Johnstone Weather in September
What's the weather like in Johnstone (Scotland) in September 2025?
The climate in Johnstone during September can be summarized as mild and wet.
September is in the fall / autumn in Johnstone and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 15°C (59°F), whilst at night 9°C (48°F) is normal.
| Daytime temperature | 15°C 59°F |
|---|---|
| Nightly temperature | 8.8°C 47.8°F |
| Average temperature | 11.9°C 53.4°F |
| Daily sunshine | 4 hrs |
| Avg rainfall | 153 mm 6 ins |
| Rainy days | 20 days |
| Sea temperature | 14.5°C 58.1°F |
| Humidity | 86% |
| Windspeed | 16.6kph 10 mph |
On average September is the wettest month of the year in Johnstone with around 153mm 6 inches of rain making it a wet time to visit. This rainfall is typically spread over 20 days, although this may vary considerably.
On the flip side this corresponds to an average of 4 hours of sunshine per day.
September temperatures in Johnstone
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Johnstone in September 2025.
Other monthly averages
Best places to visit in September
Johnstone weather stats
| Hottest month: | July | 17.7°C 63.9°F |
|---|---|---|
| Driest month: | April | 67mm 2.6ins |
| Sunniest month: | May | 6.4hrs |
| Coldest month: | January | 5.6°C 42.1°F |
| Wettest month: | September | 153mm 6ins |
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