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Weather in Nepean for September 2025

Your guide to Nepean weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Nepean is slightly cooler than the historical average by -0.8 °C.

  • Expect cooler weather in the next days in Nepean with the forecast suggesting a temperature of 21 °C, lower than the historical average.

  • In general, the average temperature in Nepean at the beginning of September is 24.4 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18.4 °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 68.9 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
75 %
Avg humidity

Nepean Weather September

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

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
 25° /12° 1.3 mm 6
2 Sept. Overcast
Overcast
 23° /13° 0 mm 5
3 Sept. Mist
Mist
 25° /12° 0 mm 6
4 Sept. Mist
Mist
 27° /14° 1.8 mm 6
5 Sept. Mist
Mist
 26° /12° 0 mm 6
6 Sept. Overcast
Overcast
 25° /14° 0.2 mm 5
7 Sept. Light rain shower
Light rain shower
 20° /12° 5.7 mm 5
8 Sept. Light rain
Light rain
 17° /10° 1.1 mm 5
9 Sept. Cloudy
Cloudy
 22° /7° 0 mm 5
10 Sept. Overcast
Overcast
 22° /8° 0 mm 5
11 Sept. Overcast
Overcast
 24° /11° 0 mm 5
12 Sept. Fog
Fog
 23° /13° 0.1 mm 6
13 Sept. Overcast
Overcast
 20° /12° 0 mm 5
14 Sept. Partly cloudy
Partly cloudy
 22° /13° 0 mm 1.2
15 Sept. Overcast
Overcast
 23° /13° 0 mm 1.2
16 Sept. Overcast
Overcast
 20° /15° 0 mm 1.2
17 Sept. Overcast
Overcast
 28° /15° 0 mm 1.2
18 Sept. Patchy rain possible
Patchy rain possible
 28° /13° 2.4 mm 0
19 Sept. Sunny
Sunny
 17° /7° 0.1 mm 4
20 Sept. Sunny
Sunny
 20° /4° 0 mm 4
21 Sept. Sunny
Sunny
 24° /5° 0 mm 4
22 Sept. Sunny
Sunny
 27° /12° 0 mm 5
23 Sept. Patchy rain possible
Patchy rain possible
 19° /13° 0.8 mm 4
24 Sept. Patchy rain possible
Patchy rain possible
 17° /13° 0.7 mm 4
25 Sept. Partly cloudy
Partly cloudy
 22° /10° 0.1 mm 5
26 Sept. Sunny
Sunny
 12° /5° 0 mm 3
27 Sept. Sunny
Sunny
 15° /2° 0 mm 3
28 Sept. Partly cloudy
Partly cloudy
 20° /9° 0 mm 5
29 Sept. Mist
Mist
 21° /9° 0 mm 5
30 Sept. Partly cloudy
Partly cloudy
 22° /12° 0 mm 6
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 68.9 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 💧

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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