Anchorage weather by month
Anchorage runs from about -11°C in January to 15°C in July, with August the wettest month at 163 mm.
warmest month
July
15°C
coolest month
January
-11°C
wettest month
August
163 mm
worst air month
January
8 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | -11°C | 44 mm | 98 h | 8 |
| February | -7°C | 46 mm | 133 h | 6 |
| March | -3°C | 41 mm | 158 h | 7 |
| April | 1°C | 22 mm | 282 h | 6 |
| May | 7°C | 48 mm | 280 h | 3 |
| June | 14°C | 35 mm | 391 h | 4 |
| July | 15°C | 108 mm | 268 h | 6 |
| August | 13°C | 163 mm | 230 h | 5 |
| September | 9°C | 144 mm | 175 h | 4 |
| October | 2°C | 80 mm | 171 h | 3 |
| November | -6°C | 36 mm | 92 h | 5 |
| December | -4°C | 53 mm | 34 h | 7 |
About 2,312 hours of sun a year. Roughly 82 rainy days a year.
These are long-run climate normals, not a forecast. A given year can sit well outside them. PM2.5 is a global model: near the coast it counts sea salt as fine particulate and reads high against ground stations, sometimes by a factor of two. Use the shape of the year, not the absolute number.
where these numbers come from
- · Temperature, rainfall and sunshine: ECMWF ERA5 reanalysis climate normals via Open-Meteo (CC BY 4.0), fetched once and stored.
- · PM2.5: Copernicus CAMS reanalysis, monthly means. Modelled, not station readings; near coasts CAMS counts sea salt as PM2.5 and reads high.
Last reviewed 2026-05-24. Full method, licences and the list of sources we rejected are on the methodology page.