Climate and monthly weather forecastSan Anselmo, CA

The climate of San Anselmo

San Anselmo, California is located in a climate zone identified as Csb by the Köppen climate classification system. This indicates a Mediterranean climate with warm summer conditions. The geographical position of San Anselmo results in mostly mild and pleasant weather throughout the year.

The temperature averages from a minimum 45.5°F (7.5°C) to a maximum of 72.3°F (22.4°C). Fluctuations in temperature are moderate, allowing for comfortable living conditions for inhabitants and visitors alike. Relative humidity levels range from a low of 68% to a high of 77%. The presence of humidity infuses the air with moisture, contributing to the overall temperate climate.

Rainfall in San Anselmo varies throughout the year, with the maximum amount recorded as 0.87" (22mm) and minimum as 0.04" (1mm). The number of days with rainfall ranges between 1.2 days to 8.8 days a month, indicating periodic bouts of rain amidst clear skies. Months with maximum rainfall appear to coincide with cooler temperatures, giving San Anselmo a distinctive rainy season in the cooler months.

The best time to visit San Anselmo

The ideal time for visiting San Anselmo depends on the personal preference of the visitor. However, considering the climatic conditions, the period from May to September could be the most suitable. This time frame witnesses the highest temperatures, with averages from 62.8°F (17.1°C) to 72.3°F (22.4°C), offering warm and pleasant conditions. Rainfall is sparse, ranging between 0.04" (1mm) to 0.28" (7mm), and the average daylight hours are between 13.2 hours to 14.8 hours.

The worst time to visit San Anselmo

Conversely, the months from November to February would perhaps be least favorable for visiting San Anselmo. The lower temperatures averaging between 55.4°F (13°C) to 59.4°F (15.2°C) combined with increased rainfall ranging from 0.47" (12mm) to 0.87" (22mm) and lower daylight hours from 9.6 hours to 10.8 hours could potentially dampen the visitor experience.

Spring weather in San Anselmo

The Spring season in San Anselmo ensures a transition from the relatively cooler winter season to a warmer summer. During this phase, there is an upswing in temperatures, with average highs ranging from 59.4°F (15.2°C) to 69.1°F (20.6°C) and lows from 46.9°F (8.3°C) to 53.2°F (11.8°C). Rainfall is lower than winter with an average between 0.59" (15mm) to 0.2" (5mm). The hours of daylight also increase, offering visitors an extended time to explore the city's attractions.

Summer weather in San Anselmo

Summers prevail from June to August in San Anselmo marking the warmest period of the year. High temperatures range from 69.1°F (20.6°C) to 72.3°F (22.4°C) while lower temperatures vary between 53.2°F (11.8°C) to 56.1°F (13.4°C). Rainfall is the lowest during this period with an average of 0.04" (1mm), providing nice and dry weather conditions. This is also the period with extended daylight hours, soaring between 14.5 hours to 14.8 hours, allowing maximum time for outdoor activities.

Autumn weather in San Anselmo

Autumn marks the transition from the warm summers to the somewhat cooler winters. High temperatures range from 61.5°F (16.4°C) to 72.3°F (22.4°C) while lows fluctuate between 49.6°F (9.8°C) to 56.1°F (13.4°C). Rainfall begins to pick up post summer, with averages between 0.04" (1mm) to 0.47" (12mm), signalling the onset of the rainy season. The daylight hours gradually decrease from 12.4 hours to 10.1 hours as the season progresses.

Winter weather in San Anselmo

Winter months in San Anselmo introduce cooler weather compared to the rest of the year. The temperature highs range from 55.4°F (13°C) to 56.1°F (13.4°C) with lows between 45.3°F (7.4°C) to 45.5°F (7.5°C). The rainfall increases, leading to an average between 0.59" (15mm) to 0.87" (22mm), marking the peak of the rainy season. Reduced daylight hours, from 9.6 hours to 9.9 hours, combined with increased cloud cover, contribute to the overall winter ambiance in the city.

Weather in January

Starting the year, January sees one of the lowest average temperatures in San Anselmo, California, with minimums hovering at 45.5°F (7.5°C) and highs reaching 56.1°F (13.4°C). The combination of humidity at 74% and significant cloud coverage of 36% makes for quite overcast conditions. Weather in January »

Weather in February

Moving into February, San Anselmo experiences a slight ascend in temperatures and rainfall, peaking at 57.9°F (14.4°C) and 0.87" (22mm), respectively. Intervals of cloudiness exist due to a 34% cloud cover, while daylight extends by almost an hour compared to January. Weather in February »

Weather in March

March heralds the onset of Spring, noticing a marginal rise in temperatures to a balmy average of 59.4°F (15.2°C). Despite an increase in daylight to 12 hours, the cloud cover intensifies to 39%, resulting in slightly overcast days. Weather in March »

Weather in April

April in San Anselmo testifies to a considerable leap in temperatures reaching 62.8°F (17.1°C), signifying a clear progression towards summer. The lengthening of days ushers in more sunshine hours. The city witnesses the commencement of the dry spell with the average rain tapering down to 0.2" (5mm). Weather in April »

Weather in May

In May, San Anselmo enters the realm of summer temperatures as highs ascend to 64.9°F (18.3°C). With 14.2 daylight hours, it beholds sun-soaked afternoons. Rainfall further reduces to 0.28" (7mm), continuing the characteristic dryness of California's summer months. Weather in May »

Weather in June

June witnesses a visible shift in San Anselmo weather as the average high soars to a balmy 69.1°F (20.6°C). The length of the day and the sunlight exposure reach their zenith making it the best time for outdoor activities. Despite this, the rainfall is at a minimal 0.04" (1mm). Weather in June »

Weather in July

July brings the peak of summer to San Anselmo, with temperature highs averaging 70.5°F (21.4°C). There's an ample amount of sunlight and long days that lull into beautiful Californian summer nights. Nevertheless, it sees a slight pullback in daylight hours from the previous month. Weather in July »

Weather in August

In August, San Anselmo endures its warmest month with maximum temperatures reaching 71.2°F (21.8°C). The high heat comes with noticeable humidity of 76%. The long sunshine hours bode well for outdoor enthusiasts, despite a restraining reduction in daylight hours. Weather in August »

Weather in September

As September arrives, San Anselmo gets a respite from the peak summer heat as temperature highs decline to 72.3°F (22.4°C). It ushers in slightly cooler days and nights, painting a pleasant climate canvas. This is accompanied by the least cloud cover observed in the year at 19%, making for clear sky days. Weather in September »

Weather in October

October represents the start of cooling trends in San Anselmo as temperatures settle to a comfortable 68.9°F (20.5°C). The shorter daylight hours and reduced sunshine mark the advent of fall. Despite this, October sees a slight increase in rainfall to 0.12" (3mm), evidencing the season change. Weather in October »

Weather in November

In November, temperatures in San Anselmo take a more substantial dip, averaging 61.5°F (16.4°C), indicating the onset of colder months. The fall season is in full mode, translating into shorter days and reduced sunshine. The city experiences a palpable increase in rainfall to 0.47" (12mm), as winter draws nearer. Weather in November »

Weather in December

December marks the year-end with the lowest temperatures in San Anselmo, descending to an average low of 45.3°F (7.4°C). The darkness sets in early, and the city gets limited hours of sunshine. Interestingly, the amount of rainfall spikes to 0.67" (17mm), making it the month with the most precipitation. Weather in December »