San Bernardino in Winter
In winter (June, July and August), San Bernardino sees average daytime highs around 24°C and overnight lows near 14°C, with 249 mm of rain over about 23 wet days across the season. It is the coldest season of the year and the driest season of the year.
Over the season highs climb from about 23°C in early June to 27°C by late August. The sky is clear or mostly clear about 49% of the time across winter, and the air most often feels dry.
Winter is San Bernardino's best season of the year to visit on our travel score. For the whole year in context, see San Bernardino's year-round climate.
- Avg daytime high
- 24°C
- coldest season of the year
- Avg overnight low
- 14°C
- Rainfall
- 249 mm
- 23 wet days
- Avg wind
- 13 km/h
- Travel score
- 7.4
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in San Bernardino in Winter
Over the season highs climb from about 23°C in early June to 27°C by late August.
A typical winter day in San Bernardino reaches about 24°C and drops to 14°C overnight. The warmest of the three months is August, the coolest July.
How winter really feels in San Bernardino
Once humidity and wind are folded in, winter brings about 0 days that feel above 32°C and 0 that feel at or below 0°C.
winter sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
San Bernardino weather by month
How the three winter months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 33° / 23° | 124 | 12.9 | 13.4 | 3.5 |
| Feb | 32° / 23° | 142 | 12.3 | 12.9 | 3.7 |
| Mar | 31° / 22° | 109 | 10.3 | 12.2 | 4.6 |
| Apr | 28° / 19° | 142 | 8.9 | 11.4 | 6.2 |
| May | 24° / 16° | 130 | 8.8 | 10.8 | 7.2 |
| Jun | 23° / 14° | 97 | 8.3 | 10.5 | 7.1 |
| Jul | 23° / 13° | 82 | 7.7 | 10.6 | 7.4 |
| Aug | 26° / 15° | 70 | 6.6 | 11.1 | 7.7 |
| Sep | 27° / 16° | 113 | 8.6 | 11.8 | 6.9 |
| Oct | 29° / 19° | 196 | 12.1 | 12.6 | 5.3 |
| Nov | 30° / 20° | 177 | 11.1 | 13.2 | 4.8 |
| Dec | 32° / 22° | 163 | 12.7 | 13.5 | 3.9 |
Cloud cover in Winter
The sky is clear or mostly clear about 49% of the time across winter.
Chance of precipitation in Winter
San Bernardino gets around 249 mm of rain over 23 wet days across winter. The line is the day-by-day chance of measurable precipitation.
Humidity in Winter
Most of winter feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Winter
Winds average 13 km/h across winter.
Sunrise & sunset in Winter
Daylight runs from about 10 h 30 min in early June to 11 h 30 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Winter
Average shortwave solar energy reaching the ground each day across winter, about 3.3 kWh/m².
Is winter a good time to visit San Bernardino?
Our two travel scores rate winter for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
winter is one of the better times to visit San Bernardino for general sightseeing. The water and warmth also suit a beach or pool day.
What to pack for San Bernardino in Winter
From winter's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In winter, San Bernardino sees daytime highs around 24°C and nights near 14°C. Worth packing: light clothes and rain gear. About 23 days see rain.
UV index in San Bernardino in Winter
Clear-sky midday UV across winter averages around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in San Bernardino peaks around January 17 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 15 at about 5 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 15 | 14 | 11 | 9 | 6 | 5 | 5 | 5 | 8 | 8 | 12 | 13 |
| Level | Extreme | Extreme | Extreme | Very high | High | Moderate | Moderate | High | Very high | Very high | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 15 | Extreme |
| Feb | 14 | Extreme |
| Mar | 11 | Extreme |
| Apr | 9 | Very high |
| May | 6 | High |
| Jun | 5 | Moderate |
| Jul | 5 | Moderate |
| Aug | 5 | High |
| Sep | 8 | Very high |
| Oct | 8 | Very high |
| Nov | 12 | Extreme |
| Dec | 13 | Extreme |
Air quality in San Bernardino in Winter
Average fine-particle pollution (PM2.5) through the year — so you can see where winter falls, not just the annual average.
Air quality in San Bernardino is worst in September — around 28 µg/m³ PM2.5 (moderate), about 2.9× the cleanest month (December, 10 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) | 11 | 12 | 11 | 13 | 13 | 15 | 17 | 25 | 28 | 18 | 13 | 10 |
| Level | Good | Moderate | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 11 | Good |
| Feb | 12 | Moderate |
| Mar | 11 | Good |
| Apr | 13 | Moderate |
| May | 13 | Moderate |
| Jun | 15 | Moderate |
| Jul | 17 | Moderate |
| Aug | 25 | Moderate |
| Sep | 28 | Moderate |
| Oct | 18 | Moderate |
| Nov | 13 | Moderate |
| Dec | 10 | Good |
Where is San Bernardino?
San Bernardino sits at 25.3°S, 57.3°W, 0 m above sea level, in Paraguay. The nearest listed city is Areguá, 9.0 km away.
Topography around San Bernardino
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of San Bernardino.
Within 3 km, the terrain around San Bernardino has only modest variations in elevation — a maximum elevation change of 183 m around an average of 91 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 272 m; within 80 km, significant variations in elevation — a maximum elevation change of 529 m.
The land around San Bernardino is covered by trees (51%) and water (42%) within 3 km, trees (72%) within 16 km, and grassland (52%) and trees (39%) within 80 km.
Paraguay travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type A / B / C / N
- 220 V · 50 Hz
- Prices
- ≈ 35% of US
- price level, 2025
- GDP per capita
- $7,027
- 2025
- Happiness
- 6.2 / 10
- World Happiness, 2025
- Safe drinking water
- 64%
- of population, 2024
- Homicide rate
- 6.8
- per 100k, 2023
- Road deaths
- 22
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Moderate
- EF EPI 531
- 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 San Bernardino (-25.3107°, -57.2963°, elevation 0 m), 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.