Last updated: June 24, 2025
In Walnut Grove, United States, the average temperature for September hovers around 18°C (65°F). Expect minimums dropping to 2°C (36°F) and maximums reaching a warm 33°C (91°F). With an average precipitation of 107 mm (4.2 in) spread over 9 days, it’s advisable to keep an umbrella handy. Plus, the average humidity level is a notable 82%, adding a touch of mugginess to the air. Enjoy the unique climate of this vibrant location!
In September in Walnut Grove, the average temperature is 18°C (65°F), with maximums reaching 33°C (91°F) and minimums dropping as low as 2°C (36°F). This makes Walnut Grove an ideal destination for travelers seeking a mix of comfortable days and cooler evenings.
In Walnut Grove in September, the precipitation amount is 107 mm (4.2 in), occurring over a span of 9 days.
In Walnut Grove in September, humidity is 82%. With an average temperature of 18°C (65°F), this humidity feels like a warm, sticky embrace that can quickly leave travelers feeling fatigued and in need of frequent breaks to stay refreshed and hydrated.
In Walnut Grove 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 Walnut Grove.
UV Risk Categories
Weather in Walnut Grove varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Walnut Grove, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -8°C (17°F) | 27 mm (1.0 inches) | 85% | moderate |
| February Weather | -9°C (17°F) | 27 mm (1.1 inches) | 89% | moderate |
| March Weather | 1°C (33°F) | 65 mm (2.6 inches) | 81% | moderate |
| April Weather | 6°C (43°F) | 83 mm (3.3 inches) | 82% | very high |
| May Weather | 15°C (59°F) | 122 mm (4.8 inches) | 76% | very high |
| June Weather | 22°C (72°F) | 104 mm (4.1 inches) | 81% | very high |
| July Weather | 23°C (74°F) | 118 mm (4.6 inches) | 82% | very high |
| August Weather | 21°C (71°F) | 128 mm (5.1 inches) | 83% | very high |
| September Weather | 18°C (65°F) | 107 mm (4.2 inches) | 82% | very high |
| October Weather | 9°C (48°F) | 92 mm (3.6 inches) | 82% | moderate |
| November Weather | 1°C (34°F) | 30 mm (1.2 inches) | 87% | moderate |
| December Weather | -4°C (25°F) | 41 mm (1.6 inches) | 84% | low |