Monthly climate averages for Willimantic, United States. Based on 10-year ERA5 reanalysis data.
Cfa Humid Subtropical
Climate OverviewWillimantic, United States in August has warm conditions, with highs averaging 27.7°C (82°F). Rain falls on about 11 days this month.
This month falls at the end of Summer.
Temperatures remain fairly steady throughout August, with daily highs around 28°C (82°F).
August sees fairly even rainfall, totalling about 100 mm across the month.
Expect around 10.8h of sunshine at the start of August, decreasing to 10.2h by the end.
The warmest days tend to fall around the 11th, averaging 28.8°C (84°F).
Compared to July, this month is about 1°C cooler with 2 fewer rainy days. Temperatures begin dropping heading into September.
Daily averages based on historical data (2016–2025)
Daytime temperatures around 28°C (82°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 / -4°C | -1°C / -9°C | 9days (90 mm) Wet | 5.9h Fair | 68% Muggy | 2.2 Moderate | Poor | View Details |
| February | 5°C / -3°C | 1°C / -8°C | 10days (84 mm) Wet | 6.7h Fair | 70% Muggy | 3.3 Moderate | Poor | View Details |
| March | 9°C / 0°C | 6°C / -5°C | 11days (98 mm) Wet | 8h Good | 66% Muggy | 4.4 Moderate | Poor | View Details |
| April | 15°C / 5°C | 12°C / 1°C | 12days (104 mm) Wet | 8.5h Good | 68% Muggy | 5.2 High | Fair | View Details |
| May | 20°C / 10°C | 20°C / 9°C | 12days (107 mm) Wet | 9.3h Good | 73% Muggy | 6.1 High | Good | View Details |
| June best | 26°C / 16°C | 27°C / 16°C | 11days (82 mm) Wet | 10.7h Excellent | 72% Muggy | 6.9 High | Excellent | View Details |
| July best | 29°C / 20°C | 31°C / 22°C | 13days (129 mm) Wet | 10.9h Excellent | 76% Humid | 7 High | Good | View Details |
| August best | 28°C / 19°C | 30°C / 20°C | 11days (100 mm) Wet | 10.2h Excellent | 75% Muggy | 6.4 High | Excellent | View Details |
| September best | 24°C / 15°C | 24°C / 15°C | 10days (104 mm) Wet | 8.3h Good | 77% Humid | 5.1 High | Excellent | View Details |
| October best | 18°C / 10°C | 17°C / 8°C | 10days (105 mm) Wet | 7h Good | 77% Humid | 3.9 Moderate | Good | View Details |
| November | 11°C / 3°C | 8°C / -1°C | 9days (79 mm) Wet | 6.6h Fair | 72% Muggy | 2.8 Moderate | Poor | View Details |
| December | 5°C / -2°C | 2°C / -6°C | 10days (127 mm) Wet | 5.5h Fair | 73% Muggy | 2 Low | 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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