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Australia weather

Weather in Hornsby for September 2025

Your guide to Hornsby weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Hornsby is slightly cooler than the historical average by -1.1 °C.

  • The forecast for the next days in Hornsby predicts temperatures to be around 21 °C, close to the historical average.

  • In general, the average temperature in Hornsby at the beginning of September is 21.1 °C. As the month progressed, temperatures tended to slightly decrease, reaching an average of 20.9 °C by the end of September.

    • Rain 🌧️

  • Hornsby experiences moderate rainfall in September, with an average of 7 rainy days and a total precipitation of 26.3 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
23
Dry days
Average rainy days
7
Rainy days
Average snowy days
0
Snow days
Average temperatures
22°/11°
Temperatures
Average wind speed
20 km/h
Avg max wind
Average humidity
54 %
Avg humidity

Hornsby Weather September

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

Temperatures trend during September in Hornsby

See the weather trend as well as the moving average line

September weather in Hornsby day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Light rain shower
Light rain shower
 20° /9° 0.7 mm 6
2 Sept. Cloudy
Cloudy
 20° /9° 0.2 mm 6
3 Sept. Sunny
Sunny
 18° /8° 0 mm 6
4 Sept. Partly cloudy
Partly cloudy
 21° /8° 0 mm 7
5 Sept. Patchy rain possible
Patchy rain possible
 22° /10° 0.5 mm 6
6 Sept. Sunny
Sunny
 23° /11° 0 mm 7
7 Sept. Partly cloudy
Partly cloudy
 24° /11° 0 mm 7
8 Sept. Patchy light rain
Patchy light rain
 24° /12° 1.7 mm 7
9 Sept. Sunny
Sunny
 21° /11° 0.7 mm 6
10 Sept. Sunny
Sunny
 18° /8° 9.2 mm 6
11 Sept. Sunny
Sunny
 19° /9° 2.5 mm 6
12 Sept. Partly cloudy
Partly cloudy
 19° /9° 1.5 mm 6
13 Sept. Sunny
Sunny
 19° /9° 0.2 mm 6
14 Sept. Sunny
Sunny
 22° /9° 0 mm 7
15 Sept. Overcast
Overcast
 21° /9° 0.2 mm 6
16 Sept. Sunny
Sunny
 26° /15° 0 mm 1.3
17 Sept. Sunny
Sunny
 23° /14° 0 mm 1.4
18 Sept. Sunny
Sunny
 21° /10° 0 mm 1.6
19 Sept. Patchy rain possible
Patchy rain possible
 23° /11° 0.4 mm 1.5
20 Sept. Sunny
Sunny
 24° /13° 0 mm 6
21 Sept. Sunny
Sunny
 20° /11° 0 mm 5
22 Sept. Patchy rain possible
Patchy rain possible
 21° /11° 0.2 mm 5
23 Sept. Patchy rain possible
Patchy rain possible
 17° /12° 0.2 mm 4
24 Sept. Patchy rain possible
Patchy rain possible
 22° /14° 0.4 mm 5
25 Sept. Sunny
Sunny
 21° /11° 0 mm 6
26 Sept. Sunny
Sunny
 27° /12° 0 mm 6
27 Sept. Sunny
Sunny
 22° /12° 0 mm 6
28 Sept. Patchy rain possible
Patchy rain possible
 16° /9° 0.3 mm 4
29 Sept. Moderate rain
Moderate rain
 15° /9° 5.4 mm 4
30 Sept. Sunny
Sunny
 23° /12° 2 mm 7
Next
Important Notice
Our weather forecast for Hornsby 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 Hornsby forecast closer to your planned date for the most up-to-date weather information.
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Hornsby in September - FAQ

What are the expected maximum and minimum temperatures in Hornsby during September?
Enjoy moderate daytime temperatures of up to 22° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Hornsby during September?
In September, Hornsby can expect light to moderate rainfall, totaling 26.3 mm across approximately 7 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Hornsby during September?
The average wind speed in Hornsby during September is 20 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Hornsby

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

UV exposure in Hornsby during September

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

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Location coordinates Where is Hornsby?

Get accurate weather forecasts for Hornsby, located at latitude -33.702 and longitude 151.099. Stay updated with localized weather information tailored for Hornsby.

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