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Weather in Nepean for September 2026

Your guide to Nepean weather in September - trends and predictions

    Temperatures

  • Until now, September 2026 in Nepean is slightly cooler than the historical average by 0.7 °C.

  • Expect cooler weather in the next days in Nepean with the forecast suggesting a temperature of 19 °C, lower than the historical average.

  • In general, the average temperature in Nepean at the beginning of September is 24.3 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.6 °C by the end of September.

    • Rain 🌧️

  • Nepean experiences moderate rainfall in September, with an average of 7 rainy days and a total precipitation of 71.9 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
14 km/h
Avg max wind
Average humidity
72 %
Avg humidity

Nepean Weather September

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

Temperatures trend during September in Nepean

See the weather trend as well as the moving average line

September weather in Nepean day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Overcast
Overcast
 24° /12° 42.9 mm 5
2 Sept. Overcast
Overcast
 24° /13° 1.2 mm 5
3 Sept. Sunny
Sunny
 25° /13° 0.1 mm 6
4 Sept. Sunny
Sunny
 26° /14° 1.4 mm 7
5 Sept. Mist
Mist
 25° /12° 0.9 mm 6
6 Sept. Overcast
Overcast
 24° /14° 0.1 mm 6
7 Sept. Light rain shower
Light rain shower
 22° /12° 4.3 mm 5
8 Sept. Light rain
Light rain
 18° /11° 21.6 mm 4
9 Sept. Cloudy
Cloudy
 22° /8° 4.8 mm 4
10 Sept. Overcast
Overcast
 22° /9° 0 mm 6
11 Sept. Sunny
Sunny
 21° /10° 0 mm 5.3
12 Sept. Overcast
Overcast
 23° /11° 0.1 mm 5.3
13 Sept. Patchy rain possible
Patchy rain possible
 25° /16° 3.9 mm 3.6
14 Sept. Sunny
Sunny
 17° /9° 0 mm 5
15 Sept. Overcast
Overcast
 16° /8° 3.3 mm 4
16 Sept. Overcast
Overcast
 22° /15° 1.5 mm 5
17 Sept. Overcast
Overcast
 16° /14° 0 mm 4
18 Sept. Overcast
Overcast
 17° /11° 1.1 mm 5
19 Sept. Sunny
Sunny
 17° /9° 0.1 mm 5
20 Sept. Sunny
Sunny
 19° /9° 0 mm 5
21 Sept. Sunny
Sunny
 20° /11° 0 mm 6
22 Sept. Overcast
Overcast
 20° /11° 0.1 mm 4
23 Sept. Overcast
Overcast
 14° /10° 0 mm 4
24 Sept. Sunny
Sunny
 19° /10° 0 mm 5
25 Sept. Heavy rain
Heavy rain
 18° /11° 56.1 mm 4
26 Sept. Sunny
Sunny
 21° /11° 1.6 mm 5
27 Sept. Cloudy
Cloudy
 20° /8° 0 mm 4
28 Sept. Partly cloudy
Partly cloudy
 22° /10° 0 mm 5
29 Sept. Mist
Mist
 23° /9° 0 mm 5
30 Sept. Partly cloudy
Partly cloudy
 21° /11° 0 mm 5
Next
Important Notice
Our weather forecast for Nepean 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 Nepean forecast closer to your planned date for the most up-to-date weather information.
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Nepean in September - FAQ

What are the expected maximum and minimum temperatures in Nepean 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 Nepean during September?
Moderate rainfall is anticipated in Nepean during September, with a total of 71.9 mm spread over approximately 7 days. Considering plans for rainy days is advisable.

What are the typical wind conditions in Nepean during September?
The average wind speed in Nepean during September is 14 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Nepean

Explore the daily rainfall trends and prepare for Nepeans September weather 💧
Typically, Nepean has 7 rainy days in September with a total of 71.9 mm of rainfall.

UV exposure in Nepean during September

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

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Location coordinates Where is Nepean?

Get accurate weather forecasts for Nepean, located at latitude 45.336 and longitude -75.723. Stay updated with localized weather information tailored for Nepean.

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