Monthly climate averages for Appleton, United States. Based on 10-year ERA5 reanalysis data.
Dfa Hot-Summer Continental
Climate OverviewAppleton, United States in September has warm conditions, with highs averaging 22.5°C (73°F).
This month falls at the beginning of Autumn.
Daily highs in September gradually drop from around 24°C (75°F) at the start to 20°C (67°F) by month's end.
September sees fairly even rainfall, totalling about 67 mm across the month.
Expect around 9.9h of sunshine at the start of September, decreasing to 8.1h by the end.
The warmest days tend to fall around the 15th, averaging 24.4°C (76°F).
Compared to August, this month is about 3°C cooler with 1 fewer rainy days. Temperatures begin dropping heading into October.
Daily averages based on historical data (2016–2025)
Daytime temperatures around 23°C (73°F) are ideal for full-day outdoor exploration.
Rain usually comes in shorter passing showers rather than all-day rain.
1 of the last 5 yearly records were warmer than this month's long-run average.
| Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | -3°C / -10°C | -8°C / -15°C | 7days (37 mm) Good | 5.3h Fair | 76% Humid | 2.1 Moderate | Poor | View Details |
| February | 0°C / -10°C | -5°C / -15°C | 6days (39 mm) Good | 7h Good | 73% Muggy | 3.3 Moderate | Poor | View Details |
| March | 6°C / -3°C | 2°C / -8°C | 9days (76 mm) Wet | 7.7h Good | 68% Muggy | 4.1 Moderate | Poor | View Details |
| April | 12°C / 2°C | 9°C / -2°C | 12days (93 mm) Wet | 8.6h Good | 68% Muggy | 5.1 High | Poor | View Details |
| May best | 19°C / 9°C | 18°C / 6°C | 11days (91 mm) Wet | 10.2h Excellent | 68% Muggy | 6 High | Good | View Details |
| June best | 25°C / 16°C | 26°C / 15°C | 11days (102 mm) Wet | 11.5h Excellent | 68% Muggy | 6.6 High | Excellent | View Details |
| July best | 27°C / 18°C | 29°C / 19°C | 10days (102 mm) Wet | 12.3h Excellent | 71% Muggy | 6.8 High | Excellent | View Details |
| August best | 26°C / 17°C | 27°C / 18°C | 10days (94 mm) Wet | 10.8h Excellent | 72% Muggy | 6.1 High | Excellent | View Details |
| September best | 23°C / 14°C | 22°C / 13°C | 9days (66 mm) Wet | 9.1h Good | 74% Muggy | 5 Moderate | Excellent | View Details |
| October | 15°C / 8°C | 12°C / 4°C | 10days (77 mm) Wet | 7h Good | 71% Muggy | 3.4 Moderate | Fair | View Details |
| November | 7°C / 0°C | 3°C / -4°C | 7days (53 mm) Good | 6h Fair | 71% Muggy | 2.2 Moderate | Poor | View Details |
| December | 0°C / -7°C | -5°C / -12°C | 8days (48 mm) Wet | 4.8h Fair | 76% Humid | 1.8 Low | Poor | View Details |
Dress in layers — a mix of long sleeves, light sweaters, and a versatile jacket works best for changeable conditions.
A waterproof jacket or compact umbrella is recommended for occasional showers.
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