Alton Weather Forecast
- 45
- 62
Partly Sunny
- 49
- 67
Mostly Sunny
- 49
- 74
Mostly Sunny
- 48
- 66
Mostly Cloudy
- 52
- 66
Mostly Cloudy
- 48
- 61
Rain
- 48
- 59
Rain
Today 19 Oct Northern Humboldt Coast
Mostly cloudy until early afternoon then becoming mostly sunny. Patchy dense fog in the morning. Chance of rain in the morning. Highs 57 to 67. East wind around 5 Mph shifting to the north 5 to 15 Mph in the afternoon.
Tonight 19 Oct Northern Humboldt Coast
Partly cloudy. Patchy dense fog. Lows 40 to 50. North wind up to 10 Mph.
Alton Temperature Statistics
October Temperature
Fortuna Rohnerville Airport (0.6 miles)
Lowest 14 October, 2025
41 °FAverage October
54.9 °FHighest 6 October, 2025
82.4 °F
Climate (2020–Present)
Fortuna Rohnerville Airport (0.6 miles)
Average Low 2020–2025
45.1 °FAverage 2020–2025
51.2 °FAverage High 2020–2025
59.5 °F