Monthly weather forecast and climate
San Dimas, CA

Weather in January

January, the same as December, is another enjoyable winter month in San Dimas, California, with average temperature ranging between min 46.9°F (8.3°C) and max 64.9°F (18.3°C). In San Dimas, the average high-temperature in January is practically the same as in December - a still comfortable 64.9°F (18.3°C). Weather in January »

Weather in February

February, the last month of the winter, in San Dimas, is another comfortable month, with temperature in the range of an average high of 64.4°F (18°C) and an average low of 45.7°F (7.6°C). In February, the average high-temperature is practically the same as in January - a still enjoyable 64.4°F (18°C). Weather in February »

Weather in March

March, the first month of the spring, in San Dimas, is an agreeable month, with temperature in the range of an average high of 68.2°F (20.1°C) and an average low of 47.5°F (8.6°C). In March, the average high-temperature is essentially the same as in February - an agreeable 68.2°F (20.1°C). Weather in March »

Weather in April

April, the same as March, in San Dimas, California, is another pleasant spring month, with average temperature ranging between min 50.2°F (10.1°C) and max 72.3°F (22.4°C). In San Dimas, the average high-temperature in April is relatively the same as in March - a still agreeable 72.3°F (22.4°C). Weather in April »

Weather in May

May, the last month of the spring, in San Dimas, is a warm month, with temperature in the range of an average high of 75.7°F (24.3°C) and an average low of 54°F (12.2°C). In May, the average high-temperature is essentially the same as in April - a warm 75.7°F (24.3°C). Weather in May »

Weather in June

June, the first month of the summer, in San Dimas, is still a warm month, with average temperature varying between 82.9°F (28.3°C) and 57.7°F (14.3°C). In San Dimas, California, the average high-temperature marginally rises, from a moderately hot 75.7°F (24.3°C) in May, to a still warm 82.9°F (28.3°C). Weather in June »

Weather in July

July is a tropical summer month in San Dimas, California, with average temperature varying between 88.2°F (31.2°C) and 63.3°F (17.4°C). In July, the average high-temperature is almost the same as in June - a tropical 88.2°F (31.2°C). Weather in July »

Weather in August

The last month of the summer, August, is also a hot month in San Dimas, California, with average temperature fluctuating between 64.9°F (18.3°C) and 89.4°F (31.9°C). With an average high-temperature of 89.4°F (31.9°C) and an average low-temperature of 64.9°F (18.3°C), August is the warmest month. In August, the average heat index is evaluated at a hot 91.6°F (33.1°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a tropical month in San Dimas, California, with average temperature fluctuating between 86.7°F (30.4°C) and 63.3°F (17.4°C). In San Dimas, California, the average high-temperature is almost the same as in August - a still tropical 86.7°F (30.4°C). Weather in September »

Weather in October

October, the same as September, is another warm autumn month in San Dimas, California, with average temperature varying between 78.3°F (25.7°C) and 58.1°F (14.5°C). In October, the average high-temperature slightly decreases, from a hot 86.7°F (30.4°C) in September, to a moderately hot 78.3°F (25.7°C). Weather in October »

Weather in November

November, the last month of the autumn, in San Dimas, is also an agreeable month, with temperature in the range of an average low of 51.8°F (11°C) and an average high of 70.7°F (21.5°C). In November, the average high-temperature marginally drops, from a warm 78.3°F (25.7°C) in October, to an agreeable 70.7°F (21.5°C). Weather in November »

Weather in December

The first month of the winter, December, is also an enjoyable month in San Dimas, California, with average temperature fluctuating between 62.4°F (16.9°C) and 45.5°F (7.5°C). December is the coldest month, with an average high-temperature of 62.4°F (16.9°C) and an average low-temperature of 45.5°F (7.5°C). Weather in December »
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FAQ

How much does it rain in San Dimas?

In San Dimas, California, during the entire year, the rain falls for 45.2 days and collects up to 6.5" (165mm) of precipitation.

What is the month with the least sunshine in San Dimas?

January, February and December, with an average of 7h of sunshine, are months with the least sunshine in San Dimas.

What is the rainiest month in San Dimas?

The month with the most rainfall in San Dimas is February when the rain falls for 5 days and typically aggregates up to 1.46" (37mm) of precipitation.

What are the most humid months in San Dimas?

Months with the highest humidity in San Dimas are March and May, with an average relative humidity of 55%.

What is the driest month in San Dimas?

June is the month with the least rainfall. Rain falls for 1.2 days and accumulates 0.04" (1mm) of precipitation.

When are the longest days in San Dimas?

The month with the longest days in San Dimas is June, with an average of 14.4h of daylight.

What are the months with the most sunshine in San Dimas?

Months with the most sunshine in San Dimas, California, are June and July, with an average of 12.1h of sunshine.

What is the month with the highest UV index in San Dimas?

July and August, with an average maximum UV index of 7, are months with the highest UV index in San Dimas.

What is the warmest month in San Dimas?

The warmest month in San Dimas is August, with an average high-temperature of 89.4°F (31.9°C) and an average low-temperature of 64.9°F (18.3°C).

What is the least humid month in San Dimas?

August and November, with an average relative humidity of 45%, are the least humid months in San Dimas, California.

What is the coldest month in San Dimas?

December is the coldest month in San Dimas, California, with an average high-temperature of 62.4°F (16.9°C) and an average low-temperature of 45.5°F (7.5°C).

What is the month with the shortest days in San Dimas?

December has the shortest days of the year in San Dimas, California, with an average of 9.9h of daylight.

When is the lowest UV index in San Dimas?

The month with the lowest UV index is December, with an average maximum UV index of 3.

Average temperature
San Dimas, CA

Average temperature - San Dimas, CA

The warmest month (with the highest average high temperature) is August (89.4°F).
The month with the lowest average high temperature is December (62.4°F).

The month with the highest average low temperature is August (64.9°F).
The coldest month (with the lowest average low temperature) is December (45.5°F).

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Average pressure
San Dimas, CA

Average pressure - San Dimas, CA

The month with the highest atmospheric pressure is January (30.1").
The month with the lowest atmospheric pressure is June (29.87").

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Average wind speed
San Dimas, CA

Average wind speed - San Dimas, CA

The windiest months (with the highest average wind speed) are April and May (5.7mph).
The calmest month (with the lowest average wind speed) is September (4.3mph).

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Average humidity
San Dimas, CA

Average humidity - San Dimas, CA

Months with the highest relative humidity are March and May (55%).
Months with the lowest relative humidity are August and November (45%).

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Average rainfall
San Dimas, CA

Average rainfall - San Dimas, CA

The wettest month (with the highest rainfall) is February (1.46").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days
San Dimas, CA

Average rainfall days - San Dimas, CA

The month with the highest number of rainy days is March (6.3 days).
The month with the least rainy days is June (1.2 days).

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Average daylight / Average sunshine
San Dimas, CA

Average daylight / Average sunshine - San Dimas, CA

The month with the longest days is June (Average daylight: 14.4h).
The month with the shortest days is December (Average daylight: 9.9h).

Months with the most sunshine are June and July (Average sunshine: 12.1h).
Months with the least sunshine are January, February and December (Average sunshine: 7).

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Average sunshine days
San Dimas, CA

Average sunshine days - San Dimas, CA

The month with the most sunshine days is June (27.8 days).
The month with the least sunshine days is February (22 days).

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Average visibility
San Dimas, CA

Average visibility - San Dimas, CA

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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