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Weather in Hamilton for September 2025

Your guide to Hamilton weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Hamilton is slightly cooler than the historical average by -1.8 °C.

  • Expect cooler weather in the next days in Hamilton with the forecast suggesting a temperature of 21.2 °C, lower than the historical average.

  • In general, the average temperature in Hamilton at the beginning of September is 25.3 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18.9 °C by the end of September.

    • Rain 🌧️

  • Hamilton experiences moderate rainfall in September, with an average of 10 rainy days and a total precipitation of 67.8 mm.

    • More

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Average dry days
20
Dry days
Average rainy days
10
Rainy days
Average snowy days
0
Snow days
Average temperatures
23°/14°
Temperatures
Average wind speed
17 km/h
Avg max wind
Average humidity
72 %
Avg humidity

Hamilton Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Partly cloudy
25°
2
Mist
23°
3
Cloudy
28°
4
Cloudy
27°
5
Overcast
28°
6
Patchy rain possible
26°
7
Light rain shower
20°
8
Partly cloudy
21°
9
Overcast
23°
10
Overcast
21°
11
Patchy rain possible
24°
12
Light rain shower
24°
13
Overcast
23°
14
Sunny
25°
15
Mist
20°
16
Partly cloudy
23°
17
Mist
26°
18
Sunny
30°
19
Sunny
19°
20
Sunny
17°
21
Sunny
21°
22
Patchy rain possible
21°
23
Patchy rain possible
21°
24
Patchy rain possible
23°
25
Patchy rain possible
21°
26
Sunny
15°
27
Sunny
15°
28
Patchy rain possible
19°
29
Overcast
19°
30
Fog
20°

Temperatures trend during September in Hamilton

See the weather trend as well as the moving average line

September weather in Hamilton day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Partly cloudy
Partly cloudy
 25° /14° 0.1 mm 6
2 Sept. Mist
Mist
 23° /13° 0.3 mm 5
3 Sept. Cloudy
Cloudy
 28° /13° 0.5 mm 6
4 Sept. Cloudy
Cloudy
 27° /15° 4.8 mm 6
5 Sept. Overcast
Overcast
 28° /15° 0 mm 6
6 Sept. Patchy rain possible
Patchy rain possible
 26° /16° 7.7 mm 6
7 Sept. Light rain shower
Light rain shower
 20° /14° 1.8 mm 4
8 Sept. Partly cloudy
Partly cloudy
 21° /11° 0 mm 5
9 Sept. Overcast
Overcast
 23° /11° 0.2 mm 5
10 Sept. Overcast
Overcast
 21° /13° 0 mm 5
11 Sept. Patchy rain possible
Patchy rain possible
 24° /14° 0.1 mm 5
12 Sept. Light rain shower
Light rain shower
 24° /14° 2.1 mm 6
13 Sept. Overcast
Overcast
 23° /14° 0 mm 6
14 Sept. Sunny
Sunny
 25° /14° 0 mm 1.2
15 Sept. Mist
Mist
 20° /15° 0 mm 1.4
16 Sept. Partly cloudy
Partly cloudy
 23° /16° 0 mm 1.3
17 Sept. Mist
Mist
 26° /12° 0 mm 1.3
18 Sept. Sunny
Sunny
 30° /16° 0 mm 0
19 Sept. Sunny
Sunny
 19° /13° 0 mm 5
20 Sept. Sunny
Sunny
 17° /11° 0 mm 4
21 Sept. Sunny
Sunny
 21° /11° 0 mm 5
22 Sept. Patchy rain possible
Patchy rain possible
 21° /14° 1.5 mm 4
23 Sept. Patchy rain possible
Patchy rain possible
 21° /17° 3.8 mm 4
24 Sept. Patchy rain possible
Patchy rain possible
 23° /16° 3.8 mm 4
25 Sept. Patchy rain possible
Patchy rain possible
 21° /15° 4.2 mm 4
26 Sept. Sunny
Sunny
 15° /9° 0 mm 4
27 Sept. Sunny
Sunny
 15° /7° 0 mm 4
28 Sept. Patchy rain possible
Patchy rain possible
 19° /14° 1.7 mm 5
29 Sept. Overcast
Overcast
 19° /16° 1.6 mm 4
30 Sept. Fog
Fog
 20° /14° 0 mm 5
Next
Important Notice
Our weather forecast for Hamilton 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 Hamilton forecast closer to your planned date for the most up-to-date weather information.
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Hamilton in September - FAQ

What are the expected maximum and minimum temperatures in Hamilton 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 Hamilton during September?
Moderate rainfall is anticipated in Hamilton during September, with a total of 67.8 mm spread over approximately 10 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Hamilton during September?
The average wind speed in Hamilton during September is 17 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Hamilton

Explore the daily rainfall trends and prepare for Hamiltons September weather 💧

UV exposure in Hamilton during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

Quick links

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Location coordinates Where is Hamilton?

Get accurate weather forecasts for Hamilton, located at latitude 43.25 and longitude -79.85. Stay updated with localized weather information tailored for Hamilton.

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