Last updated: June 24, 2025
In Shell Valley, United States, the average temperature in September hovers around 13°C (56°F), providing a pleasant atmosphere for various activities. However, be prepared for a temperature range that can dip to a chilly -2°C (28°F) at its lowest and peak at a warm 30°C (87°F). During this month, expect about 73 mm (2.9 in) of precipitation spread over 9 days, contributing to an average humidity level of 73%.
In September in Shell Valley, the average temperature is 13°C (56°F), with maximums reaching up to 30°C (87°F) and minimums dropping as low as -2°C (28°F). Travelers should be prepared for a wide range of temperatures, making layering and versatile clothing essential.
In Shell Valley in September, the precipitation amount is 73 mm (2.9 in), occurring over the course of 9 days.
In Shell Valley in September humidity is 73%. With an average temperature of 13°C (56°F), this humidity feels like a cool, damp embrace that can be quite refreshing yet may require a light jacket for comfort while exploring the outdoors.
In Shell Valley in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Shell Valley.
UV Risk Categories
Weather in Shell Valley varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Shell Valley, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -13°C (8°F) | 14 mm (0.6 inches) | 92% | low |
| February Weather | -15°C (5°F) | 16 mm (0.6 inches) | 90% | moderate |
| March Weather | -5°C (24°F) | 24 mm (1.0 inches) | 88% | moderate |
| April Weather | 2°C (36°F) | 23 mm (0.9 inches) | 81% | very high |
| May Weather | 11°C (53°F) | 40 mm (1.6 inches) | 74% | very high |
| June Weather | 18°C (65°F) | 81 mm (3.2 inches) | 72% | very high |
| July Weather | 20°C (69°F) | 63 mm (2.5 inches) | 74% | very high |
| August Weather | 18°C (65°F) | 70 mm (2.8 inches) | 76% | very high |
| September Weather | 13°C (56°F) | 73 mm (2.9 inches) | 73% | high |
| October Weather | 4°C (40°F) | 47 mm (1.9 inches) | 76% | moderate |
| November Weather | -4°C (24°F) | 26 mm (1.0 inches) | 86% | low |
| December Weather | -10°C (15°F) | 22 mm (0.9 inches) | 91% | low |