81%79%80%81%84%88%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Watford

In Watford in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Watford.

Maximum UV Index Levels in Watford for September

The chart shows the monthly maximum UV Index (UVI) for Watford 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 Watford typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458910997532
Data source: Watford 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 Watford Compares to Other Months

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

This table compares monthly weather conditions in Watford, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)81 mm (3.2 inches)90%low
February Weather-2°C (28°F)82 mm (3.2 inches)90%moderate
March Weather1°C (35°F)80 mm (3.1 inches)87%moderate
April Weather6°C (43°F)109 mm (4.3 inches)87%very high
May Weather12°C (54°F)104 mm (4.1 inches)82%very high
June Weather18°C (65°F)87 mm (3.4 inches)81%very high
July Weather22°C (72°F)84 mm (3.3 inches)79%very high
August Weather22°C (71°F)99 mm (3.9 inches)80%very high
September Weather18°C (65°F)87 mm (3.4 inches)81%high
October Weather12°C (54°F)138 mm (5.4 inches)84%moderate
November Weather4°C (40°F)99 mm (3.9 inches)88%moderate
December Weather1°C (33°F)74 mm (2.9 inches)87%low

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