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September Weather in Summerside, United States

Last updated: June 24, 2025

In Summerside, United States, the average temperature in September hovers around 21°C (70°F), offering a pleasant climate. Daily temperatures can fluctuate, dipping to a cool 7°C (44°F) and rising to a warm 35°C (95°F). Be prepared for some rain, as the area receives about 95 mm (3.7 in) of precipitation spread over 8 days. Additionally, you can expect an average humidity level of 73%, ensuring a refreshing atmosphere.

September Temperature in Summerside

In September, in Summerside, the average temperature is 21°C (70°F). Maximums can reach 35°C (95°F) and minimums can be as low as 7°C (44°F). It's an ideal time to visit for those who enjoy mild weather but be prepared for both warm and cool conditions.

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

The chart illustrates September temperature patterns in Summerside, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Summerside, September typically has an average temperature of 21°C (70°F), with highs reaching up to 35°C (95°F) and lows dropping to around 7°C (44°F).
JanFebMarAprMayJunJulAugSepOctNovDec343745546673777570594439
Data source: Temperature data for Summerside 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 Summerside

In Summerside in September, the total precipitation amount is 95 mm (3.7 in) spread over 8 days.

September Precipitation Trends in Summerside

The chart displays monthly precipitation patterns in Summerside, 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 Summerside, September typically receives around 95 mm (3.7 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec8311613913413614911789959998119
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Summerside

In Summerside in September, humidity is 73%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace that can make outdoor activities feel sweltering, so it's essential to stay hydrated and take breaks in the shade while exploring.

September Average Humidity in Summerside

This chart illustrates the average monthly humidity levels in Summerside, 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 Summerside is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%87%85%81%82%81%73%73%78%89%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Summerside

In Summerside in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Summerside.

Maximum UV Index Levels in Summerside for September

The chart shows the monthly maximum UV Index (UVI) for Summerside 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 Summerside typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098643
Data source: Summerside 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 Summerside Compares to Other Months

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

This table compares monthly weather conditions in Summerside, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)83 mm (3.3 inches)88%moderate
February Weather3°C (38°F)116 mm (4.6 inches)88%moderate
March Weather7°C (46°F)139 mm (5.5 inches)87%high
April Weather12°C (55°F)134 mm (5.3 inches)85%very high
May Weather19°C (66°F)136 mm (5.4 inches)81%very high
June Weather23°C (73°F)149 mm (5.9 inches)82%very high
July Weather25°C (77°F)117 mm (4.6 inches)81%very high
August Weather24°C (75°F)89 mm (3.5 inches)73%very high
September Weather21°C (70°F)95 mm (3.7 inches)73%very high
October Weather15°C (59°F)99 mm (3.9 inches)78%high
November Weather7°C (44°F)98 mm (3.9 inches)89%moderate
December Weather4°C (39°F)119 mm (4.7 inches)87%moderate

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