September weather forecastHaswell, CO
September
Weather in September
The first month of the autumn, September, is still a warm month in Haswell, Colorado, with an average temperature ranging between min 61.9°F (16.6°C) and max 83.5°F (28.6°C).Temperature
The arrival of September signals a subtle shift in temperature, down from a tropical 90.1°F (32.3°C) in August to a warm 83.5°F (28.6°C). Haswell documents a striking divergence from daytime highs, with an average nighttime temperature of 61.9°F (16.6°C) in September.Heat index
September's mean heat index is computed to be 82.4°F (28°C). Exhaustion becomes probable with enduring exposure and activity, potentially causing heat cramps.The metrics for the heat index are tailored for both shady environments and light winds. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is found by incorporating humidity levels into the air temperature measurement. The effect of weather is individual, with a variety of people experiencing it differently due to distinctions in body mass, height, and level of activity. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Young children typically face greater hazards than adults because they do not sweat as much. Their larger skin surface in comparison to their little bodies and the high heat production from their active nature compounds their vulnerability.
Humidity
In Haswell, the average relative humidity in September is 43%.Rainfall
In September, the rain falls for 7.8 days. Throughout September, 0.71" (18mm) of precipitation is accumulated. Throughout the year, in Haswell, there are 89.9 rainfall days, and 10.2" (259mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
The average length of the day in September is 12h and 25min.On the first day of September, sunrise is at 6:22 am and sunset at 7:22 pm. On the last day of the month, sunrise is at 6:48 am and sunset at 6:36 pm MDT.
Sunshine
The average sunshine in September in Haswell is 10.6h.UV index
The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for the ordinary person.Note: In September, the maximum UV index of 5 transforms into these recommendations:
Act with care - The suggestion to avoid sunburn is emphasized. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Haswell, CO
- Average high temperature in September: 83.5°F
The warmest month (with the highest average high temperature) is July (92.8°F).
The month with the lowest average high temperature is December (43.7°F).
- Average low temperature in September: 61.9°F
The month with the highest average low temperature is July (70.9°F).
The coldest month (with the lowest average low temperature) is December (26.6°F).
Average pressure in September
Haswell, CO
- Average pressure in September: 29.94"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.82"Hg).
Average wind speed in September
Haswell, CO
- Average wind speed in September: 10.3mph
The windiest month (with the highest average wind speed) is April (11.7mph).
The calmest month (with the lowest average wind speed) is January (8.2mph).
Average humidity in September
Haswell, CO
- Average humidity in September: 43%
The month with the highest relative humidity is January (58%).
The month with the lowest relative humidity is June (38%).
Average rainfall in September
Haswell, CO
- Average rainfall in September: 0.71"
The wettest month (with the highest rainfall) is July (1.81").
The driest months (with the least rainfall) are January, November and December (0.35").
Average rainfall days in September
Haswell, CO
- Average rainfall days in September: 7.8 days
The month with the highest number of rainy days is July (13.8 days).
The month with the least rainy days is January (3.3 days).
Average snowfall in September
Haswell, CO
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.17").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Haswell, CO
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (5.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Haswell, CO
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 10h and 36min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 6h and 42min).
Average sunshine days in September
Haswell, CO
- Average sunshine days in September: 19.9 days
The month with the most sunshine days is November (24.5 days).
The month with the least sunshine days is July (13.2 days).
Average UV index in September
Haswell, CO
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January, November and December (UV index 2).
Average cloud cover in September
Haswell, CO
- Average cloud cover in September: 14
The months with the most cloud cover are February and April (Cloud cover 25).
The months with the least cloud cover are June and September (Cloud cover 14).
Average visibility in September
Haswell, CO
- Average visibility in September: 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).
