Los Alamos Weather in September
What's the weather like in Los Alamos (New Mexico) in September 2025?
The climate in Los Alamos during September can be summarized as mild and reasonably dry.
September is in the fall / autumn in Los Alamos and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 24°C (74°F), whilst at night 8°C (46°F) is normal.
| Daytime temperature | 23.5°C 74.2°F |
|---|---|
| Nightly temperature | 7.6°C 45.6°F |
| Average temperature | 15.5°C 59.9°F |
| Daily sunshine | 10 hrs |
| Avg rainfall | 39 mm 1.5 ins |
| Rainy days | 7 days |
| Sea temperature | 20.2°C 68.4°F |
| Humidity | 48% |
| Windspeed | 15.1kph 9 mph |
On average September is the 3rd wettest month of the year in Los Alamos with around 39mm 1.5 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 7 days, although this may vary considerably.
On the flip side this corresponds to an average of 10 hours of sunshine per day.
September temperatures in Los Alamos
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Los Alamos in September 2025.
Other monthly averages
Best places to visit in September
Los Alamos weather stats
| Hottest month: | July | 28.7°C 83.7°F |
|---|---|---|
| Driest month: | April | 22mm 0.9ins |
| Sunniest month: | June | 12.3hrs |
| Coldest month: | January | 5.3°C 41.5°F |
| Wettest month: | August | 71mm 2.8ins |
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