Alcoa, United States experiences average highs of 21°C (70°F) and lows of 11°C (52°F) throughout the year. Rainfall is moderate, averaging about 12 rainy days per month. Sunshine is abundant, averaging about 9 hours per day. Average highs have cooled by 0.9°C (1.6°F) across the available records.
Alcoa, United States Weather & Climate 2026
Monthly climate averages for Alcoa, United States. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Mar–Dec 
Wetter season: Jan–Aug At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
6.2/10
Best: May, June, September, October
UV Index
5
Low
Temperature 21°C / 11°C
Feels Like 21°C / 11°C
Rainy Days 12
Rainfall 106 mm
Sunshine 9 h
Humidity 72%
Wind Speed 13 km/h
Dew Point 11°C
Snow Days 2 days
Frost Days 7 days
Hottest Month
32°C
July
Avg Low22°C
Rain14days
Coldest Month
1°C
January
Avg High9°C
Rain13days
Driest Month
7days
October
Avg High23°C
Avg Low12°C
Windiest Month
16 km/h
March (Gusts 41)
Worst Time to Visit
Consider avoiding January, February, December due to frequent rain.
Sun Position
Sunrise 06:21
Daylight 14.6h
Sunset 20:55
Live conditions—
Alcoa on the map · live conditions
Alcoa, United States
- Continent
- Americas
- Country
- United States
- City
- Alcoa
- Population
- 9.3K
- Elevation
- 257 m
- Coordinates
- 35.79°, -83.97°
Seasonal Breakdown
Spring
Mar–May
Avg High 21°C
Avg Low 10°C
Rain 12 days/mo
1/3 best months
Summer
Jun–Aug
Avg High 30°C
Avg Low 20°C
Rain 13 days/mo
1/3 best months
Autumn
Sep–Nov
Avg High 22°C
Avg Low 12°C
Rain 8 days/mo
2/3 best months
Winter
Dec–Feb
Avg High 12°C
Avg Low 2°C
Rain 13 days/mo
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 9°C / 1°C . Feb: 14°C / 4°C . Mar: 17°C / 6°C . Apr: 21°C / 10°C . May: 25°C / 15°C . Jun: 30°C / 19°C . Jul: 32°C / 22°C . Aug: 30°C / 21°C . Sep: 28°C / 18°C . Oct: 23°C / 12°C . Nov: 16°C / 6°C . Dec: 12°C / 3°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 124 mm. Feb: 153 mm. Mar: 126 mm. Apr: 103 mm. May: 113 mm. Jun: 85 mm. Jul: 98 mm. Aug: 112 mm. Sep: 81 mm. Oct: 78 mm. Nov: 80 mm. Dec: 116 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 73%. Feb: 74%. Mar: 68%. Apr: 69%. May: 74%. Jun: 70%. Jul: 72%. Aug: 74%. Sep: 70%. Oct: 70%. Nov: 72%. Dec: 76%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 15 km/h . Feb: 16 km/h . Mar: 16 km/h . Apr: 15 km/h . May: 13 km/h . Jun: 12 km/h . Jul: 10 km/h . Aug: 10 km/h . Sep: 10 km/h . Oct: 12 km/h . Nov: 13 km/h . Dec: 14 km/h .
Sunshine
Sunshine
Sunshine: Jan: 6h. Feb: 6h. Mar: 8h. Apr: 10h. May: 11h. Jun: 11h. Jul: 12h. Aug: 11h. Sep: 10h. Oct: 9h. Nov: 7h. Dec: 6h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 3. Feb: UV 4. Mar: UV 5. Apr: UV 7. May: UV 7. Jun: UV 8. Jul: UV 8. Aug: UV 7. Sep: UV 6. Oct: UV 5. Nov: UV 3. Dec: UV 3.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Snow Days
Snow DaysSnowfall
Snow Days: Jan: 4 days. Feb: 3 days. Mar: 1 days. Apr: 0 days. May: 0 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 0 days. Nov: 1 days. Dec: 2 days.
Climate Trends
Average highs have cooled by 0.9°C (1.6°F) across the available records. Average rainfall is trending wetter by about 19 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jul 2025 · 33°C | Jul · 32°C |
| Coldest month | Jan 2025 · -3°C | Jan · 1°C |
| Wettest month | May 2025 · 167 mm | Feb · 153 mm |
| Windiest month | Mar 2025 · 19 km/h | Mar · 16 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Fair April
Good May best
Excellent June best
Excellent July
Fair August
Fair September best
Excellent October best
Excellent November
Fair December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 9°C / 1°C | 7°C / -3°C | 13days (124 mm) Wet | 6.1h Fair | 73% Muggy | 2.7 Moderate | Poor | View Details |
| February | 14°C / 4°C | 11°C / 1°C | 13days (153 mm) Wet | 6.3h Fair | 74% Muggy | 3.9 Moderate | Poor | View Details |
| March | 17°C / 6°C | 15°C / 3°C | 12days (126 mm) Wet | 8.2h Good | 68% Muggy | 5.4 High | Fair | View Details |
| April | 21°C / 10°C | 21°C / 8°C | 11days (103 mm) Wet | 9.7h Good | 69% Muggy | 6.5 High | Good | View Details |
| May best | 25°C / 15°C | 26°C / 15°C | 13days (113 mm) Wet | 10.5h Excellent | 74% Muggy | 6.8 High | Excellent | View Details |
| June best | 30°C / 19°C | 32°C / 21°C | 13days (85 mm) Wet | 11.4h Excellent | 70% Muggy | 7.7 Very High | Excellent | View Details |
| July | 32°C / 22°C | 35°C / 25°C | 14days (98 mm) Wet | 11.5h Excellent | 72% Muggy | 7.6 Very High | Fair | View Details |
| August | 30°C / 21°C | 34°C / 24°C | 13days (112 mm) Wet | 11h Excellent | 74% Muggy | 7.2 Very High | Fair | View Details |
| September best | 28°C / 18°C | 30°C / 19°C | 9days (81 mm) Wet | 9.8h Good | 70% Muggy | 6.1 High | Excellent | View Details |
| October best | 23°C / 12°C | 23°C / 11°C | 7days (78 mm) Good | 8.7h Good | 70% Muggy | 4.8 Moderate | Excellent | View Details |
| November | 16°C / 6°C | 14°C / 4°C | 8days (80 mm) Wet | 7.4h Good | 72% Muggy | 3.4 Moderate | Fair | View Details |
| December | 12°C / 3°C | 9°C / 0°C | 12days (116 mm) Wet | 5.8h Fair | 76% Humid | 2.7 Moderate | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Alcoa are May, June, September, October, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Alcoa, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Alcoa is July, with average daytime highs of 32°C (89°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Alcoa is January, with average overnight lows of 1°C (33°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Alcoa is February, averaging 153mm of precipitation across 13 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Alcoa runs through July, January, February, May, with the heaviest rainfall in July. Based on 10-year averages for Alcoa.
Alcoa receives approximately 106 sunshine hours per year. The sunniest month is July with around 12 hours. Based on climate data for Alcoa.
The least favorable months to visit Alcoa are January, February, December, primarily due to frequent rain. For the best conditions, consider May, June, September, October instead.
The annual average UV index in Alcoa is 5, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Alcoa is 72%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes, Alcoa receives snow. Months with snowfall average 2 snow days and 3 cm (1 in) of accumulation, with about 7 frost days during winter.
Average wind speeds in Alcoa are 13 km/h (8 mph). The windiest month is March with peak winds reaching 16 km/h (10 mph) (gusts up to 41 km/h / 25 mph).
Alcoa averages 5 clear-sky days per month with overall cloud cover around 57%. The clearest skies occur in October.
The annual average dew point in Alcoa is 11°C (52°F), which feels pleasant with low humidity. Outdoor activities are comfortable year-round from a humidity standpoint.
Alcoa has a Humid Subtropical climate, classified as Cfa under the Köppen system. Temperate climates have mild winters and warm summers, with rainfall spread across the year and four distinct seasons.
The 'feels like' temperature in Alcoa ranges from 11°C (52°F) to 21°C (70°F) on average. The 'feels like' temperature closely matches the actual temperature throughout most of the year.
Yes, June is a great time to visit Alcoa. It earns a climate score of 7.5/10 with Excellent.
For June in Alcoa, pack Umbrella, Waterproof jacket, Breathable clothing, Sunscreen (SPF 30+), Sun hat. With average highs of 30°C (85°F) and 13 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
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