Last updated: June 24, 2025
In Fremont, United States, the average temperature in September is 20°C (69°F). Expect a comfortable range, with minimums dipping to 6°C (42°F) and maximums soaring to 33°C (92°F). Be prepared for some rain as well, with a precipitation total of 126 mm (4.9 in) expected over 8 days. Additionally, the average humidity sits at a moderate 73%, creating a humid atmosphere throughout the month.
In September in Fremont, the average temperature is 20°C (69°F), with maximums reaching up to 33°C (92°F) and minimums dropping as low as 6°C (42°F). This variation in temperature makes it important for travelers to prepare for both warm days and cooler evenings.
In Fremont in September, the total precipitation amount is 126 mm (4.9 in), occurring over the course of 8 days.
In Fremont in September humidity is 73%. With an average temperature of 20°C (69°F), this humidity feels like a warm embrace, making travel slightly sticky but ultimately comfortable as long as you stay hydrated and take breaks in the shade.
In Fremont 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 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 | -5°C (24°F) | 48 mm (1.9 inches) | 78% | moderate |
| February Weather | -4°C (26°F) | 51 mm (2.0 inches) | 80% | moderate |
| March Weather | 5°C (41°F) | 88 mm (3.5 inches) | 77% | high |
| April Weather | 10°C (50°F) | 76 mm (3.0 inches) | 77% | very high |
| May Weather | 17°C (63°F) | 159 mm (6.2 inches) | 77% | very high |
| June Weather | 24°C (75°F) | 134 mm (5.3 inches) | 81% | extreme |
| July Weather | 25°C (77°F) | 72 mm (2.8 inches) | 81% | very high |
| August Weather | 23°C (74°F) | 67 mm (2.6 inches) | 77% | very high |
| September Weather | 20°C (69°F) | 126 mm (4.9 inches) | 73% | very high |
| October Weather | 12°C (54°F) | 128 mm (5.0 inches) | 75% | high |
| November Weather | 4°C (39°F) | 52 mm (2.0 inches) | 85% | moderate |
| December Weather | 0°C (32°F) | 41 mm (1.6 inches) | 83% | moderate |