September weather forecast
Winthrop, IN

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Weather in September

The first month of the autumn, September, is still a warm month in Winthrop, Indiana, with temperature in the range of an average low of 57.6°F (14.2°C) and an average high of 75.7°F (24.3°C).

Temperature

Transitioning into September, Winthrop records an average high-temperature of a still warm 75.7°F (24.3°C), almost identical to August's 80.2°F (26.8°C). Throughout September, Winthrop experiences a low-temperature average of 57.6°F (14.2°C).

Humidity

In September, the average relative humidity is 78%.

Rainfall

The month with the least rainfall is September, when the rain falls for 12.6 days and typically collects 1.5" (38mm) of precipitation.

Snowfall

May through October are months without snowfall.

Daylight

The average length of the day in September is 12h and 27min.
On the first day of the month, sunrise is at 7:17 am and sunset at 8:20 pm. On the last day of September, sunrise is at 7:45 am and sunset at 7:32 pm EDT.

Sunshine

The average sunshine in September is 8.4h.

UV index

The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: The UV index of 5 during September leads to these advisories:
Put precautions into practice - Guidance to elude sunburn is provided. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.
Updated: Aug 21, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for Winthrop in September?

September temperatures vary between a high-temperature of 75.7°F (24.3°C) and a low-temperature of 57.6°F (14.2°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, in July is calculated to be 87.8°F (31°C).

What is the average humidity in September?

In Winthrop, the average relative humidity in September is 78%.

What is the driest month?

September is the month with the least rainfall. Rain falls for 12.6 days and accumulates 1.5" (38mm) of precipitation.

How much does it rain in September?

In Winthrop, in September, it is raining for 12.6 days, with typically 1.5" (38mm) of accumulated precipitation.

When it does not snow?

May through October are months without snowfall.

How many hours of daylight does Winthrop have in September?

In September, the average day length in Winthrop is 12h and 27min.

When is the sunrise / sunset in September?

In September, on the first day of the month, sunrise is at 7:17 am and sunset at 8:20 pm. On the last day of the month, in Winthrop, sunrise is at 7:45 am and sunset at 7:32 pm EDT.

How long on average sun shines in September?

The average sunshine duration in September is 8.4h.

How high is the UV index in September in Winthrop?

In Winthrop, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium health risk from exposure to the Sun's UV radiation.
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 September
Winthrop, IN

Average temperature in September - Winthrop, IN
  • Average high temperature in September: 75.7°F

The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (32°F).

  • Average low temperature in September: 57.6°F

The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (20.1°F).

Average pressure in September
Winthrop, IN

Average pressure in September - Winthrop, IN
  • Average pressure in September: 30.03"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in September
Winthrop, IN

Average wind speed in September - Winthrop, IN
  • Average wind speed in September: 7mph

The windiest month (with the highest average wind speed) is January (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (6.2mph).

Average humidity in September
Winthrop, IN

Average humidity in September - Winthrop, IN
  • Average humidity in September: 78%

The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (73%).

Average rainfall in September
Winthrop, IN

Average rainfall in September - Winthrop, IN
  • Average rainfall in September: 1.5"

The wettest month (with the highest rainfall) is April (3.39").
The driest month (with the least rainfall) is September (1.5").

Average rainfall days in September
Winthrop, IN

Average rainfall days in September - Winthrop, IN
  • Average rainfall days in September: 12.6 days

The month with the highest number of rainy days is May (19.4 days).
The month with the least rainy days is February (7.3 days).

Average snowfall in September
Winthrop, IN

Average snowfall in September - Winthrop, IN
  • Average snowfall in September: 0"

The month with the highest snowfall is February (3.27").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Winthrop, IN

Average snowfall days in September - Winthrop, IN
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (11 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Winthrop, IN

Average daylight in September / Average sunshine in September - Winthrop, IN
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in September: 8h and 2min

The month with the most sunshine is June (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).

Average sunshine days in September
Winthrop, IN

Average sunshine days in September - Winthrop, IN
  • Average sunshine days in September: 14.6 days

The month with the most sunshine days is November (17.8 days).
The month with the least sunshine days is July (9 days).

Average UV index in September
Winthrop, IN

Average UV index in September - Winthrop, IN
  • Average UV index in September: 5

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

Average cloud cover in September
Winthrop, IN

Average cloud cover in September - Winthrop, IN
  • Average cloud cover in September: 33

The month with the most cloud cover is January (Cloud cover 59).
The months with the least cloud cover are June and August (Cloud cover 32).

Average visibility in September
Winthrop, IN

Average visibility in September - Winthrop, IN
  • Average visibility in September: 6mi

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).

Winthrop, Indiana, USA

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