Regional Municipality of Niagara (St. Catharines)
September
Weather in Regional Municipality of Niagara for September 2025
Your guide to Regional Municipality of Niagara weather in September - trends and predictions
In general, the average temperature in Regional Municipality of Niagara at the beginning of September is 25.3 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.9 °C by the end of September.
Regional Municipality of Niagara sees moderate rainfall in September, averaging 7 rainy days.
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23
Dry days
7
Rainy days
0
Snow days
23°/14°
Temperatures
21 km/h
Avg max wind
72 %
Avg humidity
Regional Municipality of Niagara in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  23° | 2 22° | 3  25° | 4  27° | 5 29° | 6 29° | 7  22° |
| 8 21° | 9  21° | 10 20° | 11 23° | 12 24° | 13 20° | 14 22° |
| 15 23° | 16 23° | 17 21° | 18 21° | 19 22° | 20  22° | 21 25° |
| 22 24° | 23 21° | 24 21° | 25 23° | 26 23° | 27 19° | 28 19° |
| 29 21° | 30 20° |
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Temperatures trend during September in Regional Municipality of Niagara
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Mist | 23° /15° | 0.4 mm | 5 | |
| 2 Sept. | Mist | 22° /14° | 0.2 mm | 6 | |
| 3 Sept. | Thundery outbreaks possible | 25° /16° | 0 mm | 6 | |
| 4 Sept. | Partly cloudy | 27° /17° | 0 mm | 7 | |
| 5 Sept. | Partly cloudy | 29° /18° | 0 mm | 8 | |
| 6 Sept. | Thundery outbreaks possible | 29° /18° | 0.7 mm | 7 | |
| 7 Sept. | Light rain shower | 22° /15° | 4.8 mm | 5 | |
| 8 Sept. | Mist | 21° /13° | 0.1 mm | 5 | |
| 9 Sept. | Overcast | 21° /15° | 0.4 mm | 5 | |
| 10 Sept. | Light rain shower | 20° /16° | 0.5 mm | 5 | |
| 11 Sept. | Overcast | 23° /15° | 0 mm | 5 | |
| 12 Sept. | Mist | 24° /16° | 0.6 mm | 6 | |
| 13 Sept. | Overcast | 20° /14° | 0 mm | 5 | |
| 14 Sept. | Partly cloudy | 22° /14° | 0 mm | 6 | |
| 15 Sept. | Partly cloudy | 23° /14° | 0 mm | 6 | |
| 16 Sept. | Mist | 23° /14° | 0 mm | 6 | |
| 17 Sept. | Mist | 21° /14° | 0.1 mm | 5 | |
| 18 Sept. | Patchy rain possible | 21° /15° | 0.3 mm | 5 | |
| 19 Sept. | Overcast | 22° /13° | 0 mm | 5 | |
| 20 Sept. | Sunny | 22° /13° | 0 mm | 6 | |
| 21 Sept. | Mist | 25° /14° | 1.6 mm | 6 | |
| 22 Sept. | Partly cloudy | 24° /13° | 0 mm | 6 | |
| 23 Sept. | Overcast | 21° /14° | 6.5 mm | 5 | |
| 24 Sept. | Overcast | 21° /13° | 0 mm | 5 | |
| 25 Sept. | Partly cloudy | 23° /16° | 4.2 mm | 6 | |
| 26 Sept. | Mist | 23° /14° | 0 mm | 5 | |
| 27 Sept. | Overcast | 19° /13° | 0 mm | 5 | |
| 28 Sept. | Patchy rain possible | 19° /13° | 1.9 mm | 5 | |
| 29 Sept. | Overcast | 21° /16° | 0 mm | 5 | |
| 30 Sept. | Mist | 20° /14° | 0 mm | 5 | |
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Important Notice
Our weather forecast for Regional Municipality of Niagara in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Regional Municipality of Niagara forecast closer to your planned date for the most up-to-date weather information.
Regional Municipality of Niagara in September - FAQ
What are the expected maximum and minimum temperatures in Regional Municipality of Niagara during September?
Enjoy moderate daytime temperatures of up to 23° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Regional Municipality of Niagara during September?
Expect minimal rainfall in Regional Municipality of Niagara during September, with a total of 10.8 mm over approximately 7 days. This minimal precipitation is unlikely to significantly impact plans.
What are the typical wind conditions in Regional Municipality of Niagara during September?
The average wind speed in Regional Municipality of Niagara during September is 21 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Regional Municipality of Niagara
Explore the daily rainfall trends and prepare for Regional Municipality of Niagaras September weather 💧
UV exposure in Regional Municipality of Niagara during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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