Weather forecast for 10 daysHarbour Island, FL
Weather forecast for the weekend
Sunday Oct 18, 2026
- 81°F
- 64°F
Mostly Sunny
- Precip. probability: 4%
- Precipitation: 0"
- Wind: 16mphNE 41°
- Humidity: 66%
- UV index: 8
- Sunrise: 7:32 am EDT
- Sunset: 6:57 pm EDT
- details ▼
On Sunday, in Harbour Island, blue skies and warm sunshine will define the conditions.
The highest temperature will be a warm 80.6°F, while the lowest temperature will be a comfortable 64.4°F.
The maximum heat index, which integrates air moisture with ambient temperature, is appraised at 84.2°F.
Sunrise will be at 7:32 am and sunset at 6:57 pm; the daylight will last for 11h and 26min.
The highest temperature will be a warm 80.6°F, while the lowest temperature will be a comfortable 64.4°F.
The maximum heat index, which integrates air moisture with ambient temperature, is appraised at 84.2°F.
Sunrise will be at 7:32 am and sunset at 6:57 pm; the daylight will last for 11h and 26min.
10-day overview
Daily temperatures
Maximum temperature: 82°C.
Coldest day: Sunday 25.10. 79°C.
Coldest day: Sunday 25.10. 79°C.
Chance of precipitation
Highest chance: Sunday 25.10. 13%.
Long-term weather forecast
- Sunday
- Oct 18, 2026
- 81°F
- 64°F
Mostly Sunny
- Precip. probability: 4%
- Precipitation: 0"
- Wind: 16mphNE 41°
- Humidity: 66%
- UV index: 8
- Sunrise: 7:32 am EDT
- Sunset: 6:57 pm EDT
- details ▼
- Monday
- Oct 19, 2026
- 82°F
- 59°F
Sunny
- Precip. probability: 10%
- Precipitation: 0"
- Wind: 13mphNE 38°
- Humidity: 69%
- UV index: 8
- Sunrise: 7:32 am EDT
- Sunset: 6:56 pm EDT
- details ▼
- Tuesday
- Oct 20, 2026
- 81°F
- 57°F
Sunny
- Precip. probability: 5%
- Precipitation: 0"
- Wind: 9mphNNE 30°
- Humidity: 63%
- UV index: 7
- Sunrise: 7:33 am EDT
- Sunset: 6:55 pm EDT
- details ▼
- Wednesday
- Oct 21, 2026
- 81°F
- 59°F
Sunny
- Precip. probability: 5%
- Precipitation: 0"
- Wind: 8mphNNE 24°
- Humidity: 65%
- UV index: 7
- Sunrise: 7:33 am EDT
- Sunset: 6:54 pm EDT
- details ▼
- Thursday
- Oct 22, 2026
- 81°F
- 57°F
Sunny
- Precip. probability: 5%
- Precipitation: 0"
- Wind: 7mphNNE 17°
- Humidity: 59%
- UV index: 7
- Sunrise: 7:34 am EDT
- Sunset: 6:53 pm EDT
- details ▼
- Friday
- Oct 23, 2026
- 81°F
- 63°F
Sunny
- Precip. probability: 5%
- Precipitation: 0"
- Wind: 9mphNNE 30°
- Humidity: 60%
- UV index: 7
- Sunrise: 7:35 am EDT
- Sunset: 6:53 pm EDT
- details ▼
- Saturday
- Oct 24, 2026
- 82°F
- 64°F
Mostly Sunny
- Precip. probability: 10%
- Precipitation: 0"
- Wind: 14mphNE 34°
- Humidity: 67%
- UV index: 7
- Sunrise: 7:35 am EDT
- Sunset: 6:52 pm EDT
- details ▼
- Sunday
- Oct 25, 2026
- 79°F
- 63°F
Mostly Sunny
- Precip. probability: 13%
- Precipitation: 0"
- Wind: 15mphNNE 28°
- Humidity: 70%
- UV index: 7
- Sunrise: 7:36 am EDT
- Sunset: 6:51 pm EDT
- details ▼
- Monday
- Oct 26, 2026
- 81°F
- 63°F
Partly Cloudy
- Precip. probability: 10%
- Precipitation: 0"
- Wind: 14mphNNE 26°
- Humidity: 68%
- UV index: 7
- Sunrise: 7:37 am EDT
- Sunset: 6:50 pm EDT
- details ▼
- Tuesday
- Oct 27, 2026
- 81°F
- 63°F
Partly Cloudy
- Precip. probability: 10%
- Precipitation: 0"
- Wind: 9mphNNE 21°
- Humidity: 67%
- UV index: 7
- Sunrise: 7:37 am EDT
- Sunset: 6:49 pm EDT
- details ▼
Primarily mostly clear and occasionally cloudy weather is predicted.
Rainfall is not forecasted in Harbour Island in the upcoming days.
Highs will stay within a very narrow margin across the forecast window. The maximum temperature will vary between 78.8°F and 82.4°F, while nighttime temperatures are expected to vary from 57.2°F to 64.4°F.
The warmest days will be Monday and Saturday, with a maximum of 82.4°F; expect the coldest day on next Sunday with a high of 78.8°F.
Rainfall is not forecasted in Harbour Island in the upcoming days.
Highs will stay within a very narrow margin across the forecast window. The maximum temperature will vary between 78.8°F and 82.4°F, while nighttime temperatures are expected to vary from 57.2°F to 64.4°F.
The warmest days will be Monday and Saturday, with a maximum of 82.4°F; expect the coldest day on next Sunday with a high of 78.8°F.
Updated: Oct 18, 2026 @ 04:33:23 UTC
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate
Frequently asked questions
On Sunday, mostly sunny skies are expected.
Today, the highest temperature will be 80.6°F, while the lowest temperature will be 64.4°F. The maximum heat index, which integrates air moisture with ambient temperature, is calculated to be 84.2°F.
On Sunday, in Harbour Island, sunrise will be at 7:32 am and sunset at 6:57 pm (EDT).
In Harbour Island, today, there will be 11h and 26min of daylight.
