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
Weather in September
Temperature
With the onset of September, a modest change to an agreeable 72.9°F (22.7°C) from August's 77.7°F (25.4°C) is noted in high-temperature. During the nights in September, an average low-temperature of 57°F (13.9°C) is observed in Helena.Humidity
In September, the average relative humidity in Helena is 78%.Rainfall
In September, the rain falls for 14.2 days. Throughout September, 2.09" (53mm) of precipitation is accumulated. In Helena, during the entire year, the rain falls for 163.4 days and collects up to 30.28" (769mm) of precipitation.Snowfall
June through September are months without snowfall in Helena.Daylight
The average length of the day in September in Helena, Ohio, is 12h and 28min.On the first day of September in Helena, Ohio, sunrise is at 7:00 am and sunset at 8:05 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 7:16 pm EDT.
Sunshine
The average sunshine in September in Helena is 8.1h.UV index
In September, the average daily maximum UV index in Helena is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the average person.Note: The maximum UV index, 4 during September, leads to the following recommendations:
Take precautions - Protection against sun damage is advised. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September in Helena?
What is the average humidity in September in Helena?
How much does it rain in Helena in September?
When it does not snow in Helena?
Does it snow in Helena in September?
What is the average length of the day in September in Helena?
When is the sunrise / sunset in September in Helena?
How long on average sun shines in September in Helena?
What is the UV index intensity in September in Helena?
Average temperature in September
Helena, OH
- Average high temperature in September: 72.9°F
The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (30.7°F).
- Average low temperature in September: 57°F
The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (19.9°F).
Average pressure in September
Helena, OH
- Average pressure in September: 30.04"Hg
The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Helena, OH
- Average wind speed in September: 7.3mph
The windiest month (with the highest average wind speed) is January (10.9mph).
The calmest month (with the lowest average wind speed) is July (6.3mph).
Average humidity in September
Helena, OH
- Average humidity in September: 78%
The months with the highest relative humidity are January and February (84%).
The month with the lowest relative humidity is October (74%).
Average rainfall in September
Helena, OH
- Average rainfall in September: 2.09"
The wettest months (with the highest rainfall) are May and June (3.5").
The driest month (with the least rainfall) is February (1.65").
Average rainfall days in September
Helena, OH
- Average rainfall days in September: 14.2 days
The month with the highest number of rainy days is May (18.7 days).
The month with the least rainy days is February (7.2 days).
Average snowfall in September
Helena, OH
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.13").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Helena, OH
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Helena, OH
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 8h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in September
Helena, OH
- Average sunshine days in September: 13.4 days
The month with the most sunshine days is November (15.5 days).
The month with the least sunshine days is February (10.3 days).
Average UV index in September
Helena, OH
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Helena, OH
- Average cloud cover in September: 34
The month with the most cloud cover is January (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in September
Helena, OH
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Helena, Ohio, USA
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