The highest day temperature in September 2025 was 84°F. The lowest night temperature was 35°F. The average values for day and night temperatures during September were 67.0°F и 52.9°F respectivly.

Most of the days in September are gloomy but you can also expect sunny days.

Precipitation total in September for Rivera is 3.1 in. It makes september the most rainy month of the year.

The average wind speed in September is 8.0 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Rivera in September is 6.0 hours.