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Weather in Runcorn for September 2025

Your guide to Runcorn weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Runcorn is slightly cooler than the historical average by -1.5 °C.

  • Expect cooler weather in the next days in Runcorn with the forecast suggesting a temperature of 16.2 °C, lower than the historical average.

  • In general, the average temperature in Runcorn at the beginning of September is 21.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 15.6 °C by the end of September.

    • Rain 🌧️

  • Runcorn experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 101.1 mm.

    • More

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

Average dry days
7
Dry days
Average rainy days
23
Rainy days
Average snowy days
0
Snow days
Average temperatures
18°/11°
Temperatures
Average wind speed
18 km/h
Avg max wind
Average humidity
77 %
Avg humidity

Runcorn Weather September

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

Temperatures trend during September in Runcorn

See the weather trend as well as the moving average line

September weather in Runcorn 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
 19° /12° 2.8 mm 4
2 Sept. Patchy rain possible
Patchy rain possible
 21° /11° 2.5 mm 5
3 Sept. Cloudy
Cloudy
 20° /12° 3.1 mm 4
4 Sept. Sunny
Sunny
 21° /11° 0.6 mm 5
5 Sept. Sunny
Sunny
 21° /11° 0.7 mm 5
6 Sept. Overcast
Overcast
 25° /13° 0 mm 6
7 Sept. Light rain shower
Light rain shower
 24° /14° 1.5 mm 5
8 Sept. Patchy rain possible
Patchy rain possible
 23° /13° 3 mm 5
9 Sept. Overcast
Overcast
 21° /12° 2.2 mm 5
10 Sept. Light rain shower
Light rain shower
 20° /12° 3.6 mm 5
11 Sept. Light rain shower
Light rain shower
 16° /10° 4.3 mm 4
12 Sept. Light rain shower
Light rain shower
 16° /9° 3.4 mm 4
13 Sept. Overcast
Overcast
 16° /7° 3.2 mm 4
14 Sept. Cloudy
Cloudy
 17° /10° 3.6 mm 4
15 Sept. Light rain shower
Light rain shower
 18° /12° 1.8 mm 4
16 Sept. Overcast
Overcast
 17° /10° 0.4 mm 5
17 Sept. Moderate rain
Moderate rain
 20° /11° 8.1 mm 0.5
18 Sept. Patchy rain possible
Patchy rain possible
 20° /12° 2.6 mm 0.4
19 Sept. Cloudy
Cloudy
 23° /15° 0.1 mm 0.6
20 Sept. Heavy rain
Heavy rain
 14° /11° 24.6 mm 0.2
21 Sept. Moderate rain
Moderate rain
 13° /8° 11.7 mm 0.5
22 Sept. Sunny
Sunny
 13° /5° 0 mm 3
23 Sept. Patchy rain possible
Patchy rain possible
 15° /7° 0.2 mm 3
24 Sept. Patchy rain possible
Patchy rain possible
 16° /10° 0.1 mm 3
25 Sept. Partly cloudy
Partly cloudy
 16° /7° 0 mm 4
26 Sept. Sunny
Sunny
 16° /6° 0 mm 4
27 Sept. Overcast
Overcast
 15° /6° 0 mm 3
28 Sept. Patchy rain possible
Patchy rain possible
 15° /9° 0.3 mm 3
29 Sept. Sunny
Sunny
 15° /8° 0 mm 4
30 Sept. Sunny
Sunny
 16° /7° 0 mm 4
Next
Important Notice
Our weather forecast for Runcorn 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 Runcorn forecast closer to your planned date for the most up-to-date weather information.
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Runcorn in September - FAQ

What are the expected maximum and minimum temperatures in Runcorn during September?
Enjoy moderate daytime temperatures of up to 18° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Runcorn during September?
Significant rainfall exceeding 101.1 mm is expected in Runcorn during September, occurring over more than 23 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Runcorn during September?
The average wind speed in Runcorn during September is 18 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Runcorn

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

UV exposure in Runcorn during September

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

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Location coordinates Where is Runcorn?

Get accurate weather forecasts for Runcorn, located at latitude 53.342 and longitude -2.731. Stay updated with localized weather information tailored for Runcorn.

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