Last updated: June 24, 2025
In September, the average temperature in Missouri Valley, United States is a pleasant 21°C (69°F). However, temperatures can vary significantly, with a minimum of 4°C (40°F) and a maximum reaching up to 36°C (97°F). Expect around 81 mm (3.2 in) of precipitation over 9 days, contributing to an average humidity level of 75%.
In September in Missouri Valley, the average temperature is 21°C (69°F). Maximum temperatures can reach 36°C (97°F), while the minimum can drop as low as 4°C (40°F). This diverse range of temperatures makes Missouri Valley an ideal destination for travelers seeking both warm days and cooler evenings.
In Missouri Valley in September, the precipitation amount is 81 mm (3.2 in) spread over a duration of 9 days.
In Missouri Valley in September, humidity is 75%. With an average temperature of 21°C (69°F), this humidity feels like a warm, sticky embrace that can make even a short walk feel exhausting for travelers, often leading to a longing for refreshing breezes or air-conditioned retreats.
In Missouri 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 Missouri Valley.
UV Risk Categories
Weather in Missouri Valley varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Missouri Valley, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -4°C (25°F) | 31 mm (1.2 inches) | 76% | moderate |
| February Weather | -4°C (25°F) | 32 mm (1.3 inches) | 80% | moderate |
| March Weather | 5°C (41°F) | 90 mm (3.5 inches) | 73% | high |
| April Weather | 10°C (50°F) | 60 mm (2.4 inches) | 74% | very high |
| May Weather | 17°C (63°F) | 154 mm (6.1 inches) | 78% | very high |
| June Weather | 24°C (76°F) | 126 mm (5.0 inches) | 82% | very high |
| July Weather | 25°C (78°F) | 66 mm (2.6 inches) | 83% | very high |
| August Weather | 23°C (74°F) | 106 mm (4.2 inches) | 80% | very high |
| September Weather | 21°C (69°F) | 81 mm (3.2 inches) | 75% | very high |
| October Weather | 11°C (53°F) | 111 mm (4.4 inches) | 75% | high |
| November Weather | 4°C (40°F) | 31 mm (1.2 inches) | 82% | moderate |
| December Weather | -1°C (31°F) | 39 mm (1.5 inches) | 83% | low |