Climate Insights for Shasta Lake

The climate in Shasta Lake is temperate. The average annual temperature is 16°C and approximately 1505mm of precipitation falls per year. January is the wettest month, receiving around 304mm of rainfall. Shasta Lake is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, June. The coldest months are February, December, January, when temperatures can drop to 4°C. Snowfall occurs from January to December, with around 78cm accumulating over the season.

Temperatures in Shasta Lake vary considerably across the year, with a 33°C difference between the coldest and warmest months. July is the hottest month, with daytime highs reaching 37°C and an average of 29°C. February is the coolest month, with minimum temperatures around 4°C and an average of 8°C. On average, daily temperatures fluctuate by about 14°C between overnight lows and afternoon highs. The sharpest temperature change occurs between September and October, with a 6°C shift in average temperatures.

Shasta Lake is a fairly wet location, receiving approximately 1505mm of precipitation annually, which averages out to around 125mm per month. The wettest month is January, averaging 304mm of rainfall. December and March also tend to see above-average precipitation. The driest month is July, with just 0mm. That's 304mm less than January, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic. Snowfall is a regular feature from January to December, with around 78cm accumulating over the season. March typically sees the most snow at around 21cm.

Shasta Lake is relatively calm, with an average annual wind speed of 7km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 8km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 6km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 2km/h between the calmest and windiest months.

It is currently summer in Shasta Lake, which began on June 21, 2026. Shasta Lake is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in July at around 37°C, while the coldest stretch bottoms out in February near 4°C. Autumn is next, beginning on September 23, 2026 (7 days from now).

The best time to visit Shasta Lake is during May, June, September and October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 21°C with modest rainfall averaging 43mm per month. By contrast, July can be uncomfortably hot with highs reaching 37°C, while February is the coldest period with lows dropping to 4°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Shasta Lake based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.