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Canada weather

Weather in Grimsby for September 2025

Your guide to Grimsby weather in September - trends and predictions

    Temperatures

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

  • The forecast for the next days in Grimsby predicts temperatures to be around 23 °C, close to the historical average.

  • In general, the average temperature in Grimsby at the beginning of September is 25.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 21.1 °C by the end of September.

    • Rain 🌧️

  • Grimsby experiences moderate rainfall in September, with an average of 10 rainy days and a total precipitation of 67.8 mm.

    • More

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

Average dry days
20
Dry days
Average rainy days
10
Rainy days
Average snowy days
0
Snow days
Average temperatures
23°/14°
Temperatures
Average wind speed
17 km/h
Avg max wind
Average humidity
72 %
Avg humidity

Grimsby Weather September

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

Temperatures trend during September in Grimsby

See the weather trend as well as the moving average line

September weather in Grimsby day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Partly cloudy
Partly cloudy
 24° /13° 0.1 mm 6
2 Sept. Mist
Mist
 23° /12° 0.3 mm 5
3 Sept. Cloudy
Cloudy
 28° /12° 0.5 mm 6
4 Sept. Cloudy
Cloudy
 26° /15° 5 mm 6
5 Sept. Overcast
Overcast
 28° /15° 0 mm 7
6 Sept. Patchy rain possible
Patchy rain possible
 26° /17° 7.7 mm 5
7 Sept. Light rain shower
Light rain shower
 21° /13° 1.8 mm 4
8 Sept. Partly cloudy
Partly cloudy
 21° /12° 0 mm 5
9 Sept. Overcast
Overcast
 23° /12° 0.2 mm 6
10 Sept. Overcast
Overcast
 21° /13° 0 mm 5
11 Sept. Patchy rain possible
Patchy rain possible
 24° /14° 0.1 mm 5
12 Sept. Light rain shower
Light rain shower
 24° /14° 2.1 mm 6
13 Sept. Overcast
Overcast
 23° /12° 0 mm 6
14 Sept. Mist
Mist
 22° /12° 0 mm 5
15 Sept. Partly cloudy
Partly cloudy
 24° /13° 0 mm 6
16 Sept. Mist
Mist
 24° /12° 0 mm 6
17 Sept. Partly cloudy
Partly cloudy
 25° /14° 0 mm 1.3
18 Sept. Mist
Mist
 30° /11° 0 mm 1.3
19 Sept. Overcast
Overcast
 21° /13° 0 mm 1.3
20 Sept. Sunny
Sunny
 19° /12° 0 mm 1.3
21 Sept. Patchy rain possible
Patchy rain possible
 27° /16° 0.5 mm 0
22 Sept. Patchy rain possible
Patchy rain possible
 26° /19° 0.6 mm 5
23 Sept. Patchy rain possible
Patchy rain possible
 24° /20° 0.4 mm 5
24 Sept. Sunny
Sunny
 24° /16° 0 mm 5
25 Sept. Sunny
Sunny
 22° /14° 0 mm 5
26 Sept. Sunny
Sunny
 21° /16° 0 mm 5
27 Sept. Sunny
Sunny
 20° /16° 0 mm 5
28 Sept. Partly cloudy
Partly cloudy
 21° /16° 0 mm 5
29 Sept. Partly cloudy
Partly cloudy
 20° /16° 0 mm 5
30 Sept. Fog
Fog
 20° /14° 0 mm 5
Next
Important Notice
Our weather forecast for Grimsby 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 Grimsby forecast closer to your planned date for the most up-to-date weather information.
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Grimsby in September - FAQ

What are the expected maximum and minimum temperatures in Grimsby during September?
Enjoy moderate daytime temperatures of up to 23° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Grimsby during September?
Moderate rainfall is anticipated in Grimsby during September, with a total of 67.8 mm spread over approximately 10 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Grimsby during September?
The average wind speed in Grimsby during September is 17 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Grimsby

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

UV exposure in Grimsby during September

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

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Get accurate weather forecasts for Grimsby, located at latitude 43.2 and longitude -79.566. Stay updated with localized weather information tailored for Grimsby.

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