Photo: Beeblebrox · CC BY-SA 4.0Hardly any U.S. towns see fresher July days than Nikiski
On a normal January night the air cools to about 7°. Winter nights are cold: in January they are colder than in 96% of U.S. towns. The gap between a January night and a July afternoon is 56°. The heating season runs September to May: each of those months averages under 50°.
A year in Nikiski at a glance
Each month’s typical high and low, and what it brings.
What stands out about Nikiski’s climate
Compared with towns across the U.S., with Nikiski’s place in Alaska beside it.
What a year in Nikiski feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 125 frost-free days a year
In half of years the last 32° night comes by May 18 and the first by September 22. Frost and day counts come from NOAA’s station at Kenai 9n, AK, 5 miles from the town’s center, at about the same height.
The 2023 USDA map puts Nikiski’s center in zone 5a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −18°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
About 18 inches of rain a year
September is the wettest month and April the driest.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Nikiski
Nearly all of the work is heating: a normal year has almost no cooling days. Months averaging under 55°: every month but July.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Kenai 9n, AK.
Living with Nikiski’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
125 frost-free days in zone 5a. The last frost comes by May 18 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Sep 22.
Months with highs of 62–84° and lows of 40° or more: July and August. 6.0 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Nikiski from natural hazards, earthquakes are the largest share (51%). Normals are averages; the hazards page covers the extremes.
Natural hazards →Nikiski and its neighbors
Point Possession has the coldest January nights next door (3°, 5° colder) and Point Possession the hottest July afternoons (67°, 4° warmer). Differences under a degree are within what the 5 km grid can tell apart. Tap a town to see its climate.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
How Nikiski compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Nikiski’s place among Alaska’s.
Nikiski weather by month
Highs, lows and precipitation from the nearest NOAA station. 1991–2020 normals.
| Month | High | Low | Rain + melt |
|---|---|---|---|
| January | 22° | 7° | 0.9" |
| February | 28° | 12° | 0.8" |
| March | 33° | 14° | 0.6" |
| April | 44° | 28° | 0.6" |
| May | 55° | 36° | 0.8" |
| June | 60° | 44° | 1.2" |
| July | 63° | 49° | 2.0" |
| August | 63° | 47° | 2.7" |
| September | 56° | 40° | 3.6" |
| October | 43° | 29° | 2.6" |
| November | 30° | 16° | 1.4" |
| December | 25° | 11° | 1.1" |
| Year | 44° | 28° | 18.3" |
Where Nikiski’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s 1991–2020 normals at the nearest station (NOAA’s grid doesn’t cover Alaska).
- Frost, freezing nights, 90° and 100° days, heating and cooling: Kenai 9n, AK, 5 miles from the town’s center, at about the same height; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Nikiski’s climate
What is the weather like in Nikiski?
A typical July afternoon reaches 63°, a January night drops to 7°. Colder January nights than 96% of U.S. towns; cooler July afternoons than all but 12 U.S. towns.
How cold does it get in Nikiski in winter?
January nights average 7°. About 209 nights a year reach 32° or below and 42 reach 0° or below.
How hot does it get in Nikiski?
July, with a typical high of 63°. 90° days are rare: none in a normal year at Kenai 9n, AK.
When is the first and last frost in Nikiski?
In half of years the last spring frost (32°) comes by May 18 and the first fall frost by September 22, about 125 frost-free days, at Kenai 9n, AK.
What growing zone is Nikiski in?
Zone 5a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −18°.
What is the best time of year to visit Nikiski?
By one simple rule (highs of 62–84° and lows of 40° or more), July and August. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Neighbors talk weather
Gardens, snow, and the best days of the year in Nikiski.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.