Gilroy weather by month

Warmest month

August

76°F (24°C) average high

Coolest month

December

44°F (6°C) average low

Wettest month

December

2.9 in (74 mm) of rain

Driest month

July

0 in (0 mm) of rain

Average temperature and rainfall in Gilroy by month

Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.

Month	Avg high	Avg low	Record low / high	Rainfall	Humidity	Wind
January	62°F	44°F	30°F / 79°F	2 in	78%	7 mph
February	63°F	44°F	35°F / 81°F	2.1 in	74%	7 mph
March	64°F	46°F	35°F / 80°F	2 in	75%	8 mph
April	65°F	48°F	41°F / 83°F	1.1 in	73%	8 mph
May	67°F	51°F	42°F / 86°F	0.6 in	74%	8 mph
June	70°F	53°F	46°F / 88°F	0.3 in	75%	8 mph
July	74°F	56°F	47°F / 88°F	0 in	75%	8 mph
August	76°F	57°F	51°F / 94°F	0 in	76%	7 mph
September	75°F	56°F	48°F / 95°F	0.3 in	74%	7 mph
October	75°F	53°F	46°F / 94°F	0.9 in	70%	6 mph
November	67°F	47°F	36°F / 82°F	1.4 in	71%	6 mph
December	61°F	44°F	23°F / 74°F	2.9 in	75%	8 mph

Frost and snow-likely months in Gilroy

No month in Gilroy averages a night of 36°F (2°C) or below. The coldest month is December with an average low of 44°F (6°C) and a record low of 23°F (-5°C), so frost is rare and snow is very unlikely.

These records carry temperature and precipitation, not snowfall totals.

Best time to visit Gilroy

The most comfortable time to visit Gilroy is generally July to September, balancing mild daytime temperatures against the driest stretch of the year. The city has a moderate seasonal swing and rain concentrates around December, totalling about 13.7 in (349 mm) a year.

Travellers who prefer heat should aim for August, when highs average 76°F (24°C). December is the month to avoid if rain would spoil your plans — it averages 2.9 in (74 mm), roughly 74× the rainfall of the driest month (July).

Gilroy climate: your questions

Does it snow in Gilroy?

No: the coldest month in Gilroy is December with an average low of 44°F (6°C) and a record low of 23°F (-5°C), so snow is very unlikely. What is falling now: Gilroy weather today.

Which months are best for visiting Gilroy?

July to September are the most comfortable months in Gilroy, with highs near 75°F (24°C). August is the warmest month, averaging 76°F (24°C) by day; December is the wettest, with 2.9 in (74 mm); and December is the coolest, with lows near 44°F (6°C). What it is doing today: Gilroy weather today.

Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Gilroy forecast for what is happening now.