Portland weather in July: Portland, Maine: normal highs, lows, rain and records for July
Portland in July has a normal high of 80°F and a normal low of 61°F, a daily mean of 70°F, rising from 78°F on the 1st to 80°F by the 31st. Measurable precipitation falls on 11 days in a normal July, 3.43 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 26°C and low of 16°C, 87 mm of precipitation in July.
- 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 July?
The normal high is 80°F and the normal low 61°F, for a daily mean of 70.4°F. July is 6.1°F warmer than June and 1.2°F warmer than August. July is the warmest month of the year in Portland and the 12th wettest. Across the month the normal high rises 2°F, from 78°F on July 1 to 80°F on July 31. From one year to the next July's mean temperature typically moves about 2.1°F either way (NOAA's standard deviation), so roughly two Julys in three average between 68°F and 73°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 |
|---|---|---|---|---|
| July 1 | 78°F | 59°F | 36% | 22% |
| July 8 | 79°F | 61°F | 36% | 22% |
| July 15 | 80°F | 62°F | 35% | 22% |
| July 22 | 80°F | 62°F | 34% | 21% |
| July 31 | 80°F | 62°F | 33% | 20% |
Every day of July: normal high, low and chance of precipitation (warmest afternoon July 20, coldest night July 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| July 1 | 78°F | 59°F | 36% | 22% | 15 h 20 min |
| July 2 | 78°F | 60°F | 36% | 22% | 15 h 20 min |
| July 3 | 78°F | 60°F | 36% | 22% | 15 h 20 min |
| July 4 | 79°F | 60°F | 36% | 22% | 15 h 20 min |
| July 5 | 79°F | 60°F | 36% | 22% | 15 h 20 min |
| July 6 | 79°F | 60°F | 36% | 22% | 15 h 20 min |
| July 7 | 79°F | 61°F | 36% | 22% | 15 h 20 min |
| July 8 | 79°F | 61°F | 36% | 22% | 15 h 20 min |
| July 9 | 79°F | 61°F | 36% | 22% | 15 h 20 min |
| July 10 | 79°F | 61°F | 36% | 22% | 15 h 20 min |
| July 11 | 79°F | 61°F | 35% | 22% | 15 h 10 min |
| July 12 | 80°F | 61°F | 35% | 22% | 15 h 10 min |
| July 13 | 80°F | 61°F | 35% | 22% | 15 h 10 min |
| July 14 | 80°F | 62°F | 35% | 22% | 15 h 10 min |
| July 15 | 80°F | 62°F | 35% | 22% | 15 h 10 min |
| July 16 | 80°F | 62°F | 35% | 22% | 15 h 10 min |
| July 17 | 80°F | 62°F | 35% | 22% | 15 h 10 min |
| July 18 | 80°F | 62°F | 35% | 21% | 15 h |
| July 19 | 80°F | 62°F | 35% | 21% | 15 h |
| July 20 | 80°F | 62°F | 34% | 21% | 15 h |
| July 21 | 80°F | 62°F | 34% | 21% | 15 h |
| July 22 | 80°F | 62°F | 34% | 21% | 15 h |
| July 23 | 80°F | 62°F | 34% | 21% | 15 h |
| July 24 | 80°F | 62°F | 34% | 21% | 14 h 50 min |
| July 25 | 80°F | 62°F | 34% | 21% | 14 h 50 min |
| July 26 | 80°F | 62°F | 34% | 21% | 14 h 50 min |
| July 27 | 80°F | 62°F | 34% | 20% | 14 h 50 min |
| July 28 | 80°F | 62°F | 33% | 20% | 14 h 50 min |
| July 29 | 80°F | 62°F | 33% | 20% | 14 h 40 min |
| July 30 | 80°F | 62°F | 33% | 20% | 14 h 40 min |
| July 31 | 80°F | 62°F | 33% | 20% | 14 h 40 min |
- Normal high
- 80°FJuly average
- Normal low
- 61°FJuly average
- Precipitation
- 3.43 inmonth total
- Days with precipitation
- 110.01 inch or more
- Days at 90°F or more
- 2
- Daylight
- 15 h 20 min to 14 h 40 minJuly 1 to July 31
- Days at 70°F or more
- 29
- Days at 80°F or more
- 15
- Sunshine
- 77%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 in Portland in July?
On a given July day the chance of 0.01 inch or more is 35% on average, highest around July 1 (36%). In all, 3.43 in falls on 11 days of a normal July, 1 of them with an inch or more.
In a normal July in Portland, 2 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014764.
How humid and windy is Portland in July?
At 3 p.m. the normal temperature is 76°F with 60% relative humidity and a dew point of 61°F; at 6 a.m. it is 65°F with 87% humidity. The wind averages 6.3 mph, most often from the south in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 65°F | 61°F | 87% | 4.1 mph | – |
| 9 a.m. | 73°F | 62°F | 67% | 6.6 mph | 58% |
| noon | 77°F | 61°F | 59% | 9.2 mph | 45% |
| 3 p.m. | 76°F | 61°F | 60% | 10.3 mph | 51% |
| 6 p.m. | 72°F | 61°F | 68% | 7.8 mph | – |
| 9 p.m. | 68°F | 61°F | 79% | 4.7 mph | 64% |
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 July in Portland?
The warmest July temperature on Portland's official record (since 1874) is 103°F, on July 4, 1911; the coldest is 40°F, on July 3, 1962. The wettest July brought 10.84 in (1915).
The July mean against the 1991-2020 normal of 70.4°F: 2021 67.3°F (−3.1), 2022 72.2°F (+1.8), 2023 71.5°F (+1.1), 2024 73.1°F (+2.7), 2025 71.3°F (+0.9), 2026 71.0°F (+0.6). 5 of 6 ran warmer than normal.
| July | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 67.3°F | −3.1°F | 9.44 in |
| 2022 | 72.2°F | +1.8°F | 1.28 in |
| 2023 | 71.5°F | +1.1°F | 5.75 in |
| 2024 | 73.1°F | +2.7°F | 2.58 in |
| 2025 | 71.3°F | +0.9°F | 2.51 in |
| 2026 | 71.0°F | +0.6°F | 0.63 in |
Source: records: ACIS, NWS threaded record PWMthr; recent months: ACIS, station USW00014764. Records and recent months use complete months only.
How does July in Portland compare across Maine?
Across the 42 places PlainClimate covers in Maine, July normal highs run from 75°F in Limestone to 82°F in Fryeburg; Portland's is 80°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.