September 2026
Historical dataDaily high, low, and average
Most notable conditions during this period
Load the same period from the previous 15 years.
Key findings from analysis for selected period
Average highs of 24.8°C in Rio de Janeiro. Warm, pleasant conditions.
228mm of rain over 30 days.
The most extreme days in this period:
Hottest day: 30.7°C
Heavy rain: 31.6mm in one day
1 day with dangerous heat index levels (40.6°C average). Temperature 30.7°C combined with 82% humidity creates hazardous conditions.
Average humidity of 86% indicates persistently moist air conditions. Heat sensation amplified during warm periods (24.8°C average temperature).
Stable humidity conditions with only 21% variation (74%-95%). Predictable moisture levels throughout period.