September weather forecast
Roberts, ID

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Weather in September

The first month of the autumn, September, is also an agreeable month in Roberts, Idaho, with an average temperature ranging between max 72.9°F (22.7°C) and min 47.8°F (8.8°C).

Temperature

The commencement of September indicates a shift in the average high-temperature, receding from August's warm 83.3°F (28.5°C) to a pleasant 72.9°F (22.7°C). Roberts, in September, displays a significant temperature downturn during the night, with an average reading of 47.8°F (8.8°C).

Humidity

In September, the average relative humidity is 42%.

Rainfall

In Roberts, in September, it is raining for 7.8 days, with typically 0.83" (21mm) of accumulated precipitation. Throughout the year, there are 112.3 rainfall days, and 10.94" (278mm) of precipitation is accumulated.

Snowfall

January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.24" (6mm) of snow. In Roberts, during the entire year, snow falls for 79 days and aggregates up to 31.54" (801mm) of snow.

Daylight

In Roberts, Idaho, the average length of the day in September is 12h and 29min.
On the first day of the month, sunrise is at 6:53 am and sunset at 8:03 pm. On the last day of September, sunrise is at 7:25 am and sunset at 7:10 pm MDT.

Sunshine

The average sunshine in September is 10h.

UV index

In Roberts, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily high UV index of 4 in September translates into this advice:
Ensure safety - Recommendations to avert sunburn are presented. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.

Frequently asked questions

What are the temperatures in September?

In September, in Roberts, the average high-temperature is 72.9°F (22.7°C), and the average low-temperature is 47.8°F (8.8°C).

What is the average humidity in September?

In September, the average relative humidity is 42%.

How many days does it rain in September?

In Roberts, in September, it is raining for 7.8 days, with typically 0.83" (21mm) of accumulated precipitation.

When does it start to snow?

September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.24" (6mm) of snow.

What is the average length of the day in September?

In Roberts, the average day length in September is 12h and 29min.

When is the sunrise / sunset in September?

On the first day of September, sunrise is at 6:53 am and sunset at 8:03 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 7:10 pm MDT.

How long on average sun shines in September?

The average sunshine duration in September in Roberts is 10h.

What is the UV index reading in September in Roberts?

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unsafe 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
Roberts, ID

Average temperature in September - Roberts, ID
  • Average high temperature in September: 72.9°F

The warmest month (with the highest average high temperature) is July (85.1°F).
The month with the lowest average high temperature is December (27.1°F).

  • Average low temperature in September: 47.8°F

The month with the highest average low temperature is August (53.8°F).
The coldest month (with the lowest average low temperature) is January (13.8°F).

Average pressure in September
Roberts, ID

Average pressure in September - Roberts, ID
  • Average pressure in September: 29.98"Hg

The month with the highest atmospheric pressure is January (30.29"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed in September
Roberts, ID

Average wind speed in September - Roberts, ID
  • Average wind speed in September: 6.8mph

The windiest month (with the highest average wind speed) is April (8mph).
The calmest month (with the lowest average wind speed) is January (4.9mph).

Average humidity in September
Roberts, ID

Average humidity in September - Roberts, ID
  • Average humidity in September: 42%

The month with the highest relative humidity is January (90%).
The month with the lowest relative humidity is August (37%).

Average rainfall in September
Roberts, ID

Average rainfall in September - Roberts, ID
  • Average rainfall in September: 0.83"

The wettest month (with the highest rainfall) is May (1.26").
The driest month (with the least rainfall) is July (0.31").

Average rainfall days in September
Roberts, ID

Average rainfall days in September - Roberts, ID
  • Average rainfall days in September: 7.8 days

The month with the highest number of rainy days is April (14.2 days).
The month with the least rainy days is July (5.8 days).

Average snowfall in September
Roberts, ID

Average snowfall in September - Roberts, ID
  • Average snowfall in September: 0.24"

The month with the highest snowfall is January (8.31").
The months with the least snowfall are June, July and August (0").

Average snowfall days in September
Roberts, ID

Average snowfall days in September - Roberts, ID
  • Average snowfall days in September: 0.1 days

The month with the highest number of snowfall days is January (17.3 days).
The months with the least snowfall days are July and August (0 days).

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

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

The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).

  • Average sunshine in September: 10h and 0min

The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).

Average sunshine days in September
Roberts, ID

Average sunshine days in September - Roberts, ID
  • Average sunshine days in September: 19.8 days

The month with the most sunshine days is July (22.3 days).
The month with the least sunshine days is February (9.9 days).

Average UV index in September
Roberts, ID

Average UV index in September - Roberts, ID
  • Average UV index in September: 4

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

Average cloud cover in September
Roberts, ID

Average cloud cover in September - Roberts, ID
  • Average cloud cover in September: 16

The month with the most cloud cover is February (Cloud cover 52).
The months with the least cloud cover are July and August (Cloud cover 11).

Average visibility in September
Roberts, ID

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

The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (4mi).

Roberts, Idaho, USA

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