Portland weather in October: Portland, Maine: normal highs, lows, rain and records for October
Portland in October has a normal high of 60°F and a normal low of 41°F, a daily mean of 50°F, falling from 65°F on the 1st to 54°F by the 31st. Measurable precipitation falls on 11 days in a normal October, 5.25 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 15°C and low of 5°C, 133 mm of precipitation and 1 cm of snow in October.
- NOAA stationPortland International Jetport
- Station IDUSW00014764
- Location43.65°N 70.30°W
- Elevation45 ft (14 m)
- From the center6 miles
- Population69,568
- Jan 32° 16°
- Feb 35° 17°
- Mar 42° 26°
- Apr 54° 35°
- May 64° 46°
- Jun 74° 55°
- Jul 80° 61°
- Aug 79° 60°
- Sep 71° 52°
- Oct 60° 41°
- Nov 48° 32°
- Dec 38° 22°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Portland in October?
The normal high is 60°F and the normal low 41°F, for a daily mean of 50.3°F. October is 11.3°F cooler than September and 10.3°F warmer than November. October is the 6th warmest month of the year in Portland and the wettest. Across the month the normal high falls 11°F, from 65°F on October 1 to 54°F on October 31. From one year to the next October's mean temperature typically moves about 2.5°F either way (NOAA's standard deviation), so roughly two Octobers in three average between 48°F and 53°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 36%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| October 1 | 65°F | 46°F | 33% | 20% |
| October 8 | 62°F | 44°F | 34% | 21% |
| October 15 | 60°F | 41°F | 34% | 22% |
| October 22 | 57°F | 39°F | 35% | 22% |
| October 31 | 54°F | 36°F | 36% | 23% |
Every day of October: normal high, low and chance of precipitation (warmest afternoon October 1, coldest night October 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| October 1 | 65°F | 46°F | 33% | 20% | 11 h 50 min |
| October 2 | 65°F | 46°F | 33% | 20% | 11 h 40 min |
| October 3 | 64°F | 46°F | 33% | 20% | 11 h 40 min |
| October 4 | 64°F | 45°F | 33% | 21% | 11 h 40 min |
| October 5 | 64°F | 45°F | 33% | 21% | 11 h 40 min |
| October 6 | 63°F | 44°F | 33% | 21% | 11 h 30 min |
| October 7 | 63°F | 44°F | 33% | 21% | 11 h 30 min |
| October 8 | 62°F | 44°F | 34% | 21% | 11 h 30 min |
| October 9 | 62°F | 43°F | 34% | 21% | 11 h 20 min |
| October 10 | 62°F | 43°F | 34% | 21% | 11 h 20 min |
| October 11 | 61°F | 43°F | 34% | 21% | 11 h 20 min |
| October 12 | 61°F | 42°F | 34% | 22% | 11 h 10 min |
| October 13 | 61°F | 42°F | 34% | 22% | 11 h 10 min |
| October 14 | 60°F | 42°F | 34% | 22% | 11 h 10 min |
| October 15 | 60°F | 41°F | 34% | 22% | 11 h 10 min |
| October 16 | 59°F | 41°F | 35% | 22% | 11 h |
| October 17 | 59°F | 41°F | 35% | 22% | 11 h |
| October 18 | 59°F | 40°F | 35% | 22% | 11 h |
| October 19 | 58°F | 40°F | 35% | 22% | 10 h 50 min |
| October 20 | 58°F | 40°F | 35% | 22% | 10 h 50 min |
| October 21 | 58°F | 39°F | 35% | 22% | 10 h 50 min |
| October 22 | 57°F | 39°F | 35% | 22% | 10 h 50 min |
| October 23 | 57°F | 39°F | 35% | 22% | 10 h 40 min |
| October 24 | 57°F | 38°F | 35% | 22% | 10 h 40 min |
| October 25 | 56°F | 38°F | 35% | 22% | 10 h 40 min |
| October 26 | 56°F | 38°F | 35% | 22% | 10 h 30 min |
| October 27 | 56°F | 38°F | 36% | 23% | 10 h 30 min |
| October 28 | 55°F | 37°F | 36% | 23% | 10 h 30 min |
| October 29 | 55°F | 37°F | 36% | 23% | 10 h 30 min |
| October 30 | 54°F | 37°F | 36% | 23% | 10 h 20 min |
| October 31 | 54°F | 36°F | 36% | 23% | 10 h 20 min |
- Normal high
- 60°FOctober average
- Normal low
- 41°FOctober average
- Precipitation
- 5.25 inmonth total
- Days with precipitation
- 110.01 inch or more
- Snowfall
- 0.2 inmonth total
- Nights at 32°F or colder
- 6
- Daylight
- 11 h 50 min to 10 h 20 minOctober 1 to October 31
- Days at 70°F or more
- 3
- Sunshine
- 70%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014764; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in Portland in October?
On a given October day the chance of 0.01 inch or more is 34% on average, highest around October 30 (36%). In all, 5.25 in falls on 11 days of a normal October, 1 of them with an inch or more.
In a normal October in Portland, 6 nights fall to freezing and snowfall averages 0.2 inches.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014764.
How humid and windy is Portland in October?
At 3 p.m. the normal temperature is 51°F with 57% relative humidity and a dew point of 37°F; at 6 a.m. it is 40°F with 81% humidity. The wind averages 7.8 mph, most often from the west in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 40°F | 35°F | 81% | 6.3 mph | 52% |
| 9 a.m. | 46°F | 37°F | 70% | 8.6 mph | 48% |
| noon | 51°F | 37°F | 57% | 10.5 mph | 45% |
| 3 p.m. | 51°F | 37°F | 57% | 10.6 mph | – |
| 6 p.m. | 47°F | 37°F | 68% | 7.6 mph | – |
| 9 p.m. | 44°F | 36°F | 73% | 6.9 mph | 53% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00014764. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for October in Portland?
The warmest October temperature on Portland's official record (since 1874) is 88°F, on October 7, 1963; the coldest is 15°F, on October 28, 1976. The wettest October brought 16.86 in (1996); the snowiest, 5.2 inches (2011).
The October mean against the 1991-2020 normal of 50.3°F: 2021 53.9°F (+3.6), 2022 51.0°F (+0.7), 2023 54.5°F (+4.2), 2024 50.7°F (+0.4), 2025 52.4°F (+2.1). 5 of 5 ran warmer than normal.
| October | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 53.9°F | +3.6°F | 7.18 in |
| 2022 | 51.0°F | +0.7°F | 7.83 in |
| 2023 | 54.5°F | +4.2°F | 2.93 in |
| 2024 | 50.7°F | +0.4°F | 1.68 in |
| 2025 | 52.4°F | +2.1°F | 3.53 in |
Source: records: ACIS, NWS threaded record PWMthr; recent months: ACIS, station USW00014764. Records and recent months use complete months only.
How does October in Portland compare across Maine?
Across the 42 places PlainClimate covers in Maine, October normal highs run from 51°F in Limestone to 61°F in Sanford; Portland's is 60°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.