Saint John 7-day weather forecast

Written by:
September 8, 2025
ESOlex // Shutterstock

Saint John 7-day weather forecast

Stacker created the forecast for Saint John, New Brunswick using data from OpenWeather. This week's high is 25 °C on Monday, while the low is 3 °C on Sunday. There are expected to be 5 sunny days and precipitation on 0 days this week.

There are currently no weather alerts.

Monday, September 15

- High of 25 °C, low of 9 °C (46% humidity)
- Sunny with a 0% chance of snow
- High risk of harm from sun exposure (5 UV index)
- Light air (10 km/h wind)
- Sunrise at 7:03 AM, sunset at 7:35 PM
1 / 6
Onishchenko Natalya // Shutterstock

Tuesday, September 16

- High of 23 °C, low of 11 °C (42% humidity)
- Sunny with a 0% chance of snow
- Moderate risk of harm from sun exposure (5 UV index)
- Light air (11 km/h wind)
- Sunrise at 7:04 AM, sunset at 7:34 PM
2 / 6
LeManna // Shutterstock

Wednesday, September 17

- High of 21 °C, low of 11 °C (50% humidity)
- Sunny with a 0% chance of snow
- High risk of harm from sun exposure (5 UV index)
- Light breeze (17 km/h wind)
- Sunrise at 7:05 AM, sunset at 7:32 PM
3 / 6
Leonid Ikan // Shutterstock

Thursday, September 18

- High of 19 °C, low of 12 °C (74% humidity)
- Overcast with a 0% chance of snow
- Moderate risk of harm from sun exposure (5 UV index)
- Light breeze (21 km/h wind)
- Sunrise at 7:06 AM, sunset at 7:30 PM
4 / 6
Leonid Ikan // Shutterstock

Friday, September 19

- High of 20 °C, low of 12 °C (46% humidity)
- Mostly cloudy with a 0% chance of snow
- Light breeze (21 km/h wind)
- Sunrise at 7:07 AM, sunset at 7:28 PM
5 / 6
Nazarova Mariia // Shutterstock

Saturday, September 20

- High of 15 °C, low of 7 °C (38% humidity)
- Sunny with a 0% chance of snow
- Light breeze (24 km/h wind)
- Sunrise at 7:09 AM, sunset at 7:26 PM
6 / 6
liseykina // Shutterstock

Sunday, September 21

- High of 16 °C, low of 3 °C (31% humidity)
- Sunny with a 0% chance of snow
- Light breeze (20 km/h wind)
- Sunrise at 7:10 AM, sunset at 7:24 PM
- New moon

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