Temperatures in September
It's hot in September in Johnstone with an average temperature of 33°C. Temperatures this month range from a low of 30°C to a high of 36°C. At night, you can expect temperatures between 20°C and 25°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Johnstone in September. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of September
The month of September starts in Johnstone with hot temperatures, averaging around 35°C during the day and nights close to 24°C. Plenty of days with a chance of precipitation. Breezy clothes like shorts or a dress, plus a hat and sunglasses, are ideal.
Mid-September
By mid-September, the average daytime temperature drops to around 34°C, with nights close to 23°C. There might be a few showers during this period, but plenty of dry days with sunshine too. Breezy clothes like shorts or a dress, plus a hat and sunglasses, are ideal.
End of September
By the end of September, the average daytime temperature in Johnstone will be around 32°C, with nights close to 22°C. There’s regular precipitation, but with a bit of luck, you’ll also get some dry and sunny days.
Precipitation in September
In September, there is an average of 214 mm of precipitation, spread over 5 days. The wind speed is around 4 Bft, mostly coming from the Southeast.
The precipitation chance averages 17% per day this month. Though that seems low, there are also a few days with a higher chance of precipitation.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in September for Johnstone. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
Johnstone in September |
London | ||
|---|---|---|---|
 Average Temperature |
33°C | 20°C | |
 High Temp |
36°C | 22°C | |
| Low Temp |
30°C | 17°C | |
 Total Precipitation |
214 mm | 44 mm | |
| Rainy Days |
5 days | 8 days | |
August
UV index
The UV index is a maximum of 8 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Is September a good time to visit Johnstone?
After some sun? Then September isn’t the best time to be in Johnstone. The temperature is pleasant, but there’s too much chance of rain this month.
The hurricane season in Johnstone runs from June to November.
Temperature records for Johnstone in September
With 41°C, Johnstone hit the highest temperature in the last 10 years in September 2017. The lowest daytime temperature in this month was 19°C in 2020. The extreme night temperatures ranged from a low of 8°C to a high of 29°C.
Check out the climate of Johnstone for all months and discover the best travel time
Daily Temperature in September in Johnstone
This chart shows the average daily temperatures, both day and night, for each day in September in Johnstone, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in September in Johnstone
The chart below shows the average daily precipitation in September for Johnstone, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for September, you can expect around 5 days of rain in Johnstone.
Daily UV Index in September in Johnstone
This chart shows the average daily UV index in September in Johnstone, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in September in Johnstone Over the Years
This chart shows the average temperature in September in Johnstone, measured in degrees Celsius, over the past years.
Total Precipitation in September in Johnstone Over the Years
This chart shows the average precipitation in September in Johnstone, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in September for Johnstone
Click on a specific day in September for detailed info on the typical weather on that day in Johnstone. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in September in Johnstone
Have you been to Johnstone in September?
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Average Weather in Johnstone by Month
Click on a month below to see detailed weather info for Johnstone. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
Or check out the climate of Johnstone for all months at once
