Last updated: June 24, 2025
In September, the average temperature in Prospect, United States hovers around 19°C (66°F), creating a comfortable atmosphere for exploration. However, temperatures can fluctuate significantly, with minimums dropping to 3°C (38°F) and maximums soaring up to 33°C (91°F). Be prepared for some rain, as the area typically sees about 119 mm (4.7 in) of precipitation over 10 days, while the average humidity remains relatively high at 77%.
In September in Prospect, the average temperature is 19°C (66°F). Maximum temperatures can reach 33°C (91°F), while minimums can drop as low as 3°C (38°F). This climate makes Prospect an ideal destination for travelers seeking a mix of warm and cool experiences.
In Prospect in September, the total precipitation amount is 119 mm (4.7 in) over the span of 10 days.
In Prospect in September, humidity is 77%. With an average temperature of 19°C (66°F), this humidity feels like a heavy blanket wrapping around you, making the air feel thick and sticky, which can be quite uncomfortable for traveling.
In Prospect in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Prospect.
UV Risk Categories
Weather in Prospect varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Prospect, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -2°C (29°F) | 102 mm (4.0 inches) | 88% | moderate |
| February Weather | 0°C (33°F) | 117 mm (4.6 inches) | 88% | moderate |
| March Weather | 4°C (39°F) | 106 mm (4.2 inches) | 87% | high |
| April Weather | 10°C (49°F) | 141 mm (5.6 inches) | 87% | very high |
| May Weather | 16°C (61°F) | 150 mm (5.9 inches) | 81% | very high |
| June Weather | 20°C (69°F) | 139 mm (5.5 inches) | 83% | very high |
| July Weather | 23°C (74°F) | 145 mm (5.7 inches) | 82% | very high |
| August Weather | 22°C (71°F) | 101 mm (4.0 inches) | 76% | very high |
| September Weather | 19°C (66°F) | 119 mm (4.7 inches) | 77% | very high |
| October Weather | 13°C (56°F) | 129 mm (5.1 inches) | 82% | high |
| November Weather | 5°C (41°F) | 104 mm (4.1 inches) | 89% | moderate |
| December Weather | 1°C (35°F) | 104 mm (4.1 inches) | 86% | low |