Weather in Saint John County for September 2026
Until now, September 2026 in Saint John County has been nearly identical to the historical average, with a temperature of 18.2 °C (showing only a slight deviation of 0.4 °C).
The forecast for the next days in Saint John County predicts temperatures to be around 18 °C, close to the historical average.
In general, the average temperature in Saint John County at the beginning of September is 19 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 17.4 °C by the end of September.
Saint John County in September brings notable rainfall, with an average of 16 rainy days and a total precipitation of 146.7 mm.
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Saint John County Weather September
Temperatures trend during September in Saint John County
September weather in Saint John County day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Sunny | 20° /10° | 5.4 mm | 6 | |
| 2 Sept. |  Fog | 20° /11° | 0.4 mm | 5 | |
| 3 Sept. |  Overcast | 17° /9° | 16.7 mm | 4 | |
| 4 Sept. | Fog | 19° /11° | 9.1 mm | 4 | |
| 5 Sept. | Fog | 19° /12° | 1.2 mm | 5 | |
| 6 Sept. | Overcast | 18° /12° | 4 mm | 4 | |
| 7 Sept. | Mist | 20° /12° | 6.3 mm | 5 | |
| 8 Sept. |  Light rain shower | 19° /11° | 5.2 mm | 4 | |
| 9 Sept. | Fog | 16° /9° | 1.8 mm | 4 | |
| 10 Sept. | Light rain shower | 21° /11° | 11 mm | 3 | |
| 11 Sept. | Sunny | 20° /10° | 0 mm | 5 | |
| 12 Sept. | Sunny | 19° /8° | 0 mm | 5.5 | |
| 13 Sept. | Overcast | 18° /11° | 0 mm | 2.6 | |
| 14 Sept. | Sunny | 20° /10° | 3.1 mm | 3.9 | |
| 15 Sept. | Sunny | 17° /6° | 0 mm | 5 | |
| 16 Sept. | Overcast | 18° /8° | 0.1 mm | 5 | |
| 17 Sept. | Fog | 21° /14° | 13.4 mm | 5 | |
| 18 Sept. |  Moderate or heavy rain shower | 16° /10° | 69.5 mm | 3 | |
| 19 Sept. | Sunny | 15° /7° | 0 mm | 4 | |
| 20 Sept. | Sunny | 16° /9° | 0 mm | 5 | |
| 21 Sept. | Sunny | 19° /8° | 0 mm | 5 | |
| 22 Sept. | Overcast | 15° /9° | 0 mm | 3 | |
| 23 Sept. | Light rain shower | 17° /11° | 79.4 mm | 4 | |
| 24 Sept. | Sunny | 18° /11° | 2.5 mm | 5 | |
| 25 Sept. | Patchy rain possible | 16° /10° | 8.8 mm | 4 | |
| 26 Sept. | Sunny | 17° /9° | 34.7 mm | 4 | |
| 27 Sept. | Sunny | 18° /9° | 24.7 mm | 5 | |
| 28 Sept. | Mist | 17° /7° | 0 mm | 4 | |
| 29 Sept. | Fog | 18° /10° | 0 mm | 5 | |
| 30 Sept. | Mist | 18° /9° | 0 mm | 4 | |
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Saint John County in September - FAQ
What are the expected maximum and minimum temperatures in Saint John County during September?
How much rainfall should be expected in Saint John County during September?
What are the typical wind conditions in Saint John County during September?
September rainfall patterns in Saint John County
UV exposure in Saint John County during September
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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.