September weather forecast
Rochester, NH

Weather in September

September, the first month of the autumn in Rochester, is still a pleasant month, with an average temperature ranging between max 69.6°F (20.9°C) and min 52.9°F (11.6°C).

Temperature

In Rochester, the average high-temperature in September marginally drops from a warm 77.4°F (25.2°C) in August to a pleasant 69.6°F (20.9°C). In Rochester, in September, the average low-temperature is 52.9°F (11.6°C).

Humidity

In Rochester, the average relative humidity in September is 79%.

Rainfall

The month with the least rainfall in Rochester is September, when the rain falls for 11.8 days and typically collects 1.5" (38mm) of precipitation.

Snowfall

June through September are months without snowfall.

Daylight

In September, the average length of the day in Rochester is 12h and 29min.
On the first day of the month, sunrise is at 6:08 am and sunset at 7:19 pm. On the last day of September, in Rochester, sunrise is at 6:40 am and sunset at 6:27 pm EDT.

Sunshine

In Rochester, the average sunshine in September is 8.3h.

UV index

The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: The daily maximum UV index of 4 in September interpret into the following advice:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the average humidity in September in Rochester?

In September, the average relative humidity is 79%.

What is the driest month in Rochester?

September is the month with the least rainfall in Rochester. Rain falls for 11.8 days and accumulates 1.5" (38mm) of precipitation.

How many days does it rain in September in Rochester?

In Rochester, New Hampshire, in September, it is raining for 11.8 days, with typically 1.5" (38mm) of accumulated precipitation.

When it does not snow in Rochester?

In Rochester, snow does not fall in June through September.

Does it snow in Rochester in September?

In Rochester, New Hampshire, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does Rochester have in September?

In September, the average day length in Rochester, New Hampshire, is 12h and 29min.

When is the sunrise / sunset in September in Rochester?

In September, on the first day of the month, sunrise is at 6:08 am and sunset at 7:19 pm. On the last day of the month, in Rochester, New Hampshire, sunrise is at 6:40 am and sunset at 6:27 pm EDT.

How long on average sun shines in September in Rochester?

The average sunshine duration in September in Rochester is 8.3h.

What is the UV index reading in September in Rochester?

In Rochester, New Hampshire, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate health threat from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Rochester, NH

Average temperature in September - Rochester, NH
  • Average high temperature in September: 69.6°F

The warmest month (with the highest average high temperature) is July (78.3°F).
The month with the lowest average high temperature is January (29.7°F).

  • Average low temperature in September: 52.9°F

The month with the highest average low temperature is July (60.3°F).
The coldest month (with the lowest average low temperature) is January (17.4°F).

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Average pressure in September
Rochester, NH

Average pressure in September - Rochester, NH
  • Average pressure in September: 30.05"Hg

The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in September
Rochester, NH

Average wind speed in September - Rochester, NH
  • Average wind speed in September: 6mph

The windiest month (with the highest average wind speed) is January (9.3mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).

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Average humidity in September
Rochester, NH

Average humidity in September - Rochester, NH
  • Average humidity in September: 79%

The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is April (75%).

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Average rainfall in September
Rochester, NH

Average rainfall in September - Rochester, NH
  • Average rainfall in September: 1.5"

The wettest months (with the highest rainfall) are October and December (3.11").
The driest month (with the least rainfall) is September (1.5").

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Average rainfall days in September
Rochester, NH

Average rainfall days in September - Rochester, NH
  • Average rainfall days in September: 11.8 days

The month with the highest number of rainy days is May (15.1 days).
The month with the least rainy days is February (6.8 days).

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Average snowfall in September
Rochester, NH

Average snowfall in September - Rochester, NH
  • Average snowfall in September: 0"

The month with the highest snowfall is December (6.69").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Rochester, NH

Average snowfall days in September - Rochester, NH
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (10.4 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
Rochester, NH

Average daylight in September / Average sunshine in September - Rochester, NH
  • Average daylight in September: 12h and 29min

The month with the longest days is June (Average daylight: 15h and 20min).
The month with the shortest days is December (Average daylight: 9h and 2min).

  • Average sunshine in September: 8h and 18min

The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

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Average sunshine days in September
Rochester, NH

Average sunshine days in September - Rochester, NH
  • Average sunshine days in September: 16.2 days

The month with the most sunshine days is November (16.9 days).
The month with the least sunshine days is April (13.3 days).

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Average UV index in September
Rochester, NH

Average UV index in September - Rochester, NH
  • Average UV index in September: 4

The months with the highest UV index are July and August (UV index 6).
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 September
Rochester, NH

Average cloud cover in September - Rochester, NH
  • Average cloud cover in September: 35

The month with the most cloud cover is March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 32).

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Average visibility in September
Rochester, NH

Average visibility in September - Rochester, NH
  • Average visibility in September: 5mi

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

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