Iliamna weather in May: Iliamna, Alaska: normal highs, lows, rain and records for May
Iliamna in May has a normal high of 55°F and a normal low of 38°F, a daily mean of 46°F, rising from 51°F on the 1st to 58°F by the 31st. Measurable precipitation falls on 9 days in a normal May, 1.19 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 13°C and low of 3°C, 30 mm of precipitation in May.
- NOAA stationIliamna Airport
- Station IDUSW00025506
- Location59.75°N 154.91°W
- Elevation143 ft (44 m)
- Population (census place)45
- Jan 25° 12°
- Feb 30° 16°
- Mar 32° 16°
- Apr 43° 29°
- May 55° 38°
- Jun 62° 45°
- Jul 65° 51°
- Aug 64° 50°
- Sep 56° 43°
- Oct 45° 32°
- Nov 33° 21°
- Dec 28° 15°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Iliamna in May?
The normal high is 55°F and the normal low 38°F, for a daily mean of 46.3°F. May is 10.2°F warmer than April and 7.4°F cooler than June. May is the 5th warmest month of the year in Iliamna and the 8th wettest. Across the month the normal high rises 7°F, from 51°F on May 1 to 58°F on May 31. From one year to the next May's mean temperature typically moves about 2.1°F either way (NOAA's standard deviation), so roughly two Mays in three average between 44°F and 48°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 31%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| May 1 | 51°F | 36°F | 27% | 11% |
| May 8 | 53°F | 37°F | 28% | 11% |
| May 15 | 55°F | 38°F | 29% | 12% |
| May 22 | 56°F | 39°F | 29% | 12% |
| May 31 | 58°F | 41°F | 31% | 13% |
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 | 51°F | 36°F | 27% | 11% | 15 h 50 min |
| May 2 | 51°F | 36°F | 27% | 11% | 16 h |
| May 3 | 51°F | 36°F | 27% | 11% | 16 h |
| May 4 | 52°F | 36°F | 28% | 11% | 16 h 10 min |
| May 5 | 52°F | 36°F | 28% | 11% | 16 h 10 min |
| May 6 | 52°F | 37°F | 28% | 11% | 16 h 20 min |
| May 7 | 53°F | 37°F | 28% | 11% | 16 h 20 min |
| May 8 | 53°F | 37°F | 28% | 11% | 16 h 30 min |
| May 9 | 53°F | 37°F | 28% | 11% | 16 h 30 min |
| May 10 | 53°F | 37°F | 28% | 11% | 16 h 40 min |
| May 11 | 54°F | 37°F | 28% | 11% | 16 h 40 min |
| May 12 | 54°F | 37°F | 28% | 12% | 16 h 50 min |
| May 13 | 54°F | 37°F | 28% | 12% | 16 h 50 min |
| May 14 | 54°F | 38°F | 29% | 12% | 17 h |
| May 15 | 55°F | 38°F | 29% | 12% | 17 h |
| May 16 | 55°F | 38°F | 29% | 12% | 17 h 10 min |
| May 17 | 55°F | 38°F | 29% | 12% | 17 h 10 min |
| May 18 | 55°F | 38°F | 29% | 12% | 17 h 10 min |
| May 19 | 56°F | 38°F | 29% | 12% | 17 h 20 min |
| May 20 | 56°F | 38°F | 29% | 12% | 17 h 20 min |
| May 21 | 56°F | 38°F | 29% | 12% | 17 h 30 min |
| May 22 | 56°F | 39°F | 29% | 12% | 17 h 30 min |
| May 23 | 56°F | 39°F | 30% | 12% | 17 h 40 min |
| May 24 | 57°F | 39°F | 30% | 12% | 17 h 40 min |
| May 25 | 57°F | 39°F | 30% | 12% | 17 h 40 min |
| May 26 | 57°F | 39°F | 30% | 12% | 17 h 50 min |
| May 27 | 57°F | 40°F | 30% | 12% | 17 h 50 min |
| May 28 | 58°F | 40°F | 30% | 13% | 18 h |
| May 29 | 58°F | 40°F | 30% | 13% | 18 h |
| May 30 | 58°F | 40°F | 30% | 13% | 18 h |
| May 31 | 58°F | 41°F | 31% | 13% | 18 h 10 min |
- Normal high
- 55°FMay average
- Normal low
- 38°FMay average
- Precipitation
- 1.19 inmonth total
- Days with precipitation
- 90.01 inch or more
- Nights at 32°F or colder
- 6
- Daylight
- 15 h 50 min to 18 h 10 minMay 1 to May 31
- Days at 70°F or more
- 1
- Sunshine
- 64%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00025506; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Iliamna in May?
On a given May day the chance of 0.01 inch or more is 29% on average, highest around May 31 (31%). In all, 1.19 in falls on 9 days of a normal May.
In a normal May in Iliamna, 6 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00025506.
How humid and windy is Iliamna in May?
At 3 p.m. the normal temperature is 55°F with 54% relative humidity and a dew point of 39°F; at 6 a.m. it is 44°F with 81% humidity. The wind averages 8.8 mph, most often from the southeast in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 44°F | 38°F | 81% | 6.6 mph | – |
| 9 a.m. | 49°F | 39°F | 68% | 8.1 mph | 33% |
| noon | 53°F | 39°F | 59% | 10.8 mph | 39% |
| 3 p.m. | 55°F | 39°F | 54% | 12.2 mph | 34% |
| 6 p.m. | 55°F | 38°F | 54% | 11.5 mph | 39% |
| 9 p.m. | 51°F | 39°F | 64% | 8.4 mph | 39% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00025506. 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 Iliamna?
The warmest May temperature on this station's record (since 1920) is 80°F, on May 26, 2006; the coldest is 4°F, on May 4, 1949. The wettest May brought 4.06 in (1985); the snowiest, 12.6 inches (1964).
The May mean against the 1991-2020 normal of 46.3°F: 2021 44.0°F (−2.3), 2022 46.8°F (+0.5), 2023 42.2°F (−4.1), 2024 37.1°F (−9.2), 2025 44.8°F (−1.5), 2026 40.9°F (−5.4). 1 of 6 ran warmer than normal.
| May | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 44.0°F | −2.3°F | 0.57 in |
| 2022 | 46.8°F | +0.5°F | 0.15 in |
| 2023 | 42.2°F | −4.1°F | 0.73 in |
| 2024 | 37.1°F | −9.2°F | 0.94 in |
| 2025 | 44.8°F | −1.5°F | 1.36 in |
| 2026 | 40.9°F | −5.4°F | 2.13 in |
Source: records: ACIS, station USW00025506; recent months: ACIS, station USW00025506. Records and recent months use complete months only.
How does May in Iliamna compare across Alaska?
Across the 85 places PlainClimate covers in Alaska, May normal highs run from 27°F in Utqiaġvik to 65°F in Two Rivers; Iliamna's is 55°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.