Last updated: June 24, 2025
In Fremont, United States, the average temperature in September hovers around 18°C (64°F). While you can expect a pleasant warmth, temperatures can range from a chilly 2°C (35°F) to a sweltering 34°C (94°F). Be prepared for some rain, as precipitation averages 111 mm (4.4 in) over 10 days, and the average humidity is a notable 79%. Whether you're bundling up or enjoying the sun, there's a little something for everyone!
In September in Fremont, the average temperature is 18°C (64°F). Maximum temperatures can reach as high as 34°C (94°F), while minimums can drop to as low as 2°C (35°F). This diverse temperature range makes Fremont an ideal destination for travelers seeking both warm and cool experiences.
In Fremont in September, the precipitation amount is 111 mm (4.4 in) over a span of 10 days.
In Fremont in September, humidity is 79%. With an average temperature of 18°C (64°F), this humidity feels like a warm, sticky embrace that can make outdoor activities more challenging but also creates a lush, vibrant atmosphere that's perfect for exploring local culture and scenery.
In Fremont 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 Fremont.
UV Risk Categories
Weather in Fremont varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Fremont, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -4°C (25°F) | 60 mm (2.4 inches) | 87% | low |
| February Weather | -3°C (26°F) | 62 mm (2.5 inches) | 87% | moderate |
| March Weather | 2°C (36°F) | 62 mm (2.4 inches) | 86% | moderate |
| April Weather | 7°C (45°F) | 101 mm (4.0 inches) | 87% | very high |
| May Weather | 14°C (58°F) | 127 mm (5.0 inches) | 82% | very high |
| June Weather | 20°C (68°F) | 120 mm (4.7 inches) | 81% | very high |
| July Weather | 23°C (74°F) | 68 mm (2.7 inches) | 78% | very high |
| August Weather | 22°C (71°F) | 89 mm (3.5 inches) | 79% | very high |
| September Weather | 18°C (64°F) | 111 mm (4.4 inches) | 79% | high |
| October Weather | 11°C (52°F) | 129 mm (5.1 inches) | 82% | moderate |
| November Weather | 3°C (38°F) | 62 mm (2.4 inches) | 87% | moderate |
| December Weather | -1°C (31°F) | 67 mm (2.6 inches) | 86% | low |