July weather forecast
Rochester, IL

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Weather in July

July, the same as June, is a moderately hot summer month in Rochester, Illinois, with an average temperature ranging between min 66°F (18.9°C) and max 82.8°F (28.2°C).

Temperature

Rochester's temperature records reveal July as the warmest month, marked by average highs of 82.8°F (28.2°C) and lows of 66°F (18.9°C).

Heat index

The heat index value for July is appraised at a tropical 91.4°F (33°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Consider that heat index readings are for situations in the shade and light wind. With exposure to direct sunshine, the heat index could climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is a measure of how hot it feels when the actual air humidity is factored in. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. One must note that being under the direct sun can escalate the heat's effects, with the heat index possibly rising by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Kids frequently fail to realize the necessity for resting and hydrating. Thirst is an advanced indication of dehydration - hence, maintaining hydration, especially during extended physical activities, becomes essential.

Humidity

The most humid month in Rochester is July, with an average relative humidity of 84%.

Rainfall

In Rochester, during July, the rain falls for 15.8 days and regularly aggregates up to 2.17" (55mm) of precipitation. Throughout the year, in Rochester, there are 141.7 rainfall days, and 22.72" (577mm) of precipitation is accumulated.

Snowfall

May through October are months without snowfall.

Daylight

The average length of the day in July in Rochester is 14h and 40min.
On the first day of the month, sunrise is at 5:34 am and sunset at 8:30 pm. On the last day of July, sunrise is at 5:56 am and sunset at 8:12 pm CDT.

Sunshine

The average sunshine in July is 10.1h.

UV index

The months with the highest UV index are June through August, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: An average maximum UV index of 6 in July leads to these recommendations:
Eschew overexposure. Those with light skin may suffer burns in fewer than 20 minutes. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. To cut down UV radiation exposure by about half, sport a wide-brim hat.
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Frequently asked questions

What is the hottest time of year in Rochester?

Rochester's temperatures peak on average in July, reaching 82.8°F (28.2°C) at their highest and 66°F (18.9°C) at their lowest.

How hot is July in Rochester?

Rochester in July has an average high-temperature of 82.8°F (28.2°C) and an average low-temperature of 66°F (18.9°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which combines air temperature and relative humidity, in July is appraised at 91.4°F (33°C).

What is the most humid month in Rochester?

The most humid month in Rochester, Illinois, is July, with an average relative humidity of 84%.

What is the average humidity in July in Rochester?

In July, the average relative humidity is 84%.

How many days does it rain in July in Rochester?

In July, the rain falls for 15.8 days. Throughout July, 2.17" (55mm) of precipitation is accumulated.

When it does not snow in Rochester?

In Rochester, snow does not fall in May through October.

How many hours of daylight does Rochester have in July?

In Rochester, Illinois, the average day length in July is 14h and 40min.

What time are sunrise and sunset in July in Rochester?

On the first day of July in Rochester, sunrise is at 5:34 am and sunset at 8:30 pm. On the last day of the month, sunrise is at 5:56 am and sunset at 8:12 pm CDT.

How long on average sun shines in July in Rochester?

The average sunshine duration in July in Rochester is 10.1h.

When is the highest UV index in Rochester?

June through August, with an average maximum UV index of 6, are months with the highest UV index.

What is the UV index reading in July in Rochester?

The average daily maximum UV index in July is 6. A UV Index reading of 6 to 7 represents a high hazard to health 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
Rochester, IL

Average temperature in July - Rochester, IL
  • Average high temperature in July: 82.8°F

The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (33.4°F).

  • Average low temperature in July: 66°F

The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (21.4°F).

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Average pressure in July
Rochester, IL

Average pressure in July - Rochester, IL
  • Average pressure in July: 29.97"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in July
Rochester, IL

Average wind speed in July - Rochester, IL
  • Average wind speed in July: 6.2mph

The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.2mph).

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Average humidity in July
Rochester, IL

Average humidity in July - Rochester, IL
  • Average humidity in July: 84%

The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (70%).

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Average rainfall in July
Rochester, IL

Average rainfall in July - Rochester, IL
  • Average rainfall in July: 2.17"

The wettest month (with the highest rainfall) is April (2.64").
The driest month (with the least rainfall) is December (1.14").

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Average rainfall days in July
Rochester, IL

Average rainfall days in July - Rochester, IL
  • Average rainfall days in July: 15.8 days

The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is February (6.2 days).

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Average snowfall in July
Rochester, IL

Average snowfall in July - Rochester, IL
  • Average snowfall in July: 0"

The month with the highest snowfall is February (1.85").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in July
Rochester, IL

Average snowfall days in July - Rochester, IL
  • Average snowfall days in July: 0 days

The month with the highest number of snowfall days is January (8.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in July /
Average sunshine in July
Rochester, IL

Average daylight in July / Average sunshine in July - Rochester, IL
  • Average daylight in July: 14h and 4min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in July: 10h and 1min

The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).

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Average sunshine days in July
Rochester, IL

Average sunshine days in July - Rochester, IL
  • Average sunshine days in July: 11 days

The month with the most sunshine days is October (18.7 days).
The month with the least sunshine days is July (11 days).

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Average UV index in July
Rochester, IL

Average UV index in July - Rochester, IL
  • Average UV index in July: 6

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in July
Rochester, IL

Average cloud cover in July - Rochester, IL
  • Average cloud cover in July: 31

The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is June (Cloud cover 29).

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Average visibility in July
Rochester, IL

Average visibility in July - Rochester, IL
  • Average visibility in July: 5mi

The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).

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Rochester, Illinois, USA

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