The best times to visit Saint John for ideal weather are
June 18th to September 9th
based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.
Saint John Travel Guide
Other Saint John Travel Info
Weather in Saint John
Average temperatures in Saint John vary drastically. Considering humidity, temperatures feel cold for about half of the year and otherwise nice with a chance of rain or snow throughout most of the year. The area is less temperate than some — in the 17th percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Saint John, the hottest months are July, August, and then June. See average monthly temperatures below. The warmest time of year is generally mid July where highs are regularly around 76.8°F (24.9°C) with temperatures rarely dropping below 53.2°F (11.8°C) at night.
Saint John Temperatures (Fahrenheit)
Saint John Temperatures (Celsius)
The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.
Saint John Perceived Temperature (F)
Saint John Perceived Temperature (C)
Average Saint John Temperatures by Month
Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.
|Month||Avg. High (°F)||Avg. Mean (°F)||Avg. Low (°F)|
|Month||Avg. High (°C)||Avg. Mean (°C)||Avg. Low (°C)|
Precipitation (Rain or Snow)
If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Saint John are August, September, and then March. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around mid to late September. For example, on the week of September 17th there is 1 day of precipitation on average. By contrast, it’s most likely to rain or snow in late December with an average of 3 days of significant precipitation the week of December 24th.
When can you find snow in Saint John? Weather stations report very large amounts of snow likely to be deepest around March, especially close to late March. The best time to ski (if at all) in Saint John is often around around March 26th when fresh powder is deepest. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.
Chance of Precipitation
The graph below shows the % chance of rainy and snowy days in Saint John.
Snow on the Ground
The graph below shows the average snow on the ground in Saint John (in).
Average Rain and Snow by Month
|Month||Daily Chance of Rain||Average Snow Depth (in)||Total Precipitation (in)|
|Month||Daily Chance of Rain||Average Snow Depth (cm)||Total Precipitation (cm)|
Humidity and Wind
Saint John has some very humid months, with other comfortably humid months. The least humid month is March (54.7% relative humidity), and the most humid month is August (74%).
Wind in Saint John is usually moderate. The windiest month is March, followed by December and April. March’s average wind speed of around 10.1 knots (11.6 MPH or 18.7 KPH) is considered “a gentle breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in early to mid February where average top sustained speeds reach 19.3 knots, which is considered a fresh breeze.
Relative Humidity (%)
The graph below shows the average % humidity by month in Saint John.
The graph below shows wind speed (max and average) in knots.
Average Wind Speeds
Show Wind Speeds
All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.
|Month||Avg. Wind||Avg. Wind Feel||Sustained High Wind||High Wind Feel|
|Jan||9.2||Gentle breeze||17.7||Strong breeze|
|Feb||9.4||Gentle breeze||18.1||Strong breeze|
|Mar||10.1||Gentle breeze||18.5||Strong breeze|
|Apr||9.4||Gentle breeze||17.4||Strong breeze|
|May||8.4||Gentle breeze||16.2||Strong breeze|
|Jun||7.7||Gentle breeze||14.9||Significant breeze|
|Jul||6.6||Light breeze||13.7||Strong breeze|
|Aug||6.5||Light breeze||13.5||Significant breeze|
|Sep||7.3||Gentle breeze||14.7||Strong breeze|
|Oct||8.2||Gentle breeze||15.7||Significant breeze|
|Nov||8.7||Gentle breeze||16.6||Strong breeze|
|Dec||9.7||Gentle breeze||17.8||Strong breeze|
Show Relative Humidity by Month
|Month||Avg. Relative Humidity|
Is it Safe to Travel to Saint John?
Our best data indicates this area is generally safe. As of Oct 07, 2019 there are no travel advisories or warnings for Canada; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Oct 07, 2019.
The Busiest and Least Crowded Months
The busiest month for tourism in Saint John, NB, Canada is July, followed by August and June. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Saint John in December. Those willing to visit at these times will likely find it the least expensive month.
Estimated Tourism by Month
Most Popular Months to Visit
Overall Saint John Travel Experience by Season
Spring (March through May)
Humidity and temperatures combine to make this season feel moderately cold. Highs range from 66°F (18.9°C) and 32.2°F (0.1°C) with far warmer temperatures in the later months. Rain is somewhat common with 7 to 8 days of significant precipitation per month. Spring is the second busiest for tourism, which makes it a good time for those looking for things to do.
Summer (June through August)
The middle-year months have comfortably cool weather with high temperatures that are comfortable. These months see moderate precipitation with 6 to 8 days of precipitation per month. June – August is the busiest season for tourism in Saint John, so lodging and other accommodations may cost more than usual.
Fall (September through November)
Fall daily highs range from 72°F (22.2°C) and 42.2°F (5.7°C), which will feel chilly given the humidity and wind. It rains or snows a significant amount: 6 to 9 days per month. Tourism is fairly slow during these months due to the weather, so hotels may be lower priced.
Winter (December through February)
Weather is far too cold this time of year in Saint John to be enjoyable for warm weather travelers. The average high during this season is between 41°F (5°C) and 25.3°F (-3.7°C). On average, it rains or snows a fair amount: 8 to 12 times per month. These times of year are the slowest with tourists.