Last updated: June 24, 2025
In Green Valley, United States, the average temperature in September hovers around 18°C (64°F). However, temperatures can vary widely, with minimums dipping to -1°C (30°F) and maximums soaring up to 39°C (102°F). You'll also experience average humidity levels of 76%, complemented by 33 mm (1.3 in) of precipitation over 6 days.
In September in Green Valley, the average temperature is 18°C (64°F). The maximum can reach 39°C (102°F) and the minimum can be as low as -1°C (30°F). This diverse range of temperatures makes it essential for travelers to be prepared for both warm and cool conditions.
In Green Valley, in September, the precipitation amount is 33 mm (1.3 in) over the course of 6 days.
In Green Valley in September, humidity is 76%. With an average temperature of 18°C (64°F), this humidity feels like a warm blanket wrapping around you, making outdoor activities feel steamy and invigorating—perfect for exploring charming streets, though you might want to take breaks in the shade.
In Green Valley 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 Green Valley.
UV Risk Categories
Weather in Green Valley varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Green Valley, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (27°F) | 11 mm (0.5 inches) | 73% | moderate |
| February Weather | -5°C (23°F) | 21 mm (0.8 inches) | 78% | moderate |
| March Weather | 2°C (37°F) | 38 mm (1.5 inches) | 64% | high |
| April Weather | 6°C (44°F) | 62 mm (2.4 inches) | 66% | very high |
| May Weather | 13°C (55°F) | 93 mm (3.7 inches) | 74% | very high |
| June Weather | 21°C (69°F) | 56 mm (2.2 inches) | 84% | extreme |
| July Weather | 24°C (75°F) | 69 mm (2.7 inches) | 85% | extreme |
| August Weather | 22°C (72°F) | 34 mm (1.3 inches) | 85% | very high |
| September Weather | 18°C (64°F) | 33 mm (1.3 inches) | 76% | very high |
| October Weather | 8°C (47°F) | 48 mm (1.9 inches) | 71% | moderate |
| November Weather | 3°C (38°F) | 13 mm (0.5 inches) | 73% | moderate |
| December Weather | -1°C (30°F) | 26 mm (1.0 inches) | 75% | low |