St. John's Weather: September
 |
Average Day Temperature: | 61.4°F |
|
Average Night Temperature: | 55.2°F |
|
Sea Water Temperature: | 57.8°F |
|
Number of Sunny Days: | 7 days |
| Sunshine Hours: | 11.7 - 13.4 hours | |
|
Number of Rainy Days: | 3 days |
| Precipitation Totals: | 1.5 in | |
| detailed information | ||
forecast
| St. John's |
Temperature
| St. John's |
Air Temperature in September, °F
The highest day temperature in September 2025 was 77°F. The lowest night temperature was 43°F. The average values for day and night temperatures during September were 61.0°F и 52.1°F respectivly.
St. John's Water Sea Temperature in September, °F
The average sea surface temperature in September 2025 for St. John's was 56.7°F. The maximum and minimum values were 54.4°F and 59.4°F respectively.
Most of the days in September are gloomy but you can also expect sunny days.
Precipitation Totals in September, in
Precipitation total in September for St. John's is 1.5 in. It makes september one of the least rainy months of the year.
The average wind speed in September is 12.0 mph.
We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for St. John's in September is 5.7 hours.
St. John's on the Weather Map
| Halifax |  |
+12 |
| Kingston |  |
+4 |
| Moncton | |
-6 |
| Montreal | |
-2 |
| Niagara Falls | |
+10 |
| Ottawa | |
-4 |
| Prince Edward Island |  |
+6 |
| Quebec | |
-12 |
| Rocky Harbour |  |
+28 |
| St. John's | |
+32 |
| Sydney | |
+24 |
| Toronto | |
+10 |
| Vancouver | |
+42 |
| Victoria | |
+44 |
| Winnipeg | |
+12 |
| 0300 |  |
32°F | N 14 mph |
| 0600 |  |
36°F | NW 17 mph |
| 0900 |  |
34°F | NW 16 mph |
| 1200 |  |
24°F | E 34 mph |
| 1500 | |
18°F | E 31 mph |
| 1800 | |
18°F | E 34 mph |
| 2100 | |
20°F | E 40 mph |
| 0000 | |
20°F | E 40 mph |