Gilroy in Spring
In spring (March, April and May), Gilroy sees average daytime highs around 67°F and overnight lows near 47°F, with 4.2 in of rain over about 15 wet days across the season. It is the 3rd-warmest season and the 2nd-wettest season.
Over the season highs climb from about 61°F in early March to 72°F by late May. The sky is clear or mostly clear about 48% of the time across spring, and the air most often feels dry.
Spring is Gilroy's 3rd-best season to visit on our travel score. For the whole year in context, see Gilroy's year-round climate.
- Avg daytime high
- 67°F
- 3rd-warmest season
- Avg overnight low
- 47°F
- Rainfall
- 4.2 in
- 15 wet days
- Avg wind
- 4 mph
- Travel score
- 7.1
- 3rd-best season
- Months
- Mar · Apr · May
Temperature in Gilroy in Spring
Over the season highs climb from about 61°F in early March to 72°F by late May.
A typical spring day in Gilroy reaches about 67°F and drops to 47°F overnight. The warmest of the three months is May, the coolest March.
Gilroy weather by month
How the three spring months (March, April and May) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 58° / 41° | 3.4 | 8.3 | 9.7 | 4.6 |
| Feb | 60° / 43° | 3.4 | 8.5 | 10.6 | 5.0 |
| Mar | 63° / 45° | 2.5 | 8 | 11.7 | 6.0 |
| Apr | 66° / 47° | 1.1 | 4.6 | 12.9 | 7.1 |
| May | 70° / 50° | 0.5 | 2.8 | 14 | 8.1 |
| Jun | 75° / 53° | 0.1 | 0.6 | 14.5 | 9.2 |
| Jul | 79° / 57° | 0.0 | 0.2 | 14.3 | 9.2 |
| Aug | 79° / 57° | 0.0 | 0.1 | 13.4 | 9.2 |
| Sep | 78° / 56° | 0.1 | 0.4 | 12.3 | 9.2 |
| Oct | 73° / 51° | 0.7 | 1.9 | 11 | 8.7 |
| Nov | 64° / 45° | 1.4 | 4.7 | 10 | 6.7 |
| Dec | 58° / 40° | 3.0 | 7.7 | 9.5 | 4.6 |
Cloud cover in Spring
The sky is clear or mostly clear about 48% of the time across spring.
Chance of precipitation in Spring
Gilroy gets around 4.2 in of rain over 15 wet days across spring. The line is the day-by-day chance of measurable precipitation.
Humidity in Spring
Most of spring feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Spring
Winds average 4 mph across spring.
Sunrise & sunset in Spring
Daylight runs from about 11 h 06 min in early March to 14 h 18 min by late May. The lit band spans sunrise to sunset each day.
Solar energy in Spring
Average shortwave solar energy reaching the ground each day across spring, about 6.1 kWh/m².
Is spring a good time to visit Gilroy?
Our two travel scores rate spring for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
spring is one of the better times to visit Gilroy for general sightseeing.
What to pack for Gilroy in Spring
From spring's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In spring, Gilroy sees daytime highs around 67°F and nights near 47°F. Pack sun protection. Worth having: a warm layer and rain gear. About 15 days see rain.
Sea temperature near Gilroy in Spring
The nearest coast averages about 54°F across spring — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 19 mi away) is warmest in September at about 58°F and coldest in April near 54°F.
The water stays below 68°F all year — cool enough that most swimmers want a wetsuit.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 55 | 55 | 55 | 54 | 54 | 55 | 57 | 58 | 58 | 58 | 56 | 55 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 55 | Bracing |
| Feb | 55 | Bracing |
| Mar | 55 | Bracing |
| Apr | 54 | Bracing |
| May | 54 | Bracing |
| Jun | 55 | Bracing |
| Jul | 57 | Bracing |
| Aug | 58 | Bracing |
| Sep | 58 | Bracing |
| Oct | 58 | Bracing |
| Nov | 56 | Bracing |
| Dec | 55 | Bracing |
UV index in Gilroy in Spring
Clear-sky midday UV across spring averages around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Gilroy peaks around June 22 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 14 at about 2 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 3 | 4 | 4 | 7 | 8 | 11 | 10 | 10 | 7 | 5 | 2 | 2 |
| Level | Moderate | Moderate | Moderate | High | Very high | Extreme | Extreme | Very high | High | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 3 | Moderate |
| Feb | 4 | Moderate |
| Mar | 4 | Moderate |
| Apr | 7 | High |
| May | 8 | Very high |
| Jun | 11 | Extreme |
| Jul | 10 | Extreme |
| Aug | 10 | Very high |
| Sep | 7 | High |
| Oct | 5 | High |
| Nov | 2 | Moderate |
| Dec | 2 | Moderate |
Air quality in Gilroy in Spring
Average fine-particle pollution (PM2.5) through the year — so you can see where spring falls, not just the annual average.
Air quality in Gilroy is worst in August — around 22 µg/m³ PM2.5 (moderate), about 4.2× the cleanest month (June, 5 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 7 | 8 | 8 | 7 | 6 | 5 | 8 | 22 | 15 | 12 | 8 | 7 |
| Level | Good | Good | Good | Good | Good | Good | Good | Moderate | Moderate | Moderate | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 7 | Good |
| Feb | 8 | Good |
| Mar | 8 | Good |
| Apr | 7 | Good |
| May | 6 | Good |
| Jun | 5 | Good |
| Jul | 8 | Good |
| Aug | 22 | Moderate |
| Sep | 15 | Moderate |
| Oct | 12 | Moderate |
| Nov | 8 | Good |
| Dec | 7 | Good |
Where is Gilroy?
Gilroy sits at 37.0°N, 121.6°W, 200 ft above sea level, in United States. The nearest listed city is Morgan Hill, 9.9 mi away.
Topography around Gilroy
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Gilroy.
Within 2 miles, the terrain around Gilroy has only modest variations in elevation — a maximum elevation change of 640 ft around an average of 217 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,871 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 5,161 ft.
The land around Gilroy is covered by artificial surfaces (49%) and cropland (25%) within 2 miles, trees (38%) and grassland (36%) within 10 miles, and grassland (39%) and trees (27%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Gilroy (37.0058°, -121.5683°, elevation 200 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.