Weather Forecast for Portland
Maine, United States of America
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Current Weather - Portland: 3°C
Current Weather - Portland: 3°C
Maine, United States of America
Sunny
Feels like 2°C
Wind
5 km/h WSW
Humidity
85%
Pressure
1014 mb
UV Index
0
Visibility
16 km
Moderate rain
Saturday, May 09, 2026
High
13°C
Low
4°C
Rain Chance
92%
Hourly Forecast
11°C
9°C
8°C
8°C
7°C
7°C
8°C
8°C
8°C
8°C
8°C
8°C
Day Statistics
Maximum Wind
23 km/h
Humidity
78%
Precipitation
5 mm
UV Index
4
Visibility
7 km
Rain Chance
92%
Snow Chance
0%
Sun & Moon
Sunrise
05:23 AM
Sunset
07:53 PM
Moonrise
01:50 AM
Moonset
11:38 AM
Moon Phase
Last Quarter
Moon Illumination
59%
Air Quality
PM2.5
7
μg/m³
PM10
8
μg/m³
NO₂
7.2
μg/m³
O₃
71.9
μg/m³
SO₂
1.9
μg/m³
CO
172.4
μg/m³
Patchy rain nearby
Sunday, May 10, 2026
High
16°C
Low
8°C
Rain Chance
86%
Hourly Forecast
8°C
9°C
9°C
9°C
9°C
9°C
9°C
10°C
10°C
11°C
12°C
14°C
15°C
15°C
15°C
15°C
14°C
14°C
13°C
12°C
12°C
12°C
12°C
12°C
Day Statistics
Maximum Wind
17 km/h
Humidity
87%
Precipitation
1 mm
UV Index
5
Visibility
7 km
Rain Chance
86%
Snow Chance
0%
Sun & Moon
Sunrise
05:22 AM
Sunset
07:54 PM
Moonrise
02:13 AM
Moonset
12:46 PM
Moon Phase
Waning Crescent
Moon Illumination
49%
Air Quality
PM2.5
7
μg/m³
PM10
8.1
μg/m³
NO₂
5
μg/m³
O₃
100
μg/m³
SO₂
1.9
μg/m³
CO
157
μg/m³
Moderate rain
Monday, May 11, 2026
High
10°C
Low
9°C
Rain Chance
88%
Hourly Forecast
12°C
11°C
11°C
10°C
10°C
9°C
9°C
9°C
9°C
9°C
9°C
9°C
9°C
10°C
10°C
10°C
10°C
10°C
10°C
9°C
9°C
9°C
9°C
8°C
Day Statistics
Maximum Wind
10 km/h
Humidity
95%
Precipitation
13 mm
UV Index
2
Visibility
5 km
Rain Chance
88%
Snow Chance
0%
Sun & Moon
Sunrise
05:21 AM
Sunset
07:55 PM
Moonrise
02:34 AM
Moonset
01:55 PM
Moon Phase
Waning Crescent
Moon Illumination
39%
Air Quality
PM2.5
7.3
μg/m³
PM10
7.9
μg/m³
NO₂
6.2
μg/m³
O₃
72.6
μg/m³
SO₂
1.9
μg/m³
CO
200.1
μg/m³
Patchy rain nearby
Tuesday, May 12, 2026
High
14°C
Low
6°C
Rain Chance
80%
Hourly Forecast
8°C
8°C
7°C
7°C
6°C
6°C
7°C
8°C
9°C
11°C
12°C
12°C
12°C
13°C
13°C
13°C
13°C
13°C
12°C
11°C
11°C
10°C
9°C
9°C
Day Statistics
Maximum Wind
26 km/h
Humidity
65%
Precipitation
0 mm
UV Index
1
Visibility
10 km
Rain Chance
80%
Snow Chance
0%
Sun & Moon
Sunrise
05:19 AM
Sunset
07:56 PM
Moonrise
02:54 AM
Moonset
03:07 PM
Moon Phase
Waning Crescent
Moon Illumination
29%
Air Quality
PM2.5
3.8
μg/m³
PM10
4
μg/m³
NO₂
4.6
μg/m³
O₃
71.4
μg/m³
SO₂
1.6
μg/m³
CO
188.3
μg/m³
Sunny
Wednesday, May 13, 2026
High
14°C
Low
6°C
Rain Chance
0%
Hourly Forecast
8°C
7°C
7°C
7°C
6°C
6°C
7°C
8°C
9°C
10°C
12°C
12°C
12°C
13°C
13°C
13°C
13°C
13°C
12°C
11°C
11°C
11°C
11°C
10°C
Day Statistics
Maximum Wind
25 km/h
Humidity
59%
Precipitation
0 mm
UV Index
3
Visibility
10 km
Rain Chance
0%
Snow Chance
0%
Sun & Moon
Sunrise
05:18 AM
Sunset
07:57 PM
Moonrise
03:14 AM
Moonset
04:21 PM
Moon Phase
Waning Crescent
Moon Illumination
19%
Air Quality
PM2.5
3.7
μg/m³
PM10
3.7
μg/m³
NO₂
4.7
μg/m³
O₃
61.5
μg/m³
SO₂
1.6
μg/m³
CO
156.5
μg/m³
Moderate rain
Thursday, May 14, 2026
High
9°C
Low
8°C
Rain Chance
78%
Hourly Forecast
10°C
9°C
9°C
9°C
8°C
8°C
8°C
8°C
8°C
8°C
8°C
8°C
9°C
9°C
9°C
9°C
9°C
9°C
9°C
9°C
9°C
9°C
9°C
9°C
Day Statistics
Maximum Wind
27 km/h
Humidity
96%
Precipitation
19 mm
UV Index
2
Visibility
7 km
Rain Chance
78%
Snow Chance
0%
Sun & Moon
Sunrise
05:17 AM
Sunset
07:58 PM
Moonrise
03:36 AM
Moonset
05:40 PM
Moon Phase
Waning Crescent
Moon Illumination
11%
Patchy rain nearby
Friday, May 15, 2026
High
15°C
Low
10°C
Rain Chance
81%
Hourly Forecast
9°C
10°C
10°C
10°C
10°C
10°C
10°C
10°C
10°C
11°C
12°C
12°C
13°C
14°C
14°C
14°C
13°C
13°C
12°C
12°C
11°C
11°C
11°C
10°C
Day Statistics
Maximum Wind
16 km/h
Humidity
91%
Precipitation
2 mm
UV Index
3
Visibility
9 km
Rain Chance
81%
Snow Chance
0%
Sun & Moon
Sunrise
05:16 AM
Sunset
07:59 PM
Moonrise
04:02 AM
Moonset
07:02 PM
Moon Phase
Waning Crescent
Moon Illumination
5%
Solar Radiation Data
Shortwave Radiation
2.76
Diffuse Radiation
1.22
DNI
2.07
GTI
1.83
Weather Alerts
Frost Advisory issued May 8 at 7:47PM EDT until May 9 at 8:00AM EDT by NWS Gray ME
* WHAT...Temperatures as low as 32 will result in frost formation. * WHERE...In Maine, Central Interior Cumberland, Kennebec, Androscoggin, and Interior York Counties. In New Hampshire, Strafford and Interior Rockingham Counties. * WHEN...From midnight tonight to 8 AM EDT Saturday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.
Take steps now to protect tender plants from the cold.
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