Best time to visit Gilroy
The best time to visit Gilroy is April–November, judged on twenty years of weather records and the events worth going for.
Gilroy, California, United States
°C
mm
- Average daily high and low
- Precipitation
- Good month
- Best month
- Made good or best by an event
| Month | Average daily high | Average daily low | Precipitation | Verdict |
|---|---|---|---|---|
| January | 15 °C / 59 °F | 5.2 °C / 41 °F | 83 mm / 3.3 in | good month |
| February | 16.1 °C / 61 °F | 5.7 °C / 42 °F | 70 mm / 2.8 in | good month |
| March | 17.2 °C / 63 °F | 7 °C / 45 °F | 64 mm / 2.5 in | good month |
| April | 19.1 °C / 66 °F | 8.4 °C / 47 °F | 27 mm / 1.1 in | best month |
| May | 21.1 °C / 70 °F | 10.3 °C / 51 °F | 11 mm / 0.4 in | best month |
| June | 24.1 °C / 75 °F | 12.3 °C / 54 °F | 2 mm / 0.1 in | best month |
| July | 25.8 °C / 78 °F | 13.9 °C / 57 °F | 1 mm / 0 in | best month |
| August | 26 °C / 79 °F | 14.3 °C / 58 °F | 0 mm / 0 in | best month |
| September | 25.6 °C / 78 °F | 13.7 °C / 57 °F | 2 mm / 0.1 in | best month |
| October | 22.9 °C / 73 °F | 10.8 °C / 51 °F | 19 mm / 0.8 in | best month |
| November | 18.2 °C / 65 °F | 6.9 °C / 44 °F | 36 mm / 1.4 in | best month |
| December | 14.5 °C / 58 °F | 4.9 °C / 41 °F | 75 mm / 3 in | good month |
Good and best months depend on more than temperature, rain and events. How they are chosen
Each activity on this page has its own good and best months, rated on twenty years of daily weather records. Which measures count, and how much, depends on the activity: humidity for exploring outdoors, wind for the beach, hiking and skiing, snow for skiing alone. Between them, the activities are rated on:
- Daytime highs
- Night-time lows
- How warm it feels
- Humidity
- How much of the day is sunny
- Hours of daylight
- Monthly rainfall
- How many days it rains
- Days of heavy rain
- Wind
- Snowfall and days with snow
- Major events, such as festivals
The chart shows the good and best months for exploring outdoors.
The event icon marks a month that an event lifts to good or best, such as a festival or a natural spectacle. Choose “Weather only” in the toolbar to rate the months on weather alone.
Best months by activity
Exploring outdoors
Mild days and nights, mostly dry and bright. The default for 'when should I go'.
- JJanuary: good
- FFebruary: good
- MMarch: good
- AApril: best
- MMay: best
- JJune: best
- JJuly: best
- AAugust: best
- SSeptember: best
- OOctober: best
- NNovember: best
- DDecember: good
- Best
- April–November
- Good
- December–March
Why these months
January · good
In its favour: share of daylight that is sunny 80%, precipitation 83 mm / 3.3 in, feels like (high) 13.1 °C / 56 °F, average daily high 15 °C / 59 °F, wet days 7 days, days with heavy rain 2.8 days, average daily low 5.2 °C / 41 °F, relative humidity 75%.
February · good
In its favour: share of daylight that is sunny 84%, feels like (high) 14.1 °C / 57 °F, precipitation 70 mm / 2.8 in, average daily high 16.1 °C / 61 °F, wet days 7.1 days, days with heavy rain 2.6 days, relative humidity 72%, average daily low 5.7 °C / 42 °F.
March · good
In its favour: feels like (high) 15.8 °C / 60 °F, share of daylight that is sunny 84%, precipitation 64 mm / 2.5 in, average daily high 17.2 °C / 63 °F, wet days 8.4 days, days with heavy rain 2.4 days, average daily low 7 °C / 45 °F, relative humidity 72%.
April · best
In its favour: feels like (high) 18.4 °C / 65 °F, average daily high 19.1 °C / 66 °F, precipitation 27 mm / 1.1 in, share of daylight that is sunny 88%, wet days 4.3 days, days with heavy rain 0.7 days, average daily low 8.4 °C / 47 °F, relative humidity 70%.
May · best
In its favour: feels like (high) 21 °C / 70 °F, average daily high 21.1 °C / 70 °F, precipitation 11 mm / 0.4 in, share of daylight that is sunny 93%, wet days 2.1 days, days with heavy rain 0.2 days, average daily low 10.3 °C / 51 °F, relative humidity 68%.
June · best
In its favour: feels like (high) 25 °C / 77 °F, average daily high 24.1 °C / 75 °F, precipitation 2 mm / 0.1 in, share of daylight that is sunny 94%, wet days 0.3 days, days with heavy rain 0.1 days, average daily low 12.3 °C / 54 °F, relative humidity 66%.
July · best
In its favour: feels like (high) 27.4 °C / 81 °F, average daily high 25.8 °C / 78 °F, precipitation 1 mm / 0 in, share of daylight that is sunny 95%, wet days 0.2 days, days with heavy rain 0 days, average daily low 13.9 °C / 57 °F, relative humidity 66%.
August · best
In its favour: feels like (high) 27.6 °C / 82 °F, average daily high 26 °C / 79 °F, precipitation 0 mm / 0 in, share of daylight that is sunny 96%, wet days 0 days, days with heavy rain 0 days, average daily low 14.3 °C / 58 °F, relative humidity 68%.
September · best
In its favour: feels like (high) 26.3 °C / 79 °F, average daily high 25.6 °C / 78 °F, precipitation 2 mm / 0.1 in, share of daylight that is sunny 95%, wet days 0.6 days, days with heavy rain 0 days, average daily low 13.7 °C / 57 °F, relative humidity 67%.
October · best
In its favour: feels like (high) 22.2 °C / 72 °F, average daily high 22.9 °C / 73 °F, precipitation 19 mm / 0.8 in, share of daylight that is sunny 91%, wet days 2 days, days with heavy rain 0.5 days, average daily low 10.8 °C / 51 °F, relative humidity 66%.
November · best
In its favour: feels like (high) 16.6 °C / 62 °F, average daily high 18.2 °C / 65 °F, precipitation 36 mm / 1.4 in, share of daylight that is sunny 87%, wet days 4.6 days, days with heavy rain 1 days, relative humidity 70%, average daily low 6.9 °C / 44 °F.
December · good
In its favour: share of daylight that is sunny 79%, precipitation 75 mm / 3 in, feels like (high) 12.6 °C / 55 °F, average daily high 14.5 °C / 58 °F, wet days 7.7 days, days with heavy rain 2.5 days, average daily low 4.9 °C / 41 °F, relative humidity 75%.
An activity is listed only where it applies: skiing at ski destinations, beach and swimming at beach destinations. The nearest ski area is Dodge Ridge Ski Area, 195 km away.
Weather averages
Monthly averages over twenty years, 2006–2025. Highs, lows and precipitation are in the chart at the top.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels like (high) | 13.1 °C | 14.1 °C | 15.8 °C | 18.4 °C | 21 °C | 25 °C | 27.4 °C | 27.6 °C | 26.3 °C | 22.2 °C | 16.6 °C | 12.6 °C |
| Days with heavy rain | 2.8 days | 2.6 days | 2.4 days | 0.7 days | 0.2 days | 0.1 days | 0 days | 0 days | 0 days | 0.5 days | 1 days | 2.5 days |
| Time rain usually falls | 5 pm | 4 pm | 4 pm | 2 pm | 3 pm | 6 am | 12 pm | 12 pm | 3 pm | 6 pm | 2 pm | 7 pm |
| Sunshine per day | 7.9 h | 9.1 h | 10.1 h | 11.5 h | 13.2 h | 13.7 h | 13.8 h | 12.9 h | 11.8 h | 10.3 h | 8.9 h | 7.6 h |
| Relative humidity | 75% | 72% | 72% | 70% | 68% | 66% | 66% | 68% | 67% | 66% | 70% | 75% |
Air quality
Averaged over a shorter period (2022–2025) than the twenty-year averages above, and not counted towards good or best months.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Air pollution (PM2.5) 2022–2025 | 7.1 µg/m³ | 7.5 µg/m³ | 7.4 µg/m³ | 8.7 µg/m³ | 7.3 µg/m³ | 7.6 µg/m³ | 7.9 µg/m³ | 7.7 µg/m³ | 8 µg/m³ | 8.4 µg/m³ | 8.4 µg/m³ | 9.5 µg/m³ |
| Air pollution (PM2.5, daily peak) 2022–2025 | 11.8 µg/m³ | 12.7 µg/m³ | 12.5 µg/m³ | 13.7 µg/m³ | 10.3 µg/m³ | 9.9 µg/m³ | 10.7 µg/m³ | 10.3 µg/m³ | 11.8 µg/m³ | 13.6 µg/m³ | 13.4 µg/m³ | 15.2 µg/m³ |
- Good 15 µg/m³ or less
- Fair 15 to 25 µg/m³
- Moderate 25 to 37.5 µg/m³
- Poor 37.5 to 50 µg/m³
- Very poor 50 to 75 µg/m³
- Extremely poor over 75 µg/m³
Each figure is compared with the World Health Organization's guideline for a day's air, 15 µg/m³ or less, and with its interim targets above that. The words are ours: the WHO does not name its steps. The figures are modelled monthly averages, so single days can be well above them. The daily peak is the average of each day's highest hour, shaded on the same scale.