Monthly weather forecast and climate
Irwindale, CA

Weather in January

January, like December, in Irwindale, California, is another enjoyable winter month, with temperature in the range of an average high of 64.9°F (18.3°C) and an average low of 48.4°F (9.1°C). In Irwindale, California, the average high-temperature in January is relatively 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 Irwindale, is another comfortable month, with temperature in the range of an average high of 64.8°F (18.2°C) and an average low of 47.3°F (8.5°C). In February, the average high-temperature is almost the same as in January - a still enjoyable 64.8°F (18.2°C). Weather in February »

Weather in March

March, the first month of the spring, in Irwindale, is still a comfortable month, with average temperature varying between 67.8°F (19.9°C) and 48.6°F (9.2°C). In Irwindale, the average high-temperature is almost the same as in February - a still enjoyable 67.8°F (19.9°C). Weather in March »

Weather in April

April in Irwindale, California, is an agreeable spring month, with temperature in the range of an average high of 71.6°F (22°C) and an average low of 51.3°F (10.7°C). In April, the average high-temperature is essentially the same as in March - a pleasant 71.6°F (22°C). Weather in April »

Weather in May

May, the last month of the spring, in Irwindale, is a warm month, with temperature in the range of an average high of 74.7°F (23.7°C) and an average low of 54°F (12.2°C). In May, the average high-temperature is relatively the same as in April - a moderately hot 74.7°F (23.7°C). Weather in May »

Weather in June

June, the first month of the summer, in Irwindale, is also a moderately hot month, with temperature in the range of an average high of 80.2°F (26.8°C) and an average low of 57.7°F (14.3°C). In June, the average high-temperature marginally rises, from 74.7°F (23.7°C) in May, to a still warm 80.2°F (26.8°C). Weather in June »

Weather in July

July, the same as June, is a moderately hot summer month in Irwindale, California, with average temperature varying between 85.6°F (29.8°C) and 63.5°F (17.5°C). In July, the average high-temperature marginally rises, from 80.2°F (26.8°C) in June, to a still moderately hot 85.6°F (29.8°C). Weather in July »

Weather in August

August, the last month of the summer, in Irwindale, is a hot month, with temperature in the range of an average low of 64.9°F (18.3°C) and an average high of 87.1°F (30.6°C). August is the warmest month, with an average high-temperature of 87.1°F (30.6°C) and an average low-temperature of 64.9°F (18.3°C). In August, the average heat index is estimated at a tropical 88.9°F (31.6°C). Weather in August »

Weather in September

September, the first month of the autumn, in Irwindale, is also a moderately hot month, with temperature in the range of an average high of 85.3°F (29.6°C) and an average low of 63.5°F (17.5°C). In September, the average high-temperature is essentially the same as in August - a warm 85.3°F (29.6°C). Weather in September »

Weather in October

October, the same as September, is a moderately hot autumn month in Irwindale, California, with temperature in the range of an average high of 78.3°F (25.7°C) and an average low of 58.5°F (14.7°C). In October, the average high-temperature marginally drops, from 85.3°F (29.6°C) in September, to a still moderately hot 78.3°F (25.7°C). Weather in October »

Weather in November

The last month of the autumn, November, is another pleasant month in Irwindale, California, with average temperature ranging between min 52.9°F (11.6°C) and max 70.7°F (21.5°C). In November, the average high-temperature marginally drops, from a moderately hot 78.3°F (25.7°C) in October, to an agreeable 70.7°F (21.5°C). Weather in November »

Weather in December

December, the first month of the winter, in Irwindale, is also an enjoyable month, with temperature in the range of an average high of 63.1°F (17.3°C) and an average low of 47.3°F (8.5°C). With an average high-temperature of 63.1°F (17.3°C) and an average low-temperature of 47.3°F (8.5°C), December is the coldest month. Weather in December »
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FAQ

How much does it rain in Irwindale?

In Irwindale, California, during the entire year, the rain falls for 49.6 days and collects up to 8.11" (206mm) of precipitation.

How many days does it snow in Irwindale?

Throughout the year, in Irwindale, there are 0.1 snowfall days.

When it does not snow in Irwindale?

January through November are months without snowfall.

What is the month with the least sunshine in Irwindale?

January, February and December, with an average of 6.9h of sunshine, are months with the least sunshine.

When is the lowest UV index in Irwindale?

Months with the lowest UV index in Irwindale, California, are January through March, November and December, with an average maximum UV index of 4.

What is the wettest month in Irwindale?

February is the month with the most rainfall in Irwindale. Rain falls for 5.8 days and accumulates 1.73" (44mm) of precipitation.

What are the most humid months in Irwindale?

Months with the highest humidity in Irwindale, California, are May and June, with an average relative humidity of 57%.

What is the driest month in Irwindale?

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

When are the longest days in Irwindale?

With an average of 14.4h of daylight, June has the longest days of the year in Irwindale, California.

What are the months with the highest UV index in Irwindale?

Months with the highest UV index in Irwindale are June through September, with an average maximum UV index of 6.

What month has the most sunshine in Irwindale?

With an average of 12.1h of sunshine, July has the most sunshine of the year in Irwindale, California.

What is the warmest month in Irwindale?

August is the warmest month in Irwindale, with an average high-temperature of 87.1°F (30.6°C) and an average low-temperature of 64.9°F (18.3°C).

What is the least humid month in Irwindale?

November is the least humid month in Irwindale, California, with an average relative humidity of 46%.

What is the coldest month in Irwindale?

December is the coldest month in Irwindale, California, with an average high-temperature of 63.1°F (17.3°C) and an average low-temperature of 47.3°F (8.5°C).

When does it snow in Irwindale?

December is the only month when snow falls.

What is the snowiest month in Irwindale?

The month with the most snowfall days in Irwindale, California, is December when snow falls for 0.1 days.

What is the month with the shortest days in Irwindale?

The month with the shortest days in Irwindale is December, with an average of 9.9h of daylight.

Average temperature
Irwindale, CA

Average temperature - Irwindale, CA

The warmest month (with the highest average high temperature) is August (87.1°F).
The month with the lowest average high temperature is December (63.1°F).

The month with the highest average low temperature is August (64.9°F).
The coldest months (with the lowest average low temperature) are February and December (47.3°F).

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Average pressure
Irwindale, CA

Average pressure - Irwindale, CA

The month with the highest atmospheric pressure is January (30.1").
The month with the lowest atmospheric pressure is June (29.88").

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Average wind speed
Irwindale, CA

Average wind speed - Irwindale, 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 (4.4mph).

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Average humidity
Irwindale, CA

Average humidity - Irwindale, CA

Months with the highest relative humidity are May and June (57%).
The month with the lowest relative humidity is November (46%).

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Average rainfall
Irwindale, CA

Average rainfall - Irwindale, CA

The wettest month (with the highest rainfall) is February (1.73").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days
Irwindale, CA

Average rainfall days - Irwindale, CA

The month with the highest number of rainy days is March (6.5 days).
The month with the least rainy days is June (1.2 days).

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Average snowfall days
Irwindale, CA

Average snowfall days - Irwindale, CA

The month with the highest number of snowfall days is December (0.1 days).
Months with the least snowfall days are January, February, March, April, May, June, July, August, September, October and November (0 days).

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Average daylight / Average sunshine
Irwindale, CA

Average daylight / Average sunshine - Irwindale, 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).

The month with the most sunshine is July (Average sunshine: 12.1h).
Months with the least sunshine are January, February and December (Average sunshine: 6.9).

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Average sunshine days
Irwindale, CA

Average sunshine days - Irwindale, CA

The month with the most sunshine days is June (28.3 days).
The month with the least sunshine days is February (21.5 days).

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Average UV index
Irwindale, CA

Average UV index - Irwindale, CA

Months with the highest UV index are June, July, August and September (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 4).

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Average visibility
Irwindale, CA

Average visibility - Irwindale, 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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