Normal weather on 18 September in St. Helens
The weather on 18 September in St. Helens has an average temperature of about 19°C during the day. The maximum temperature can reach up to 22°C, while the minimum temperature can be 15°C.
On average, 0,8 mm of rain falls in St. Helens on 18 September. The wind speed is 3 Beaufort and mainly comes from Southwest.
18 September Averages for St. Helens
 Average temperature | 19°C |
 Highest daytime temperature | 22°C |
| Lowest daytime temperature | 15°C |
 Total rainfall | 0,8 mm |
| Rainy days | 1 day |
Temperature on 18 September in St. Helens per Year
This graph shows the measured temperature on 18 September in St. Helens per year, measured in degrees Celsius, over the past years.
Precipitation on 18 September in St. Helens per Year
This graph shows the total measured precipitation in millimeters on 18 September in St. Helens per year over the past years.
Average weather in St. Helens per month
Click on a month below to see in detail how the weather typically is in St. Helens and what to expect. Based on the historical weather data of St. Helens, you can view the average temperature, precipitation, wind, and UV index for each day of the month.