September is the hottest month for Castro Valley with an average high temperature of 77.3°, which ranks it as cooler than most places in California. In Castro Valley, there are 6 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Castro Valley are September, August and July.

July is the hottest month for San Carlos with an average high temperature of 80.4°, which ranks it as cooler than most places in California. In San Carlos, there are 6 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for San Carlos are June, September and August.

January has the coldest nighttime temperatures for Castro Valley with an average of 41.6°. This is warmer than most places in California.

December has the coldest nighttime temperatures for San Carlos with an average of 38.5°. This is about average compared to other places in California.

In Castro Valley, there are 12.0 days annually when the high temperature is over 90°, which is cooler than most places in California.

In San Carlos, there are 22.9 days annually when the high temperature is over 90°, which is cooler than most places in California.

In Castro Valley, there are 3.7 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.

In San Carlos, there are 15.2 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in California.

In Castro Valley, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in California.

In San Carlos, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in California.

February is the wettest month in Castro Valley with 4.0 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 55% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 21.3 inches in Castro Valley means that it is wetter than most places in California.


February is the wettest month in San Carlos with 5.3 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 58% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 26.8 inches in San Carlos means that it is wetter than most places in California.

December is the rainiest month in Castro Valley with 11.6 days of rain, and July is the driest month with only 0.1 rainy days. There are 66.0 rainy days annually in Castro Valley, which is rainier than most places in California. The rainiest season is Spring when it rains 51% of the time and the driest is Autumn with only a 2% chance of a rainy day.

January is the rainiest month in San Carlos with 11.0 days of rain, and July is the driest month with only 0.9 rainy days. There are 70.1 rainy days annually in San Carlos, which is rainier than most places in California. The rainiest season is Spring when it rains 46% of the time and the driest is Autumn with only a 5% chance of a rainy day.

There is rarely any recorded snowfall in Castro Valley, ranking it as one of the least snowy places in California.

There is rarely any recorded snowfall in San Carlos, ranking it as one of the least snowy places in California.

Any measurable snowfall is a rare occurance in Castro Valley.

Any measurable snowfall is a rare occurance in San Carlos.

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