If you plan to visit St. John's in September, the weather is typically alright, with an average high temperature of +61°F during the day and approximately 2 sunny days. Expect some rainy, though, as there are typically 16 rainy days in the month and around 100 mm of precipitation. The weather is changeable so you may have to pack for every eventuality. Search flightsin one click on Avionero.
Average weather
☀️
+61°F
Avg. max. temperature
+36°F
Min.
+81°F
Max.
100 mm
Total precipitation
83%
Avg. humidity
5 m/s
Avg. wind
2 ☀️
Sunny Days
12 ⛅️
Cloudy
16 🌦
Rainy
Our opinion: St. John's has OK weather in September.
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Average temperature in St. John's in September
Here are the expected maximum, average and minimum temperatures in St. John's for September based on the historical data.
Last Year
Historical Data
Going from a maximum of +79°F during the day to a minimum of +39°F during the night, the temperature in September averages around +66°F.
The average maximum temperature goes up 0% by the end of the month, compared with the beginning of the month, from +61°F to +61°F.
Is St. John's warm or cold in September?
St. John's is typically mild in September.
Maximum temperatures go down compared to the previous month from +66°F to +61°F. The minimum temperature also goes down from +57°F to +52°F.
Pack a light jacket as it will be warm in the day and cool in the evenings.
September is one of the warmest months in St. John's, here is the comparison with other months:
Climate in St. John's in September
St. John's weather looks like this, on average, in September and the surrounding months.
August
September
October
Avg. temperature
+66°F
+61°F
+52°F
Min. temperature
+43°F
+36°F
+30°F
Max. temperature
+86°F
+81°F
+75°F
Rainfall
86 mm
100 mm
122 mm
Wind
4 m/s
5 m/s
5 m/s
Humidity
83%
83%
83%
Air pressure
1014 HPa
1015 HPa
1014 HPa
Sunny days
1
2
1
Cloudy days
14
12
11
Rainy days
16
16
19
Snowy days
0
0
0
September weather is still as ok as in August.It’s getting colder in September. From +66°F in the day, the average maximum temperature lowers to +61°F.Prepare for more rain. Average rainfall goes from 86 mm to 100 mm.Humidity levels don’t change as the month goes on, averaging around 83%.Winds are stronger in comparison to August, going up from 4 m/s to 5 m/s on average.The good news is there are likely to be more sunny days in September, from 1 to 2.
October brings much the same weather, it remains ok.
Wind speed in St. John's in September based on historical data.
Last Year
Historical Data
The average wind speed is 5 m/s getting up to 9 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in St. John's is gradually decreasing during September, going from 4 m/s to 2 m/s over the course of the month.
Rain
Amount of rainfall in mm during September in St. John's based on historical data.
Last Year
Historical Data
Typically, there is a 57% chance of rain on an average day in September, with total rainfall of approximately 96 mm. The maximum amount of rainfall per day is around 18 mm, which is considered light rain.September is a pretty wet month with over 17 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of wellies.
Here’s how September is compared with other months in the amount of precipitation, total mm:
St. John's wettest month is April, where a typical day has a 20% chance of precipitation and 126 mm of rainfall per day. February, on the other hand, is the driest month with a mere 7% chance of precipitation and 37 mm of rainfall per day.
How was the weather last September in St. John's?
This is the weather in St. John's in September 2024:
1 September
☁️
+61°F
2 September
☀️
+68°F
3 September
☁️
+73°F
4 September
☁️
+69°F
5 September
🌫️
+64°F
6 September
🌫️
+77°F
7 September
☁️
+78°F
8 September
🌧️
+68°F
9 September
☁️
+64°F
10 September
🌫️
+77°F
11 September
🌫️
+69°F
12 September
🌫️
+60°F
13 September
🌫️
+63°F
14 September
🌫️
+65°F
15 September
🌧️
+73°F
16 September
🌫️
+73°F
17 September
🌫️
+78°F
18 September
☁️
+69°F
19 September
🌫️
+59°F
20 September
🌫️
+69°F
21 September
☁️
+62°F
22 September
🌧️
+50°F
23 September
☀️
+63°F
24 September
☁️
+59°F
25 September
☁️
+55°F
26 September
☁️
+59°F
27 September
☁️
+53°F
28 September
☁️
+58°F
29 September
☀️
+66°F
30 September
☀️
+61°F
In September 2024 St. John's had 4 sunny days, 12 cloudy days, and 3 rainy days. The average maximum temperature was +66°F, with an absolute maximum of +79°F and a minimum of +50°F. The average humidity was 88%, with a maximum of 100% and a minimum of 55%. The average wind speed was 5 m/s, with a maximum of 13 m/s and a minimum of 0 m/s.
Are you planning a trip in September?
Climate Change Over the Years
This is how St. John's climate has changed over the last 43 years.
The climate in St. John's in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1985 (+44°F) and the highest in 2022 (+52°F). The driest year was 1989 with only 563 mm of rainfall, and the wettest year was 2023 with 7230 mm.
FAQ
Frequently asked questions about the weather in St. John's in September:
Is September a good time to visit St. John's?
It’s always a good time to visit St. John's, but the weather is changeable in September, so plan a mix of indoor and outdoor activities and exploring, and pack for every eventuality.
Can you sunbathe in St. John's in September?
September has mild temperatures in St. John's. Not ideal for sunbathing, but still good for daytime outdoor activities, but plan for cool evenings. Pack a light jacket and shorts!
Is St. John's rainy in September?
St. John's is often rainy in September. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.
Is it sunny in St. John's in September?
Usually, it’s not very sunny in St. John's in September, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.
For this page, we’ve looked at the typical weather in St. John's, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
