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 Thursday, while the low is 7 °C on Friday. There are expected to be 3 sunny days and precipitation on 1 day this week.

There are currently no weather alerts.

Monday, September 8

- High of 20 °C, low of 12 °C (43% humidity)
- Overcast with a 0% chance of snow
- High risk of harm from sun exposure (5 UV index)
- Light breeze (15 km/h wind)
- Sunrise at 6:54 AM, sunset at 7:49 PM
1 / 6
afoto6267 // Shutterstock

Tuesday, September 9

- High of 21 °C, low of 9 °C (38% humidity)
- Sunny with a 0% chance of snow
- High risk of harm from sun exposure (6 UV index)
- Light air (9 km/h wind)
- Sunrise at 6:55 AM, sunset at 7:47 PM
2 / 6
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Wednesday, September 10

- High of 21 °C, low of 10 °C (53% humidity)
- Overcast with a 0% chance of snow
- High risk of harm from sun exposure (5 UV index)
- Light air (9 km/h wind)
- Sunrise at 6:57 AM, sunset at 7:45 PM
3 / 6
Saijai Boonmak // Shutterstock

Thursday, September 11

- High of 25 °C, low of 13 °C (45% humidity)
- Partly sunny with a 0% chance of snow
- Moderate risk of harm from sun exposure (5 UV index)
- Light breeze (14 km/h wind)
- Sunrise at 6:58 AM, sunset at 7:43 PM
4 / 6
Marian Weyo // Shutterstock

Friday, September 12

- High of 19 °C, low of 7 °C (46% humidity)
- Sunny with a 0% chance of snow
- Light breeze (15 km/h wind)
- Sunrise at 6:59 AM, sunset at 7:41 PM
5 / 6
Leonid Ikan // Shutterstock

Saturday, September 13

- High of 18 °C, low of 8 °C (54% humidity)
- Overcast with a 0% chance of snow
- Light air (10 km/h wind)
- Sunrise at 7:00 AM, sunset at 7:39 PM
6 / 6
Leonid Ikan // Shutterstock

Sunday, September 14

- High of 20 °C, low of 9 °C (59% humidity)
- Fair with a 0% chance of snow
- Light air (11 km/h wind)
- Sunrise at 7:01 AM, sunset at 7:37 PM
- Last quarter moon

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