Saint John Weather Forecast (Oct 4-10): Sunny Weekend Gives Way to Mid-Week Soaker

by Johnny | Oct 4, 2025 | City, Weather | 0 comments

Get ready for a week of two distinct weather patterns in Saint John. You can expect a beautiful, sunny weekend perfect for outdoor activities, followed by a significant shift to heavy rain and cooler temperatures mid-week. Here’s what you need to know for your plans from October 4th to October 10th.

A Pleasant and Sunny Start

The week kicks off with plenty of sunshine. According to the latest forecast from Saint John Daily, Saturday will be clear and warm with a high of 23°C and an overnight low of 10°C. Sunday brings a few more clouds, but conditions remain pleasant with a high of 18°C and a low of 9°C. The start of the workweek continues this trend, with clear skies and a high of 21°C on Monday.

Mid-Week Soaker Arrives

Prepare for a dramatic change starting Wednesday. The forecast calls for heavy, intense rain, with a 100% chance of precipitation. Expect significant rainfall totaling nearly 43 mm. Temperatures will drop to a high of 14°C and a low of 10°C. The rain continues into Thursday, though it will be lighter, with temperatures falling further to a brisk high of 11°C and a low of just 4°C.

Image of heavy rain icon. Source: weatherin.org

Clearing Skies for Friday

By Friday, the rain system moves out, and clear skies return. However, the cooler air remains. Expect a sunny but cool day with a high of 13°C and an overnight low dropping to just 2°C, so you will want to keep your jackets handy as you head into the next weekend.

Frequently Asked Questions

What day will be the rainiest this week in Saint John?

Wednesday, October 8th, is forecast to be the rainiest day, with heavy intensity rain and a predicted accumulation of nearly 43 mm.

What are the expected temperatures for the weekend of October 4-5?

The forecast for Saturday, October 4th, is a high of 23°C and a low of 10°C. Sunday, October 5th, will be slightly cooler with a high of 18°C and a low of 9°C.