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Weather in Saint John County for September 2025

Your guide to Saint John County weather in September - trends and predictions
  • In general, the average temperature in Saint John County at the beginning of September is 20.4 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 17.6 °C by the end of September.

  • Saint John County sees moderate rainfall in September, averaging 10 rainy days.

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Average dry days
20
Dry days
Average rainy days
10
Rainy days
Average snowy days
0
Snow days
Average temperatures
19°/11°
Temperatures
Average wind speed
15 km/h
Avg max wind
Average humidity
85 %
Avg humidity

Saint John County in September average weather

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Temperatures trend during September in Saint John County

See the weather trend as well as the moving average line

September weather day by day

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Date Weather Temperatures Rain UV More
1 Sept. Sunny
Sunny
19° /10° 10.8 mm 5
2 Sept. Overcast
Overcast
20° /11° 0.8 mm 5
3 Sept. Overcast
Overcast
19° /10° 0 mm 5
4 Sept. Fog
Fog
20° /11° 0 mm 5
5 Sept. Fog
Fog
23° /13° 0 mm 6
6 Sept. Overcast
Overcast
22° /12° 0 mm 5
7 Sept. Mist
Mist
20° /14° 0.6 mm 5
8 Sept. Light rain shower
Light rain shower
18° /11° 4.3 mm 5
9 Sept. Fog
Fog
17° /10° 3.5 mm 5
10 Sept. Light rain shower
Light rain shower
19° /11° 7.2 mm 4
11 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
18° /10° 12.1 mm 5
12 Sept. Fog
Fog
19° /12° 0 mm 5
13 Sept. Fog
Fog
19° /12° 3.3 mm 5
14 Sept. Heavy rain
Heavy rain
19° /12° 5.4 mm 5
15 Sept. Overcast
Overcast
19° /8° 0 mm 5
16 Sept. Light rain shower
Light rain shower
20° /12° 33.8 mm 5
17 Sept. Overcast
Overcast
19° /12° 4.9 mm 5
18 Sept. Light drizzle
Light drizzle
16° /11° 1.8 mm 4
19 Sept. Moderate rain
Moderate rain
18° /12° 3.8 mm 4
20 Sept. Patchy rain possible
Patchy rain possible
17° /13° 0 mm 4
21 Sept. Mist
Mist
18° /10° 0 mm 4
22 Sept. Sunny
Sunny
16° /8° 0 mm 5
23 Sept. Overcast
Overcast
15° /9° 0 mm 4
24 Sept. Mist
Mist
18° /10° 0 mm 5
25 Sept. Patchy rain possible
Patchy rain possible
17° /10° 0.1 mm 4
26 Sept. Sunny
Sunny
16° /7° 4.9 mm 4
27 Sept. Sunny
Sunny
18° /9° 37.1 mm 5
28 Sept. Mist
Mist
18° /8° 0 mm 5
29 Sept. Fog
Fog
17° /9° 0 mm 4
30 Sept. Mist
Mist
19° /9° 0 mm 4
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Important Notice
Our weather forecast for Saint John County 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 Saint John County forecast closer to your planned date for the most up-to-date weather information.

Saint John County in September - FAQ

What are the expected maximum and minimum temperatures in Saint John County during September?
Enjoy moderate daytime temperatures of up to 19° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Saint John County during September?
Significant rainfall exceeding 151.1 mm is expected in Saint John County during September, occurring over more than 10 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Saint John County during September?
The average wind speed in Saint John County during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Saint John County

Explore the daily rainfall trends and prepare for Saint John Countys September weather 💧

UV exposure in Saint John County during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Location coordinates Where is Saint John County?

Get accurate weather forecasts for Saint John County, located at latitude 45.271 and longitude -66.056. Stay updated with localized weather information tailored for Saint John County.

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