Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
September
Weather in September
Temperature
September's arrival registers an average high-temperature of a still refreshing 15.1°C (59.2°F), closely aligning with the temperature of the previous month. September brings Johnstown a consistent average low-temperature of 8.5°C (47.3°F).Humidity
The average relative humidity in September is 90%.Rainfall
In September, in Johnstown, Ireland, the rain falls for 10.1 days. Throughout September, 16mm (0.63") of precipitation is accumulated. Throughout the year, in Johnstown, Ireland, there are 142.7 rainfall days, and 221mm (8.7") of precipitation is accumulated.Snowfall
May through October are months without snowfall in Johnstown.Daylight
In September, the average length of the day in Johnstown is 12h and 40min.On the first day of the month, sunrise is at 6:37 am and sunset at 8:15 pm. On the last day of September, sunrise is at 7:27 am and sunset at 7:05 pm IST.
Sunshine
In Johnstown, the average sunshine in September is 5.6h.UV index
In September, the average daily maximum UV index is 3. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: In September, an average UV index of 3 transforms into the following instructions:
Prioritize safety - Suggestions to prevent sun damage are offered. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Johnstown in September?
What is the average humidity in September in Johnstown?
How much does it rain in Johnstown in September?
When it does not snow in Johnstown?
How many hours of daylight does Johnstown have in September?
When are sunrise and sunset in September in Johnstown?
How many hours of sunshine does Johnstown have in September?
How high is the UV index in September in Johnstown?
Average temperature in September
Johnstown, Ireland
- Average high temperature in September: 15.1°C
The warmest month (with the highest average high temperature) is July (17.4°C).
The month with the lowest average high temperature is January (6.6°C).
- Average low temperature in September: 8.5°C
The month with the highest average low temperature is July (10.7°C).
The coldest month (with the lowest average low temperature) is February (1.8°C).
Average pressure in September
Johnstown, Ireland
- Average pressure in September: 1015.4mbar
The month with the highest atmospheric pressure is May (1016mbar).
The month with the lowest atmospheric pressure is November (1008.3mbar).
Average wind speed in September
Johnstown, Ireland
- Average wind speed in September: 14.2km/h
The windiest month (with the highest average wind speed) is January (19.7km/h).
The calmest month (with the lowest average wind speed) is July (12.9km/h).
Average humidity in September
Johnstown, Ireland
- Average humidity in September: 90%
The month with the highest relative humidity is December (92%).
The months with the lowest relative humidity are April and May (86%).
Average rainfall in September
Johnstown, Ireland
- Average rainfall in September: 16mm
The wettest month (with the highest rainfall) is August (26mm).
The driest months (with the least rainfall) are January and October (13mm).
Average rainfall days in September
Johnstown, Ireland
- Average rainfall days in September: 10.1 days
The month with the highest number of rainy days is July (16.3 days).
The month with the least rainy days is October (9.8 days).
Average snowfall in September
Johnstown, Ireland
- Average snowfall in September: 0mm
The months with the highest snowfall are January and February (15mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Johnstown, Ireland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.7 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Johnstown, Ireland
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 54min).
The month with the shortest days is December (Average daylight: 7h and 36min).
- Average sunshine in September: 5h and 4min
The month with the most sunshine is April (Average sunshine: 6h and 12min).
The month with the least sunshine is February (Average sunshine: 3h and 36min).
Average sunshine days in September
Johnstown, Ireland
- Average sunshine days in September: 14.8 days
The month with the most sunshine days is December (15.8 days).
The month with the least sunshine days is July (7.8 days).
Average UV index in September
Johnstown, Ireland
- Average UV index in September: 3
The months with the highest UV index are May, June and August (UV index 4).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Johnstown, Ireland
- Average cloud cover in September: 63
The month with the most cloud cover is July (Cloud cover 69).
The month with the least cloud cover is April (Cloud cover 58).
Average visibility in September
Johnstown, Ireland
- Average visibility in September: 8km
The months with the highest visibility are January, February, March and December (9km).
The month with the lowest visibility is July (7km).
