Monthly climate averages for Normal, United States. Based on 10-year ERA5 reanalysis data.
Cfa Humid Subtropical
Climate OverviewNormal, United States in September has warm conditions, with highs averaging 25.9°C (79°F).
This month falls at the beginning of Autumn.
Daily highs in September gradually drop from around 26°C (80°F) at the start to 24°C (75°F) by month's end.
September sees fairly even rainfall, totalling about 62 mm across the month.
Expect around 10.6h of sunshine at the start of September, decreasing to 8.6h by the end.
The warmest days tend to fall around the 18th, averaging 27.8°C (82°F).
Compared to August, this month is about 2°C cooler with 3 fewer rainy days. Temperatures begin dropping heading into October.
Daily averages based on historical data (2016–2025)
Daytime temperatures around 26°C (79°F) are ideal for full-day outdoor exploration.
Rain usually comes in shorter passing showers rather than all-day rain.
Recent yearly records for September have stayed close to the long-run average.
| Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 2°C / -6°C | -3°C / -11°C | 9days (59 mm) Wet | 5.2h Fair | 72% Muggy | 2.4 Moderate | Poor | View Details |
| February | 5°C / -4°C | 1°C / -10°C | 9days (60 mm) Wet | 6.9h Fair | 69% Muggy | 3.6 Moderate | Poor | View Details |
| March | 12°C / 2°C | 8°C / -3°C | 11days (107 mm) Wet | 7.6h Good | 66% Muggy | 4.8 Moderate | Poor | View Details |
| April | 17°C / 6°C | 14°C / 2°C | 12days (114 mm) Wet | 8.9h Good | 65% Muggy | 5.5 High | Fair | View Details |
| May best | 23°C / 13°C | 23°C / 11°C | 13days (124 mm) Wet | 10.1h Excellent | 69% Muggy | 6.7 High | Excellent | View Details |
| June best | 28°C / 18°C | 30°C / 18°C | 11days (106 mm) Wet | 12h Excellent | 67% Muggy | 7.3 Very High | Excellent | View Details |
| July best | 29°C / 20°C | 32°C / 22°C | 12days (111 mm) Wet | 12h Excellent | 74% Muggy | 7.2 Very High | Good | View Details |
| August best | 28°C / 19°C | 30°C / 20°C | 10days (92 mm) Wet | 11.1h Excellent | 72% Muggy | 6.7 High | Excellent | View Details |
| September best | 26°C / 17°C | 27°C / 16°C | 7days (62 mm) Good | 9.9h Good | 67% Muggy | 5.6 High | Excellent | View Details |
| October | 19°C / 10°C | 17°C / 7°C | 9days (94 mm) Wet | 7.5h Good | 66% Muggy | 4.2 Moderate | Good | View Details |
| November | 11°C / 2°C | 7°C / -2°C | 7days (59 mm) Good | 6.5h Fair | 68% Muggy | 2.8 Moderate | Poor | View Details |
| December | 5°C / -3°C | 1°C / -7°C | 8days (57 mm) Wet | 5.4h Fair | 72% Muggy | 2.1 Moderate | Poor | View Details |
Summer clothing like shorts, t-shirts, and sundresses will be comfortable. Bring a light cardigan for air-conditioned spaces.
A waterproof jacket or compact umbrella is recommended for occasional showers.
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