Climate averages 1991–2020
Guildford weather
in September.
A mild, moderately wet month: the 4th warmest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Guildford: daytime highs average 18.5°C and nights cool to about 11.0°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 49 mm of rain on roughly 9 days, which makes September a moderately wet month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 42 min on an average September day.
The nearest other city in this atlas is Woking (9 km away). In September its highs average 18.5°C, about as warm as Guildford, with 49 mm of rain.
Among the 143 cities listed in the United Kingdom, Guildford ranks joint 7th of 143 for the warmest September highs and joint 20th of 143 for the driest September (rainfall, lowest first). The mean September high of those 143 cities is 17.3°C; Guildford is 1.2°C warmer than that mean.
From September to October, average highs fall by 3.9°C to 14.6°C, and monthly rainfall rises from 49 mm to 62 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Guildford climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.5°C2.4°C | 2.4°C | 58 | 10.8 | 8.48 h |
| February | 7.9°C2.1°C | 2.1°C | 47 | 9.3 | 10.010 h |
| March | 10.4°C3.3°C | 3.3°C | 44 | 10.0 | 11.812 h |
| April | 13.3°C5.0°C | 5.0°C | 52 | 11.3 | 13.814 h |
| May | 16.4°C8.1°C | 8.1°C | 55 | 10.1 | 15.516 h |
| June | 19.3°C11.1°C | 11.1°C | 57 | 9.7 | 16.516 h |
| July | 21.4°C13.2°C | 13.2°C | 57 | 10.4 | 16.116 h |
| August | 21.1°C13.2°C | 13.2°C | 64 | 10.0 | 14.615 h |
| September, selected | 18.5°C11.0°C | 11.0°C | 49 | 9.2 | 12.713 h |
| October | 14.6°C8.4°C | 8.4°C | 62 | 10.8 | 10.711 h |
| November | 10.5°C5.1°C | 5.1°C | 66 | 11.5 | 9.09 h |
| December | 7.8°C2.9°C | 2.9°C | 62 | 10.9 | 8.08 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Woking in SeptemberUnited Kingdom · 9 kmHigh 18.5°C · Low 10.9°C · 49 mm rain
- Bracknell in SeptemberUnited Kingdom · 23 kmHigh 18.1°C · Low 10.6°C · 49 mm rain
- Sutton in SeptemberUnited Kingdom · 29 kmHigh 18.2°C · Low 10.9°C · 49 mm rain
- Crawley in SeptemberUnited Kingdom · 30 kmHigh 18.1°C · Low 11.2°C · 50 mm rain
- Slough in SeptemberUnited Kingdom · 31 kmHigh 18.3°C · Low 11.0°C · 47 mm rain
- Hayes in SeptemberUnited Kingdom · 33 kmHigh 18.2°C · Low 11.1°C · 47 mm rain
- Maidenhead in SeptemberUnited Kingdom · 34 kmHigh 18.4°C · Low 11.0°C · 49 mm rain
- Purley in SeptemberUnited Kingdom · 34 kmHigh 18.1°C · Low 10.9°C · 51 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Guildford) is explained once on the Guildford year overview and on the Sources, method and limits page.
Woking lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.