Pomona, CA Weather by Month and Climate Averages

How much rain does Pomona get?

Pomona gets 10.0 in of precipitation in an average year, spread over about 34 days with measurable rain. That is fewer rainy days than 91% of the US.

February is the wettest month, with 2.7 in. August is the driest, with 0.0 in. February has the most rainy days, about 6.

The longest dry spell in the last five years lasted 193 days, to November 14, 2024.

See where Pomona ranks: rainiest cities in the US, US cities with the most rainy days, rainiest cities in California.

Pomona weather by month

Pomona weather in January

In January, Pomona averages a high of 69°F and a low of 40°F. It gets 2.2 in of precipitation over about 5 rainy days. The sun is out about 54% of daylight hours. The January record high is 93°F (2021) and the record low is 20°F (2007). January is one of the most comfortable months to visit.

Pomona weather in February

In February, Pomona averages a high of 69°F and a low of 41°F. It gets 2.7 in of precipitation over about 6 rainy days. The sun is out about 61% of daylight hours. The February record high is 95°F (2016) and the record low is 27°F (2002).

Pomona weather in March

In March, Pomona averages a high of 72°F and a low of 44°F. It gets 1.4 in of precipitation over about 5 rainy days. The sun is out about 50% of daylight hours. The March record high is 100°F (2026) and the record low is 28°F (2002). March is one of the most comfortable months to visit.

Pomona weather in April

In April, Pomona averages a high of 76°F and a low of 47°F. It gets 0.6 in of precipitation over about 4 rainy days. The sun is out about 60% of daylight hours. The April record high is 106°F (2004) and the record low is 31°F (1999). April is one of the most comfortable months to visit.

Pomona weather in May

In May, Pomona averages a high of 80°F and a low of 53°F. It gets 0.2 in of precipitation over about 1 rainy days. The sun is out about 65% of daylight hours. The May record high is 104°F (2025) and the record low is 39°F (2003).

Pomona weather in June

In June, Pomona averages a high of 87°F and a low of 57°F. It gets 0.0 in of precipitation over about 0 rainy days. The sun is out about 73% of daylight hours. The June record high is 115°F (2016) and the record low is 45°F (1999).

Pomona weather in July

In July, Pomona averages a high of 94°F and a low of 61°F. It gets 0.1 in of precipitation over about 0 rainy days. The sun is out about 84% of daylight hours. The July record high is 120°F (2018) and the record low is 50°F (2004).

Pomona weather in August

In August, Pomona averages a high of 95°F and a low of 61°F. It gets 0.0 in of precipitation over about 0 rainy days. The sun is out about 83% of daylight hours. The August record high is 115°F (2017) and the record low is 51°F (1999).

Pomona weather in September

In September, Pomona averages a high of 92°F and a low of 58°F. It gets 0.1 in of precipitation over about 1 rainy days. The sun is out about 79% of daylight hours. The September record high is 121°F (2020) and the record low is 47°F (2000).

Pomona weather in October

In October, Pomona averages a high of 84°F and a low of 52°F. It gets 0.5 in of precipitation over about 3 rainy days. The sun is out about 75% of daylight hours. The October record high is 111°F (2020) and the record low is 33°F (2009).

Pomona weather in November

In November, Pomona averages a high of 76°F and a low of 44°F. It gets 0.6 in of precipitation over about 4 rainy days. The sun is out about 69% of daylight hours. The November record high is 100°F (2010) and the record low is 27°F (2000). November is one of the most comfortable months to visit.

Pomona weather in December

In December, Pomona averages a high of 68°F and a low of 39°F. It gets 1.7 in of precipitation over about 5 rainy days. The sun is out about 51% of daylight hours. The December record high is 92°F (2021) and the record low is 23°F (1998). December is one of the most comfortable months to visit.

Sunshine, humidity and wind in Pomona

July is the sunniest month in Pomona, with sunshine about 84% of daylight hours. March is the cloudiest, at 50%. Over the year the sun shines about 67% of daylight hours. Pomona is sunnier than 94% of the US.

Humidity peaks in May at 63% and is lowest in November at 37%.

Wind averages 5 mph over the year, and May is the windiest month at 7 mph.

Pomona has about 99 days a year above 90°F. Pomona is hotter than 92% of the US.

Thunderstorms occur on about 6 days a year.

See where Pomona ranks: sunniest cities in the US, cloudiest cities in the US, hottest cities in the US.

First and last freeze in Pomona

The first fall freeze in Pomona typically comes around December 7, and the last spring freeze around February 16. That leaves a frost-free growing season of about 294 days.

Pomona weather records

The hottest temperature on record at the Pomona station is 121°F, on September 6, 2020. The coldest is 20°F, on January 14, 2007.

The wettest day on record brought 3.5 in of rain, on February 5, 2024.

The best time to visit Pomona

The most comfortable time to visit is typically January, March to April, and November to December, when daytime highs sit near 72°F.

Winter (December–February) is warm, with average highs around 69°F and lows near 40°F.

Spring (March–May) is warm, with average highs around 76°F and lows near 48°F.

Summer (June–August) is hot, with average highs around 92°F and lows near 60°F.

Autumn (September–November) is hot, with average highs around 84°F and lows near 51°F.

Pomona climate questions

How much rain does Pomona get?

Pomona gets 10.0 in of precipitation in an average year, over about 34 rainy days.

What is the wettest month in Pomona?

February is the wettest month in Pomona, with 2.7 in. August is the driest, with 0.0 in.

How many rainy days does Pomona have a year?

Pomona has about 34 days with measurable rain in an average year. February has the most, about 6.

What is the hottest month in Pomona?

August is the warmest month in Pomona, with an average high of 95°F.

What is the coldest month in Pomona?

December is the coldest month in Pomona, with an average low of 39°F.

What is the record high temperature in Pomona?

The record high at the Pomona station is 121°F, set on September 6, 2020. The record low is 20°F, on January 14, 2007.

What is the sunniest month in Pomona?

July is the sunniest month in Pomona, with sunshine about 84% of daylight hours. March is the cloudiest.

When is the first frost in Pomona?

The first fall freeze in Pomona typically comes around December 7. The last spring freeze is around February 16.

What is the best time to visit Pomona?

The most comfortable time to visit is typically January, March to April, and November to December, when daytime highs sit near 72°F.