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Australia weather

Weather in Hornsby for September 2026

Your guide to Hornsby weather in September - trends and predictions

    Temperatures

  • So far, September 2026 in Hornsby is slightly warmer than the historical average by 2 °C.

  • The forecast for the coming days of September 2026 predicts a temperature of 28.6 °C , which is warmer than usual.

  • In general, the average temperature in Hornsby at the beginning of September is 22.6 °C. As the month progressed, temperatures tended to significantly warm up, reaching an average of 29.3 °C by the end of September.

    • Rain 🌧️

  • Hornsby experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 31.7 mm.

    • More

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

Average dry days
22
Dry days
Average rainy days
8
Rainy days
Average snowy days
0
Snow days
Average temperatures
22°/11°
Temperatures
Average wind speed
20 km/h
Avg max wind
Average humidity
56 %
Avg humidity

Hornsby Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
22°
2
Sunny
22°
3
Sunny
20°
4
Partly cloudy
22°
5
Patchy rain possible
25°
6
Sunny
23°
7
Partly cloudy
24°
8
Patchy light rain
22°
9
Sunny
21°
10
Patchy rain possible
18°
11
Sunny
19°
12
Partly cloudy
20°
13
Sunny
21°
14
Sunny
23°
15
Overcast
22°
16
Sunny
16°
17
Sunny
19°
18
Sunny
27°
19
Sunny
31°
20
Sunny
32°
21
Sunny
26°
22
Sunny
30°
23
Sunny
34°
24
Sunny
34°
25
Sunny
33°
26
Sunny
34°
27
Overcast
31°
28
Overcast
25°
29
Light rain shower
23°
30
Sunny
25°

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. Sunny
Sunny
 22° /9° 0.5 mm 5
2 Sept. Sunny
Sunny
 22° /10° 0.1 mm 5
3 Sept. Sunny
Sunny
 20° /9° 0 mm 6
4 Sept. Partly cloudy
Partly cloudy
 22° /9° 0 mm 6
5 Sept. Patchy rain possible
Patchy rain possible
 25° /10° 0.4 mm 6
6 Sept. Sunny
Sunny
 23° /12° 0 mm 6
7 Sept. Partly cloudy
Partly cloudy
 24° /11° 0.4 mm 6
8 Sept. Patchy light rain
Patchy light rain
 22° /12° 1.4 mm 6
9 Sept. Sunny
Sunny
 21° /10° 0.8 mm 5
10 Sept. Patchy rain possible
Patchy rain possible
 18° /8° 6.9 mm 5
11 Sept. Sunny
Sunny
 19° /9° 1.9 mm 5
12 Sept. Partly cloudy
Partly cloudy
 20° /9° 1.2 mm 6
13 Sept. Sunny
Sunny
 21° /10° 0.2 mm 6
14 Sept. Sunny
Sunny
 23° /9° 0 mm 6
15 Sept. Overcast
Overcast
 22° /9° 0.1 mm 6
16 Sept. Sunny
Sunny
 16° /10° 0.2 mm 6.4
17 Sept. Sunny
Sunny
 19° /7° 0 mm 5.5
18 Sept. Sunny
Sunny
 27° /7° 0 mm 8
19 Sept. Sunny
Sunny
 31° /10° 0 mm 9
20 Sept. Sunny
Sunny
 32° /12° 0 mm 9
21 Sept. Sunny
Sunny
 26° /16° 0 mm 8
22 Sept. Sunny
Sunny
 30° /17° 0 mm 8
23 Sept. Sunny
Sunny
 34° /15° 0 mm 9
24 Sept. Sunny
Sunny
 34° /19° 0 mm 9
25 Sept. Sunny
Sunny
 33° /18° 0 mm 9
26 Sept. Sunny
Sunny
 34° /17° 0 mm 9
27 Sept. Overcast
Overcast
 31° /19° 2.5 mm 8
28 Sept. Overcast
Overcast
 25° /15° 1.3 mm 7
29 Sept. Light rain shower
Light rain shower
 23° /13° 1.1 mm 6
30 Sept. Sunny
Sunny
 25° /12° 1.4 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 31.7 mm across approximately 8 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 💧
Typically, Hornsby has 8 rainy days in September with a total of 31.7 mm of rainfall.

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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