September weather forecast
Gerrit, ID

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Weather in September

The first month of the autumn, September, is still a pleasant month in Gerrit, Idaho, with temperature in the range of an average low of 44.1°F (6.7°C) and an average high of 69.4°F (20.8°C).

Temperature

September's arrival coincides with a drop in the average high-temperature, decreasing from August's warm 79.5°F (26.4°C) to an agreeable 69.4°F (20.8°C). In September, the temperature sees a substantial plunge from daytime highs to a low average of 44.1°F (6.7°C).

Humidity

In September, the average relative humidity is 48%.

Rainfall

In Gerrit, in September, during 9.1 rainfall days, 1.26" (32mm) of precipitation is typically accumulated. In Gerrit, during the entire year, the rain falls for 121 days and collects up to 20.12" (511mm) of precipitation.

Snowfall

January through June, September through December are months with snowfall in Gerrit. September is the first month it typically snows. Throughout September, in the average 0.5 snowfall days, it receives 0.67" (17mm) of snow. In Gerrit, during the entire year, snow falls for 119.7 days and aggregates up to 88.23" (2241mm) of snow.

Daylight

The average length of the day in September in Gerrit is 12h and 30min.
On the first day of the month, sunrise is at 6:49 am and sunset at 8:00 pm. On the last day of September, sunrise is at 7:22 am and sunset at 7:06 pm MDT.

Sunshine

The average sunshine in September is 10h.

UV index

The average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: A maximum UV index of 3 in September translates into the following recommendations:
Act with care - The need to guard against sun damage is communicated. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
Updated: Jul 11, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the temperature in September?

The high-temperature during September is 69.4°F (20.8°C) and the low-temperature is 44.1°F (6.7°C).

What is the average humidity in September?

The average relative humidity in September is 48%.

How many days does it rain in September?

In Gerrit, during September, the rain falls for 9.1 days and regularly aggregates up to 1.26" (32mm) of precipitation.

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 0.67" (17mm) of snow.

What is the average length of the day in September?

In Gerrit, the average day length in September is 12h and 30min.

When is the sunrise / sunset in September in Gerrit?

On the first day of September, sunrise is at 6:49 am and sunset at 8:00 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 7:06 pm MDT.

How many hours of sunshine does Gerrit have in September?

In Gerrit, the average sunshine duration in September is 10h.

What is the UV index intensity in September?

In September, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a moderate health threat from exposure to Sun's UV rays.
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
Gerrit, ID

Average temperature in September - Gerrit, ID
  • Average high temperature in September: 69.4°F

The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is December (25°F).

  • Average low temperature in September: 44.1°F

The month with the highest average low temperature is July (50°F).
The coldest month (with the lowest average low temperature) is January (10.8°F).

Average pressure in September
Gerrit, ID

Average pressure in September - Gerrit, ID
  • Average pressure in September: 29.99"Hg

The month with the highest atmospheric pressure is January (30.27"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in September
Gerrit, ID

Average wind speed in September - Gerrit, ID
  • Average wind speed in September: 6mph

The windiest month (with the highest average wind speed) is June (6.6mph).
The calmest month (with the lowest average wind speed) is January (4.4mph).

Average humidity in September
Gerrit, ID

Average humidity in September - Gerrit, ID
  • Average humidity in September: 48%

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
Gerrit, ID

Average rainfall in September - Gerrit, ID
  • Average rainfall in September: 1.26"

The wettest month (with the highest rainfall) is January (2.44").
The driest month (with the least rainfall) is July (0.59").

Average rainfall days in September
Gerrit, ID

Average rainfall days in September - Gerrit, 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 (4.5 days).

Average snowfall in September
Gerrit, ID

Average snowfall in September - Gerrit, ID
  • Average snowfall in September: 0.67"

The month with the highest snowfall is January (20").
The months with the least snowfall are July and August (0").

Average snowfall days in September
Gerrit, ID

Average snowfall days in September - Gerrit, 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
Gerrit, ID

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

The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).

  • Average sunshine in September: 10h and 0min

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 12min).

Average sunshine days in September
Gerrit, ID

Average sunshine days in September - Gerrit, ID
  • Average sunshine days in September: 18 days

The month with the most sunshine days is July (19.9 days).
The month with the least sunshine days is April (6.7 days).

Average UV index in September
Gerrit, ID

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

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).

Average cloud cover in September
Gerrit, ID

Average cloud cover in September - Gerrit, ID
  • Average cloud cover in September: 17

The month with the most cloud cover is February (Cloud cover 61).
The months with the least cloud cover are July and August (Cloud cover 12).

Average visibility in September
Gerrit, ID

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

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

Gerrit, Idaho, USA

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