September weather forecast
Troy, ID

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Troy, Idaho, with temperature in the range of an average high of 73.4°F (23°C) and an average low of 51.4°F (10.8°C).

Temperature

The onset of September brings a small change in high-temperatures, falling from 83.7°F (28.7°C) in August to a still warm 73.4°F (23°C). Despite drastic daily temperature oscillations, Troy cools down to an average low-temperature of 51.4°F (10.8°C) in September.

Humidity

In September, the average relative humidity in Troy is 48%.

Rainfall

In September, the rain falls for 8.1 days. Throughout September, 0.63" (16mm) of precipitation is accumulated. Throughout the year, in Troy, there are 143.2 rainfall days, and 20.51" (521mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, September through December. September is the first month it typically snows in Troy. Throughout September, in the average 0.2 snowfall days, it receives 0.28" (7mm) of snow. In Troy, Idaho, during the entire year, snow falls for 60.2 days and aggregates up to 47.24" (1200mm) of snow.

Daylight

In Troy, Idaho, the average length of the day in September is 12h and 32min.
On the first day of the month, sunrise is at 6:07 am and sunset at 7:25 pm. On the last day of September, sunrise is at 6:45 am and sunset at 6:28 pm PDT.

Sunshine

In Troy, the average sunshine in September is 10.3h.

UV index

In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for average individuals.
Note: A maximum UV index of 4 in September translates into the following recommendations:
Heed the precautions - It is counselled to guard against solar damage. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.
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Frequently asked questions

What is the usual temperature for Troy in September?

The average high-temperature, in September, in Troy, is 73.4°F (23°C), while the average low-temperature is 51.4°F (10.8°C). In August, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which combines relative humidity and air temperature, is appraised at 82.4°F (28°C).

What is the average humidity in September in Troy?

The average relative humidity in September is 48%.

How much does it rain in Troy in September?

In Troy, Idaho, in September, during 8.1 rainfall days, 0.63" (16mm) of precipitation is typically accumulated.

When does it start to snow in Troy?

September is the first month it typically snows in Troy, Idaho. Throughout September, in the average 0.2 snowfall days, it receives 0.28" (7mm) of snow.

How many hours of daylight does Troy have in September?

In Troy, Idaho, the average day length in September is 12h and 32min.

When is the sunrise / sunset in September in Troy?

In September, on the first day of the month, sunrise is at 6:07 am and sunset at 7:25 pm. On the last day of the month, in Troy, Idaho, sunrise is at 6:45 am and sunset at 6:28 pm PDT.

How many hours of sunshine does Troy have in September?

In Troy, Idaho, the average sunshine duration in September is 10.3h.

What is the UV index intensity in September in Troy?

In Troy, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health threat from unprotected exposure to 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
Troy, ID

Average temperature in September - Troy, ID
  • Average high temperature in September: 73.4°F

The warmest month (with the highest average high temperature) is August (83.7°F).
The month with the lowest average high temperature is December (34°F).

  • Average low temperature in September: 51.4°F

The month with the highest average low temperature is August (58.1°F).
The coldest month (with the lowest average low temperature) is December (24.1°F).

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Average pressure in September
Troy, ID

Average pressure in September - Troy, ID
  • Average pressure in September: 29.96"Hg

The month with the highest atmospheric pressure is January (30.2"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).

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Average wind speed in September
Troy, ID

Average wind speed in September - Troy, ID
  • Average wind speed in September: 4.8mph

The windiest month (with the highest average wind speed) is April (6.3mph).
The calmest months (with the lowest average wind speed) are July, August and September (4.8mph).

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Average humidity in September
Troy, ID

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

The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is August (40%).

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Average rainfall in September
Troy, ID

Average rainfall in September - Troy, ID
  • Average rainfall in September: 0.63"

The wettest month (with the highest rainfall) is December (2.68").
The driest months (with the least rainfall) are July and August (0.47").

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Average rainfall days in September
Troy, ID

Average rainfall days in September - Troy, ID
  • Average rainfall days in September: 8.1 days

The month with the highest number of rainy days is April (18.1 days).
The months with the least rainy days are July and August (5.9 days).

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Average snowfall in September
Troy, ID

Average snowfall in September - Troy, ID
  • Average snowfall in September: 0.28"

The month with the highest snowfall is January (12.56").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in September
Troy, ID

Average snowfall days in September - Troy, ID
  • Average snowfall days in September: 0.2 days

The month with the highest number of snowfall days is December (14.1 days).
The months with the least snowfall days are June, July and August (0 days).

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

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

The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).

  • Average sunshine in September: 10h and 2min

The month with the most sunshine is August (Average sunshine: 12h and 0min).
The months with the least sunshine are January, February and December (Average sunshine: 4h and 30min).

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Average sunshine days in September
Troy, ID

Average sunshine days in September - Troy, ID
  • Average sunshine days in September: 20.1 days

The month with the most sunshine days is July (23.3 days).
The month with the least sunshine days is February (9.2 days).

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Average UV index in September
Troy, ID

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

The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is February (UV index 1).

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Average cloud cover in September
Troy, ID

Average cloud cover in September - Troy, ID
  • Average cloud cover in September: 19

The month with the most cloud cover is February (Cloud cover 54).
The months with the least cloud cover are July and August (Cloud cover 12).

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Average visibility in September
Troy, ID

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

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

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Troy, Idaho, USA

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