September weather forecast
Geneva, ID

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Weather in September

The first month of the autumn, September, is still a pleasant month in Geneva, Idaho, with an average temperature fluctuating between 42.3°F (5.7°C) and 68°F (20°C).

Temperature

September's onset brings a slight change in high-temperatures, falling from a warm 77.7°F (25.4°C) in August to an agreeable 68°F (20°C). A sharp reduction from the daytime highs is witnessed during September, with nighttime temperatures averaging a low of 42.3°F (5.7°C).

Humidity

The average relative humidity in September is 49%.

Rainfall

In September, in Geneva, the rain falls for 9.1 days. Throughout September, 1.14" (29mm) of precipitation is accumulated. In Geneva, during the entire year, the rain falls for 117.5 days and collects up to 20.24" (514mm) of precipitation.

Snowfall

January through June, September through December are months with snowfall. September is the first month it typically snows in Geneva. Throughout September, in the average 0.5 snowfall days, it receives 0.35" (9mm) of snow. Throughout the year, there are 116.1 snowfall days, and 91.14" (2315mm) of snow is accumulated.

Daylight

In September, the average length of the day is 12h and 28min.
On the first day of the month, sunrise is at 6:50 am and sunset at 7:57 pm. On the last day of September, sunrise is at 7:21 am and sunset at 7:06 pm MDT.

Sunshine

The average sunshine in September is 10.1h.

UV index

In Geneva, Idaho, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for average individuals.
Note: The average daily UV index of 3 in September transforms into the following instructions:
Guard yourself - Precautionary measures against sun damage are advocated. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.

Frequently asked questions

What is the temperature in September?

During September, Geneva experiences an average high-temperature of 68°F (20°C) and a low-temperature of 42.3°F (5.7°C).

What is the average humidity in September?

In September, the average relative humidity is 49%.

How much does it rain in September?

In Geneva, in September, during 9.1 rainfall days, 1.14" (29mm) of precipitation is typically accumulated.

When does it start to snow?

September is the first month it typically snows. Throughout September, in the average 0.5 snowfall days, it receives 0.35" (9mm) of snow.

How many hours of daylight does Geneva have in September?

In September, the average day length is 12h and 28min.

What time are sunrise and sunset in September?

On the first day of September, sunrise is at 6:50 am and sunset at 7:57 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 7:06 pm MDT.

How long on average sun shines in September?

In September, the average sunshine duration is 10.1h.

What is the UV index reading in September?

In September, the average daily maximum UV index is 3. A UV Index reading of 3 to 5 represents a medium health risk from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Geneva, ID

Average temperature in September - Geneva, ID
  • Average high temperature in September: 68°F

The warmest month (with the highest average high temperature) is July (79°F).
The month with the lowest average high temperature is December (25.2°F).

  • Average low temperature in September: 42.3°F

The month with the highest average low temperature is July (48.9°F).
The coldest month (with the lowest average low temperature) is January (7.9°F).

Average pressure in September
Geneva, ID

Average pressure in September - Geneva, ID
  • Average pressure in September: 29.97"Hg

The month with the highest atmospheric pressure is January (30.29"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

Average wind speed in September
Geneva, ID

Average wind speed in September - Geneva, ID
  • Average wind speed in September: 5.4mph

The windiest month (with the highest average wind speed) is June (5.8mph).
The calmest months (with the lowest average wind speed) are January and December (4.2mph).

Average humidity in September
Geneva, ID

Average humidity in September - Geneva, ID
  • Average humidity in September: 49%

The months with the highest relative humidity are January and February (92%).
The month with the lowest relative humidity is August (42%).

Average rainfall in September
Geneva, ID

Average rainfall in September - Geneva, ID
  • Average rainfall in September: 1.14"

The wettest month (with the highest rainfall) is May (2.6").
The driest month (with the least rainfall) is July (0.63").

Average rainfall days in September
Geneva, ID

Average rainfall days in September - Geneva, ID
  • Average rainfall days in September: 9.1 days

The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is January (6 days).

Average snowfall in September
Geneva, ID

Average snowfall in September - Geneva, ID
  • Average snowfall in September: 0.35"

The month with the highest snowfall is February (18.39").
The months with the least snowfall are July and August (0").

Average snowfall days in September
Geneva, ID

Average snowfall days in September - Geneva, ID
  • Average snowfall days in September: 0.5 days

The month with the highest number of snowfall days is December (21.6 days).
The months with the least snowfall days are July and August (0 days).

Average daylight in September /
Average sunshine in September
Geneva, ID

Average daylight in September / Average sunshine in September - Geneva, ID
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).

  • Average sunshine in September: 10h and 1min

The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).

Average sunshine days in September
Geneva, ID

Average sunshine days in September - Geneva, ID
  • Average sunshine days in September: 18.3 days

The month with the most sunshine days is July (18.8 days).
The month with the least sunshine days is February (6.8 days).

Average UV index in September
Geneva, ID

Average UV index in September - Geneva, ID
  • Average UV index in September: 3

The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, November and December (UV index 1).

Average cloud cover in September
Geneva, ID

Average cloud cover in September - Geneva, ID
  • Average cloud cover in September: 15

The month with the most cloud cover is February (Cloud cover 62).
The months with the least cloud cover are July and August (Cloud cover 12).

Average visibility in September
Geneva, ID

Average visibility in September - Geneva, ID
  • Average visibility in September: 6mi

The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January and February (3mi).

Geneva, Idaho, USA

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