July weather forecast
Custer, MT

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Weather in July

July in Custer, Montana, is a tropical summer month, with an average temperature ranging between max 86.5°F (30.3°C) and min 64.2°F (17.9°C).

Temperature

In Custer, the peak temperatures are generally noted in July, averaging a high of 86.5°F (30.3°C) and a low of 64.2°F (17.9°C).

Heat index

July's mean heat index is estimated at a tropical 86°F (30°C). Prolonged exposure combined with continuous activity could lead to exhaustion, and possibly heat cramps.
Realize that the values for the heat index are set for shaded places and light winds. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', provides an understanding of perceived warmth by combining temperature and relative humidity. One's perception of weather can be shaped by other factors, involving metabolic differences, pregnancy, and physical exertion. Do note, being directly under sun rays can amplify the heat you feel, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Children often fail to understand the importance of rest and rehydration. Thirst is a late manifestation of dehydration - hence, it is crucial to stay hydrated, especially during ongoing physical activities.

Humidity

The average relative humidity in July in Custer is 40%.

Rainfall

In July, the rain falls for 10.3 days. Throughout July, 0.87" (22mm) of precipitation is accumulated. Throughout the year, in Custer, there are 107 rainfall days, and 12.17" (309mm) of precipitation is accumulated.

Snowfall

In Custer, snow does not fall in June through August.

Daylight

In Custer, the average length of the day in July is 15h and 20min.
On the first day of July in Custer, Montana, sunrise is at 5:23 am and sunset at 9:05 pm. On the last day of the month, sunrise is at 5:52 am and sunset at 8:41 pm MDT.

Sunshine

July has the most sunshine of the year, with an average of 11.8h of sunshine.

UV index

With an average maximum UV index of 7, July is the month with the highest UV index. A UV Index value of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: In July, a regular UV index of 7 translates into these guidelines:
Follow precautions and abide by sun safety rules. Deterrence of sunburn is imperative. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
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Frequently asked questions

What is the hottest time of year in Custer?

The month of July sees the average highest temperatures in Custer, reaching 86.5°F (30.3°C) at the peak and 64.2°F (17.9°C) at the low.

Is it hot in Custer during July?

In Custer, 86.5°F (30.3°C) is the average high-temperature and 64.2°F (17.9°C) is the average low-temperature during July. In July, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which represents the influence of relative humidity on air temperature, is estimated at 86°F (30°C).

What is the average humidity in July in Custer?

The average relative humidity in July in Custer is 40%.

How much does it rain in Custer in July?

In July, in Custer, Montana, the rain falls for 10.3 days. Throughout July, 0.87" (22mm) of precipitation is accumulated.

When it does not snow in Custer?

In Custer, Montana, snow does not fall in June through August.

How many hours of daylight does Custer have in July?

In July, the average day length in Custer, Montana, is 15h and 20min.

What time are sunrise and sunset in July in Custer?

On the first day of July in Custer, Montana, sunrise is at 5:23 am and sunset at 9:05 pm. On the last day of the month, sunrise is at 5:52 am and sunset at 8:41 pm MDT.

What month has the most sunshine in Custer?

With an average of 11.8h of sunshine, July has the most sunshine of the year in Custer.

How long on average sun shines in July in Custer?

The average sunshine duration in July in Custer, Montana, is 11.8h.

What is the month with the highest UV index in Custer?

With an average maximum UV index of 7, July is the month with the highest UV index.

What is the UV index reading in July in Custer?

The average daily maximum UV index in July is 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in July
Custer, MT

Average temperature in July - Custer, MT
  • Average high temperature in July: 86.5°F

The warmest month (with the highest average high temperature) is July (86.5°F).
The months with the lowest average high temperature are January and December (31.1°F).

  • Average low temperature in July: 64.2°F

The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (17.6°F).

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Average pressure in July
Custer, MT

Average pressure in July - Custer, MT
  • Average pressure in July: 29.89"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).

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Average wind speed in July
Custer, MT

Average wind speed in July - Custer, MT
  • Average wind speed in July: 8.2mph

The windiest month (with the highest average wind speed) is April (10.2mph).
The calmest months (with the lowest average wind speed) are July and August (8.2mph).

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Average humidity in July
Custer, MT

Average humidity in July - Custer, MT
  • Average humidity in July: 40%

The month with the highest relative humidity is January (79%).
The month with the lowest relative humidity is August (38%).

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Average rainfall in July
Custer, MT

Average rainfall in July - Custer, MT
  • Average rainfall in July: 0.87"

The wettest month (with the highest rainfall) is May (1.85").
The driest month (with the least rainfall) is December (0.55").

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Average rainfall days in July
Custer, MT

Average rainfall days in July - Custer, MT
  • Average rainfall days in July: 10.3 days

The month with the highest number of rainy days is May (14.3 days).
The month with the least rainy days is December (4.5 days).

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Average snowfall in July
Custer, MT

Average snowfall in July - Custer, MT
  • Average snowfall in July: 0"

The month with the highest snowfall is February (4.29").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in July
Custer, MT

Average snowfall days in July - Custer, MT
  • Average snowfall days in July: 0 days

The month with the highest number of snowfall days is February (10.6 days).
The months with the least snowfall days are June, July and August (0 days).

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Average daylight in July /
Average sunshine in July
Custer, MT

Average daylight in July / Average sunshine in July - Custer, MT
  • Average daylight in July: 15h and 2min

The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).

  • Average sunshine in July: 11h and 5min

The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 12min).

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Average sunshine days in July
Custer, MT

Average sunshine days in July - Custer, MT
  • Average sunshine days in July: 16.3 days

The month with the most sunshine days is November (19.2 days).
The month with the least sunshine days is April (13.5 days).

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Average UV index in July
Custer, MT

Average UV index in July - Custer, MT
  • Average UV index in July: 7

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average cloud cover in July
Custer, MT

Average cloud cover in July - Custer, MT
  • Average cloud cover in July: 15

The month with the most cloud cover is February (Cloud cover 46).
The months with the least cloud cover are July and August (Cloud cover 15).

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Average visibility in July
Custer, MT

Average visibility in July - Custer, MT
  • Average visibility in July: 6mi

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

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Custer, Montana, USA

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