Altoona weather in May: Altoona, Pennsylvania: normal highs, lows, rain and records for May
Altoona in May has a normal high of 71°F and a normal low of 50°F, a daily mean of 60°F, rising from 67°F on the 1st to 74°F by the 31st. Measurable precipitation falls on 14 days in a normal May, 3.72 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 22°C and low of 10°C, 94 mm of precipitation in May.
- NOAA stationAltoona Blair County Airport
- Station IDUSW00014736
- Location40.30°N 78.32°W
- Elevation1,480 ft (451 m)
- From the center15 miles
- Population42,719
- Jan 36° 21°
- Feb 39° 23°
- Mar 48° 30°
- Apr 61° 40°
- May 71° 50°
- Jun 79° 58°
- Jul 83° 62°
- Aug 81° 60°
- Sep 74° 53°
- Oct 63° 43°
- Nov 51° 34°
- Dec 40° 26°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Altoona in May?
The normal high is 71°F and the normal low 50°F, for a daily mean of 60.3°F. May is 9.9°F warmer than April and 8.2°F cooler than June. May is the 5th warmest month of the year in Altoona and the 2nd wettest. Across the month the normal high rises 7°F, from 67°F on May 1 to 74°F on May 31. From one year to the next May's mean temperature typically moves about 3.6°F either way (NOAA's standard deviation), so roughly two Mays in three average between 57°F and 64°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 44%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| May 1 | 67°F | 45°F | 44% | 26% |
| May 8 | 69°F | 47°F | 44% | 27% |
| May 15 | 71°F | 49°F | 44% | 27% |
| May 22 | 72°F | 52°F | 43% | 26% |
| May 31 | 74°F | 54°F | 42% | 26% |
Every day of May: normal high, low and chance of precipitation (warmest afternoon May 31, coldest night May 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| May 1 | 67°F | 45°F | 44% | 26% | 13 h 50 min |
| May 2 | 67°F | 45°F | 44% | 26% | 14 h |
| May 3 | 68°F | 46°F | 44% | 26% | 14 h |
| May 4 | 68°F | 46°F | 44% | 27% | 14 h |
| May 5 | 68°F | 46°F | 44% | 27% | 14 h |
| May 6 | 69°F | 47°F | 44% | 27% | 14 h |
| May 7 | 69°F | 47°F | 44% | 27% | 14 h 10 min |
| May 8 | 69°F | 47°F | 44% | 27% | 14 h 10 min |
| May 9 | 69°F | 48°F | 44% | 27% | 14 h 10 min |
| May 10 | 70°F | 48°F | 44% | 27% | 14 h 10 min |
| May 11 | 70°F | 48°F | 44% | 27% | 14 h 10 min |
| May 12 | 70°F | 49°F | 44% | 27% | 14 h 20 min |
| May 13 | 70°F | 49°F | 44% | 27% | 14 h 20 min |
| May 14 | 71°F | 49°F | 44% | 27% | 14 h 20 min |
| May 15 | 71°F | 49°F | 44% | 27% | 14 h 20 min |
| May 16 | 71°F | 50°F | 44% | 27% | 14 h 20 min |
| May 17 | 71°F | 50°F | 44% | 27% | 14 h 30 min |
| May 18 | 71°F | 50°F | 44% | 27% | 14 h 30 min |
| May 19 | 72°F | 51°F | 44% | 26% | 14 h 30 min |
| May 20 | 72°F | 51°F | 44% | 26% | 14 h 30 min |
| May 21 | 72°F | 51°F | 43% | 26% | 14 h 30 min |
| May 22 | 72°F | 52°F | 43% | 26% | 14 h 40 min |
| May 23 | 73°F | 52°F | 43% | 26% | 14 h 40 min |
| May 24 | 73°F | 52°F | 43% | 26% | 14 h 40 min |
| May 25 | 73°F | 53°F | 43% | 26% | 14 h 40 min |
| May 26 | 73°F | 53°F | 43% | 26% | 14 h 40 min |
| May 27 | 73°F | 53°F | 43% | 26% | 14 h 40 min |
| May 28 | 74°F | 53°F | 43% | 26% | 14 h 40 min |
| May 29 | 74°F | 54°F | 43% | 26% | 14 h 50 min |
| May 30 | 74°F | 54°F | 42% | 26% | 14 h 50 min |
| May 31 | 74°F | 54°F | 42% | 26% | 14 h 50 min |
- Normal high
- 71°FMay average
- Normal low
- 50°FMay average
- Precipitation
- 3.72 inmonth total
- Days with precipitation
- 140.01 inch or more
- Nights at 32°F or colder
- 1
- Daylight
- 13 h 50 min to 14 h 50 minMay 1 to May 31
- Days at 70°F or more
- 17
- Days at 80°F or more
- 7
- Sunshine
- 67%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014736; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Altoona in May?
On a given May day the chance of 0.01 inch or more is 44% on average, highest around May 11 (44%). In all, 3.72 in falls on 14 days of a normal May, 1 of them with an inch or more.
In a normal May in Altoona, 1 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014736.
How humid and windy is Altoona in May?
At 3 p.m. the normal temperature is 72°F with 53% relative humidity and a dew point of 54°F; at 6 a.m. it is 58°F with 86% humidity. The wind averages 6.4 mph, most often from the west in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 58°F | 53°F | 86% | 3.8 mph | 50% |
| 9 a.m. | 65°F | 54°F | 68% | 7.1 mph | 49% |
| noon | 70°F | 54°F | 56% | 9.1 mph | 40% |
| 3 p.m. | 72°F | 54°F | 53% | 9.8 mph | 39% |
| 6 p.m. | 70°F | 54°F | 58% | 8.5 mph | 46% |
| 9 p.m. | 63°F | 54°F | 73% | 5.2 mph | 61% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00014736. 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 May in Altoona?
The warmest May temperature on this station's record (since 1948) is 94°F, on May 29, 1969; the coldest is 25°F, on May 11, 1966. The wettest May brought 7.34 in (2025).
The May mean against the 1991-2020 normal of 60.3°F: 2021 58.6°F (−1.7), 2022 61.7°F (+1.4), 2023 58.5°F (−1.8), 2024 63.8°F (+3.5), 2025 60.2°F (−0.1), 2026 57.9°F (−2.4). 2 of 6 ran warmer than normal.
| May | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 58.6°F | −1.7°F | 4.62 in |
| 2022 | 61.7°F | +1.4°F | 5.25 in |
| 2023 | 58.5°F | −1.8°F | 1.09 in |
| 2024 | 63.8°F | +3.5°F | 5.41 in |
| 2025 | 60.2°F | −0.1°F | 7.34 in |
| 2026 | 57.9°F | −2.4°F | 3.88 in |
Source: records: ACIS, station USW00014736; recent months: ACIS, station USW00014736. Records and recent months use complete months only.
How does May in Altoona compare across Pennsylvania?
Across the 108 places PlainClimate covers in Pennsylvania, May normal highs run from 65°F in Laporte to 75°F in Phoenixville; Altoona's is 71°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.